Javascript function does not return value

Question

4.00/5 (1 vote)

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I have a button (authorise) in master page, which raises event. Then based on child page, I authorise the ticket. However when someone clicks on authorise button, I have to confirm as well and then disable authorise button to avoid multiple clicks.

Here is HTML in masterpage

ASP.NET

<asp:ImageButton ID="imgAuthorise" runat="server" ImageUrl="~/Images/Authorise.png" TabIndex="-1" ToolTip="Authorise" Visible="False" OnClientClick="return ToggleButton()" />

JavaScript Method

JavaScript

function ToggleButton() {
            var button = document.getElementById(event.srcElement.id);
            var returnValue = true;

            if (button.disabled) {
            }

            else {
                var check = confirm('Are you sure that you want to authorise?');
                if (check) {
                     button.disabled = true;
                    returnValue = true;
                }
                else {
                     button.disabled = false;
                    returnValue = false;
                }
            }
            return returnValue;
        }

Now, if I comment lines with button.disabled. function returns proper value and child page executes event successfully. However, if I place button.disabled lines back, then child page does not subscribe to event.

Can anyone help me please?

Posted 7-Aug-12 11:09am

amuneeb

Updated 7-Aug-12 11:12am

Wes Aday

v2

Add a Solution

Comments

Sergey Alexandrovich Kryukov 7-Aug-12 17:40pm

Did you try to execute it under debugger? Do you have the JavaScript debugger, functional?
--SA

3 solutions

Solution 4

hiii,

this is your master page code where authorise button on master page hope this will ans.

XML

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
     <script type="text/javascript">
         function ToggleButton() {
             var button = document.getElementById('<%= imgAuthorise.ClientID %>');
             var returnValue = true;
             if (button.disabled) {
             }

             else {
                 var check = confirm('Are you sure that you want to authorise?');
                 if (check) {

                     returnValue = true;
                 }
                 else {

                     returnValue = false;
                 }
             }
             return returnValue;
         }


    </script>
    <title></title>
    <asp:ContentPlaceHolder ID="head" runat="server">

    </asp:ContentPlaceHolder>
</head>
<body>
    <form id="form1" runat="server">
    <div>
     <asp:ImageButton ID="imgAuthorise" runat="server" ImageUrl="~/Images/Authorise.png" TabIndex="-1" ToolTip="Authorise"  OnClientClick="return ToggleButton()" />
        <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">

        </asp:ContentPlaceHolder>
    </div>
    </form>
</body>
</html>

Posted 7-Aug-12 23:40pm

Ganesh Nikam

Updated 8-Aug-12 0:19am

v2

Comments

amuneeb 8-Aug-12 5:59am

I cannot put authorise button in the child page. That totally makes masterpage useless. Masterpage is suppose to give you advantage of placing controls once. If I am placing button in child page. I will have to change every child page and I have around 50 child pages.

Solution 1

Either run it under debugger or sandwich in try-catch block to see what happens. Most likely, the button element is not found, and the attempt to dereference non-initialized object causes exception.

—SA

Posted 7-Aug-12 11:39am

Sergey Alexandrovich Kryukov

Comments

Sergey Alexandrovich Kryukov 7-Aug-12 21:18pm

OP commented:

I have tried it in debugger, no joy. event on server side does not get fired.

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amuneeb · Accepted Answer · 2012-08-08T05:53:00

Solution 5

Hi!
Thanks for the help. I found solution
Check this link
It works perfectly in my situation.

Cheers

Posted 8-Aug-12 5:53am

amuneeb