FFish FFish - 1 year ago 118
jQuery Question

jquery get height of iframe content when loaded

I have a Help page, help.php that I am loading inside an iframe in main.php
How can I get the height of this page once it has loaded in the iframe?

I am asking this because I can't style the height of to iframe to 100% or auto. That's why I think I need to use javascript..
I am using jQuery


body {
margin: 0;
padding: 0;
.container {
width: 900px;
height: 100%;
margin: 0 auto;
background: silver;
.help-div {
display: none;
width: 850px;
height: 100%;
position: absolute;
top: 100px;
background: orange;
#help-frame {
width: 100%;
height: auto;


$(document).ready(function () {
$("a.open-help").click(function () {
return false;


<div class='container'>
<!-- -->
<div class='help-div'>
<p>This is a div with an iframe loading the help page</p>
<iframe id="help-frame" src="../help.php" width="100%" height="100%" frameborder="1"></iframe>
</div> <a class="open-help" href="#">open Help in iFrame</a>

<p>hello world</p>
<p>hello world</p>
<p>hello world</p>
<p>hello world</p>
<p>hello world</p>

Answer Source

ok I finally found a good solution:

$('iframe').load(function() {
    this.style.height =
    this.contentWindow.document.body.offsetHeight + 'px';

Because some browsers (older Safari and Opera) report onload completed before CSS renders you need to set a micro Timeout and blank out and reassign the iframe's src.

$('iframe').load(function() {
    setTimeout(iResize, 50);
    // Safari and Opera need a kick-start.
    var iSource = document.getElementById('your-iframe-id').src;
    document.getElementById('your-iframe-id').src = '';
    document.getElementById('your-iframe-id').src = iSource;
function iResize() {
    document.getElementById('your-iframe-id').style.height = 
    document.getElementById('your-iframe-id').contentWindow.document.body.offsetHeight + 'px';
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