Unable to show Desktop Notifications using Google Chrome
- by Praveen Kumar
I followed the instructions as given in Using The Notifications API. Also I faced many problems like the below, because I added the document.querySelector() inside the <head> part:
Uncaught TypeError: Cannot call method 'addEventListener' of null
Now I have the below source, where I am able to Check Notification Support, and Check Notification Permissions links.
Guide me how to bring in notifications in a simpler way. Also, I tried this:
$("#html").click(function() {
if (window.webkitNotifications.checkPermission() == 0) {
createNotificationInstance({ notificationType: 'html' });
} else {
window.webkitNotifications.requestPermission();
}
});
Now I am stuck with this source. I need to generate HTML & Simple Notifications. Am I missing something? Please guide me.
Source:
<!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<title>Desktop Notifications</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script type="text/javascript">
function checkNotifications() {
if (window.webkitNotifications)
alert("Notifications are supported!");
else
alert("Notifications are not supported for this Browser/OS version yet.");
}
function createNotificationInstance(options) {
if (window.webkitNotifications.checkPermission() == 0) { // 0 is PERMISSION_ALLOWED
if (options.notificationType == 'simple') {
return window.webkitNotifications.createNotification('icon.png', 'Notification Title', 'Notification content...');
} else if (options.notificationType == 'html') {
return window.webkitNotifications.createHTMLNotification('http://localhost/');
}
} else {
window.webkitNotifications.requestPermission();
}
}
</script>
<style type="text/css">
* {font-family: Verdana, sans-serif;}
body {font-size: 10pt; margin: 0; padding: 0;}
p {margin: 5px;}
a {color: #09f; text-decoration: none;}
a:hover {color: #f00;}
</style>
</head>
<body>
<p><strong>Desktop Notifications</strong></p>
<p>Lets see how the notifications work in this browser.</p>
<p>
<a href="#" onclick="checkNotifications(); return false;">Check Notification Support</a>.
Next <a href="#" onclick="alert('Notifications are ' + ((window.webkitNotifications.checkPermission() == 0) ? '' : 'not ') + 'allowed!'); return false;">Check Notification Permissions</a>
and if permissions are not there,
<a href="#" onclick="window.webkitNotifications.requestPermission(); return false;">Request Permissions</a>.
Create a
<a href="#" id="text">Simple Notification</a>
or
<a href="#" id="html">HTML Notification</a>.
</p>
</body>
<script type="text/javascript">
document.querySelector("#html").addEventListener('click', function() {
if (window.webkitNotifications.checkPermission() == 0) {
createNotificationInstance({ notificationType: 'html' });
} else {
window.webkitNotifications.requestPermission();
}
}, false);
document.querySelector("#text").addEventListener('click', function() {
if (window.webkitNotifications.checkPermission() == 0) {
createNotificationInstance({ notificationType: 'simple' });
} else {
window.webkitNotifications.requestPermission();
}
}, false);
</script>
</html>
