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Javascript check all multiple checkbox groups

Posted on 2008-10-13
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Last Modified: 2010-04-21
Hello!

I'm using the script below to check all checkboxes in a group. This works for one group in a form when the checkboxes have the same id.

 How can I modify this for more than one group in the same form?

thanks
<script language ="javascript">
<!--
 
<!-- Begin
function Check(chk)
{
if(document.search1.Check_All.value=="Check All"){
for (i = 0; i < chk.length; i++)
chk[i].checked = true ;
document.search1.Check_All.value="UnCheck All";
}else{
 
for (i = 0; i < chk.length; i++)
chk[i].checked = false ;
document.search1.Check_All.value="Check All";
}
}
 
// End -->
</script>
 
***HTML***
 
<input name="colour_black" type="checkbox" id="check_list" value="1" />
<input name="colour_white" type="checkbox" id="check_list" value="1" />
 
<input type="button" id="Check_All" value="Check All"
onClick="Check(document.search1.check_list)">

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Question by:allanch08
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2 Comments
 
LVL 43

Accepted Solution

by:
David S. earned 1400 total points
ID: 22706193
IDs must be unique. Two elements in the same document may not have the same ID.

Perhaps this will help you: http://www.dynamicsitesolutions.com/javascript/check-all-or-none-checkboxes/
0
 

Author Closing Comment

by:allanch08
ID: 31505661
thanks kramivir, that's what I was looking for and the unique ID has cleared up another lingering question!
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