javascript - Capture the result of window.onbeforeunload - Stack Overflow

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I have a scenario, I have to save the changes when user clicks yes on window.onbeforeunload for that I need to submit the form and nothing should be happen when selected no.

Any help is greatly appreciated.

I have tried this:

window.onbeforeunload= function(){
    var r = confirm("Are you sure you want to leave this page?");
    if (r == true) {
        readForm.action = '/SREPS/read.do' ;
        readForm.submit();
    }else{
        return false;
    }
}

It did not worked 100% when ever we hit Cancel during window.confirm another dialog appears saying that message from web page false asking for confirmation leave this page and stay on this page. In this case if the user selects leave this page. I am not able to submit the form.

I have a scenario, I have to save the changes when user clicks yes on window.onbeforeunload for that I need to submit the form and nothing should be happen when selected no.

Any help is greatly appreciated.

I have tried this:

window.onbeforeunload= function(){
    var r = confirm("Are you sure you want to leave this page?");
    if (r == true) {
        readForm.action = '/SREPS/read.do' ;
        readForm.submit();
    }else{
        return false;
    }
}

It did not worked 100% when ever we hit Cancel during window.confirm another dialog appears saying that message from web page false asking for confirmation leave this page and stay on this page. In this case if the user selects leave this page. I am not able to submit the form.

• javascript
• jquery
• jquery-events

Share Improve this question Follow edited Sep 23, 2022 at 17:59 Brian Tompsett - 汤莱恩 5,8937272 gold badges6161 silver badges133133 bronze badges asked May 7, 2014 at 15:56 HarishHarish 45533 gold badges77 silver badges2121 bronze badges 3

• 1 possible duplicate of How to capture browser close event and make a request to web service method on that event through javascript – Denys Séguret Commented May 7, 2014 at 15:57
• I have posted my answer below – Harish Commented May 7, 2014 at 16:36
• @Harish: Don't post it as an answer if it does not answer/solve the question. – gen_Eric Commented May 7, 2014 at 20:04

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1 Answer 1

Sorted by: Reset to default 6

You cannot use your own dialog in onbeforeunload. The only thing you can do is return a string to be displayed (on some browsers). You cannot stop the browser from leaving, only the user can control that.

What you can do is the following:

window.onbeforeunload = function(){
    return 'Are you sure you want to leave this page?';
};

This will ask the user if they want to leave or not. Then you can use the onunload event to run a function when they leave. From there, you can make a "synchronous" AJAX request to submit the form.

window.onunload = function(){
    var request = new XMLHttpRequest();
    request.open('POST', '/SREPS/read.do', false);
    request.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');

    request.send(new FormData(readForm));
};

If you are using jQuery, you can do:

window.onunload = function(){
    $.ajax({
        url: '/SREPS/read.do',
        type: 'post',
        async: false,
        data: $(readForm).serialize()
    });
};

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