Kommunikation vom Iframe to Parent

Nachrichten oder Befehle von Iframe zu der Parent Seite schicken und auch andersrum.

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Der hier verwendete Code

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    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Parent Window</title>
</head>
<body>
    <h1>Parent Window</h1>
    <p>Send Message: <button id="message_button">Hi there iframe</button></p>
    <p>Got Message:</p>
    <div id="results"></div>
    <br/>
<iframe style="height:300px;width:400px" id="the_iframe" srcdoc="<!DOCTYPE html>
<html lang='en'>
<head>
    <meta charset='utf-8'>
    <title>iframe Window</title>
    <style>
        body {
            background-color: #D53C2F;
            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) {
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