Summary
The onshow
property of the Notification
interface specifies an event listener to receive show
events. These events occur when a Notification
is displayed.
Syntax
Notification.onshow = function() { ... };
Specifications
This event handler is no longer listed in the Notifications API spec.
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 5 webkit (see notes) 22 |
4.0 moz (see notes) 22 |
Not supported | 25 | 6 (see notes) |
icon |
5 webkit (see notes) 22 |
4.0 moz (see notes) 22 |
Not supported | 25 | Not supported |
noscreen , renotify , silent , sound , sticky |
Not supported | Not supported | Not supported | Not supported | Not supported |
Feature | Android | Android Webview | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Mobile |
---|---|---|---|---|---|---|---|---|
Basic support | ? |
(Yes) |
4.0 moz (see notes) 22 |
1.0.1 moz (see notes) 1.2 |
Not supported | ? | Not supported |
(Yes) |
icon |
? | (Yes) | 4.0 moz (see notes) 22 |
1.0.1 moz (see notes) 1.2 |
Not supported | ? | Not supported | (Yes) |
noscreen , renotify , silent , sound , sticky |
Not supported | Not supported | Not supported | Not supported | Not supported | Not supported | Not supported | Not supported |
Firefox OS notes
- Prior to Firefox 22 (Firefox OS <1.2), the instantiation of a new notification must be done with the
navigator.mozNotification
object through itscreateNotification
method. - Prior to Firefox 22 (Firefox OS <1.2), the Notification was displayed when calling the
show
method and supported only theclick
andclose
events. - Nick Desaulniers wrote a Notification shim to cover both newer and older implementations.
- One particular Firefox OS issue is that you can pass a path to an icon to use in the notification, but if the app is packaged you cannot use a relative path like
/my_icon.png
. You also can't usewindow.location.origin + "/my_icon.png"
becausewindow.location.origin
is null in packaged apps. The manifest origin field fixes this, but it is only available in Firefox OS 1.1+. A potential solution for supporting Firefox OS <1.1 is to pass an absolute URL to an externally hosted version of the icon. This is less than ideal as the notification is displayed immediately without the icon, then the icon is fetched, but it works on all versions of Firefox OS. - When using notifications in a Firefox OS app, be sure to add the
desktop-notification
permission in your manifest file. Notifications can be used at any permission level, hosted or above."permissions": { "desktop-notification":{} }
Chrome notes
- Prior to Chrome 22, the support for notification followed an old prefixed version of the specification and used the
navigator.webkitNotifications
object to instantiate a new notification. - Prior to Chrome 32,
Notification.permission
was not supported.
Safari notes
- Safari started to support notification with Safari 6, but only on Mac OSX 10.8+ (Mountain Lion).