Question

What would I need to add in order for this to validate according to how many checkboxes have been selected? I want the user to select at least two checkboxes before submission of data. Here is my Javascript code:

<script type="text/javascript" language="JavaScript">

function checkCheckBoxes(theForm) {
    if (
    theForm.Conservatives.checked == false &&
    theForm.Labour.checked == false &&
    theForm.LiberalDemocrats.checked == false) 
    {
        alert ('Choose At Least Two Parties Who Will Be Standing For This Election');
        return false;
    } else {    
        return true;
    }
}

</script> 

The current Javascript code only validates if any checkboxes have been selected or not, but I want it to validate for two checkboxes.

Answer 1

Just count how many are checked and see if it’s less than 2.

function checkCheckBoxes(theForm) {
    var cnt = 0;
    if (theForm.Conservatives.checked) ++cnt;
    if (theForm.Labour.checked) ++cnt;
    if (theForm.LiberalDemocrats.checked) ++cnt;
    if (cnt < 2) {
        alert ('Choose At Least Two Parties Who Will Be Standing For This Election');
        return false;
    } else {    
        return true;
    }
}