How do I detect if a cross-domain popup or iframe finish loading?

I'm opening a new window of a different domain from the host. I want to start pushing URL fragments when it's done. I've tried this...

<script type="text/javascript">
<!--
function checkPage() {
if (windowReference.document.readyState == 'complete') {
alert('Done')
return;
}
s开发者_运维知识库etTimeout('checkPage()',100);
}

var windowReference = window.open('popup.htm','WindowName');

setTimeout('checkPage()',100);
//-->
</script>

Credit: http://www.codingforums.com/archive/index.php/t-58396.html

But as the popup is cross-domain, the host cannot access windowReference.document.

Any other way around?

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It's not possible, you do not have control over the dom (document), so it's not possible to listen to any events of the popup.

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What about attaching on resize event on the host window and change width or height + or - 1 by from pop to trigger resize? Will it work on fully maximized window?

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Just use PostMessage for cross-domain communication.