<div>
try this one 

<pre><code class="code-10 nolinks" id="code-259920">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.01 Transitional//EN&quot;&gt;
&lt;html&gt;
&lt;head&gt;
&lt;META http-equiv=&quot;Content-Type&quot; content=&quot;text/html; charset=utf-8&quot;&gt;
&lt;title&gt;Trans&lt;/title&gt;
&lt;script type=&quot;text/javascript&quot;&gt;
var iframeEl = document.getElementById('trans');
if ( iframeEl.contentDocument ) { // DOM
 iframeEl = iframeEl.contentDocument;
} else if ( iframeEl.contentWindow ) { // IE win
 iframeEl = iframeEl.contentWindow.document;
}
function trans () {
 alert(iframeEl.innerHTML);
 }
}
 
&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div&gt;
 
&lt;iframe src=&quot;stuff.php&quot; name=&quot;trans&quot; id=&quot;trans&quot; width=&quot;98%&quot; height=&quot;200&quot;&gt;&lt;/iframe&gt;
 
&lt;a href=&quot;#&quot; onclick=&quot;trans();return false&quot;&gt;Trans&lt;/a&gt;
 
&lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>
</div>

<div>
Sorry it should be this way 

<pre><code class="code-10 nolinks" id="code-259931">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.01 Transitional//EN&quot;&gt;
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;Trans&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div&gt;
&lt;iframe src=&quot;test.htm&quot; name=&quot;trans&quot; id=&quot;trans&quot; width=&quot;98%&quot; height=&quot;200&quot;&gt;&lt;/iframe&gt;
 
&lt;a href=&quot;#&quot; onclick=&quot;transFunction();return false&quot;&gt;Trans&lt;/a&gt;
 
&lt;/div&gt;
&lt;/body&gt;
&lt;script language=&quot;javascript&quot; type=&quot;text/javascript&quot;&gt;
var iframeEl = document.getElementById('trans');
if ( iframeEl.contentDocument ) { // DOM
 iframeEl = iframeEl.contentDocument;
} else if ( iframeEl.contentWindow ) { // IE win
 iframeEl = iframeEl.contentWindow.document;
}
function transFunction () {
 alert(iframeEl.body.innerHTML);
 }
 
&lt;/script&gt;
&lt;/html&gt;
</code></pre>
</div>

<div>
replace test.htm with stuff.php
</div>

<div>
If you're trying to alert the actual source code? (is that what you mean by contents of the iframe?) Then you will have to do it via AJAX 
 
@Sunithair: That alerts me a blank box in Firefox? 

<pre><code class="code-10 nolinks" id="code-259937">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.01 Transitional//EN&quot;&gt;
&lt;html&gt;
&lt;head&gt;
&lt;META http-equiv=&quot;Content-Type&quot; content=&quot;text/html; charset=utf-8&quot;&gt;
&lt;title&gt;Trans&lt;/title&gt;
&lt;script type=&quot;text/javascript&quot; language=&quot;javascript&quot;&gt;
 
 function trans()
 {
 var httpRequest;
 try 
 {
 httpRequest = new XMLHttpRequest(); // Mozilla, Safari, etc
 }
 catch(trymicrosoft)
 {
 try
 {
 httpRequest = new ActiveXObject(&quot;Msxml2.XMLHTTP&quot;);
 }
 catch(oldermicrosoft)
 {
 try
 {
 httpRequest = new ActiveXObject(&quot;Microsoft.XMLHTTP&quot;);
 }
 catch(failed)
 {
 httpRequest = false;
 }
 }
 }
 if(!httpRequest)
 {
 alert('Your browser does not support Ajax.');
 return false;
 }
 
 httpRequest.onreadystatechange = function()
 {
 if(httpRequest.readyState == 4)
 if(httpRequest.status == 200)
 alert(httpRequest.responseText);
 else
 alert('Request Error: '+httpRequest.status);
 }
		
		var trans = document.getElementById('trans');
		httpRequest.open('GET',trans.src,true);
 httpRequest.send(null);
 
 }
 &lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div&gt;
 
&lt;iframe src=&quot;/admin&quot; name=&quot;trans&quot; id=&quot;trans&quot; width=&quot;98%&quot; height=&quot;200&quot;&gt;&lt;/iframe&gt;
 
&lt;a href=&quot;#&quot; onclick=&quot;trans();return false&quot;&gt;Trans&lt;/a&gt;
 
&lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>
</div>

<div>
<div class="content wysiwyg-content">
How can I alert the entire contents of my iframe? 

<pre><code class="code-10 nolinks" id="code-259914">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.01 Transitional//EN&quot;&gt;
&lt;html&gt;
&lt;head&gt;
&lt;META http-equiv=&quot;Content-Type&quot; content=&quot;text/html; charset=utf-8&quot;&gt;
&lt;title&gt;Trans&lt;/title&gt;
&lt;script type=&quot;text/javascript&quot;&gt;
 
function trans () {
	var trans = window.frames['trans'];
	if (trans) {
	var result = trans.document.innerHTML;
	alert(result);
	}
}
 
&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div&gt;
 
&lt;iframe src=&quot;stuff.php&quot; name=&quot;trans&quot; id=&quot;trans&quot; width=&quot;98%&quot; height=&quot;200&quot;&gt;&lt;/iframe&gt;
 
&lt;a href=&quot;#&quot; onclick=&quot;trans();return false&quot;&gt;Trans&lt;/a&gt;
 
&lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>
</div>
</div>

How can I alert the entire contents of my iframe?

Alert entire contents of iframe

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.