How can I get a js variable into iframe

Question

I have a dynamically created iframe

this iframe has js code

<script type="text/javascript"> if (window.devicePixelRatio >= 2) { document.body.className += ' is_2x'; } domReady(); Subscribe.init({id: 0, hash: '6ec859bd0192095f3b', oid: 15898180});;vk.id = 0; </script>

i need get the Subscribe.init() value from parent window

thanks

ps. I don't have edit permissions to this iframe. I need this value like text

I think this is not possible for security-reasons in most browsers. If it was possible, an iFrame you put into your webpage (for example a youtube video) could interfer with your main-pages scripts and contents, doing all kind of evil stuff. — Lars Ebert-Harlaar
– Lars Ebert-Harlaar, Commented Jul 14, 2013 at 20:54
assuming no CORs is available and your apps on on different domains, JSON.stringify the data and append it to the url hash of the iframe from the parent. in the frame, you can JSON.parse(location.hash.slice(1)) to get the object back. you can also use the "window.name" hack, or postMessage(). — dandavis
– dandavis, Commented Jul 14, 2013 at 21:00

haim770 · Accepted Answer · 2013-07-14 21:00:35Z

Assuming you don't run into Cross Domain Scripting issues (IFRAME is within the same domain as the parent window, or CORS is enabled and configured), you can try:

window.parent.Subscribe.init({id: 0, hash: '6ec859bd0192095f3b', oid: 15898180});

More about security issues you may encounter: http://en.wikipedia.org/wiki/Same_origin_policy

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