Solved

RequiredFieldValidator on dropdownlist

Posted on 2004-09-23
7
1,321 Views
Last Modified: 2008-02-01
How can I force web users to explicitly select an option on the dropdowlist?  By default, dropdownlist selects the one appears.  It makes RequiredFieldValidator on dropdownlist useless.  

Do I miss something about the Validator?  If I can not make the validator to work,  I can do dynimic validation on the server side but I don't know the best practice to do client validation.

Please help.

Biang
0
Comment
Question by:Jinghui Li
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2
7 Comments
 
LVL 15

Expert Comment

by:praneetha
ID: 12137951
i guess since something is allready selected...it won't fire the required field validator...

you can instead write javascript to check if the dropdownlist index chnaged
0
 

Author Comment

by:Jinghui Li
ID: 12138263
I am inspired by this article in google.  Use CompareValidator with NotEqual to the default selected value.

http://www.google.com/groups?q=requiredfieldvalidator,+dropdownlist&hl=en&lr=&ie=UTF-8&selm=%23pCp6gYgBHA.1640%40tkmsftngp07&rnum=10
0
 
LVL 15

Expert Comment

by:praneetha
ID: 12138293
yep that's a good idea..thank u for sharing
0
Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

 
LVL 15

Accepted Solution

by:
praneetha earned 500 total points
ID: 12143804
here is the solution using required field validator....

InitialValue="0" - in required field validator - is the key thing..let "0" be the value of first element which is by default selected in dropdownlist...



<asp:RequiredFieldValidator id="RequiredFieldValidator1" style="Z-INDEX: 107; LEFT: 208px; POSITION: absolute; TOP: 224px"
                        runat="server" ErrorMessage="RequiredFieldValidator" ControlToValidate="DropDownList1" InitialValue="0"></asp:RequiredFieldValidator>

                  <asp:DropDownList id="DropDownList1" style="Z-INDEX: 106; LEFT: 208px; POSITION: absolute; TOP: 184px"
                        runat="server" Width="96px">
                        <asp:ListItem Value="0">Select</asp:ListItem>
                        <asp:ListItem Value="1">1</asp:ListItem>
                        <asp:ListItem Value="2">2</asp:ListItem>
                  </asp:DropDownList>
0
 

Author Comment

by:Jinghui Li
ID: 12144079
I believe ASP.NET should have designed RequiredFieldValidator to handle this normal scenario.  Thank you  praneetha for finding it out.  I think th trick here is the setting of InitialValue.  Well done!
0
 
LVL 15

Expert Comment

by:praneetha
ID: 12144148
thank u and you are welcome..i learnt something new too...

have a good weekend
0

Featured Post

PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

Question has a verified solution.

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

Lots of people ask this question on how to extend the “MembershipProvider” to make use of custom authentication like using existing database or make use of some other way of authentication. Many blogs show you how to extend the membership provider c…
This article discusses the ASP.NET AJAX ModalPopupExtender control. In this article we will show how to use the ModalPopupExtender control, how to display/show/call the ASP.NET AJAX ModalPopupExtender control from javascript, how to show/display/cal…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

751 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