JQuery Validate: How do I add validation which checks the sum of multiple fields?

Question

I'm trying to use jQuery validation for a dynamic form I'm setting up.

In some cases this form contains a set of input boxes which are suppose to total 100.

An example might be:

Please indicate what percentage of students are in each grade?
Grade 9: TextBox1
Grade 10: TextBox2
Grade 11: TextBox3
Grade 12: TextBox4

I want to verify that TextBox1 + TextBox2 + TextBox3 + TextBox4 = 100%.

How do I go about this?

Thanks!

Answer 1

<script>
$(document).ready(function(){
    $("#some-form").validate({

        rules: {
            TextBox1: {
                required: true,
                number: true,
                min: 0,
                max: 100,
            },
            TextBox2 : {
                required: true,
                number: true,
                min: 0,
                max: 100,
            }
            TextBox3 : {
                required: true,
                number: true,
                min: 0,
                max: 100,
            }
            TextBox4 : {
                required: true,
                number: true,
                min: 0,
                max: 100,
            }

        },
        submitHandler: function(form){
            var total = parseInt($("#TextBox1").val()) + parseInt($("#TextBox2").val()) + parseInt($("#TextBox3").val()) + parseInt($("#TextBox4").val());
            if (total != 100) {
                $(".error").html("Your total must sum to 100.")
                return false;
            } else form.submit();
        }

    });
});

</script>

Stolen and edited from here.