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onbeforeunload problems

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My client would like some of the larger forms on our project to alert the user if they attempt to navigate away before using the submit button.

Obviously I want to use a beforeunload event listener for this but I can't get it to fire.  In preview mode it fires an error because of the cross-source of the event listener, which is fine.  But in the live version it simply doesn't fire at all.  I'm using pretty simple syntax:

window.addEventListener("beforeunload", function(event) {
    event.returnValue = "Write something clever here..";

Is this something that Caspio suppresses?  Is there a workaround?  My client is pretty adamant about this functionality.

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