Adjust width and height of iframe to fit with content in it

Adjust width and height of iframe to fit with content in it

I need a solution for auto-adjusting the width and height of an iframe to barely fit its content. The point is that the width and height can be changed after the iframe has been loaded. I guess I need an event action to deal with the change in dimensions of the body contained in the iframe.


Solution 1:

<script type="application/javascript">

function resizeIFrameToFitContent( iFrame ) {

    iFrame.width  = iFrame.contentWindow.document.body.scrollWidth;
    iFrame.height = iFrame.contentWindow.document.body.scrollHeight;

window.addEventListener('DOMContentLoaded', function(e) {

    var iFrame = document.getElementById( 'iFrame1' );
    resizeIFrameToFitContent( iFrame );

    // or, to resize all iframes:
    var iframes = document.querySelectorAll("iframe");
    for( var i = 0; i < iframes.length; i++) {
        resizeIFrameToFitContent( iframes[i] );
} );


<iframe src="usagelogs/default.aspx" id="iFrame1"></iframe>

Solution 2:

Cross-browser jQuery plug-in.

Cross-bowser, cross domain library that uses mutationObserver to keep iFrame sized to the content and postMessage to communicate between iFrame and host page. Works with or without jQuery.

Solution 3:

All solutions given thus far only account for a once off resize. You mention you want to be able to resize the iFrame after the contents are modified. In order to do this, you need to execute a function inside the iFrame (once the contents are changed, you need to fire an event to say that the contents have changed).

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I was stuck with this for a while, as code inside the iFrame seemed limited to the DOM inside the iFrame (and couldn’t edit the iFrame), and code executed outside the iFrame was stuck with the DOM outside the iFrame (and couldn’t pick up an event coming from inside the iFrame).

The solution came from discovering (via assistance from a colleague) that jQuery can be told what DOM to use. In this case, the DOM of the parent window.

As such, code such as this does what you need (when run inside the iFrame) :

<script type="text/javascript">
    jQuery(document).ready(function () {
        jQuery("#IDofControlFiringResizeEvent").click(function () {
            var frame = $('#IDofiframeInMainWindow', window.parent.document);
            var height = jQuery("#IDofContainerInsideiFrame").height();
            frame.height(height + 15);

Solution 4:

If the iframe content is from the same domain this should work great. It does require jQuery though.

$('#iframe_id').load(function () {

To have it resize dynamically you could do this:

<script language="javaScript">
function autoResize(){
<iframe id="themeframe" onLoad="autoResize();" marginheight="0" frameborder="0" src="URL"></iframe>

Then on the page that the iframe loads add this:

<script language="javaScript">
function resize()

$(window).on('resize', resize);

Solution 5:

one-liner solution for embeds:
starts with a min-size and increases to content size. no need for script tags.

<iframe src="http://URL_HERE.html" onload='javascript:(function(o){"px";}(this));' style="height:200px;width:100%;border:none;overflow:hidden;"></iframe>

Solution 6:

Here is a cross-browser solution if you don’t want to use jQuery:

 * Resizes the given iFrame width so it fits its content
 * @param e The iframe to resize
function resizeIframeWidth(e){
    // Set width of iframe according to its content
    if (e.Document && e.Document.body.scrollWidth) //ie5+ syntax
        e.width = e.contentWindow.document.body.scrollWidth;
    else if (e.contentDocument && e.contentDocument.body.scrollWidth) //ns6+ & opera syntax
        e.width = e.contentDocument.body.scrollWidth + 35;
    else (e.contentDocument && e.contentDocument.body.offsetWidth) //standards compliant syntax – ie8
        e.width = e.contentDocument.body.offsetWidth + 35;