Demo of Maximum allowed or limit selection of checkboxes by getElementsByName

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Try to select more than 3 checkboxes.

In place of limiting the number of selections, we can restrict based on the sum of values of the checkboxes.
We used getElementsByName here

<script type="text/javascript">
function chkcontrol(j) {
var total=0;
var elem = document.getElementsByName('ckb');
for(var i=0; i < elem.length; i++){
if(elem[i].checked==true){
total =total +1;}
if(total > 3){
alert("Please Select only three") 
elem[j].checked = false ;
return false;
}
}
} </script>

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DEMO : Limiting number of check boxes selected by user by getElementsByName