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How can you make two iFrames talk to each other? For example I was a element value off the 2nd iframe and the 1st iframe has the display element on it. I need to get the value off the 2nd frame to the 1st. How would I do this? Don't say use cookies, cause that will hurt with massive sum of data.
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Communicating directly between iframes is also possible by combining window. parent with target as defined above. In conclusion, the postMessage method is a more dynamic alternative to the single DOM, better suited if you load multiple pages in one iframe, but not always easier and it still requires the use of the DOM.
All you have to do is first dispatch an event from the iframe to the parent that notifies the parent that the iframe is loaded (essentially a "ready message"). The parent will be listening for messages and if it receives the "ready message" event, it can then reply to the iframe with whatever message you want to send.
You can consider to pass value between Iframe by using QueryString in Iframe src property.
postMessage in your web app sends to the main document's window , not to the iframe's. Specify the iframe's window object: document. getElementById('cross_domain_page').
If the <iframe> elements are served from the same domain, then they can access each other directly. For example, in iframe1 you could do:
document.getElementById('someDiv').innerHTML =
top.document.getElementById('otherIframe').contentWindow.
document.getElementById('someOtherDiv').innerHTML;
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