Javascript onbeforeunload cancel

Question

Is there a way to cancel the javascript event onbeforeunload, and just have it execute a function and return to the page?

window.onbeforeunload = function(){
    //execute some logic
    return false;
}

Answer 1

No. You cannot cancel this event. All you can do is have it return a string. That will make the browser ask the user if they want to leave.

Just imagine if you could block this event! You could make a site that the user could never close! Just imagine all the popups you could make. There's no way browsers are going to allow this.

Answer 2

No. You can't stop people leaving a page if they want to.