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    13 DHTML Calendar Widget
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    45 </p>
    46 <h1 class=title align=center><br><br>DHTML Calendar Widget</h1>
    47 <p></p>
    48 <div align=center>
    49 Mihai Bazon, <tt>&lt;;</tt><br>
    50 &copy; 2002-2005, <a href=""><tt></tt></a><p>March 7, 2005<br></p>
    51 <p></p>
    52 <p>
    53 <span class=small>calendar version: 1.0 ``It is happening again''</span>
    54 </p>
    55 </div>
    56 <p></p>
    57 <p>
    58 <span class=small><code class=verbatim>$Id: reference.html 7997 2005-12-27 20:23:39Z AndreUlrich $</code></span>
    59 </p>
    60 <span class=small><blockquote>
    61 <div align=right><table><tr><td>
    63 </td></tr></table></div>
    65 </blockquote></span>
    66 <a name="node_sec_Temp_1"></a>
    67 <h1><a href="#node_toc_node_sec_Temp_1">Contents</a></h1>
    68 <p><a name="node_toc_start"></a></p>
    69 <p><b>
    70 &nbsp; &nbsp; <a name="node_toc_node_sec_1"></a><a href="#node_sec_1">1&nbsp;&nbsp;Overview</a></b><br>
    71 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_1.1"></a><a href="#node_sec_1.1">1.1&nbsp;&nbsp;How does this thing work?</a><br>
    72 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_1.2"></a><a href="#node_sec_1.2">1.2&nbsp;&nbsp;Project files</a><br>
    73 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_1.3"></a><a href="#node_sec_1.3">1.3&nbsp;&nbsp;License</a><br>
    74 </p>
    75 <p><b>
    76 &nbsp; &nbsp; <a name="node_toc_node_sec_2"></a><a href="#node_sec_2">2&nbsp;&nbsp;Quick startup</a></b><br>
    77 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_2.1"></a><a href="#node_sec_2.1">2.1&nbsp;&nbsp;Installing a popup calendar</a><br>
    78 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_2.2"></a><a href="#node_sec_2.2">2.2&nbsp;&nbsp;Installing a flat calendar</a><br>
    79 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_2.3"></a><a href="#node_sec_2.3">2.3&nbsp;&nbsp;<tt>Calendar.setup</tt> in detail</a><br>
    80 </p>
    81 <p><b>
    82 &nbsp; &nbsp; <a name="node_toc_node_sec_3"></a><a href="#node_sec_3">3&nbsp;&nbsp;Recipes</a></b><br>
    83 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_3.1"></a><a href="#node_sec_3.1">3.1&nbsp;&nbsp;Popup calendars</a><br>
    84 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_3.1.1"></a><a href="#node_sec_3.1.1">3.1.1&nbsp;&nbsp;Simple text field with calendar attached to a button</a><br>
    85 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_3.1.2"></a><a href="#node_sec_3.1.2">3.1.2&nbsp;&nbsp;Simple field with calendar attached to an image</a><br>
    86 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_3.1.3"></a><a href="#node_sec_3.1.3">3.1.3&nbsp;&nbsp;Hidden field, plain text triggers</a><br>
    87 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_3.1.4"></a><a href="#node_sec_3.1.4">3.1.4&nbsp;&nbsp;2 Linked fields, no trigger buttons</a><br>
    88 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_3.2"></a><a href="#node_sec_3.2">3.2&nbsp;&nbsp;Flat calendars</a><br>
    89 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_3.3"></a><a href="#node_sec_3.3">3.3&nbsp;&nbsp;Highlight special dates</a><br>
    90 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_3.4"></a><a href="#node_sec_3.4">3.4&nbsp;&nbsp;Select multiple dates</a><br>
    91 </p>
    92 <p><b>
    93 &nbsp; &nbsp; <a name="node_toc_node_sec_4"></a><a href="#node_sec_4">4&nbsp;&nbsp;The Calendar object overview</a></b><br>
    94 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_4.1"></a><a href="#node_sec_4.1">4.1&nbsp;&nbsp;Creating a calendar</a><br>
    95 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_4.2"></a><a href="#node_sec_4.2">4.2&nbsp;&nbsp;Order does matter ;-)</a><br>
    96 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_4.3"></a><a href="#node_sec_4.3">4.3&nbsp;&nbsp;Caching the object</a><br>
    97 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_4.4"></a><a href="#node_sec_4.4">4.4&nbsp;&nbsp;Callback functions</a><br>
    98 </p>
    99 <p><b>
   100 &nbsp; &nbsp; <a name="node_toc_node_sec_5"></a><a href="#node_sec_5">5&nbsp;&nbsp;The Calendar object API reference</a></b><br>
   101 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.1"></a><a href="#node_sec_5.1">5.1&nbsp;&nbsp;<tt>Calendar</tt> constructor</a><br>
   102 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.2"></a><a href="#node_sec_5.2">5.2&nbsp;&nbsp;Useful member variables (properties)</a><br>
   103 &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3"></a><a href="#node_sec_5.3">5.3&nbsp;&nbsp;Public methods</a><br>
   104 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.1"></a><a href="#node_sec_5.3.1">5.3.1&nbsp;&nbsp;<tt>Calendar.create</tt></a><br>
   105 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.2"></a><a href="#node_sec_5.3.2">5.3.2&nbsp;&nbsp;<tt>Calendar.callHandler</tt></a><br>
   106 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.3"></a><a href="#node_sec_5.3.3">5.3.3&nbsp;&nbsp;<tt>Calendar.callCloseHandler</tt></a><br>
   107 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.4"></a><a href="#node_sec_5.3.4">5.3.4&nbsp;&nbsp;<tt>Calendar.hide</tt></a><br>
   108 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.5"></a><a href="#node_sec_5.3.5">5.3.5&nbsp;&nbsp;<tt>Calendar.setDateFormat</tt></a><br>
   109 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.6"></a><a href="#node_sec_5.3.6">5.3.6&nbsp;&nbsp;<tt>Calendar.setTtDateFormat</tt></a><br>
   110 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.7"></a><a href="#node_sec_5.3.7">5.3.7&nbsp;&nbsp;<tt>Calendar.setDisabledHandler</tt></a><br>
   111 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.8"></a><a href="#node_sec_5.3.8">5.3.8&nbsp;&nbsp;<tt>Calendar.setDateStatusHandler</tt></a><br>
   112 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.9"></a><a href="#node_sec_5.3.9">5.3.9&nbsp;&nbsp;<tt></tt></a><br>
   113 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.10"></a><a href="#node_sec_5.3.10">5.3.10&nbsp;&nbsp;<tt>Calendar.showAt</tt></a><br>
   114 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.11"></a><a href="#node_sec_5.3.11">5.3.11&nbsp;&nbsp;<tt>Calendar.showAtElement</tt></a><br>
   115 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.12"></a><a href="#node_sec_5.3.12">5.3.12&nbsp;&nbsp;<tt>Calendar.setDate</tt></a><br>
   116 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.13"></a><a href="#node_sec_5.3.13">5.3.13&nbsp;&nbsp;<tt>Calendar.setFirstDayOfWeek</tt></a><br>
   117 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.14"></a><a href="#node_sec_5.3.14">5.3.14&nbsp;&nbsp;<tt>Calendar.parseDate</tt></a><br>
   118 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a name="node_toc_node_sec_5.3.15"></a><a href="#node_sec_5.3.15">5.3.15&nbsp;&nbsp;<tt>Calendar.setRange</tt></a><br>
   119 </p>
   120 <p><b>
   121 &nbsp; &nbsp; <a name="node_toc_node_sec_6"></a><a href="#node_sec_6">6&nbsp;&nbsp;Side effects</a></b><br>
   122 </p>
   123 <p><b>
   124 &nbsp; &nbsp; <a name="node_toc_node_sec_7"></a><a href="#node_sec_7">7&nbsp;&nbsp;Credits</a></b><br>
   125 </p>
   126 <p>
   127 </p>
   128 <p>
   129 </p>
   130 <a name="node_sec_1"></a>
   131 <h1><a href="#node_toc_node_sec_1">1&nbsp;&nbsp;Overview</a></h1>
   132 <p>The DHTML Calendar widget<a name="call_footnote_Temp_2"></a><a href="#footnote_Temp_2"><sup><small>1</small></sup></a>
   133 is an (HTML) user interface element that gives end-users a friendly way to
   134 select date and time.  It works in a web browser.  The first versions only provided
   135 support for popup calendars, while starting with version 0.9 it also supports
   136 ``flat'' display.  A ``flat'' calendar is a calendar that stays visible in the
   137 page all the time.  In this mode it could be very useful for ``blog'' pages and
   138 other pages that require the calendar to be always present.</p>
   139 <p>
   140 The calendar is compatible with most popular browsers nowadays.  While it's
   141 created using web standards and it should generally work with any compliant
   142 browser, the following browsers were found to work: Mozilla/Firefox (the
   143 development platform), Netscape&nbsp;6.0 or better, all other Gecko-based browsers,
   144 Internet Explorer&nbsp;5.0 or better <em>for Windows</em><a name="call_footnote_Temp_3"></a><a href="#footnote_Temp_3"><sup><small>2</small></sup></a>, Opera&nbsp;7<a name="call_footnote_Temp_4"></a><a href="#footnote_Temp_4"><sup><small>3</small></sup></a>, Konqueror 3.1.2 and Apple Safari for
   145 MacOSX.</p>
   146 <p>
   147 You can find the latest info and version at the calendar homepage:</p>
   148 <p>
   149 </p>
   150 <div align=center><table><tr><td>
   152 <a href=""><tt></tt></a>
   153 </td></tr></table></div>
   154 <p>
   155 </p>
   156 <a name="node_sec_1.1"></a>
   157 <h2><a href="#node_toc_node_sec_1.1">1.1&nbsp;&nbsp;How does this thing work?</a></h2>
   158 <p>DHTML is not ``another kind of HTML''.  It's merely a naming convention.  DHTML
   159 refers to the combination of HTML, CSS, JavaScript and DOM.  DOM (Document
   160 Object Model) is a set of interfaces that glues the other three together.  In
   161 other words, DOM allows dynamic modification of an HTML page through a program.
   162 JavaScript is our programming language, since that's what browsers like.  CSS
   163 is a way to make it look good ;-).  So all this soup is generically known as
   164 DHTML.</p>
   165 <p>
   166 Using DOM calls, the program dynamically creates a <tt>&lt;table&gt;</tt> element
   167 that contains a calendar for the given date and then inserts it in the document
   168 body.  Then it shows this table at a specified position.  Usually the position
   169 is related to some element in which the date needs to be displayed/entered,
   170 such as an input field.</p>
   171 <p>
   172 By assigning a certain CSS class to the table we can control the look of the
   173 calendar through an external CSS file; therefore, in order to change the
   174 colors, backgrounds, rollover effects and other stuff, you can only change a
   175 CSS file -- modification of the program itself is not necessary.</p>
   176 <p>
   177 </p>
   178 <a name="node_sec_1.2"></a>
   179 <h2><a href="#node_toc_node_sec_1.2">1.2&nbsp;&nbsp;Project files</a></h2>
   180 <p>Here's a description of the project files, excluding documentation and example
   181 files.</p>
   182 <p>
   183 </p>
   184 <ul><p>
   185 </p>
   186 <li><p>the main program file (<tt>calendar.js</tt>).  This defines all the logic
   187 behind the calendar widget.</p>
   188 <p>
   189 </p>
   190 <li><p>the CSS files (<tt>calendar-*.css</tt>).  Loading one of them is
   191 necessary in order to see the calendar as intended.</p>
   192 <p>
   193 </p>
   194 <li><p>the language definition files (<tt>lang/calendar-*.js</tt>).  They are
   195 plain JavaScript files that contain all texts that are displayed by the
   196 calendar.  Loading one of them is necessary.</p>
   197 <p>
   198 </p>
   199 <li><p>helper functions for quick setup of the calendar
   200 (<tt>calendar-setup.js</tt>).  You can do fine without it, but starting with
   201 version 0.9.3 this is the recommended way to setup a calendar.</p>
   202 <p>
   203 </p>
   204 </ul><p></p>
   205 <p>
   206 </p>
   207 <a name="node_sec_1.3"></a>
   208 <h2><a href="#node_toc_node_sec_1.3">1.3&nbsp;&nbsp;License</a></h2>
   209 <p></p>
   210 <div align=center><table><tr><td>
   212 &copy; 2002-2005,
   213 <a href=""><tt></tt></a>
   214 Author: Mihai Bazon
   215 </td></tr></table></div>
   216 <p>
   217 The calendar is released under the
   218 <a href="">GNU Lesser General Public License</a>.</p>
   219 <p>
   220 </p>
   221 <a name="node_sec_2"></a>
   222 <h1><a href="#node_toc_node_sec_2">2&nbsp;&nbsp;Quick startup</a></h1>
   223 <p></p>
   224 <p>
   225 Installing the calendar used to be quite a task until version 0.9.3.  Starting
   226 with 0.9.3 I have included the file <tt>calendar-setup.js</tt> whose goal is to
   227 assist you to setup a popup or flat calendar in minutes.  You are
   228 encouraged to modify this file and <em>not</em> calendar.js if you need
   229 extra customization, but you're on your own.</p>
   230 <p>
   231 First you have to include the needed scripts and style-sheet.  Make sure you do
   232 this in your document's <tt>&lt;head&gt;</tt> section, also make sure you put the
   233 correct paths to the scripts.</p>
   234 <p>
   235 </p>
   236 <pre class=verbatim>&lt;style type=&quot;text/css&quot;&gt;@import url(calendar-win2k-1.css);&lt;/style&gt;
   237 &lt;script type=&quot;text/javascript&quot; src=&quot;calendar.js&quot;&gt;&lt;/script&gt;
   238 &lt;script type=&quot;text/javascript&quot; src=&quot;lang/calendar-en.js&quot;&gt;&lt;/script&gt;
   239 &lt;script type=&quot;text/javascript&quot; src=&quot;calendar-setup.js&quot;&gt;&lt;/script&gt;
   240 </pre><p></p>
   241 <p>
   242 </p>
   243 <a name="node_sec_2.1"></a>
   244 <h2><a href="#node_toc_node_sec_2.1">2.1&nbsp;&nbsp;Installing a popup calendar</a></h2>
   245 <p></p>
   246 <p>
   247 Now suppose you have the following HTML:</p>
   248 <p>
   249 </p>
   250 <pre class=verbatim>&lt;form ...&gt;
   251   &lt;input type=&quot;text&quot; id=&quot;data&quot; name=&quot;data&quot; /&gt;
   252   &lt;button id=&quot;trigger&quot;&gt;...&lt;/button&gt;
   253 &lt;/form&gt;
   254 </pre><p></p>
   255 <p>
   256 You want the button to popup a calendar widget when clicked?  Just
   257 insert the following code immediately <em>after</em> the HTML form:</p>
   258 <p>
   259 </p>
   260 <pre class=verbatim>&lt;script type=&quot;text/javascript&quot;&gt;
   261   Calendar.setup(
   262     {
   263       inputField  : &quot;data&quot;,         // ID of the input field
   264       ifFormat    : &quot;%m %d, %Y&quot;,    // the date format
   265       button      : &quot;trigger&quot;       // ID of the button
   266     }
   267   );
   268 &lt;/script&gt;
   269 </pre><p></p>
   270 <p>
   271 The <tt>Calendar.setup</tt> function, defined in <tt>calendar-setup.js</tt>
   272 takes care of ``patching'' the button to display a calendar when clicked.  The
   273 calendar is by default in single-click mode and linked with the given input
   274 field, so that when the end-user selects a date it will update the input field
   275 with the date in the given format and close the calendar.  If you are a
   276 long-term user of the calendar you probably remember that for doing this you
   277 needed to write a couple functions and add an ``onclick'' handler for the
   278 button by hand.</p>
   279 <p>
   280 By looking at the example above we can see that the function
   281 <tt>Calendar.setup</tt> receives only one parameter: a JavaScript object.
   282 Further, that object can have lots of properties that tell to the setup
   283 function how would we like to have the calendar.  For instance, if we would
   284 like a calendar that closes at double-click instead of single-click we would
   285 also include the following: <tt>singleClick:false</tt>.</p>
   286 <p>
   287 For a list of all supported parameters please see the section
   288 <a href="#node_sec_2.3">2.3</a>.</p>
   289 <p>
   290 </p>
   291 <a name="node_sec_2.2"></a>
   292 <h2><a href="#node_toc_node_sec_2.2">2.2&nbsp;&nbsp;Installing a flat calendar</a></h2>
   293 <p></p>
   294 <p>
   295 Here's how to configure a flat calendar, using the same <tt>Calendar.setup</tt>
   296 function.  First, you should have an empty element with an ID.  This element
   297 will act as a container for the calendar.  It can be any block-level element,
   298 such as DIV, TABLE, etc.  We will use a DIV in this example.</p>
   299 <p>
   300 </p>
   301 <pre class=verbatim>&lt;div id=&quot;calendar-container&quot;&gt;&lt;/div&gt;
   302 </pre><p></p>
   303 <p>
   304 Then there is the JavaScript code that sets up the calendar into the
   305 ``calendar-container'' DIV.  The code can occur anywhere in HTML
   306 <em>after</em> the DIV element.</p>
   307 <p>
   308 </p>
   309 <pre class=verbatim>&lt;script type=&quot;text/javascript&quot;&gt;
   310   function dateChanged(calendar) {
   311     // Beware that this function is called even if the end-user only
   312     // changed the month/year.  In order to determine if a date was
   313     // clicked you can use the dateClicked property of the calendar:
   314     if (calendar.dateClicked) {
   315       // OK, a date was clicked, redirect to /yyyy/mm/dd/index.php
   316       var y =;
   317       var m =;     // integer, 0..11
   318       var d =;      // integer, 1..31
   319       // redirect...
   320       window.location = &quot;/&quot; + y + &quot;/&quot; + m + &quot;/&quot; + d + &quot;/index.php&quot;;
   321     }
   322   };
   324   Calendar.setup(
   325     {
   326       flat         : &quot;calendar-container&quot;, // ID of the parent element
   327       flatCallback : dateChanged           // our callback function
   328     }
   329   );
   330 &lt;/script&gt;
   331 </pre><p></p>
   332 <p>
   333 </p>
   334 <a name="node_sec_2.3"></a>
   335 <h2><a href="#node_toc_node_sec_2.3">2.3&nbsp;&nbsp;<tt>Calendar.setup</tt> in detail</a></h2>
   336 <p></p>
   337 <p>
   338 Following there is the complete list of properties interpreted by
   339 Calendar.setup.  All of them have default values, so you can pass only those
   340 which you would like to customize.  Anyway, you <em>must</em> pass at least one
   341 of <tt>inputField</tt>, <tt>displayArea</tt> or <tt>button</tt>, for a popup
   342 calendar, or <tt>flat</tt> for a flat calendar.  Otherwise you will get a
   343 warning message saying that there's nothing to setup.</p>
   344 <p>
   345 </p>
   346 <span class=small><table border=0><tr><td valign=top ><b>property</b> </td><td valign=top ><b>type</b> </td><td valign=top ><b>description</b> </td><td valign=top ><b>default</b>
   347 </td></tr>
   348 <tr><td valign=top ><tt>inputField</tt>
   349 </td><td valign=top >string </td><td valign=top >The ID of your input field.
   350 </td><td valign=top >null
   351 </td></tr>
   352 <tr><td valign=top ><tt>displayArea</tt>
   353 </td><td valign=top >string </td><td valign=top >This is the ID of a &lt;span&gt;, &lt;div&gt;, or any other element that you would like to use to display the current date. This is generally useful only if the input field is hidden, as an area to display the date.
   354 </td><td valign=top >null
   355 </td></tr>
   356 <tr><td valign=top ><tt>button</tt>
   357 </td><td valign=top >string </td><td valign=top >The ID of the calendar ``trigger''. This is an element (ordinarily a button or an image) that will dispatch a certain event (usually ``click'') to the function that creates and displays the calendar.
   358 </td><td valign=top >null
   359 </td></tr>
   360 <tr><td valign=top ><tt>eventName</tt>
   361 </td><td valign=top >string </td><td valign=top >The name of the event that will trigger the calendar. The name should be without the ``on'' prefix, such as ``click'' instead of ``onclick''. Virtually all users will want to let this have the default value (``click''). Anyway, it could be useful if, say, you want the calendar to appear when the input field is focused and have no trigger button (in this case use ``focus'' as the event name).
   362 </td><td valign=top >``click''
   363 </td></tr>
   364 <tr><td valign=top ><tt>ifFormat</tt>
   365 </td><td valign=top >string </td><td valign=top >The format string that will be used to enter the date in the input field. This format will be honored even if the input field is hidden.
   366 </td><td valign=top >``%Y/%m/%d''
   367 </td></tr>
   368 <tr><td valign=top ><tt>daFormat</tt>
   369 </td><td valign=top >string </td><td valign=top >Format of the date displayed in the displayArea (if specified).
   370 </td><td valign=top >``%Y/%m/%d''
   371 </td></tr>
   372 <tr><td valign=top ><tt>singleClick</tt>
   373 </td><td valign=top >boolean </td><td valign=top >Wether the calendar is in ``single-click mode'' or ``double-click mode''. If true (the default) the calendar will be created in single-click mode.
   374 </td><td valign=top >true
   375 </td></tr>
   376 <tr><td valign=top ><tt>disableFunc</tt>
   377 </td><td valign=top >function </td><td valign=top >A function that receives a JS Date object.  It should return
   378 <tt>true</tt> if that date has to be disabled, <tt>false</tt> otherwise.
   379 <font color="red">DEPRECATED (see below).</font>
   380 </td><td valign=top >null
   381 </td></tr>
   382 <tr><td valign=top ><tt>dateStatusFunc</tt>
   383 </td><td valign=top >function </td><td valign=top >A function that receives a JS Date object and returns a boolean
   384 or a string.  This function allows one to set a certain CSS class to some
   385 date, therefore making it look different.  If it returns <tt>true</tt> then
   386 the date will be disabled.  If it returns <tt>false</tt> nothing special
   387 happens with the given date.  If it returns a string then that will be taken
   388 as a CSS class and appended to the date element.  If this string is
   389 ``disabled'' then the date is also disabled (therefore is like returning
   390 <tt>true</tt>).  For more information please also refer to section
   391 <a href="#node_sec_5.3.8">5.3.8</a>.
   392 </td><td valign=top >null
   393 </td></tr>
   394 <tr><td valign=top ><tt>firstDay</tt>
   395 </td><td valign=top >integer </td><td valign=top >Specifies which day is to be displayed as the first day of
   396 week.  Possible values are 0 to 6; 0 means Sunday, 1 means Monday, ..., 6
   397 means Saturday.  The end user can easily change this too, by clicking on the
   398 day name in the calendar header.
   399 </td><td valign=top >0
   400 </td></tr>
   401 <tr><td valign=top ><tt>weekNumbers</tt>
   402 </td><td valign=top >boolean </td><td valign=top >If ``true'' then the calendar will display week numbers.
   403 </td><td valign=top >true
   404 </td></tr>
   405 <tr><td valign=top ><tt>align</tt>
   406 </td><td valign=top >string </td><td valign=top >Alignment of the calendar, relative to the reference element. The
   407 reference element is dynamically chosen like this: if a displayArea is
   408 specified then it will be the reference element. Otherwise, the input field
   409 is the reference element.  For the meaning of the alignment characters
   410 please section <a href="#node_sec_5.3.11">5.3.11</a>.
   411 </td><td valign=top >``Bl''
   412 </td></tr>
   413 <tr><td valign=top ><tt>range</tt>
   414 </td><td valign=top >array </td><td valign=top >An array having exactly 2 elements, integers. (!) The first [0] element is the minimum year that is available, and the second [1] element is the maximum year that the calendar will allow.
   415 </td><td valign=top >[1900, 2999]
   416 </td></tr>
   417 <tr><td valign=top ><tt>flat</tt>
   418 </td><td valign=top >string </td><td valign=top >If you want a flat calendar, pass the ID of the parent object in
   419 this property.  If not, pass <tt>null</tt> here (or nothing at all as
   420 <tt>null</tt> is the default value).
   421 </td><td valign=top >null
   422 </td></tr>
   423 <tr><td valign=top ><tt>flatCallback</tt>
   424 </td><td valign=top >function </td><td valign=top >You should provide this function if the calendar is flat.  It
   425 will be called when the date in the calendar is changed with a reference to
   426 the calendar object.  See section <a href="#node_sec_2.2">2.2</a> for an example
   427 of how to setup a flat calendar.
   428 </td><td valign=top >null
   429 </td></tr>
   430 <tr><td valign=top ><tt>onSelect</tt>
   431 </td><td valign=top >function </td><td valign=top >If you provide a function handler here then you have to manage
   432 the ``click-on-date'' event by yourself.  Look in the calendar-setup.js and
   433 take as an example the onSelect handler that you can see there.
   434 </td><td valign=top >null
   435 </td></tr>
   436 <tr><td valign=top ><tt>onClose</tt>
   437 </td><td valign=top >function </td><td valign=top >This handler will be called when the calendar needs to close.
   438 You don't need to provide one, but if you do it's your responsibility to
   439 hide/destroy the calendar.  You're on your own.  Check the calendar-setup.js
   440 file for an example.
   441 </td><td valign=top >null
   442 </td></tr>
   443 <tr><td valign=top ><tt>onUpdate</tt>
   444 </td><td valign=top >function </td><td valign=top >If you supply a function handler here, it will be called right
   445 after the target field is updated with a new date.  You can use this to
   446 chain 2 calendars, for instance to setup a default date in the second just
   447 after a date was selected in the first.
   448 </td><td valign=top >null
   449 </td></tr>
   450 <tr><td valign=top ><tt>date</tt>
   451 </td><td valign=top >date </td><td valign=top >This allows you to setup an initial date where the calendar will be
   452 positioned to.  If absent then the calendar will open to the today date.
   453 </td><td valign=top >null
   454 </td></tr>
   455 <tr><td valign=top ><tt>showsTime</tt>
   456 </td><td valign=top >boolean </td><td valign=top >If this is set to <tt>true</tt> then the calendar will also
   457 allow time selection.
   458 </td><td valign=top >false
   459 </td></tr>
   460 <tr><td valign=top ><tt>timeFormat</tt>
   461 </td><td valign=top >string </td><td valign=top >Set this to ``12'' or ``24'' to configure the way that the
   462 calendar will display time.
   463 </td><td valign=top >``24''
   464 </td></tr>
   465 <tr><td valign=top ><tt>electric</tt>
   466 </td><td valign=top >boolean </td><td valign=top >Set this to ``false'' if you want the calendar to update the
   467 field only when closed (by default it updates the field at each date change,
   468 even if the calendar is not closed) </td><td valign=top >true
   469 </td></tr>
   470 <tr><td valign=top ><tt>position</tt>
   471 </td><td valign=top >array </td><td valign=top >Specifies the [x, y] position, relative to page's top-left corner,
   472 where the calendar will be displayed.  If not passed then the position will
   473 be computed based on the ``align'' parameter.  Defaults to ``null'' (not
   474 used). </td><td valign=top >null
   475 </td></tr>
   476 <tr><td valign=top ><tt>cache</tt>
   477 </td><td valign=top >boolean </td><td valign=top >Set this to ``true'' if you want to cache the calendar object.
   478 This means that a single calendar object will be used for all fields that
   479 require a popup calendar </td><td valign=top >false
   480 </td></tr>
   481 <tr><td valign=top ><tt>showOthers</tt>
   482 </td><td valign=top >boolean </td><td valign=top >If set to ``true'' then days belonging to months overlapping
   483 with the currently displayed month will also be displayed in the calendar
   484 (but in a ``faded-out'' color) </td><td valign=top >false
   486 </td></tr></table>
   488 </span><p>
   489 </p>
   490 <a name="node_sec_3"></a>
   491 <h1><a href="#node_toc_node_sec_3">3&nbsp;&nbsp;Recipes</a></h1>
   492 <p>This section presents some common ways to setup a calendar using the
   493 <tt>Calendar.setup</tt> function detailed in the previous section.</p>
   494 <p>
   495 We don't discuss here about loading the JS or CSS code -- so make sure you
   496 add the proper &lt;script&gt; and &lt;style&gt; or &lt;link&gt; elements in your
   497 HTML code.  Also, when we present input fields, please note that they should
   498 be embedded in some form in order for data to be actually sent to server; we
   499 don't discuss these things here because they are not related to our
   500 calendar.</p>
   501 <p>
   502 </p>
   503 <a name="node_sec_3.1"></a>
   504 <h2><a href="#node_toc_node_sec_3.1">3.1&nbsp;&nbsp;Popup calendars</a></h2>
   505 <p>These samples can be found in the file “<tt>simple-1.html</tt>” from the
   506 calendar package.</p>
   507 <p>
   508 </p>
   509 <a name="node_sec_3.1.1"></a>
   510 <h3><a href="#node_toc_node_sec_3.1.1">3.1.1&nbsp;&nbsp;Simple text field with calendar attached to a button</a></h3>
   511 <p></p>
   512 <p>
   513 This piece of code will create a calendar for a simple input field with a
   514 button that will open the calendar when clicked.</p>
   515 <p>
   516 </p>
   517 <pre class=verbatim>&lt;input type=&quot;text&quot; name=&quot;date&quot; id=&quot;f_date_b&quot;
   518        /&gt;&lt;button type=&quot;reset&quot; id=&quot;f_trigger_b&quot;
   519        &gt;...&lt;/button&gt;
   520 &lt;script type=&quot;text/javascript&quot;&gt;
   521     Calendar.setup({
   522         inputField     :    &quot;f_date_b&quot;,           //*
   523         ifFormat       :    &quot;%m/%d/%Y %I:%M %p&quot;,
   524         showsTime      :    true,
   525         button         :    &quot;f_trigger_b&quot;,        //*
   526         step           :    1
   527     });
   528 &lt;/script&gt;
   529 </pre><p></p>
   530 <p>
   531 Note that this code does more actually; the only <em>required</em> fields are
   532 those marked with “//*” -- that is, the ID of the input field and the ID of
   533 the button need to be passed to <tt>Calendar.setup</tt> in order for the
   534 calendar to be properly assigned to this input field.  As one can easily
   535 guess from the argument names, the other arguments configure a certain date
   536 format, instruct the calendar to also include a time selector and display
   537 every year in the drop-down boxes (the “step” parameter) -- instead of showing
   538 every other year as the default calendar does.</p>
   539 <p>
   540 </p>
   541 <a name="node_sec_3.1.2"></a>
   542 <h3><a href="#node_toc_node_sec_3.1.2">3.1.2&nbsp;&nbsp;Simple field with calendar attached to an image</a></h3>
   543 <p>Same as the above, but the element that triggers the calendar is this time
   544 an image, not a button.</p>
   545 <p>
   546 </p>
   547 <pre class=verbatim>&lt;input type=&quot;text&quot; name=&quot;date&quot; id=&quot;f_date_c&quot; readonly=&quot;1&quot; /&gt;
   548 &lt;img src=&quot;img.gif&quot; id=&quot;f_trigger_c&quot;
   549      style=&quot;cursor: pointer; border: 1px solid red;&quot;
   550      title=&quot;Date selector&quot;
   551      onmouseover=&quot;'red';&quot;
   552      onmouseout=&quot;''&quot; /&gt;
   553 &lt;script type=&quot;text/javascript&quot;&gt;
   554     Calendar.setup({
   555         inputField     :    &quot;f_date_c&quot;,
   556         ifFormat       :    &quot;%B %e, %Y&quot;,
   557         button         :    &quot;f_trigger_c&quot;,
   558         align          :    &quot;Tl&quot;,
   559         singleClick    :    false
   560     });
   561 &lt;/script&gt;
   562 </pre><p></p>
   563 <p>
   564 Note that the same 2 parameters are required as in the previous case; the
   565 difference is that the 'button' parameter now gets the ID of the image
   566 instead of the ID of the button.  But the event is the same: at 'onclick' on
   567 the element that is passed as 'button', the calendar will be shown.</p>
   568 <p>
   569 The above code additionally sets an alignment mode -- the parameters are
   570 described in <a href="#node_sec_5.3.11">5.3.11</a>.</p>
   571 <p>
   572 </p>
   573 <a name="node_sec_3.1.3"></a>
   574 <h3><a href="#node_toc_node_sec_3.1.3">3.1.3&nbsp;&nbsp;Hidden field, plain text triggers</a></h3>
   575 <p>Sometimes, to assure that the date is well formatted, you might want not to
   576 allow the end user to write a date manually.  This can easily be achieved
   577 with an input field by setting its <tt>readonly</tt> attribute, which is
   578 defined by the HTML4 standard; however, here's an even nicer approach: our
   579 calendar widget allows you to use a hidden field as the way to pass data to
   580 server, and a “display area” to show the end user the selected date.  The
   581 “display area” can be any HTML element, such as a DIV or a SPAN or
   582 whatever -- we will use a SPAN in our sample.</p>
   583 <p>
   584 </p>
   585 <pre class=verbatim>&lt;input type=&quot;hidden&quot; name=&quot;date&quot; id=&quot;f_date_d&quot; /&gt;
   587 &lt;p&gt;Your birthday:
   588    &lt;span style=&quot;background-color: #ff8; cursor: default;&quot;
   589          onmouseover=&quot;'#ff0';&quot;
   590          onmouseout=&quot;'#ff8';&quot;
   591          id=&quot;show_d&quot;
   592    &gt;Click to open date selector&lt;/span&gt;.&lt;/p&gt;
   594 &lt;script type=&quot;text/javascript&quot;&gt;
   595     Calendar.setup({
   596         inputField     :    &quot;f_date_d&quot;,
   597         ifFormat       :    &quot;%Y/%d/%m&quot;,
   598         displayArea    :    &quot;show_d&quot;,
   599         daFormat       :    &quot;%A, %B %d, %Y&quot;,
   600     });
   601 &lt;/script&gt;
   602 </pre><p></p>
   603 <p>
   604 The above code will configure a calendar attached to the hidden field and to
   605 the SPAN having the id=“show_d”.  When the SPAN element is clicked, the
   606 calendar opens and allows the end user to chose a date.  When the date is
   607 chosen, the input field will be updated with the value in the format
   608 “<tt>%Y/%d/%m</tt>”, and the SPAN element will display the date in a
   609 friendlier format (defined by “<tt>daFormat</tt>”).</p>
   610 <p>
   611 Beware that using this approach will make your page unfunctional in browsers
   612 that do not support JavaScript or our calendar.</p>
   613 <p>
   614 </p>
   615 <a name="node_sec_3.1.4"></a>
   616 <h3><a href="#node_toc_node_sec_3.1.4">3.1.4&nbsp;&nbsp;2 Linked fields, no trigger buttons</a></h3>
   617 <p>Supposing you want to create 2 fields that hold an interval of exactly one
   618 week.  The first is the starting date, and the second is the ending date.
   619 You want the fields to be automatically updated when some date is clicked in
   620 one or the other, in order to keep exactly one week difference between them.</p>
   621 <p>
   622 </p>
   623 <pre class=verbatim>&lt;input type=&quot;text&quot; name=&quot;date&quot; id=&quot;f_date_a&quot; /&gt;
   624 &lt;input type=&quot;text&quot; name=&quot;date&quot; id=&quot;f_calcdate&quot; /&gt;
   626 &lt;script type=&quot;text/javascript&quot;&gt;
   627     function catcalc(cal) {
   628         var date =;
   629         var time = date.getTime()
   630         // use the _other_ field
   631         var field = document.getElementById(&quot;f_calcdate&quot;);
   632         if (field == cal.params.inputField) {
   633             field = document.getElementById(&quot;f_date_a&quot;);
   634             time -= Date.WEEK; // substract one week
   635         } else {
   636             time += Date.WEEK; // add one week
   637         }
   638         var date2 = new Date(time);
   639         field.value = date2.print(&quot;%Y-%m-%d %H:%M&quot;);
   640     }
   641     Calendar.setup({
   642         inputField     :    &quot;f_date_a&quot;,
   643         ifFormat       :    &quot;%Y-%m-%d %H:%M&quot;,
   644         showsTime      :    true,
   645         timeFormat     :    &quot;24&quot;,
   646         onUpdate       :    catcalc
   647     });
   648     Calendar.setup({
   649         inputField     :    &quot;f_calcdate&quot;,
   650         ifFormat       :    &quot;%Y-%m-%d %H:%M&quot;,
   651         showsTime      :    true,
   652         timeFormat     :    &quot;24&quot;,
   653         onUpdate       :    catcalc
   654     });
   655 &lt;/script&gt;
   656 </pre><p></p>
   657 <p>
   658 The above code will configure 2 input fields with calendars attached, as
   659 usual.  The first thing to note is that there's no trigger button -- in such
   660 case, the calendar will popup when one clicks into the input field.  Using
   661 the <tt>onUpdate</tt> parameter, we pass a reference to a function of ours
   662 that will get called after a date was selected.  In that function we
   663 determine what field was updated and we compute the date in the other input
   664 field such that it keeps a one week difference between the two.  Enjoy! :-)</p>
   665 <p>
   666 </p>
   667 <a name="node_sec_3.2"></a>
   668 <h2><a href="#node_toc_node_sec_3.2">3.2&nbsp;&nbsp;Flat calendars</a></h2>
   669 <p>This sample can be found in “<tt>simple-2.html</tt>”.  It will configure a
   670 flat calendar that is always displayed in the page, in the DIV having the
   671 id=“calendar-container”.  When a date is clicked our function hander gets
   672 called (<tt>dateChanged</tt>) and it will compute an URL to jump to based on
   673 the selected date, then use <tt>window.location</tt> to visit the new link.</p>
   674 <p>
   675 </p>
   676 <pre class=verbatim>&lt;div style=&quot;float: right; margin-left: 1em; margin-bottom: 1em;&quot;
   677 id=&quot;calendar-container&quot;&gt;&lt;/div&gt;
   679 &lt;script type=&quot;text/javascript&quot;&gt;
   680   function dateChanged(calendar) {
   681     // Beware that this function is called even if the end-user only
   682     // changed the month/year.  In order to determine if a date was
   683     // clicked you can use the dateClicked property of the calendar:
   684     if (calendar.dateClicked) {
   685       // OK, a date was clicked, redirect to /yyyy/mm/dd/index.php
   686       var y =;
   687       var m =;     // integer, 0..11
   688       var d =;      // integer, 1..31
   689       // redirect...
   690       window.location = &quot;/&quot; + y + &quot;/&quot; + m + &quot;/&quot; + d + &quot;/index.php&quot;;
   691     }
   692   };
   694   Calendar.setup(
   695     {
   696       flat         : &quot;calendar-container&quot;, // ID of the parent element
   697       flatCallback : dateChanged           // our callback function
   698     }
   699   );
   700 &lt;/script&gt;
   701 </pre><p></p>
   702 <p>
   703 </p>
   704 <a name="node_sec_3.3"></a>
   705 <h2><a href="#node_toc_node_sec_3.3">3.3&nbsp;&nbsp;Highlight special dates</a></h2>
   706 <p>So you want to display certain dates in a different color, or with bold
   707 font, or whatever, right?  Well, no problem -- our calendar can do this as
   708 well.  It doesn't matter if it's a flat or popup calendar -- we'll use a flat
   709 one for this sample.  The idea, however, is that you need to have the dates
   710 in an array or a JavaScript object -- whatever is suitable for your way of
   711 thinking -- and use it from a function that returns a value, telling the
   712 calendar what kind of date is the passed one.</p>
   713 <p>
   714 Too much talking, here's the code ;-)</p>
   715 <p>
   716 </p>
   717 <pre class=verbatim>&lt;!-- this goes into the &lt;head&gt; tag --&gt;
   718 &lt;style type=&quot;text/css&quot;&gt;
   719   .special { background-color: #000; color: #fff; }
   720 &lt;/style&gt;
   722 &lt;!-- and the rest inside the &lt;body&gt; --&gt;
   723 &lt;div style=&quot;float: right; margin-left: 1em; margin-bottom: 1em;&quot;
   724 id=&quot;calendar-container&quot;&gt;&lt;/div&gt;
   726 &lt;script type=&quot;text/javascript&quot;&gt;
   727   var SPECIAL_DAYS = {
   728     0 : [ 13, 24 ],		// special days in January
   729     2 : [ 1, 6, 8, 12, 18 ],	// special days in March
   730     8 : [ 21, 11 ]		// special days in September
   731   };
   733   function dateIsSpecial(year, month, day) {
   734     var m = SPECIAL_DAYS[month];
   735     if (!m) return false;
   736     for (var i in m) if (m[i] == day) return true;
   737     return false;
   738   };
   740   function dateChanged(calendar) {
   741     // Beware that this function is called even if the end-user only
   742     // changed the month/year.  In order to determine if a date was
   743     // clicked you can use the dateClicked property of the calendar:
   744     if (calendar.dateClicked) {
   745       // OK, a date was clicked, redirect to /yyyy/mm/dd/index.php
   746       var y =;
   747       var m =;     // integer, 0..11
   748       var d =;      // integer, 1..31
   749       // redirect...
   750       window.location = &quot;/&quot; + y + &quot;/&quot; + m + &quot;/&quot; + d + &quot;/index.php&quot;;
   751     }
   752   };
   754   function ourDateStatusFunc(date, y, m, d) {
   755     if (dateIsSpecial(y, m, d))
   756       return &quot;special&quot;;
   757     else
   758       return false; // other dates are enabled
   759       // return true if you want to disable other dates
   760   };
   762   Calendar.setup(
   763     {
   764       flat         : &quot;calendar-container&quot;, // ID of the parent element
   765       flatCallback : dateChanged,          // our callback function
   766       dateStatusFunc : ourDateStatusFunc
   767     }
   768   );
   769 &lt;/script&gt;
   770 </pre><p></p>
   771 <p>
   772 So the above code creates a normal flat calendar, like in the previous
   773 sample.  We hook into it with the function “<tt>ourDateStatusFunc</tt>”,
   774 which receives a date object as the first argument, and also the year,
   775 month, date as the next 3 arguments (normally, you can extract year, month,
   776 date from the first parameter too, but we pass them separately for
   777 convenience, as it's very likely that they are going to be used in this
   778 function).</p>
   779 <p>
   780 So, this function receives a date.  It can return <tt>false</tt> if you want
   781 no special action to be taken on that date, <tt>true</tt> if that date
   782 should be disabled (unselectable), or a string if you want to assign a
   783 special CSS class to that date.  We return “special” for the dates that we
   784 want to highlight -- and note that we defined a “special” look for them in
   785 the CSS section.</p>
   786 <p>
   787 I used a simple approach here to define what dates are special.  There's a
   788 JavaScript object (the SPECIAL_DAYS global variable) which holds an array
   789 of dates for each month.  Month numbers start at zero (January).  Months
   790 that don't contain special dates can be absent from this object.  Note that
   791 the way to implement this is completely separated from the calendar
   792 code -- therefore, feel free to use your imagination if you have better
   793 ideas. :-)</p>
   794 <p>
   795 </p>
   796 <a name="node_sec_3.4"></a>
   797 <h2><a href="#node_toc_node_sec_3.4">3.4&nbsp;&nbsp;Select multiple dates</a></h2>
   798 <p>Starting version 1.0, the calendar is able to handle multiple dates
   799 selection.  You just need to pass the “<tt>multiple</tt>” parameter to
   800 <tt>Calendar.setup</tt> and add some special code that interprets the
   801 selection once the calendar is closed.</p>
   802 <p>
   803 </p>
   804 <pre class=verbatim>&lt;a id=&quot;trigger&quot; href=&quot;#&quot;&gt;[open calendar...]&lt;/a&gt;
   805 &lt;div id=&quot;output&quot;&gt;&lt;/div&gt;
   806 &lt;script type=&quot;text/javascript&quot;&gt;//&lt;![CDATA[
   807     // the default multiple dates selected,
   808     // first time the calendar is displayed
   809     var MA = [];
   811     function closed(cal) {
   813       // here we'll write the output; this is only for example.  You
   814       // will normally fill an input field or something with the dates.
   815       var el = document.getElementById(&quot;output&quot;);
   817       // reset initial content.
   818       el.innerHTML = &quot;&quot;;
   820       // Reset the &quot;MA&quot;, in case one triggers the calendar again.
   821       // CAREFUL!  You don't want to do &quot;MA = [];&quot;.  We need to modify
   822       // the value of the current array, instead of creating a new one.
   823       // Calendar.setup is called only once! :-)  So be careful.
   824       MA.length = 0;
   826       // walk the calendar's multiple dates selection hash
   827       for (var i in cal.multiple) {
   828         var d = cal.multiple[i];
   829         // sometimes the date is not actually selected,
   830         // so let's check
   831         if (d) {
   832           // OK, selected.  Fill an input field or something.
   833           el.innerHTML += d.print(&quot;%A, %Y %B %d&quot;) + &quot;&lt;br /&gt;&quot;;
   834           // and push it in the &quot;MA&quot;, in case one triggers the calendar again.
   835           MA[MA.length] = d;
   836         }
   837       }
   838       cal.hide();
   839       return true;
   840     };
   842     Calendar.setup({
   843       align      : &quot;BR&quot;,
   844       showOthers : true,
   845       multiple   : MA, // pass the initial or computed array of multiple dates
   846       onClose    : closed,
   847       button     : &quot;trigger&quot;
   848     });
   849 //]]&gt;&lt;/script&gt;
   850 </pre><p></p>
   851 <p>
   852 The above code creates a popup calendar and passes to it an array of dates,
   853 which is initially empty, in the “multiple” argument.  When the calendar is
   854 closed it will call our “<tt>closed</tt>” function handler; in this handler
   855 we determine what dates were actually selected, inspecting the
   856 “<tt>cal.multiple</tt>” property, we display them in a DIV element right
   857 next to the &lt;a&gt; element that opens the calendar, and we reinitialize the
   858 global array of selected dates (which will be used if the end user opens the
   859 calendar again).  I guess the code speaks for itself, right? :-)</p>
   860 <p>
   861 </p>
   862 <a name="node_sec_4"></a>
   863 <h1><a href="#node_toc_node_sec_4">4&nbsp;&nbsp;The Calendar object overview</a></h1>
   864 <p></p>
   865 <p>
   866 Basically you should be able to setup the calendar with the function presented
   867 in the previous section.  However, if for some reason <tt>Calendar.setup</tt>
   868 doesn't provide all the functionality that you need and you want to tweak into
   869 the process of creating and configuring the calendar ``by hand'', then this
   870 section is the way to go.</p>
   871 <p>
   872 The file <tt>calendar.js</tt> implements the functionality of the calendar.
   873 All (well, almost all) functions and variables are embedded in the JavaScript
   874 object ``Calendar''.</p>
   875 <p>
   876 You can instantiate a <tt>Calendar</tt> object by calling the constructor, like
   877 this: <tt>var cal = new Calendar(<tt>...</tt>)</tt>.  We will discuss the parameters
   878 later.  After creating the object, the variable <tt>cal</tt> will contain a
   879 reference to it.  You can use this reference to access further options of the
   880 calendar, for instance:</p>
   881 <p>
   882 </p>
   883 <pre class=verbatim>cal.weekNumbers = false; // do not display week numbers
   884 cal.showsTime = true;    // include a time selector
   885 cal.setDateFormat(&quot;%Y.%m.%d %H:%M&quot;); // set this format: 2003.12.31 23:59
   886 cal.setDisabledHandler(function(date, year, month, day) {
   887   // verify date and return true if it has to be disabled
   888   // ``date'' is a JS Date object, but if you only need the
   889   // year, month and/or day you can get them separately as
   890   // next 3 parameters, as you can see in the declaration
   891   if (year == 2004) {
   892     // disable all dates from 2004
   893     return true;
   894   }
   895   return false;
   896 });
   897 </pre><p></p>
   898 <p>
   899 etc.  Prior to version
   900 0.9.3 this was the only way to configure it.  The <tt>Calendar.setup</tt>
   901 function, documented in section <a href="#node_sec_2">2</a>, basically does the same
   902 things (actually more) in order to setup the calendar, based on the parameters
   903 that you provided.</p>
   904 <p>
   905 </p>
   906 <a name="node_sec_4.1"></a>
   907 <h2><a href="#node_toc_node_sec_4.1">4.1&nbsp;&nbsp;Creating a calendar</a></h2>
   908 <p>The calendar is created by following some steps (even the function
   909 <tt>Calendar.setup</tt>, described in section <a href="#node_sec_2">2</a>, does the
   910 same).  While you can skip optional (marked ``opt'') steps if you're happy with
   911 the defaults, please respect the order below.</p>
   912 <p>
   913 </p>
   914 <ol><p>
   915 </p>
   916 <li><p><em>Instantiate</em> a <tt>Calendar</tt> object.  Details about this in
   917 section <a href="#node_sec_5.1">5.1</a>.</p>
   918 <p>
   919 </p>
   920 <li><p><b>opt</b>&nbsp;&nbsp; Set the <tt>weekNumbers</tt> property to <tt>false</tt> if you don't want
   921 the calendar to display week numbers.</p>
   922 <p>
   923 </p>
   924 <li><p><b>opt</b>&nbsp;&nbsp; Set the <tt>showsTime</tt> property to <tt>true</tt> if you
   925 want the calendar to also provide a time selector.</p>
   926 <p>
   927 </p>
   928 <li><p><b>opt</b>&nbsp;&nbsp; Set the <tt>time24</tt> property to <tt>false</tt> if you want
   929 the time selector to be in 12-hour format.  Default is 24-hour format.  This
   930 property only has effect if you also set <tt>showsTime</tt> to
   931 <tt>true</tt>.</p>
   932 <p>
   933 </p>
   934 <li><p><b>opt</b>&nbsp;&nbsp; Set the range of years available for selection (see section
   935 <a href="#node_sec_5.3.15">5.3.15</a>).  The default range is [1970..2050].</p>
   936 <p>
   937 </p>
   938 <li><p><b>opt</b>&nbsp;&nbsp; Set the <tt>getDateStatus</tt> property.  You should pass
   939 here a function that receives a JavaScript <tt>Date</tt> object and returns
   940 <tt>true</tt> if the given date should be disabled, false otherwise (details in
   941 section <a href="#node_sec_5.3.7">5.3.7</a>).</p>
   942 <p>
   943 </p>
   944 <li><p><b>opt</b>&nbsp;&nbsp; Set a date format.  Your handler function, passed to the
   945 calendar constructor, will be called when a date is selected with a reference
   946 to the calendar and a date string in this format.</p>
   947 <p>
   948 </p>
   949 <li><p><em>Create</em> the HTML elements related to the calendar.  This step
   950 practically puts the calendar in your HTML page.  You simply call
   951 <tt>Calendar.create()</tt>.  You can give an optional parameter if you wanna
   952 create a flat calendar (details in section <a href="#node_sec_5.3.1">5.3.1</a>).</p>
   953 <p>
   954 </p>
   955 <li><p><b>opt</b>&nbsp;&nbsp; Initialize the calendar to a certain date, for instance from
   956 the input field.</p>
   957 <p>
   958 </p>
   959 <li><p>Show the calendar (details in section <a href="#node_sec_5.3.9">5.3.9</a>).</p>
   960 <p>
   961 </p>
   962 </ol><p></p>
   963 <p>
   964 </p>
   965 <a name="node_sec_4.2"></a>
   966 <h2><a href="#node_toc_node_sec_4.2">4.2&nbsp;&nbsp;Order does matter ;-)</a></h2>
   967 <p>As you could see in the previous section, there are more steps to be followed
   968 in order to setup the calendar.  This happens because there are two different
   969 things that need to be accomplished: first there is the JavaScript object, that
   970 is created with <tt>new Calendar(<tt>...</tt>)</tt>.  Secondly there are the HTML
   971 elements that actually lets you see and manipulate the calendar.</p>
   972 <p>
   973 </p>
   974 <span class=small>[ Those that did UI<a name="call_footnote_Temp_5"></a><a href="#footnote_Temp_5"><sup><small>4</small></sup></a> programming, no matter in what
   975 language and on what platform, may be familiar with this concept.  First there
   976 is the object in memory that lets you manipulate the UI element, and secondly
   977 there is the UI element (known as ``control'', ``window'', ``widget'', etc.),
   978 also in memory but you don't usually access it directly. ]
   979 </span><p>
   980 By instantiating the calendar we create the JavaScript object.  It lets us
   981 configure some properties and it also knows how to create the UI element (the
   982 HTML elements actually) that will eventually be what the end-user sees on
   983 screen.  Creation of the HTML element is accomplished by the function
   984 <tt>Calendar.create</tt>.  It knows how to create popup or flat calendars.
   985 This function is described in section <a href="#node_sec_5.3.1">5.3.1</a>.</p>
   986 <p>
   987 Some properties need to be set prior to creating the HTML elements, because
   988 otherwise they wouldn't have any effect.  Such a property is
   989 <tt>weekNumbers</tt> -- it has the default value ``true'', and if you don't
   990 want the calendar to display the week numbers you have to set it to false.  If,
   991 however, you do that <em>after</em> calling <tt>Calendar.create</tt> the calendar
   992 would still display the week numbers, because the HTML elements are already
   993 created (including the <tt>&lt;td&gt;</tt>-s in the <tt>&lt;table&gt;</tt> element that
   994 should contain the week numbers).  For this reason the order of the steps above
   995 is important.</p>
   996 <p>
   997 Another example is when you want to show the calendar.  The ``create'' function
   998 does create the HTML elements, but they are initially hidden (have the style
   999 ``display: none'') unless the calendar is a flat calendar that should be always
  1000 visible in the page.  Obviously, the <tt></tt> function should be
  1001 called <em>after</em> calling <tt>Calendar.create</tt>.</p>
  1002 <p>
  1003 </p>
  1004 <a name="node_sec_4.3"></a>
  1005 <h2><a href="#node_toc_node_sec_4.3">4.3&nbsp;&nbsp;Caching the object</a></h2>
  1006 <p>Suppose the end-user has popped up a calendar and selects a date.  The calendar
  1007 then closes.  What really happens now?</p>
  1008 <p>
  1009 There are two approaches.  The first (used in very old versions of the
  1010 calendar) was to drop completely the Calendar object and when the end-user pops
  1011 up the calendar again to create another one.  This approach is bad for more
  1012 reasons:</p>
  1013 <p>
  1014 </p>
  1015 <ul><p>
  1016 </p>
  1017 <li><p>creating the JavaScript object and HTML elements is time-consuming</p>
  1018 <p>
  1019 </p>
  1020 <li><p>we may loose some end-user preferences (i.e. he might prefer to have
  1021 Monday for the first day of week and probably already clicked it the first time
  1022 when the calendar was opened, but now he has to do it again)</p>
  1023 <p>
  1024 </p>
  1025 </ul><p></p>
  1026 <p>
  1027 The second approach, implemented by the <tt>Calendar.setup</tt> function, is to
  1028 cache the JavaScript object.  It does this by checking the global variable
  1029 <tt>window.calendar</tt> and if it is not null it assumes it is the created
  1030 Calendar object.  When the end-user closes the calendar, our code will only
  1031 call ``<tt>hide</tt>'' on it, therefore keeping the JavaScript object and the
  1032 HTML elements in place.</p>
  1033 <p>
  1034 <font color="red">CAVEAT:</font> &nbsp;&nbsp;&nbsp;&nbsp;Since time selection support was introduced, this
  1035 ``object caching'' mechanism has the following drawback: if you once created
  1036 the calendar with the time selection support, then other items that may not
  1037 require this functionality will still get a calendar with the time selection
  1038 support enabled.  And reciprocal. ;-)  Hopefully this will be corrected in a
  1039 later version, but for now it doesn't seem such a big problem.</p>
  1040 <p>
  1041 </p>
  1042 <a name="node_sec_4.4"></a>
  1043 <h2><a href="#node_toc_node_sec_4.4">4.4&nbsp;&nbsp;Callback functions</a></h2>
  1044 <p>You might rightfully wonder how is the calendar related to the input field?
  1045 Who tells it that it has to update <em>that</em> input field when a date is
  1046 selected, or that it has to jump to <em>that</em> URL when a date is clicked in
  1047 flat mode?</p>
  1048 <p>
  1049 All this magic is done through callback functions.  The calendar doesn't know
  1050 anything about the existence of an input field, nor does it know where to
  1051 redirect the browser when a date is clicked in flat mode.  It just calls your
  1052 callback when a particular event is happening, and you're responsible to handle
  1053 it from there.  For a general purpose library I think this is the best model of
  1054 making a truly reusable thing.</p>
  1055 <p>
  1056 The calendar supports the following user callbacks:</p>
  1057 <p>
  1058 </p>
  1059 <ul><p>
  1060 </p>
  1061 <li><p><b>onSelect</b>&nbsp;&nbsp;  --  this gets called when the end-user changes the date in the
  1062 calendar.  Documented in section <a href="#node_sec_5.1">5.1</a>.</p>
  1063 <p>
  1064 </p>
  1065 <li><p><b>onClose</b>&nbsp;&nbsp;  --  this gets called when the calendar should close.  It's
  1066 user's responsibility to close the calendar.  Details in section
  1067 <a href="#node_sec_5.1">5.1</a>.</p>
  1068 <p>
  1069 </p>
  1070 <li><p><b>getDateStatus</b>&nbsp;&nbsp;  --  this function gets called for any day in a month,
  1071 just before displaying the month.  It is called with a JavaScript <tt>Date</tt>
  1072 object and should return <tt>true</tt> if that date should be disabled, false
  1073 if it's an ordinary date and no action should be taken, or it can return a
  1074 string in which case the returned value will be appended to the element's CSS
  1075 class (this way it provides a powerful way to make some dates ``special'',
  1076 i.e. highlight them differently).  Details in section
  1077 <a href="#node_sec_5.3.8">5.3.8</a>.</p>
  1078 <p>
  1079 </p>
  1080 </ul><p></p>
  1081 <p>
  1082 </p>
  1083 <a name="node_sec_5"></a>
  1084 <h1><a href="#node_toc_node_sec_5">5&nbsp;&nbsp;The Calendar object API reference</a></h1>
  1085 <p></p>
  1086 <p>
  1087 </p>
  1088 <a name="node_sec_5.1"></a>
  1089 <h2><a href="#node_toc_node_sec_5.1">5.1&nbsp;&nbsp;<tt>Calendar</tt> constructor</a></h2>
  1090 <p></p>
  1091 <p>
  1092 Synopsis:</p>
  1093 <p>
  1094 </p>
  1095 <pre class=verbatim>var calendar = Calendar(firstDayOfWeek, date, onSelect, onClose);
  1096 </pre><p></p>
  1097 <p>
  1098 Parameters are as follows:</p>
  1099 <p>
  1100 </p>
  1101 <ul><p>
  1102 </p>
  1103 <li><p><b>firstDayOfWeek</b>&nbsp;&nbsp;  --  specifies which day is to be displayed as the first
  1104 day of week.  Possible values are 0 to 6; 0 means Sunday, 1 means Monday,
  1105 ..., 6 means Saturday.</p>
  1106 <p>
  1107 </p>
  1108 <li><p><b>date</b>&nbsp;&nbsp;  --  a JavaScript Date object or <tt>null</tt>.  If <tt>null</tt>
  1109 is passed then the calendar will default to today date.  Otherwise it will
  1110 initialize on the given date.</p>
  1111 <p>
  1112 </p>
  1113 <li><p><b>onSelect</b>&nbsp;&nbsp;  --  your callback for the ``onChange'' event.  See above.</p>
  1114 <p>
  1115 </p>
  1116 <li><p><b>onClose</b>&nbsp;&nbsp;  --  your callback for the ``onClose'' event.  See above.</p>
  1117 <p>
  1118 </p>
  1119 </ul><p></p>
  1120 <p>
  1121 </p>
  1122 <a name="node_sec_Temp_6"></a>
  1123 <h3><a href="#node_toc_node_sec_Temp_6">The <tt>onSelect</tt> event</a></h3>
  1124 <p></p>
  1125 <p>
  1126 Here is a typical implementation of this function:</p>
  1127 <p>
  1128 </p>
  1129 <pre class=verbatim>function onSelect(calendar, date) {
  1130   var input_field = document.getElementById(&quot;date&quot;);
  1131   input_field.value = date;
  1132 };
  1133 </pre><p></p>
  1134 <p>
  1135 <tt>date</tt> is in the format selected with <tt>calendar.setDateFormat</tt>
  1136 (see section <a href="#node_sec_5.3.5">5.3.5</a>).  This code simply updates the
  1137 input field.  If you want the calendar to be in single-click mode then you
  1138 should also close the calendar after you updated the input field, so we come to
  1139 the following version:</p>
  1140 <p>
  1141 </p>
  1142 <pre class=verbatim>function onSelect(calendar, date) {
  1143   var input_field = document.getElementById(&quot;date&quot;);
  1144   input_field.value = date;
  1145   if (calendar.dateClicked) {
  1146     calendar.callCloseHandler(); // this calls &quot;onClose&quot; (see above)
  1147   }
  1148 };
  1149 </pre><p></p>
  1150 <p>
  1151 Note that we checked the member variable <tt>dateClicked</tt> and
  1152 only hide the calendar if it's <tt>true</tt>.  If this variable is <tt>false</tt> it
  1153 means that no date was actually selected, but the user only changed the
  1154 month/year using the navigation buttons or the menus.  We don't want to hide
  1155 the calendar in that case.</p>
  1156 <p>
  1157 </p>
  1158 <a name="node_sec_Temp_7"></a>
  1159 <h3><a href="#node_toc_node_sec_Temp_7">The <tt>onClose</tt> event</a></h3>
  1160 <p></p>
  1161 <p>
  1162 This event is triggered when the calendar should close.  It should hide or
  1163 destroy the calendar object -- the calendar itself just triggers the event, but
  1164 it won't close itself.</p>
  1165 <p>
  1166 A typical implementation of this function is the following:</p>
  1167 <p>
  1168 </p>
  1169 <pre class=verbatim>function onClose(calendar) {
  1170   calendar.hide();
  1171   // or calendar.destroy();
  1172 };
  1173 </pre><p></p>
  1174 <p>
  1175 </p>
  1176 <a name="node_sec_5.2"></a>
  1177 <h2><a href="#node_toc_node_sec_5.2">5.2&nbsp;&nbsp;Useful member variables (properties)</a></h2>
  1178 <p></p>
  1179 <p>
  1180 After creating the Calendar object you can access the following properties:</p>
  1181 <p>
  1182 </p>
  1183 <ul><p>
  1184 </p>
  1185 <li><p><tt>date</tt>  --  is a JavaScript <tt>Date</tt> object.  It will always
  1186 reflect the date shown in the calendar (yes, even if the calendar is hidden).</p>
  1187 <p>
  1188 </p>
  1189 <li><p><tt>isPopup</tt>  --  if this is true then the current Calendar object is
  1190 a popup calendar.  Otherwise (false) we have a flat calendar.  This variable is
  1191 set from <tt>Calendar.create</tt> and has no meaning before this function was
  1192 called.</p>
  1193 <p>
  1194 </p>
  1195 <li><p><tt>dateClicked</tt>  --  particularly useful in the <tt>onSelect</tt>
  1196 handler, this variable tells us if a date was really clicked.  That's because
  1197 the <tt>onSelect</tt> handler is called even if the end-user only changed the
  1198 month/year but did not select a date.  We don't want to close the calendar in
  1199 that case.</p>
  1200 <p>
  1201 </p>
  1202 <li><p><tt>weekNumbers</tt>  --  if <tt>true</tt> (default) then the calendar
  1203 displays week numbers.  If you don't want week numbers you have to set this
  1204 variable to <tt>false</tt> <em>before</em> calling <tt>Calendar.create</tt>.</p>
  1205 <p>
  1206 </p>
  1207 <li><p><tt>showsTime</tt> - if you set this to <tt>true</tt> (it is
  1208 <tt>false</tt> by default) then the calendar will also include a time selector.</p>
  1209 <p>
  1210 </p>
  1211 <li><p><tt>time24</tt> - if you set this to <tt>false</tt> then the time
  1212 selector will be in 12-hour format.  It is in 24-hour format by default.</p>
  1213 <p>
  1214 </p>
  1215 <li><p><tt>firstDayOfWeek</tt>  --  specifies the first day of week (0 to 6, pass
  1216 0 for Sunday, 1 for Monday, ..., 6 for Saturday).  This variable is set from
  1217 constructor, but you still have a chance to modify it <em>before</em> calling
  1218 <tt>Calendar.create</tt>.</p>
  1219 <p>
  1220 </p>
  1221 </ul><p></p>
  1222 <p>
  1223 There are lots of other member variables, but one should access them only
  1224 through member functions so I won't document them here.</p>
  1225 <p>
  1226 </p>
  1227 <a name="node_sec_5.3"></a>
  1228 <h2><a href="#node_toc_node_sec_5.3">5.3&nbsp;&nbsp;Public methods</a></h2>
  1229 <p></p>
  1230 <a name="node_sec_5.3.1"></a>
  1231 <h3><a href="#node_toc_node_sec_5.3.1">5.3.1&nbsp;&nbsp;<tt>Calendar.create</tt></a></h3>
  1232 <p></p>
  1233 <p>
  1234 This function creates the afferent HTML elements that are needed to display the
  1235 calendar.  You should call it after setting the calendar properties.  Synopsis:
  1236 </p>
  1237 <pre class=verbatim>calendar.create(); // creates a popup calendar
  1238   // -- or --
  1239 calendar.create(document.getElementById(parent_id)); // makes a flat calendar
  1240 </pre><p></p>
  1241 <p>
  1242 It can create a popup calendar or a flat calendar.  If the ``parent'' argument
  1243 is present (it should be a <em>reference</em> -- not ID -- to an HTML element) then
  1244 a flat calendar is created and it is inserted in the given element.</p>
  1245 <p>
  1246 At any moment, given a reference to a calendar object, we can inspect if it's a
  1247 popup or a flat calendar by checking the boolean member variable
  1248 <tt>isPopup</tt>:</p>
  1249 <p>
  1250 </p>
  1251 <pre class=verbatim>if (calendar.isPopup) {
  1252    // this is a popup calendar
  1253 } else {
  1254    // this is a flat calendar
  1255 }
  1256 </pre><p></p>
  1257 <p>
  1258 </p>
  1259 <a name="node_sec_5.3.2"></a>
  1260 <h3><a href="#node_toc_node_sec_5.3.2">5.3.2&nbsp;&nbsp;<tt>Calendar.callHandler</tt></a></h3>
  1261 <p></p>
  1262 <p>
  1263 This function calls the first user callback (the
  1264 <tt>onSelect</tt> handler) with the required parameters.</p>
  1265 <p>
  1266 </p>
  1267 <a name="node_sec_5.3.3"></a>
  1268 <h3><a href="#node_toc_node_sec_5.3.3">5.3.3&nbsp;&nbsp;<tt>Calendar.callCloseHandler</tt></a></h3>
  1269 <p></p>
  1270 <p>
  1271 This function calls the second user callback (the
  1272 <tt>onClose</tt> handler).  It's useful when you want to have a
  1273 ``single-click'' calendar -- just call this in your <tt>onSelect</tt> handler,
  1274 if a date was clicked.</p>
  1275 <p>
  1276 </p>
  1277 <a name="node_sec_5.3.4"></a>
  1278 <h3><a href="#node_toc_node_sec_5.3.4">5.3.4&nbsp;&nbsp;<tt>Calendar.hide</tt></a></h3>
  1279 <p></p>
  1280 <p>
  1281 Call this function to hide the calendar.  The calendar object and HTML elements
  1282 will not be destroyed, thus you can later call one of the <tt>show</tt>
  1283 functions on the same element.</p>
  1284 <p>
  1285 </p>
  1286 <a name="node_sec_5.3.5"></a>
  1287 <h3><a href="#node_toc_node_sec_5.3.5">5.3.5&nbsp;&nbsp;<tt>Calendar.setDateFormat</tt></a></h3>
  1288 <p></p>
  1289 <p>
  1290 This function configures the format in which the calendar reports the date to
  1291 your ``onSelect'' handler.  Call it like this:</p>
  1292 <p>
  1293 </p>
  1294 <pre class=verbatim>calendar.setDateFormat(&quot;%y/%m/%d&quot;);
  1295 </pre><p></p>
  1296 <p>
  1297 As you can see, it receives only one parameter, the required format.  The magic
  1298 characters are the following:</p>
  1299 <p>
  1300 </p>
  1301 <table border=0><tr><td valign=top ></td></tr>
  1302 <tr><td valign=top ><tt>%a</tt> </td><td valign=top >abbreviated weekday name </td></tr>
  1303 <tr><td valign=top ><tt>%A</tt> </td><td valign=top >full weekday name </td></tr>
  1304 <tr><td valign=top ><tt>%b</tt> </td><td valign=top >abbreviated month name </td></tr>
  1305 <tr><td valign=top ><tt>%B</tt> </td><td valign=top >full month name </td></tr>
  1306 <tr><td valign=top ><tt>%C</tt> </td><td valign=top >century number </td></tr>
  1307 <tr><td valign=top ><tt>%d</tt> </td><td valign=top >the day of the month ( 00 .. 31 ) </td></tr>
  1308 <tr><td valign=top ><tt>%e</tt> </td><td valign=top >the day of the month ( 0 .. 31 ) </td></tr>
  1309 <tr><td valign=top ><tt>%H</tt> </td><td valign=top >hour ( 00 .. 23 ) </td></tr>
  1310 <tr><td valign=top ><tt>%I</tt> </td><td valign=top >hour ( 01 .. 12 ) </td></tr>
  1311 <tr><td valign=top ><tt>%j</tt> </td><td valign=top >day of the year ( 000 .. 366 ) </td></tr>
  1312 <tr><td valign=top ><tt>%k</tt> </td><td valign=top >hour ( 0 .. 23 ) </td></tr>
  1313 <tr><td valign=top ><tt>%l</tt> </td><td valign=top >hour ( 1 .. 12 ) </td></tr>
  1314 <tr><td valign=top ><tt>%m</tt> </td><td valign=top >month ( 01 .. 12 ) </td></tr>
  1315 <tr><td valign=top ><tt>%M</tt> </td><td valign=top >minute ( 00 .. 59 ) </td></tr>
  1316 <tr><td valign=top ><tt>%n</tt> </td><td valign=top >a newline character </td></tr>
  1317 <tr><td valign=top ><tt>%p</tt> </td><td valign=top >``PM'' or ``AM'' </td></tr>
  1318 <tr><td valign=top ><tt>%P</tt> </td><td valign=top >``pm'' or ``am'' </td></tr>
  1319 <tr><td valign=top ><tt>%S</tt> </td><td valign=top >second ( 00 .. 59 ) </td></tr>
  1320 <tr><td valign=top ><tt>%s</tt> </td><td valign=top >number of seconds since Epoch (since Jan 01 1970 00:00:00 UTC) </td></tr>
  1321 <tr><td valign=top ><tt>%t</tt> </td><td valign=top >a tab character </td></tr>
  1322 <tr><td valign=top ><tt>%U, %W, %V</tt> </td><td valign=top >the week number</td></tr>
  1323 <tr><td valign=top ><tt>%u</tt> </td><td valign=top >the day of the week ( 1 .. 7, 1 = MON )</td></tr>
  1324 <tr><td valign=top ><tt>%w</tt> </td><td valign=top >the day of the week ( 0 .. 6, 0 = SUN )</td></tr>
  1325 <tr><td valign=top ><tt>%y</tt> </td><td valign=top >year without the century ( 00 .. 99 )</td></tr>
  1326 <tr><td valign=top ><tt>%Y</tt> </td><td valign=top >year including the century ( ex. 1979 )</td></tr>
  1327 <tr><td valign=top ><tt>%%</tt> </td><td valign=top >a literal <tt>%</tt> character
  1328 </td></tr></table><p>
  1329 There are more algorithms for computing the week number.  All
  1330 three specifiers currently implement the same one, as defined by ISO 8601:
  1331 ``the week 01 is the week that has the Thursday in the current year, which is
  1332 equivalent to the week that contains the fourth day of January.  Weeks start on
  1333 Monday.''</p>
  1334 <p>
  1335 </p>
  1336 <a name="node_sec_5.3.6"></a>
  1337 <h3><a href="#node_toc_node_sec_5.3.6">5.3.6&nbsp;&nbsp;<tt>Calendar.setTtDateFormat</tt></a></h3>
  1338 <p></p>
  1339 <p>
  1340 Has the same prototype as <tt>Calendar.setDateFormat</tt>, but refers to the
  1341 format of the date displayed in the ``status bar'' when the mouse is over some
  1342 date.</p>
  1343 <p>
  1344 </p>
  1345 <a name="node_sec_5.3.7"></a>
  1346 <h3><a href="#node_toc_node_sec_5.3.7">5.3.7&nbsp;&nbsp;<tt>Calendar.setDisabledHandler</tt></a></h3>
  1347 <p></p>
  1348 <p>
  1349 This function allows you to specify a callback function that checks if a
  1350 certain date must be disabled by the calendar.  You are responsible to write
  1351 the callback function.  Synopsis:</p>
  1352 <p>
  1353 </p>
  1354 <pre class=verbatim>function disallowDate(date) {
  1355   // date is a JS Date object
  1356   if (  date.getFullYear() == 2003 &amp;&amp;
  1357         date.getMonth()    == 6 /* July, it's zero-based */ &amp;&amp;
  1358         date.getDate()     == 5  ) {
  1359     return true; // disable July 5 2003
  1360   }
  1361   return false; // enable other dates
  1362 };
  1364 calendar.setDisabledHandler(disallowDate);
  1365 </pre><p></p>
  1366 <p>
  1367 If you change this function in ``real-time'', meaning, without creating a new
  1368 calendar, then you have to call <tt>calendar.refresh()</tt> to make it
  1369 redisplay the month and take into account the new disabledHandler.
  1370 <tt>Calendar.setup</tt> does this, so you have no such trouble with it.</p>
  1371 <p>
  1372 Note that <tt>disallowDate</tt> should be very fast, as it is called for each
  1373 date in the month.  Thus, it gets called, say, 30 times before displaying the
  1374 calendar, and 30 times when the month is changed.  Tests I've done so far show
  1375 that it's still good, but in the future I might switch it to a different design
  1376 (for instance, to call it once per month and to return an array of dates that
  1377 must be disabled).</p>
  1378 <p>
  1379 This function should be considered deprecated in the favor of
  1380 <tt>Calendar.setDateStatusHandler</tt>, described below.</p>
  1381 <p>
  1382 </p>
  1383 <a name="node_sec_5.3.8"></a>
  1384 <h3><a href="#node_toc_node_sec_5.3.8">5.3.8&nbsp;&nbsp;<tt>Calendar.setDateStatusHandler</tt></a></h3>
  1385 <p></p>
  1386 <p>
  1387 This function obsoletes <tt>Calendar.setDisabledHandler</tt>.  You call it with
  1388 a function parameter, but this function can return a boolean
  1389 <em>or a string</em>.  If the return value is a boolean (<tt>true</tt> or
  1390 <tt>false</tt>) then it behaves just like <tt>setDisabledHandler</tt>,
  1391 therefore disabling the date if the return value is <tt>true</tt>.</p>
  1392 <p>
  1393 If the returned value is a string then the given date will gain an additional
  1394 CSS class, namely the returned value.  You can use this to highlight some dates
  1395 in some way.  Note that you are responsible for defining the CSS class that you
  1396 return.  If you return the string ``disabled'' then that date will be disabled,
  1397 just as if you returned <tt>true</tt>.</p>
  1398 <p>
  1399 Here is a simple scenario that shows what you can do with this function.  The
  1400 following should be present in some of your styles, or in the document head in
  1401 a STYLE tag (but put it <em>after</em> the place where the calendar styles were
  1402 loaded):</p>
  1403 <p>
  1404 </p>
  1405 <pre class=verbatim>.special { background-color: #000; color: #fff; }
  1406 </pre><p></p>
  1407 <p>
  1408 And you would use the following code before calling <tt>Calendar.create()</tt>:</p>
  1409 <p>
  1410 </p>
  1411 <pre class=verbatim>// this table holds your special days, so that we can automatize
  1412 // things a bit:
  1413 var SPECIAL_DAYS = {
  1414     0 : [ 13, 24 ],             // special days in January
  1415     2 : [ 1, 6, 8, 12, 18 ],    // special days in March
  1416     8 : [ 21, 11 ],             // special days in September
  1417    11 : [ 25, 28 ]              // special days in December
  1418 };
  1420 // this function returns true if the passed date is special
  1421 function dateIsSpecial(year, month, day) {
  1422     var m = SPECIAL_DAYS[month];
  1423     if (!m) return false;
  1424     for (var i in m) if (m[i] == day) return true;
  1425     return false;
  1426 }
  1428 // this is the actual date status handler.  Note that it receives the
  1429 // date object as well as separate values of year, month and date, for
  1430 // your confort.
  1431 function dateStatusHandler(date, y, m, d) {
  1432     if (dateIsSpecial(y, m, d)) return ``special'';
  1433     else return false;
  1434     // return true above if you want to disable other dates
  1435 }
  1437 // configure it to the calendar
  1438 calendar.setDateStatusHandler(dateStatusHandler);
  1439 </pre><p></p>
  1440 <p>
  1441 The above code adds the ``special'' class name to some dates that are defined
  1442 in the SPECIAL_DAYS table.  Other dates will simply be displayed as default,
  1443 enabled.</p>
  1444 <p>
  1445 </p>
  1446 <a name="node_sec_5.3.9"></a>
  1447 <h3><a href="#node_toc_node_sec_5.3.9">5.3.9&nbsp;&nbsp;<tt></tt></a></h3>
  1448 <p></p>
  1449 <p>
  1450 Call this function do show the calendar.  It basically sets the CSS ``display''
  1451 property to ``block''.  It doesn't modify the calendar position.</p>
  1452 <p>
  1453 This function only makes sense when the calendar is in popup mode.</p>
  1454 <p>
  1455 </p>
  1456 <a name="node_sec_5.3.10"></a>
  1457 <h3><a href="#node_toc_node_sec_5.3.10">5.3.10&nbsp;&nbsp;<tt>Calendar.showAt</tt></a></h3>
  1458 <p></p>
  1459 <p>
  1460 Call this to show the calendar at a certain (x, y) position.  Prototype:</p>
  1461 <p>
  1462 </p>
  1463 <pre class=verbatim>calendar.showAt(x, y);
  1464 </pre><p></p>
  1465 <p>
  1466 The parameters are absolute coordinates relative to the top left
  1467 corner <em>of the page</em>, thus they are <em>page</em> coordinates not screen
  1468 coordinates.</p>
  1469 <p>
  1470 After setting the given coordinates it calls  This function only
  1471 makes sense when the calendar is in popup mode.</p>
  1472 <p>
  1473 </p>
  1474 <a name="node_sec_5.3.11"></a>
  1475 <h3><a href="#node_toc_node_sec_5.3.11">5.3.11&nbsp;&nbsp;<tt>Calendar.showAtElement</tt></a></h3>
  1476 <p></p>
  1477 <p>
  1478 This function is useful if you want to display the calendar near some element.
  1479 You call it like this:</p>
  1480 <p>
  1481 </p>
  1482 <pre class=verbatim>calendar.showAtElement(element, align);
  1483 </pre><p></p>
  1484 <p>
  1485 where element is a reference to your element (for instance it can be the input
  1486 field that displays the date) and align is an optional parameter, of type string,
  1487 containing one or two characters.  For instance, if you pass <tt>&quot;Br&quot;</tt> as
  1488 align, the calendar will appear <em>below</em> the element and with its right
  1489 margin continuing the element's right margin.</p>
  1490 <p>
  1491 As stated above, align may contain one or two characters.  The first character
  1492 dictates the vertical alignment, relative to the element, and the second
  1493 character dictates the horizontal alignment.  If the second character is
  1494 missing it will be assumed <tt>&quot;l&quot;</tt> (the left margin of the calendar will
  1495 be at the same horizontal position as the left margin of the element).</p>
  1496 <p>
  1497 The characters given for the align parameters are case sensitive.  This
  1498 function only makes sense when the calendar is in popup mode.  After computing
  1499 the position it uses <tt>Calendar.showAt</tt> to display the calendar there.</p>
  1500 <p>
  1501 </p>
  1502 <a name="node_sec_Temp_8"></a>
  1503 <h4><a href="#node_toc_node_sec_Temp_8">Vertical alignment</a></h4>
  1504 <p>The first character in ``<tt>align</tt>'' can take one of the following values:</p>
  1505 <p>
  1506 </p>
  1507 <ul><p>
  1508 </p>
  1509 <li><p><tt>T</tt>  --  completely above the reference element (bottom margin of
  1510 the calendar aligned to the top margin of the element).</p>
  1511 <p>
  1512 </p>
  1513 <li><p><tt>t</tt>  --  above the element but may overlap it (bottom margin of the calendar aligned to
  1514 the bottom margin of the element).</p>
  1515 <p>
  1516 </p>
  1517 <li><p><tt>c</tt>  --  the calendar displays vertically centered to the reference
  1518 element.  It might overlap it (that depends on the horizontal alignment).</p>
  1519 <p>
  1520 </p>
  1521 <li><p><tt>b</tt>  --  below the element but may overlap it (top margin of the calendar aligned to
  1522 the top margin of the element).</p>
  1523 <p>
  1524 </p>
  1525 <li><p><tt>B</tt>  --  completely below the element (top margin of the calendar
  1526 aligned to the bottom margin of the element).</p>
  1527 <p>
  1528 </p>
  1529 </ul><p></p>
  1530 <p>
  1531 </p>
  1532 <a name="node_sec_Temp_9"></a>
  1533 <h4><a href="#node_toc_node_sec_Temp_9">Horizontal alignment</a></h4>
  1534 <p>The second character in ``<tt>align</tt>'' can take one of the following values:</p>
  1535 <p>
  1536 </p>
  1537 <ul><p>
  1538 </p>
  1539 <li><p><tt>L</tt>  --  completely to the left of the reference element (right
  1540 margin of the calendar aligned to the left margin of the element).</p>
  1541 <p>
  1542 </p>
  1543 <li><p><tt>l</tt>  --  to the left of the element but may overlap it (left margin
  1544 of the calendar aligned to the left margin of the element).</p>
  1545 <p>
  1546 </p>
  1547 <li><p><tt>c</tt>  --  horizontally centered to the element.  Might overlap it,
  1548 depending on the vertical alignment.</p>
  1549 <p>
  1550 </p>
  1551 <li><p><tt>r</tt>  --  to the right of the element but may overlap it (right
  1552 margin of the calendar aligned to the right margin of the element).</p>
  1553 <p>
  1554 </p>
  1555 <li><p><tt>R</tt>  --  completely to the right of the element (left margin of the
  1556 calendar aligned to the right margin of the element).</p>
  1557 <p>
  1558 </p>
  1559 </ul><p></p>
  1560 <p>
  1561 </p>
  1562 <a name="node_sec_Temp_10"></a>
  1563 <h4><a href="#node_toc_node_sec_Temp_10">Default values</a></h4>
  1564 <p>If the ``<tt>align</tt>'' parameter is missing the calendar will choose
  1565 ``<tt>Br</tt>''.</p>
  1566 <p>
  1567 </p>
  1568 <a name="node_sec_5.3.12"></a>
  1569 <h3><a href="#node_toc_node_sec_5.3.12">5.3.12&nbsp;&nbsp;<tt>Calendar.setDate</tt></a></h3>
  1570 <p></p>
  1571 <p>
  1572 Receives a JavaScript <tt>Date</tt> object.  Sets the given date in the
  1573 calendar.  If the calendar is visible the new date is displayed immediately.</p>
  1574 <p>
  1575 </p>
  1576 <pre class=verbatim>calendar.setDate(new Date()); // go today
  1577 </pre><p></p>
  1578 <p>
  1579 </p>
  1580 <a name="node_sec_5.3.13"></a>
  1581 <h3><a href="#node_toc_node_sec_5.3.13">5.3.13&nbsp;&nbsp;<tt>Calendar.setFirstDayOfWeek</tt></a></h3>
  1582 <p></p>
  1583 <p>
  1584 Changes the first day of week.  The parameter has to be a numeric value ranging
  1585 from 0 to 6.  Pass 0 for Sunday, 1 for Monday, ..., 6 for Saturday.</p>
  1586 <p>
  1587 </p>
  1588 <pre class=verbatim>calendar.setFirstDayOfWeek(5); // start weeks on Friday
  1589 </pre><p></p>
  1590 <p>
  1591 </p>
  1592 <a name="node_sec_5.3.14"></a>
  1593 <h3><a href="#node_toc_node_sec_5.3.14">5.3.14&nbsp;&nbsp;<tt>Calendar.parseDate</tt></a></h3>
  1594 <p></p>
  1595 <p>
  1596 Use this function to parse a date given as string and to move the calendar to
  1597 that date.</p>
  1598 <p>
  1599 The algorithm tries to parse the date according to the format that was
  1600 previously set with <tt>Calendar.setDateFormat</tt>; if that fails, it still
  1601 tries to get some valid date out of it (it doesn't read your thoughts, though).</p>
  1602 <p>
  1603 </p>
  1604 <pre class=verbatim>calendar.parseDate(&quot;2003/07/06&quot;);
  1605 </pre><p></p>
  1606 <p>
  1607 </p>
  1608 <a name="node_sec_5.3.15"></a>
  1609 <h3><a href="#node_toc_node_sec_5.3.15">5.3.15&nbsp;&nbsp;<tt>Calendar.setRange</tt></a></h3>
  1610 <p></p>
  1611 <p>
  1612 Sets the range of years that are allowed in the calendar.  Synopsis:</p>
  1613 <p>
  1614 </p>
  1615 <pre class=verbatim>calendar.setRange(1970, 2050);
  1616 </pre><p></p>
  1617 <p>
  1618 </p>
  1619 <a name="node_sec_6"></a>
  1620 <h1><a href="#node_toc_node_sec_6">6&nbsp;&nbsp;Side effects</a></h1>
  1621 <p>The calendar code was intentionally embedded in an object to make it have as
  1622 less as possible side effects.  However, there are some -- not harmful, after
  1623 all.  Here is a list of side effects; you can count they already happened after
  1624 <tt>calendar.js</tt> was loaded.</p>
  1625 <p>
  1626 </p>
  1627 <ol><p>
  1628 </p>
  1629 <li><p>The global variable <tt>window.calendar</tt> will be set to null.  This
  1630 variable is used by the calendar code, especially when doing drag &amp; drop for
  1631 moving the calendar.  In the future I might get rid of it, but for now it
  1632 didn't harm anyone.</p>
  1633 <p>
  1634 </p>
  1635 <li><p>The JavaScript <tt>Date</tt> object is modified.  We add some properties
  1636 and functions that are very useful to our calendar.  It made more sense to add
  1637 them directly to the <tt>Date</tt> object than to the calendar itself.
  1638 Complete list:</p>
  1639 <p>
  1640 </p>
  1641 <ol><p>
  1642 </p>
  1643 <li><p><tt>Date._MD    = new Array(31,28,31,30,31,30,31,31,30,31,30,31);</tt>
  1644 </p>
  1645 <li><p><tt>Date.SECOND = 1000 /* milliseconds */;</tt>
  1646 </p>
  1647 <li><p><tt>Date.MINUTE = 60 * Date.SECOND;</tt>
  1648 </p>
  1649 <li><p><tt>Date.HOUR   = 60 * Date.MINUTE;</tt>
  1650 </p>
  1651 <li><p><tt>Date.DAY    = 24 * Date.HOUR;</tt>
  1652 </p>
  1653 <li><p><tt>Date.WEEK   =  7 * Date.DAY;</tt></p>
  1654 <p>
  1655 </p>
  1656 <li><p><tt>Date.prototype.getMonthDays</tt>(month)  --  returns the number of days
  1657 of the given month, or of the current date object if no month was given.</p>
  1658 <p>
  1659 </p>
  1660 <li><p><tt>Date.prototype.getWeekNumber</tt>()  --  returns the week number of the
  1661 date in the current object.</p>
  1662 <p>
  1663 </p>
  1664 <li><p><tt>Date.prototype.equalsTo</tt>(other_date)  --  compare the current date
  1665 object with <tt>other_date</tt> and returns <tt>true</tt> if the dates are
  1666 equal.  <em>It ignores time</em>.</p>
  1667 <p>
  1668 </p>
  1669 <li><p><tt>Date.prototype.print</tt>(format)  --  returns a string with the
  1670 current date object represented in the given format.  It implements the format
  1671 specified in section <a href="#node_sec_5.3.5">5.3.5</a>.</p>
  1672 <p>
  1673 </p>
  1674 </ol><p></p>
  1675 <p>
  1676 </p>
  1677 </ol><p></p>
  1678 <p>
  1679 </p>
  1680 <a name="node_sec_7"></a>
  1681 <h1><a href="#node_toc_node_sec_7">7&nbsp;&nbsp;Credits</a></h1>
  1682 <p>The following people either sponsored, donated money to the project or bought
  1683 commercial licenses (listed in reverse chronological order).  Your name could
  1684 be here too!  If you wish to sponsor the project (for instance request a
  1685 feature and pay me for implementing it) or donate some money please
  1686 <em>please</em> contact me at <tt><a href="mailto:mihai\"></a></tt>.</p>
  1687 <p>
  1688 </p>
  1689 <ul><p>
  1690 </p>
  1691 <li><p>Sunny Chowdhury (<a href=""></a>)</p>
  1692 <p>
  1693 </p>
  1694 <li><p>Ian Barrack (<a href=""></a>)</p>
  1695 <p>
  1696 </p>
  1697 <li><p>Himanshukumar Shah</p>
  1698 <p>
  1699 </p>
  1700 <li><p>Seyhan Ersoy (<a href=""></a>)</p>
  1701 <p>
  1702 </p>
  1703 <li><p>Jon Stokkeland (<a href=""></a>)</p>
  1704 <p>
  1705 </p>
  1706 </ul><p></p>
  1707 <p>
  1708 </p>
  1709 <div align=right><table><tr><td>
  1711 <b>Thank you!</b><br>
  1712  --  <tt></tt>
  1713 </td></tr></table></div>
  1714 <p>
  1715 </p>
  1716 <div class=footnoterule><hr></div><p></p>
  1717 <div class=footnote><p><a name="footnote_Temp_2"></a><a href="#call_footnote_Temp_2"><sup><small>1</small></sup></a> 
  1718 by the term ``widget'' I understand a single element of user interface.
  1719 But that's in Linux world.  For those that did lots of Windows
  1720 programming the term ``control'' might be more familiar
  1721 </p>
  1722 <p><a name="footnote_Temp_3"></a><a href="#call_footnote_Temp_3"><sup><small>2</small></sup></a> people report that the calendar does
  1723 not work with IE5/Mac.  However, this browser was discontinued and we
  1724 believe that supporting it doesn't worth the efforts, given the fact that
  1725 it has the worst, buggiest implementation for DOM I've ever seen.</p>
  1726 <p><a name="footnote_Temp_4"></a><a href="#call_footnote_Temp_4"><sup><small>3</small></sup></a>  under Opera 7 the calendar still lacks some functionality, such as
  1727 keyboard navigation; also Opera doesn't seem to allow disabling text
  1728 selection when one drags the mouse on the page; despite all that, the
  1729 calendar is still highly functional under Opera 7 and looks as good as
  1730 in other supported browsers. </p>
  1731 <p><a name="footnote_Temp_5"></a><a href="#call_footnote_Temp_5"><sup><small>4</small></sup></a> user interface</p>
  1732 </div>
  1733 <div align=right class=colophon>
  1734 <i>Last modified: Saturday, March 5th, 2005<br>
  1735 HTML conversion by <a href="">TeX2page 2004-09-11</a></i>
  1736 </div>
  1737 </body>
  1738 </html>