php_ajax_xmlhttprequest.asp

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<p>Other browsers uses a built in JavaScript object called <b>XMLHttpRequest</b>.</p>
<p>Here is the simplest code you can use to overcome this problem:</p>
<table class="ex" border="1" width="100%" id="table1">
	<tr>
		<td>
		<pre>var XMLHttp=null
if (window.XMLHttpRequest)
  {
  XMLHttp=new XMLHttpRequest()
  }
else if (window.ActiveXObject)
  {
  XMLHttp=new ActiveXObject(&quot;Microsoft.XMLHTTP&quot;)
  }
</pre>
		</td>
	</tr>
</table>
<p>Example above explained:</p>
<ol>
	<li>First create a variable <b>XMLHttp </b>to use as your XMLHttpRequest object. 
Set the value to null.</li>
	<li>Then test if the object <b>window.XMLHttpRequest</b> is available. This 
object is available in newer versions of Firefox, Mozilla, Opera, and Safari.</li>
	<li>If it's available, use it to create a new object: <b>XMLHttp=new 
XMLHttpRequest()</b></li>
	<li>If it's not available,&nbsp;test if an object <b>window.ActiveXObject</b> is 
available. This object is available in Internet Explorer version 5.5 and later.</li>
	<li>If it is available, use it to create a new object: <b>XMLHttp=new 
ActiveXObject()</b></li>
</ol>
<hr>
<h2>A Better Example?</h2>
<p>Some programmers will prefer to use the newest and fastest version of the 
XMLHttpRequest object. </p>
<p>The example below tries to load Microsoft's latest version &quot;Msxml2.XMLHTTP&quot;, 
available in Internet Explorer 6, before it falls back to &quot;Microsoft.XMLHTTP&quot;, 
available in Internet Explorer 5.5 and later. </p>
<table class="ex" border="1" width="100%" id="table2">
	<tr>
		<td>
		<pre>function GetXmlHttpObject()
{
var xmlHttp=null;</pre>
		<pre>try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 // Internet Explorer
 try
  {
  xmlHttp=new ActiveXObject(&quot;Msxml2.XMLHTTP&quot;);
  }
 catch (e)
  {
  xmlHttp=new ActiveXObject(&quot;Microsoft.XMLHTTP&quot;);
  }
 }
return xmlHttp;
}
</pre>
		</td>
	</tr>
</table>
<p>Example above explained:</p>
<ol>
	<li>First create a variable <b>XMLHttp </b>to use as your XMLHttpRequest object. 
Set the value to null.</li>
	<li>Try to create the object the according to web standards (Mozilla, Opera 
	and Safari):<b>XMLHttp=new XMLHttpRequest()</b></li>
	<li>Try to create the object the Microsoft way, available in Internet 
	Explorer 6 and later:<b>XMLHttp=new ActiveXObject(&quot;Msxml2.XMLHTTP&quot;)</b></li>
	<li>If this catches an error, try the older (Internet Explorer 5.5) way: <b>XMLHttp=new ActiveXObject(&quot;Microsoft.XMLHTTP&quot;)</b></li>
</ol>
<hr>
<h2>More about the XMLHttpRequest object</h2>
<p>If you want to read more about the XMLHttpRequest, visit our
<a href="../ajax/default.asp">AJAX tutorial</a>.</p>
<hr />

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