Notificação

The Notification interface of the Notifications API is used to configure and display desktop notifications to the user.

Criador

Notification.Notification()

Cria uma nova instância do objeto de Notificação.

Propriedades

Propriedades estáticas

These properties are available only on the Notification object itself.

Notification.permission Read only

A string representing the current permission to display notifications. Possible value are: denied (the user refuses to have notifications displayed), granted (the user accepts having notifications displayed), or default (the user choice is unknown and therefore the browser will act as if the value were denied).

Propriedades de instância

These properties are available only on instances of the Notification object.

Notification.title Read only

The title of the notification as specified in the options parameter of the constructor.

Notification.dir Read only

The text direction of the notification as specified in the options parameter of the constructor.

Notification.lang Read only

The language code of the notification as specified in the options parameter of the constructor.

Notification.body Read only

The body string of the notification as specified in the options parameter of the constructor.

Notification.tag Read only

The ID of the notification (if any) as specified in the options parameter of the constructor.

Notification.icon Read only

The URL of the image used as an icon of the notification as specified in the options parameter of the constructor.

Notification.data Read only

Returns a structured clone of the notification’s data.

Unsupported properties

The following properties are listed in the most up-to-date spec, but are not supported in any browsers yet. It is advisable to keep checking back regularly to see if the status of these has updated, and let us know if you find any out of date information.

Notification.noscreen Read only

Specifies whether the notification firing should enable the device's screen or not.

Notification.renotify Read only

Specifies whether the user should be notified after a new notification replaces an old one.

Notification.silent Read only

Specifies whether the notification should be silent, i.e. no sounds or vibrations should be issued, regardless of the device settings.

Notification.sound Read only

Specifies a sound resource to play when the notification fires, in place of the default system notification sound.

Notification.sticky Read only

Specifies whether the notification should be 'sticky', i.e. not easily clearable by the user.

Notification.vibrate Read only

Specifies a vibration pattern for devices with vibration hardware to emit.

Event handlers

Notification.onclick

A handler for the click event. It is triggered each time the user clicks on the notification.

Notification.onerror

A handler for the error event. It is triggered each time the notification encounters an error.

Obsolete handlers

The following event handlers are still supported as listed in the browser compatibility section below, but are no longer listed in the current spec. I is safe therefore to assume they are obsolete, and may stop working in future browser versions.

Notification.onclose

A handler for the close event. It is triggered when the user closes the notification.

Notification.onshow

A handler for the show event. It is triggered when the notification is displayed.

Métodos

Métodos estáticos

These methods are available only on the Notification object itself.

Notification.requestPermission()

Requests permission from the user to display notifications.

Métodos de instância

These properties are available only on an instance of the Notification object or through its prototype. The Notification object also inherits from the EventTarget interface.

Notification.close()

Programmatically closes a notification.

Exemplo

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 alredy 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.
}

In many cases, you don't need to be this verbose. For example, in our Emogotchi demo (see source code), we simply run Notification.requestPermission regardless to make sure we can get permission to send notifications:

Notification.requestPermission();

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 Notification() constructor.

function spawnNotification(theBody,theIcon,theTitle) {
  var options = {
      body: theBody,
      icon: theIcon
  }
  var n = new Notification(theTitle,options);
}

Especificações

Compatibilidade do navegador

Notas do Firefox OS

Notas do Chrome

Notas do Safari

Ver também

• Utilizar API de Notificações