Solved

CustomValidaor and Client-side validation

Posted on 2009-04-13
3
214 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
[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
  • 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

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

This article discusses the difference between strict equality operator and equality operator in JavaScript. The Need: Because JavaScript performs an implicit type conversion when performing comparisons, we have to take this into account when wri…
This article discusses how to implement server side field validation and display customized error messages to the client.
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…

710 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