Trying to use window.onbeforeunload to trigger function

Question

In a webpage I am creating I want to disconnect from a connection automatically upon the closing of the page, yet it refuses to work. The disconnect function exists in an external .js file that is correctly referenced in the head.

<script>
    window.onbeforeunload = disconnect;
</script>

I previously changed it from "disconnect();" to "disconnect;". There was no change in result. Any help would be appreciated.

Answer 1

Because I have no idea what " disconnect " does, here is a simple example of how to bind a function to the window.onbeforeunload event:

<script type="text/javascript">

    // bind a function to the window.onbeforeunload event
    window.onbeforeunload = function(event) {
      // your disconnect() function
      disconnect();
      // bad ui, but for example - prompt user to verify they want to leave the page
      prompt("Are you sure you want to leave this page?");
      // log to the developer tools console that this event fired
      console.log("onbeforeunload event fired");
    };

</script>

Hopefully that helps. It looks like the problem may be in how you have disconnect() defined.