BeforeInstallPromptEvent: prompt() method

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The prompt() method of the BeforeInstallPromptEvent interface allows a developer to show the install prompt at a time of their own choosing. Typically this will be called in the event handler for the app's custom install UI.

This method must be called in the event handler for a user action (such as a button click) and may only be called once on a given BeforeInstallPromptEvent instance.






Return value

A Promise resolving to an object containing the following properties:

outcome Experimental Non-standard

A string indicating whether the user chose to install the app or not. It must be one of the following values:

  • "accepted": The user installed the app.
  • "dismissed": The user did not install the app.
platform Experimental Non-standard

If the user chose to install the app, this is a string naming the selected platform, which is one of the values from the BeforeInstallPromptEvent.platforms property. If the user chose not to install the app, this is an empty string.


Browser compatibility

BCD tables only load in the browser

See also