I found many scripts to limit max number of checkboxes that can be selected in a page with javascript, for example here is one:
http://www.plus2net.com/javascript_tutorial/checkbox-limit.php
However I don't need a specific number, but a VARIABLE one.
This means that I need to have a percentage limit instead of just a number.
For example, limit user selection to max 30% of the checkboxes in the page.
Any help on how to achieve this is highly appreciated!
To alter that script to be a percentage vs. a fixed total you just need to take 30% of the total number of elements.
function chkcontrol(j) {
var length = document.form1.chb.length;
// Max number allowed checked is 30% of the total
var max = Math.round(length * .3);
var total = 0;
for(var i = 0; i < length; i++){
if(document.form1.ckb[i].checked){
total = total + 1;
}
if(total > max){
alert("Please Select only three")
document.form1.ckb[j].checked = false ;
return false;
}
}
}
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