puter.ui.onWindowClose()

Sets a function to run when the window is about to close.

For example, the function runs right after the user presses the window's 'X' button.

Note onWindowClose is not called when app is closed using puter.exit().

Syntax

puter.ui.onWindowClose(handler)

Parameters

handler (Function)

A function to execute when the window is going to close.

Examples

Run code before the window closes

<html>
<body>
    <script src="https://js.puter.com/v2/"></script>
    <script>
        puter.ui.onWindowClose(function(){
            alert('Window is about to close!')
            puter.exit();
        })
    </script>
</body>
</html>