使用我的自定义弹出窗口覆盖onbeforeunload弹出窗口

Question

Is there any way that i can override onbeforeunload popup ?

I tried with below but it does't work:

if($('body').hasClass('admin')){
    window.onbeforeunload = function(event) {
        notifySaveChangesUser(event);   
        //return null;
        //event.returnValue = "Say";
    };
}

function notifySaveChangesUser(event){
    //Doing some stuff here
}

Answer 1

This question has been already answered here .

TL;DR: You can customize message by returning the desired string from the handler:

window.onbeforeunload = function() {
    return "You have some unsaved changes";
};

See the answer above for more details and browser quirks.