BeforeInstallPromptEvent: prompt() method

Limited availability

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.

Syntax

prompt()

Parameters

None.

Return value

A Promise resolving to an object containing the following properties:

• outcome Experimental

  • : 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

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

Examples

See the example for the BeforeInstallPromptEvent interface.

Browser compatibility

See also

• Making PWAs installable
• How to provide your own in-app install experience on web.dev (2021)