Solved

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

Posted on 2008-10-14
1
1,854 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

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

In my daily work (mainly using ASP.net), I need to write a lot of JavaScript code. One of the most repetitive tasks I do are the jQuery Ajax calls. You know: (CODE) I don't know if for you it's the same, but for me is soooo tedious to write the …
In Part 1 (http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/A_7849-Hex-Maze.html) we covered the hexagonal maze basics -- how the cells are represented in a JavaScript array and how the maze is displayed.  In this part, we'…
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…

749 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