Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

How to find control in asp.net javascript client custom validator

Posted on 2008-10-14
1
Medium Priority
?
1,859 Views
Last Modified: 2012-06-27
Goal is to validate on the client side (javascript) that a listbox has either no selections or at least a minimum number of rows selected.
I can sneak in the minimum number of rows, but need assistance finding the listbox, given the source or args parameters.


<script type="text/javascript" >
  function cvAnswer_7_2_4MinLengthListBox_ClientValidate(source, args) {
    alert(source.id);
    alert(args.ControlToValidate);
    alert(source.ControlToValidate);
    alert('zero');
    var regex = /^\D*\d+_(\d+)_/;
    var result = source.id.match(regex);
    var minLength = parseInt(result[1], 10);
    var lbx = document.getElementById(source.id);
    alert(lbx);
    alert(lbx.options);
    alert(lbx.options.length);
    var selectedCount = 0;
    alert('two');
    var i;
    alert('three');
    for (i = 0; i < lbx.options.length; i++) {
      if (lbx.options[i].selected) {
        selectedCount++;
      }
    }
    alert('four');
    args.IsValid = (selectedCount >= minLength);
    alert('five');
    alert(args.IsValid)
  }
</script>

Open in new window

0
Comment
Question by:brotherbill999
[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
1 Comment
 

Accepted Solution

by:
brotherbill999 earned 0 total points
ID: 22720587
To find listBox, use: source.controltovalidate
Note that on Server side, it is ControlToValidate, but on javascript side it is all lowercase.
0

Featured Post

Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

Question has a verified solution.

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

I've been trying to accomplish this for a while and it just struck me yesterday how to accomplish this task. I have done searches all over the internet looking for ways to email pages from my applications and finally I have done it!!! Every single s…
In this blog, we’ll look at how improvements to Percona XtraDB Cluster improved IST performance.
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…

597 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