how to detect the Page Close Event with ASP.NET

 

I have a ASP.NET web app with a MasterPage and contents page, from the MasterPage when I click a MenuItem to open a new aspx Page. if I want to close the new page browser tab, I want to show a popup or a dialog that alert the user that he is closing the browser tab. I dont know how to detect the close browserTab button. I used the following code in the new aspx page: 

<script type="text/javascript">
    function CloseWindow() {
        alert('closing');
        window.close();
    }
</script>

new page code behind: 

protected void Page_Load(object sender, EventArgs e)
{
    Page.ClientScript.RegisterOnSubmitStatement(typeof(Page), "closePage", "window.onunload = CloseWindow();");
}

Thanx in Advantage.

This works perfect.

javascript detect browser close tab/close browser 

<body onbeforeunload="ConfirmClose()" onunload="HandleOnClose()">

var myclose = false;

function ConfirmClose()
{
    if (event.clientY < 0)
    {
        event.returnValue = 'You have closed the browser. Do you want to logout from your application?';
        setTimeout('myclose=false',10);
        myclose=true;
    }
}

function HandleOnClose()
{
    if (myclose==true) 
    {
        //the url of your logout page which invalidate session on logout 
        location.replace('/contextpath/j_spring_security_logout') ;
    }   
}

I had a lot of problems with this myself and the only thing that works is: "window.onbeforeunload" event from javascripts but the problem is this gets executed a lot more than when you'd expect. So basicly if your working with a master page etc I don't think it can be done.

I think it's best you try to approach this differently because else your closing message will show up to often.

You can handle this with javascript in your page.
First create a function: 

function closeMessage() {
    return "Are you sure you want to leave this page";
}

After that assign this method: 

window.onbeforeunload = closeMessage;

Please let me know if was helpfull

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