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

Posted on 2008-10-14
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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>

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Question by:brotherbill999
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Accepted Solution

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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.
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