one checkbox selection

[Joja]

I have 3 checkboxes but the user should select just one.
How to block multiple checkbox selection ?

Joja

 

[Bart Van der Donck]

I have 3 checkboxes but the user should select just one.
How to block multiple checkbox selection ?

<form>
<input type="checkbox" name="C1" value="1" onClick="only1(this.name)">
<input type="checkbox" name="C2" value="2" onClick="only1(this.name)">
<input type="checkbox" name="C3" value="3" onClick="only1(this.name)">
</form>
<script type="text/javascript">
var checkelements = new Array("C1","C2","C3")
function only1(which)
{
for(var i=0; i<checkelements.length; ++i) {
if (document.forms[0].elements[checkelements].name != which)
document.forms[0].elements[checkelements].checked = false;
}
}
</script>

I'm not sure why you don't want

<input type="radio" name="R" value="1">
<input type="radio" name="R" value="2">
<input type="radio" name="R" value="3">

Hope this helps,