Solved

Listbox validation problem in Javascript and asp.net

Posted on 2010-11-26
2
633 Views
Last Modified: 2012-05-10
I got this custom validator which I want to check whether this left listbox is empty and ask user to add items from the 2nd right listbox next to it. However, I got an javascript error when I put this custom validator in my aspx.  If I take away the validator from html, adding items works.

if the validator exists in the html aspx,  adding items does not work. Please help.

   <asp:CustomValidator ID="cvChosenList" runat="server" Display="Dynamic" ErrorMessage="Managed By is required" ClientValidationFunction="assignedAreaCheck"  Width="156px">Managed By is required.</asp:CustomValidator>

and javascript


<script language="JavaScript" type="text/javascript">

function assignedAreaCheck(sender, args)
{
   var listBox = document.getElementById('lstChosenManaged');
   
   if (listBox.length>0)
   args.IsValid = true;
   else
   args.IsValid = false;

}
            
</script>

0
Comment
Question by:spiral
2 Comments
 
LVL 32

Accepted Solution

by:
Erick37 earned 500 total points
ID: 34217911
What is the script error you are getting?

Maybe use ClientID to properly reference the Listbox:

var listBox = document.getElementById('<%=lstChosenManaged.ClientID%>');
0
 

Author Comment

by:spiral
ID: 34227528
thanks Erick37.

I got an error object not found. After changing the js function, the error disappears.

I also need to change the causevalidation property of my add button to false so the validation logic will not kick in when I add items.
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A quick way to get a menu to work on our website, is using the Menu control and assign it to a web.sitemap using SiteMapDataSource. Example of web.sitemap file: (CODE) Sample code to add to the page menu: (CODE) Running the application, we wi…
International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

792 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question