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ka-Map Overview
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<h2>xhr.js</h2>
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<h4>Summary</h4>
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No overview generated for 'xhr.js'<BR/><BR/>
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<code>static void</code>
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<code>
<b>
<a href="GLOBALS.html#!s!call">call</a></b>(u,o,f)
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<code>static Object</code>
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<a href="GLOBALS.html#!s!getXMLHTTP">getXMLHTTP</a></b>()
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<code>static void</code>
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<code>
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<a href="GLOBALS.html#!s!xmlResult">xmlResult</a></b>()
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<pre class="sourceview"><span class="comment">/**********************************************************************
*
* $Id: overview-summary-xhr.js.html,v 1.1 2006/03/15 15:56:59 pspencer Exp $
*
* purpose: a simple cross-browser XmlHttpRequest interface that adds
* support for multiple, concurrent requests
*
* author: Paul Spencer (pspencer<span class="attrib">@dmsolutions</span>.ca)
*
* TODO:
* - reponse only contains responseText, should contain response so
* access to reponseXML is possible if we ever want to implement
* xml stuff (i.e. real AJAX)
*
**********************************************************************
*
* Copyright (c) 2005, DM Solutions Group Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
**********************************************************************/</span>
<span class="comment">/* to make an asynchronous call to the server, execute the call() function
* with the URL to the script to be executed. The second and third
* parameters to call() define object and method to call when the server
* returns its response ... if the second parameter is null, third is
* just a function. If second is an object, then the third is a method
* of that instance.
*
* There is an optional fourth parameter to issue the request as a POST
* to the server. This is important in some browsers due to limited
* URL length.
*
* The callback function is called when the request completes. There is
* currently no callback for errors so they just silently fail if the
* server side script dies. The callback function is passed a single
* parameter, the text output of the server side script. In ka-Map, this
* text is typically some javascript to eval().
*/</span>
var aXmlHttp = new Array();
var aXmlResponse = new Array();
<span class="reserved">function</span> xmlResult()
{
<span class="reserved">for</span>(var i=0;i<aXmlHttp.length;i++)
{
<span class="reserved">if</span>(aXmlHttp[i] && aXmlHttp[i][0] && aXmlHttp[i][0].readyState==4&&aXmlHttp[i][0].responseText)
{
<span class="comment">//must null out record before calling function in case</span>
<span class="comment">//function invokes another xmlHttpRequest.</span>
var f = aXmlHttp[i][2];
var o = aXmlHttp[i][1];
var s = aXmlHttp[i][0].responseText;
aXmlHttp[i][0] = null;
aXmlHttp[i][1] = null;
aXmlHttp[i] = null;
f.apply(o,new Array(s));
}
}
}
<span class="comment">// u -> url</span>
<span class="comment">// o -> object (can be null) to invoke function on</span>
<span class="comment">// f -> callback function</span>
<span class="comment">// p -> optional argument to specify POST</span>
<span class="reserved">function</span> call(u,o,f)
{
var method = <span class="literal">"GET"</span>;
var dat;
<span class="reserved">if</span> (arguments.length==4){
method = <span class="literal">"POST"</span>;
tmp = u.split(/\?/);
u = tmp[0];
dat = tmp[1];
}
var idx = aXmlHttp.length;
<span class="reserved">for</span>(var i=0; i<idx;i++)
<span class="reserved">if</span> (aXmlHttp[i] == null)
{
idx = i;
break;
}
aXmlHttp[idx]=new Array(2);
aXmlHttp[idx][0] = getXMLHTTP();
aXmlHttp[idx][1] = o;
aXmlHttp[idx][2] = f;
<span class="reserved">if</span>(aXmlHttp[idx])
{
aXmlHttp[idx][0].open(method,u,true);
<span class="reserved">if</span>(method == <span class="literal">"POST"</span>){
aXmlHttp[idx][0].setRequestHeader(<span class="literal">"Content-Type"</span>, <span class="literal">"application/x-www-form-urlencoded"</span>);
aXmlHttp[idx][0].send(dat);
}
aXmlHttp[idx][0].onreadystatechange=xmlResult;
<span class="reserved">if</span>(method ==<span class="literal">"GET"</span>){ aXmlHttp[idx][0].send(null);}
}
}
<span class="reserved">function</span> getXMLHTTP()
{
var A=null;
<span class="reserved">if</span>(!A && typeof XMLHttpRequest != <span class="literal">"undefined"</span>)
{
A=new XMLHttpRequest();
}
<span class="reserved">if</span> (!A)
{
try
{
A=new ActiveXObject(<span class="literal">"Msxml2.XMLHTTP"</span>);
}
catch(e)
{
try
{
A=new ActiveXObject(<span class="literal">"Microsoft.XMLHTTP"</span>);
}
catch(oc)
{
A=null
}
}
}
<span class="reserved">return</span> A;
}</pre>
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<div class="jsdoc_ctime">Documentation generated by <a href="http://jsdoc.sourceforge.net/" target="_parent">JSDoc</a> on Wed Mar 15 10:50:59 2006</div>
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