javascript: only allow 1 check per id property[SLOW RESOLUTION]

**lleemon** · Jun 3rd, 2004, 01:27 PM

I have a form with a number of rows and each row has a checkbox that will pass a value on. I also am having a different ID value for each checkbox unless it is a related row. Does anyone know if I can only allow 1 checkbox to be checked per unique ID?

You will see in my code below that I would only allow one row checked between Row1 and Row2 since they both have an ID of chkAdd[a]. Row3 and Row4 are fine since they only have one unique ID value.

If anyone could help I would be greatful.
Thanks in advance.

Code:

<%@LANGUAGE="VBSCRIPT" CODEPAGE="1252"%>
<html>
<head>
<title>ID Test</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script language="JavaScript">
function fnCompareCheckboxes(obj){
	var vTotalChd = 0;
	var vMax = document.frmUnMapped.chkAdd.length;

	for (var vIdx =0; vIdx < vMax; vIdx++){
		if (eval("document.frmUnMapped.chkAdd.checked") == true){
			vTotalCkd += 1;
		}
	}
	if (vTotalChd > 1){
		alert("1 Choice only for this");
		obj.checked = false;
	}
}
</script>
</head>

<body>
<form action="" method="post" name="frmUnMapped" id="frmUnMapped">
  <table width="650" border="1" cellspacing="0" cellpadding="0">
    <tr> 
      <td>Row1</td>
      <td><input name="chkAdd" type="checkbox" id="chkAdd[a]" value="1" onClick="fnCompareCheckboxes(this)"></td>
      <td>&nbsp;</td>
    </tr>
    <tr> 
      <td>Row2</td>
      <td><input name="chkAdd" type="checkbox" id="chkAdd[a]" value="2" onClick="fnCompareCheckboxes(this)"></td>
      <td>&nbsp;</td>
    </tr>
    <tr> 
      <td>Row3</td>
      <td><input name="chkAdd" type="checkbox" id="chkAdd[b]" value="3" onClick="fnCompareCheckboxes(this)"></td>
      <td>&nbsp;</td>
    </tr>
    <tr> 
      <td>Row4</td>
      <td><input name="chkAdd" type="checkbox" id="chkAdd[c]" value="4" onClick="fnCompareCheckboxes(this)"></td>
      <td>&nbsp;</td>
    </tr>
  </table>
</form>
</body>
</html>

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