La interfaz Notification de la Notifications API se usa para configurar y mostrar notificaciones de escritorio al usuario. La apariencia y las funcionalidad especificas de esta notificacion varia a traves de las distintas plataformas, pero generalmente esta plataformas proveen un camino para proveer informacion al usuario de manera asincronica.
{{AvailableInWorkers}}
Notification.Estas propiedades solo estan disponibles en el objecto Notification en sí mismo.
denied (El usuario rechaza que las notificaciones sean mostradas).granted (El usuario acepta que las notificaciones sean mostradas).default (La elección del usuario es desconocida por lo tanto el navegador actuará como si el valor fuese denied).Estas propiedades solo están disponibles en instancias del objecto Notification.
Las siguientes propiedades están listadas en las especificaciones más actualizadas, pero aún no están soportadas por los navegadores. Es aconsejable verificarlas regularmente para ver si el estado de ellas ha sido actualizado, y háganos saber si encuentra información desactualizada.
The following event handlers are still supported as listed in the {{anch("browser compatibility")}} section below, but are no longer listed in the current spec. It is safe therefore to assume they are obsolete, and may stop working in future browser versions.
Notificación en sí.These properties are available only on an instance of the Notification object or through its prototype. The Notification object also inherits from the {{domxref("EventTarget")}} interface.
Assume this basic HTML:
<button onclick="notifyMe()">Notify me!</button>It's possible to send a notification as follows — here we present a fairly verbose and complete set of code you could use if you wanted to first check whether notifications are supported, then check if permission has been granted for the current origin to send notifications, then request permission if required, before then sending a notification.
function notifyMe() {
// Let's check if the browser supports notifications
if (!("Notification" in window)) {
alert("This browser does not support desktop notification");
}
// Let's check whether notification permissions have already been granted
else if (Notification.permission === "granted") {
// If it's okay let's create a notification
var notification = new Notification("Hi there!");
}
// Otherwise, we need to ask the user for permission
else if (Notification.permission !== 'denied') {
Notification.requestPermission(function (permission) {
// If the user accepts, let's create a notification
if (permission === "granted") {
var notification = new Notification("Hi there!");
}
});
}
// At last, if the user has denied notifications, and you
// want to be respectful there is no need to bother them any more.
}{{EmbedLiveSample('Example', '100%', 30)}}
In many cases, you don't need to be this verbose. For example, in our Emogotchi demo (see source code), we simply run {{domxref("Notification.requestPermission")}} regardless to make sure we can get permission to send notifications (this uses the newer promise-based method syntax):
Notification.requestPermission().then(function(result) {
console.log(result);
});Then we run a simple spawnNotification() function when we want to fire a notification — this is passed arguments to specify the body, icon and title we want, then it creates the necessary options object and fires the notification using the {{domxref("Notification.Notification","Notification()")}} constructor.
function spawnNotification(theBody,theIcon,theTitle) {
var options = {
body: theBody,
icon: theIcon
}
var n = new Notification(theTitle,options);
}| Specification | Status | Comment |
|---|---|---|
| {{SpecName('Web Notifications')}} | {{Spec2('Web Notifications')}} | Living standard |
{{CompatibilityTable}}
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 5{{property_prefix("webkit")}}[1] 22 |
4.0 {{property_prefix("moz")}}[2] 22 |
{{CompatNo}} | 25 | 6[3] |
icon |
5{{property_prefix("webkit")}}[1] 22 |
4.0 {{property_prefix("moz")}}[2] 22 |
{{CompatNo}} | 25 | {{CompatNo}} |
| Available in workers | {{CompatVersionUnknown}} | {{CompatGeckoDesktop("41.0")}} | {{CompatUnknown}} | {{CompatUnknown}} | {{CompatUnknown}} |
silent |
{{CompatChrome(43.0)}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} |
noscreen, sticky |
{{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} |
sound |
{{CompatVersionUnknown}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} |
renotify |
{{CompatChrome(50.0)}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} |
Promise-based Notification.requestPermission() |
{{CompatUnknown}} | {{CompatGeckoDesktop("47.0")}} | {{CompatUnknown}} | {{CompatUnknown}} | {{CompatUnknown}} |
| Feature | Android | Android Webview | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|---|
| Basic support | {{CompatUnknown}} |
{{CompatVersionUnknown}} |
4.0{{property_prefix("moz")}}[2] 22 |
1.0.1{{property_prefix("moz")}}[2] 1.2 |
{{CompatNo}} | {{CompatUnknown}} | {{CompatNo}} |
{{CompatVersionUnknown}} |
icon |
{{CompatUnknown}} | {{CompatVersionUnknown}} | 4.0{{property_prefix("moz")}}[2] 22 |
1.0.1{{property_prefix("moz")}}[2] 1.2 |
{{CompatNo}} | {{CompatUnknown}} | {{CompatNo}} | {{CompatVersionUnknown}} |
| Available in workers | {{CompatUnknown}} | {{CompatVersionUnknown}} | {{CompatGeckoMobile("41.0")}} | {{CompatUnknown}} | {{CompatUnknown}} | {{CompatUnknown}} | {{CompatUnknown}} | {{CompatVersionUnknown}} |
silent |
{{CompatNo}} | {{CompatChrome(43.0)}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatChrome(43.0)}} |
noscreen, sticky |
{{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} |
sound |
{{CompatNo}} | {{CompatVersionUnknown}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatVersionUnknown}} |
renotify |
{{CompatNo}} | {{CompatChrome(50.0)}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} | {{CompatNo}} |
Promise-based Notification.requestPermission() |
{{CompatUnknown}} | {{CompatUnknown}} | {{CompatGeckoMobile("47.0")}} | {{CompatUnknown}} | {{CompatUnknown}} | {{CompatUnknown}} | {{CompatUnknown}} | {{CompatUnknown}} |
[1] Before Chrome 22, the support for notification followed an old prefixed version of the specification and used the {{domxref("window.navigator.webkitNotifications","navigator.webkitNotifications")}} object to instantiate a new notification.
Before Chrome 32, {{domxref("Notification.permission")}} was not supported.
Before Chrome 42, service worker additions were not supported.
Starting in Chrome 49, notifications do not work in incognito mode.
[2] Prior to Firefox 22 (Firefox OS <1.2), the instantiation of a new notification must be done with the {{domxref("window.navigator.mozNotification", "navigator.mozNotification")}} object through its createNotification method.
Prior to Firefox 22 (Firefox OS <1.2), the Notification was displayed when calling the show method and supported only the click and close 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 use window.location.origin + "/my_icon.png" because window.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": {} }
[3] Safari started to support notification with Safari 6, but only on Mac OSX 10.8+ (Mountain Lion).