getElementById within iframe

Q: I have an iframe calling page X, on page X is a div w/ id=test. The value of this test div is "bubbles". On the parent page I need to read the value of the div and store it as a javascript var.

Outcome: on the parent page have a document.write(iframedivvalue); output that will = whatever the value of the div inside the iframe.

Note:

• as of right now page X is on a different domain.
• I am NOT trying to set anything ins开发者_运维知识库ide the iframe, just read a divs value.

As Alex says on the comment above, you will still be blocked by the JavaScript 'same-origin' policy.

If your iframe is on the same domain, then you could try this:

document.getElementById('iframe-id').contentDocument.getElementById('canvas');

You will still be blocked by the same-origin policy if the domains mismatch. Doesn't matter if you're just trying to grab a value.

Assuming the iFrame has an assigned ID:

var iframe_div = document.getElementById('iframeid').document.getElementById('mydiv');
var content = iframe_div.innerHTML;

I believe should work.