Question

I can see that this question has been asked several times, but none of the proposed solutions seem to work for the site I am building, so I am reopening the thread. I am attempting to size an iframe based on the height of it’s content. Both the page that contains the iframe and it’s source page exist on the same domain.

I have tried the proposed solutions in each of the following threads:

• Resize iframe height according to content height in it
• Resizing an iframe based on content

I believe that the solutions above are not working because of when the reference to body.clientHeight is made, the browser has not actually determined the height of the document.

Here is the code I am using:

    var ifmBlue = document.getElementById('ifmBlue');     ifmBlue.onload = resizeIframe;      function resizeIframe()     {         var ifmBlue = document.getElementById('ifmBluePill');         var ifmDiv = ifmBlue.contentDocument.getElementById('main');         var height = ifmDiv.clientHeight;         ifmBlue.style.height = (ifmBlue.contentDocument.body.scrollHeight || ifmBlue.contentDocument.body.offsetHeight || ifmBlue.contentDocument.body.parentNode.clientHeight || height ||  500) + 5 + 'px';     } 

If I debug the script using fire debug, the client height of the iframe.contentDocument’s main div is 0. Additionally, body.offsetHieght, & body.scrollHeight are 0. However, after the script is finished running, if I inspect the DOM of the HTML iframe element (using fire debug) I can see that the body’s clientHeight is 456 and the inner div’s clientHeight is 742. This leads me to believe that these values are not yet set when iframe.onload is fired. So, per one of the threads above, I moved the code into the body.onload event handler of the iframe’s source page. This solution also did not work.

Any help you can provide is much appreciated.

Thanks,

CJ

Answer 1

DynamicDrive has such a script, which I think does what you’re asking for.

There’s also a newer version now.

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2011 update:

I would strongly recommend using AJAX over something like this, especially considering that a dynamically resizing iframe only works across the same domain.

Even so, it’s a bit iffy, so if you absolutely must use AJAX over standard page loading, you really, really should use things like history.pushState (and have standard page loading as a fallback for browsers that don’t support it). There’s a jQuery plugin which handles this stuff for you, written by a GitHubber, called pjax, which they use only for repo navigation.