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 iframe', '*')
