Cross-Frame & Cross-Domain with postMessage

postMessage-xdomain.js

/**
 * parent document (e.g., modal containing an iframe tag)
 */

var eventMethod = window.addEventListener ? "addEventListener" : "attachEvent";
var eventer = window[eventMethod];
var messageEvent = eventMethod == "attachEvent" ? "onmessage" : "message";

// Listen to message from child window
eventer(messageEvent,function(e) {
	// call the method
	onPostMessage(e);
},false);
		

/**
 * iframe document
 */
parent.postMessage("hello", "*");