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Javascript Select/Deselect checkbox

Posted on 2009-05-13
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Last Modified: 2012-05-06
I have a list of checkboxes.  I already have a code that does Select/Deselect all.  Pretty much all that code does is toggle the status.  

What I need is a true Select/Deselect all code.

So when you check the box to Select All, if any boxes are currently checked, it would leave them alone.  Any boxes that aren't checked, it would check them.  

Same for Deselect.  If you uncheck the box, then any boxes that are currently checked would uncheck.  Any boxes that are currently unchecked would remain unchecked.
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Question by:nikinik
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Expert Comment

by:Jonah11
ID: 24377281
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Author Comment

by:nikinik
ID: 24378801
That code doesn't seem complete or well laid out.  I cannot get it to work.
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Expert Comment

by:Jonah11
ID: 24378872
paste in everything you have so far.  ill fix it.
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Author Comment

by:nikinik
ID: 24379051
I have this and it works....but it's individual buttons to select all and deselect all.  I really would rather it just be one checkbox to select all or deselect all.  


<SCRIPT LANGUAGE="JavaScript">
function checkAll(field)
{
for (i = 0; i < field.length; i++)
	field[i].checked = true ;
}
 
function uncheckAll(field)
{
for (i = 0; i < field.length; i++)
	field[i].checked = false ;
}
 
</script>
 
<input type="button" name="CheckAll" value="Select All" onClick="checkAll(document.tstest.bApproved)">&nbsp;
<input type="button" name="UnCheckAll" value="Deselect All" onClick="uncheckAll(document.tstest.bApproved)">

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Accepted Solution

by:
Jonah11 earned 500 total points
ID: 24379320
click on bottom checkbox
<form name="myform" action="checkboxes.asp" method="post">
<b>Your Favorite Scripts & Languages</b><br>
<input type="checkbox" name="list" value="1">Java<br>
<input type="checkbox" name="list" value="2">Javascript<br>
<input type="checkbox" name="list" value="3">Active Server Pages<br>
<input type="checkbox" name="list" value="4">HTML<br>
<input type="checkbox" name="list" value="5">SQL<br>
 
<input type="checkbox" name="checkUncheck" onChange="updateChecks(document.myform.list, this)">
</form>
 
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
function updateChecks(field, controllerCheckbox) {
	var checkValue = controllerCheckbox.checked;
	for (i = 0; i < field.length; i++) {
		field[i].checked = checkValue ;
	}
}
//  End -->
</script>

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Author Comment

by:nikinik
ID: 24379461
I copied and pasted your code directly and it doesn't work...

http://dev.c2trak.clickclaims.com/test.asp
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Expert Comment

by:Jonah11
ID: 24379538
that is not my code.  go to view source and compare it with whats above.
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Author Comment

by:nikinik
ID: 24379633
I was able to modifiy the code and get it working.
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Expert Comment

by:Jonah11
ID: 24379663
ok glad i could help.  but if you select all on that code, paste it into a blank notepad, and save it as test.html, it will work.  something must have happened when you put the code on your asp page.
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