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Auto resize iframe height when the height of the iframe contents change (same domain)

I am loading an iframe inside a page, which the length of the content of the iframe will be changed from time to time. I have implemented the following solution. However the height is fixed as the dyniframesize only get call when iframe.onload.

It is possible to have the iframe to be resized accordingly from time to time the height of the iframe changed?

<iframe src ="popup.html" frameborder="0" marginheight="0" marginwidth="0" frameborder="0" scrolling="auto" id="ifm" name="ifm" onload="javascript:dyniframesize('ifm');" width="100%"></iframe> 

function dyniframesize(down) { 
var pTar = null; 
if (document.getElementById){ 
pTar = document.getElementById(down); 
} 
else{ 
eval('pTar = ' + down + ';'); 
} 
if (pTar && !window.opera){ 
//begin resizing iframe 
pTar.style.display="block" 
if (pTar.contentDocument && pTar.contentDocument.body.offsetHeight){ 
//ns6 syntax 
pTar.height = pTar.contentDocument.body.offsetHeight +20; 
pTar.width = pTar.contentDocument.body.scrollWidth+20; 
} 
else if (pTar.Document && pTar.Document.body.scrollHeight){ 
//ie5+ syntax 
pTar.height = pTar.Document.body.scrollHeight; 
pTar.width = pTar.Document.body.scrollWidth; 
} 
} 
} 
</script> 
like image 308
user2625363 Avatar asked Dec 26 '13 18:12

user2625363


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How do I adjust the iframe height automatically?

Answer: Use the contentWindow Property You can use the JavaScript contentWindow property to make an iFrame automatically adjust its height according to the contents inside it, so that no vertical scrollbar will appear.

How do I make my iframe height 100%?

given the iframe is directly under body. If the iframe has a parent between itself and the body, the iframe will still get the height of its parent. One must explicitly set the height of every parent to 100% as well (if that's what one wants).


Video Answer


3 Answers

To my knowledge, there isn't a very natural way of doing this, but there are some options.

setInterval()

You could use setInterval() to repeatadly check the iframe's content height and adjust it if needed. This is simple, but inefficient.

Event Listeners

Any change of content in the iframe's content (and therefore height) is usually triggered by some event. Even if you're adding content from outside of the iframe, that "add" is probably triggered by a button click, for example. Here's something that might work for you: Live demo here (click).

var myIframe = document.getElementById('myIframe');

window.addEventListener('click', resizeIframe);
window.addEventListener('scroll', resizeIframe);
window.addEventListener('resize', resizeIframe);

myIframe.contentWindow.addEventListener('click', resizeIframe);

function resizeIframe() {
  console.log('resize!');
}

Mutation Observer

This solution works in all up-to-date browsers - http://caniuse.com/mutationobserver

Live demo here (click).

It's really simple and should catch the relevant changes. If not, you could combine it with the event listener solution above to be sure things are updated!

var $myIframe = $('#myIframe');
var myIframe = $myIframe[0];

var MutationObserver = window.MutationObserver || window.WebKitMutationObserver;

myIframe.addEventListener('load', function() {
  setIframeHeight();

  var target = myIframe.contentDocument.body;

  var observer = new MutationObserver(function(mutations) {
    setIframeHeight();
  });

  var config = {
    attributes: true,
    childList: true,
    characterData: true,
    subtree: true
  };
  observer.observe(target, config);
});

myIframe.src = 'iframe.html';

function setIframeHeight() {
  $myIframe.height('auto');
  var newHeight = $('html', myIframe.contentDocument).height();
  $myIframe.height(newHeight);
}

Honorable mention to: overflow/underflow events.

Read about it here (there's A LOT to it).

and see my demo here (doesn't work in IE 11!).

This was a cool solution, but it's no longer working in IE. It might be possible to tweak it, but I'd rather use one of the above solutions, even if I had to fallback to a 1 second setInterval for older browsers, just because it's a lot simpler than this solution.

like image 134
m59 Avatar answered Oct 19 '22 07:10

m59


I wrote a small Library that uses mutationaObserver and eventListners, with fall backs to setInterval for IE8-10 and works for both same domain and cross domain. It can size both height and width.

http://davidjbradshaw.github.io/iframe-resizer/

like image 6
David Bradshaw Avatar answered Oct 19 '22 09:10

David Bradshaw


iFrame View

<script type="text/javascript">
    var height = $("body").outerHeight();
    parent.SetIFrameHeight(height);
</script>

Main View

<script type="text/javascript">
    SetIFrameHeight = function(height) {
        $("#iFrameWrapper").height(height);
    }
</script>
like image 4
Owen Avatar answered Oct 19 '22 08:10

Owen