Setting iFrame Height to Its Contents ...

Hey all.

I have an iFrame and I want it to expand / contract to fit its contents. The following code works on "some" of the loaded pages within the iframe, but on others it doesn't. I think the "Hgt2" below is what I need, that is the one that returns "null"; the other two return actual values.

I pulled some of this from Googling my issue, the statement below are the core of what I found to do but they don't work across the board.

What I need, I think, is the body height of the page that is being loaded into the iframe, but how do I get that value "consistently"??

iframe definition
<div id="iframeContainer" name="iframeContainer">
                  <iframe name="main" id="main" src="" width="100%" height="1000" frameborder="0">
                <div class="clear">&nbsp;</div>

$("#main").load(function (){
        alert('Hgt1: '+this.contentWindow.document.body.offsetHeight + 'px'+'\n'+
              'Hgt2: '+$(this).contents().find('body').height()+'\n'+
              'Hgt3: '+this.contentWindow.document .body.scrollHeight);
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COBOLdinosaurConnect With a Mentor Commented:
If the page being loaded are from a different domain, then any reference to the window or document object of the loaded page will fail because cross-domain scripting is a security violation that is enforced in every modern browser.

WebspeederAuthor Commented:

The problem is that the $('iframe').contents().find('body').height() comes back as null, so using that as a base won't work.

I need to either A) figure out why that value is null or B) figure out a way to calculate it based on the iframe's scroll height / innerheight etc.
WebspeederAuthor Commented:

Everything is within the same base domain, on our website. When I say base domain, I mean But, it seems that the one page that returns values is a static page on the web server itself, whereas the other pages are "loaded" from our internal server, meaning the html page is not on the web server, it resides on our internal server. It is sort of like JAVA in that the JAVA code is not on the web server, it's on a server that is called.

Would that matter? It seems coincidental, maybe I should test that some.
WebspeederAuthor Commented:
I think what I'm going to use is this. The base is from this link:

What I'm going to do is determine if it has a scrollbar and simply add to it until the scroll disappears.

var iFrameID = document.getElementById('main');
            var hasHorizontalScroll= iFrameID.contentWindow.document.body.scrollWidth>iFrameID.contentWindow.document.body.clientWidth;
            var hasVerticalScroll= iFrameID.contentWindow.document.body.scrollHeight>iFrameID.contentWindow.document.body.clientHeight;
            if (hasVerticalScroll)
                  $('#main').height($('#main').height() + 1500);

If anyone has any other suggestions please let me know.
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