iframeCrossDomain/index.html at master · CicyChan/iframeCrossDomain · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>

</head>
<body>
	<br>
	<div>
	<iframe name="ifrm" id="ifrm" src="http://ChildHost:7080/ChidTest/Child.html" width="800px" height = "360px"></iframe>
	<form action="#" id="demoForm">
	    <label for="greeting">Enter a Greeting: </label>
	    <input type="text" name="greeting" id="greeting" value="Hello there!">
	    <br></br>
    </form>
    </div>


<script type="text/javascript">
//example variable and function for cross-document demo
var counter = 0;

function clearGreeting() {
    document.forms['demoForm'].elements['greeting'].value = '';
}

// check for browser support
if ( window.addEventListener ) {

    // message handler
    window.addEventListener('message', function (e) {
        // check message origin
        if ( e.origin === 'http://childhost:7080' ) {
            var task = e.data['task']; // task received in postMessage
            // get reference to iframe window
            var win = document.getElementById('ifrm').contentWindow;

            switch ( task ) { // postMessage tasks
                // obtain height of iframe and send in postMessage
                case 'height' :
                    var ht = document.getElementById('ifrm').offsetHeight;
                    win.postMessage( {'task': 'height', 'height': ht}, e.origin );
                    break;

                // increment counter variable and send
                case 'ctr' :
                    win.postMessage( {'task': 'ctr', 'counter': ++counter}, e.origin );
                    break;

                // send value of entry in text box (validate first)
                case 'val' :
                    var re = /[^-a-zA-Z!,'?\s]/g; // to filter out unwanted characters
                    // get reference to greeting text box
                    var fld = document.forms['demoForm'].elements['greeting'];
                    var val = fld.value.replace(re, '');
                    win.postMessage( {'task': 'val', 'val': val}, e.origin );

                    break;

                // clear text box by calling function
                case 'clear' :
                    clearGreeting();
                    break;

                //default:

            }

        }

    }, false);
}
</script>

</body>
</html>