How to call javascript function from asp.net code behind function

Question

javascript code

function logoutPop() {
       var a = confirm("are you sure !");
       if (a = true)
           return true;
       else return false;
    }

aspx file

    protected void Menu1_MenuItemClick(object sender, MenuEventArgs e)
        {
            string selectedItem = e.Item.Value;
            if (selectedItem == "logout")
            {
// here i want to call javascript function logoutPop() and check return value. if true want to redirect login page else nothing.

Is there any way to do this . I tried scriptmanager but not success . Please help . Thank you.

possible duplicate of Reference: Why does the PHP (or other server side) code in my Javascript not work? — Quentin
– Quentin, Commented Jul 19, 2013 at 11:18
What kind of menu are you using? May be you can achieve this by confirming on client side first & raising server side event on YES. — yogi
– yogi, Commented Jul 19, 2013 at 11:19

Jalpesh Vadgama · Accepted Answer · 2013-07-19 12:25:15Z

1

Use ClientScriptManager.RegisterClientScriptBlock

See the following link. http://msdn.microsoft.com/en-us/library/btf44dc9.aspx

Regards,

answered Jul 19, 2013 at 12:25

Jalpesh Vadgama

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iJade · Accepted Answer · 2013-07-19 11:20:56Z

0

As far as i know you can't do that.You can run javascript code before page load or after the server side code has been executed.You can't make javascript work in between c# code execution and then return back to c#.

answered Jul 19, 2013 at 11:20

iJade

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Abhishek Jain · Accepted Answer · 2013-07-19 13:58:57Z

This is not possible with ASP.NET Menu Control to register a javascript method on click events.

I hope i understood your problem right! You want a Confirm box on one of the Menu Items which needs to be displayed on the Client Side(Browser) without a postback.

This can only be achieved by playing around with the DOM using jQuery after the document gets rendered.

jQuery Code:

$(document).ready(function () {
        $('#MainContent_mTest a').each(function () {
            var anchorHtml = $(this).html();
            if (anchorHtml == 'logout') {
                var clickEvent = this.onclick;
                this.onclick = "";
                $(this).bind('click', function (ev) {
                    if (confirm("Are you sure !")) {
                        clickEvent();
                    }
                    else {
                        return false;
                    }
                });
            }
        });

I hope this solves your problem...

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