Solved

CustomValidaor and Client-side validation

Posted on 2009-04-13
3
204 Views
Last Modified: 2013-11-07
I have a text box that I need to run a custom validator on to make sure the max length isn't exceeded. The HTML for the TextBox and Validaor are below along with the Javascript validation function. I pretty much copied this out of an example on MSDN. it doesn't work. When I leave the TextBox I get a JS error: Microsoft JScript runtime error: 'Value.length' is null or not an object

Any help is greatly appreciated.
<asp:TextBox runat="server" ID="emer_phone_quantity" Width="30px" Height="20px" MaxLength="10" />

<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Phone Quantity length must be no greater than 10"

	Text="*" ControlToValidate="emer_phone_quantity" ClientValidationFunction="ValidateLength10" />
 

In the Page Head section:
 

	<script type="text/javascript">
 

		function ValidateLength10(args, event) {
 

			args.IsValid = (args.Value.length <= 10)
 

		}
 

	</script>

Open in new window

0
Comment
Question by:rschaeferhig
  • 2
3 Comments
 
LVL 6

Expert Comment

by:HarryNS
ID: 24131087
Change you javascript function to this,

function ValidateLength10(oSrc,args) {
     
                  args.IsValid = (args.Value.length <= 10)
 
            }
0
 
LVL 6

Accepted Solution

by:
HarryNS earned 250 total points
ID: 24131131
The code I have given above will work fine. But you have already defined the maxlength of the text box as 10,
<asp:TextBox runat="server" ID="emer_phone_quantity" Width="30px" Height="20px" MaxLength="10" />

Then why do you want this custom validation to be done?
0
 

Author Closing Comment

by:rschaeferhig
ID: 31569578
You're painfully right. I'm under a time constraint rewriting an ASP/VBScript app to .Net and I didn't even think about it. I just implemented what was in the original code...  Duhh..
0

Featured Post

What Is Threat Intelligence?

Threat intelligence is often discussed, but rarely understood. Starting with a precise definition, along with clear business goals, is essential.

Join & Write a Comment

Suggested Solutions

Just a quick little trick I learned recently.  Now that I'm using jQuery with abandon in my asp.net applications, I have grown tired of the following syntax:      (CODE) I suppose it just offends my sense of decency to put inline VBScript on a…
A long time ago (May 2011), I have written an article showing you how to create a DLL using Visual Studio 2005 to be hosted in SQL Server 2005. That was valid at that time and it is still valid if you are still using these versions. You can still re…
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

708 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

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now