Peter Lubbers - Pro HTML 5 Programming

var defaultTitle = "Portal [http://portal.example.com:9999]";
var notificationTimer = null;
var targetOrigin = "http://chat.example.net:9999";
function messageHandler(e) {
if (e.origin == targetOrigin) {
notify(e.data);
} else {
// ignore messages from other origins
}
}
CHAPTER 5 ■ USING THE COMMUNICATION APIS
function sendString(s) {
document.getElementById("widget").contentWindow.postMessage(s, targetOrigin);
}
function notify(message) {
stopBlinking();
blinkTitle(message, defaultTitle);
}
function stopBlinking() {
if (notificationTimer !== null) {
clearTimeout(notificationTimer);
}
document.title = defaultTitle;
}
function blinkTitle(m1, m2) {
document.title = m1;
notificationTimer = setTimeout(blinkTitle, 1000, m2, m1)
}
function sendStatus() {
var statusText = document.getElementById("statusText").value;
sendString(statusText);
}
function loadDemo() {
document.getElementById("sendButton").addEventListener("click", sendStatus, true);
document.getElementById("stopButton").addEventListener("click", stopBlinking, true);
sendStatus();
}
window.addEventListener("load", loadDemo, true);
window.addEventListener("message", messageHandler, true);
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