<!doctype html>
<html>
<head>
<title>Document A</title>
<meta charset="utf-8">
</head>
<body>
<iframe src="http://remote-domain.com:8080/document-B.html" id="zino_iframe"></iframe>
<script type="text/javascript">
var zino_resize = function (event) {
if (event.origin !== "http://remote-domain.com:8080") {
return;
}
var zino_iframe = document.getElementById('zino_iframe');
if (zino_iframe) {
zino_iframe.style.height = event.data + "px";
}
};
if (window.addEventListener) {
window.addEventListener("message", zino_resize, false);
} else if (window.attachEvent) {
window.attachEvent("onmessage", zino_resize);
}
</script>
</body>
</html>
<!doctype html>
<html>
<head>
<title>Document B</title>
<meta charset="utf-8">
<script type="text/javascript">
function iframe_resize(){
var body = document.body,
html = document.documentElement,
height = Math.max(body.scrollHeight, body.offsetHeight,
html.clientHeight, html.scrollHeight, html.offsetHeight);
if (parent.postMessage) {
parent.postMessage(height, "http://my-domain.com");
}
}
</script>
</head>
<body onload="iframe_resize();">
<h4>Document B</h4>
<p>Cross-Domain Iframe</p>
</body>
</html>
Normally, documents on different pages are able to communicate between each other only if their domains, protocols and ports match up. HTML 5 specification comes with window.postMessage, which provides cross-domain communication between scripts.
Syntax
window.postMessage(message, targetOrigin, [transfer]);
- message
- Messages can be nested objects and arrays, can contain JavaScript values (strings, numbers, Dates, etc), and can contain certain data objects such as File Blob, FileList, and ArrayBuffer objects.
- targetOrigin
- The value must be either asterisk
*, slash/or absolute URL. Otherwise a SyntaxError exception will be throw. If you know the window location, you should always provide this specific location instead of just putting an asterisk* - transfer (Optional)
- These objects are transferred with the message, and they are no longer usable on the sending side.