alex adam

From parent page -> iframe

In the parent page:

const iframe = document.getElementById('iframe'); 
iframe.contentWindow.postMessage('some message', '*');

In the iframe:

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

From iframe -> parent page

In the parent page:

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

In the iframe:

window.top.postMessage('from…

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