Javascript check all multiple checkbox groups

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

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?

<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";


for (i = 0; i < chk.length; i++)

chk[i].checked = false ;

document.search1.Check_All.value="Check All";



// End -->



<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"


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Question by:allanch08
LVL 42

Accepted Solution

David S. earned 350 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:

Author Closing Comment

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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