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iframe2.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>iframe Window</title>
<style>
body {
background-color: #000000;
color: white;
}
</style>
</head>
<body>
<h1>Hello there, i'm an iframe</h1>
<p>Send Message: <button id="message_button">Hi parent</button></p>
<p>Got Message:</p>
<div id="results"></div>
<script>
// addEventListener support for IE8
function bindEvent(element, eventName, eventHandler) {
if (element.addEventListener) {
element.addEventListener(eventName, eventHandler, false);
} else if (element.attachEvent) {
element.attachEvent("on" + eventName, eventHandler);
}
}
// Send a message to the parent
var sendMessage = function (msg) {
// Make sure you are sending a string, and to stringify JSON
window.parent.postMessage(msg, "*");
};
var results = document.getElementById("results"),
messageButton = document.getElementById("message_button");
// Listen to messages from parent window
bindEvent(window, "message", function (e) {
results.innerHTML = e.data;
});
// Send a message data with timestamp on every button click
bindEvent(messageButton, "click", function (e) {
const currentDate = new Date();
sendMessage("Ello there mate " + currentDate);
});
</script>
</body>
</html>