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Window.onbeforeinstallprompt

The Window.onbeforeinstallprompt property is an event handler for processing a beforeinstallprompt, which is dispatched on devices when a user is about to be prompted to "install" a web application. Its associated event may be saved for later and used to prompt the user at a more suitable time.

Syntax

window.addEventListener("beforeinstallprompt", function(event) { ... });
window.onbeforeinstallprompt = function(event) { ...};

Example

The following example uses the beforeinstallprompt event to make an install button operable, by using the event inside a click handler. 

window.addEventListener("beforeinstallprompt", function(beforeInstallPromptEvent) {
  beforeInstallPromptEvent.preventDefault(); // Prevents immediate prompt display

  // Shows prompt after a user clicks an "install" button
  installButton.addEventListener("click", function(mouseEvent) {
    // you should not use the MouseEvent here, obviously
    beforeInstallPromptEvent.prompt();
  });

  installButton.hidden = false; // Make button operable
});

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
onbeforeinstallprompt
61
79
No
No
48
No
61
61
No
45
No
8.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Window/onbeforeinstallprompt