How to communicate between iframe and the parent site?

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The website in the iframe isn’t located in the same domain, but both are mine, and I would like to communicate between the iframe and the parent site. Is it possible?

Answer

With different domains, it is not possible to call methods or access the iframe’s content document directly.

You have to use cross-document messaging.

For example in the top window:

 myIframe.contentWindow.postMessage('hello', '*');

and in the iframe:

window.onmessage = function(e){
    if (e.data == 'hello') {
        alert('It works!');
    }
};

If you are posting message from iframe to parent window

window.top.postMessage('hello', '*')


Source: stackoverflow