Onkey up第二个输入值不应大于第一个值

Question

I have three input values one for payment, second for advance payment and third for remaining balance from actual_payment to advance_payment.

If the advance payment is greater than acutal payment, the advance payment should not be enter.

<input type="text" id="actual_payment" value="">
<input type="text" id="advance_payment" value="">
<input type="text" id="balance_payment" value="">

How to compare advance payment should not greater actual payment and remaining balance should not be greater than actual payment and advance payment.

Here is my jquery code

    $(function(){
        $("#advance_payment").on('keyup', function(){
            var actual_payment = $("#actual_budget").val();


            $("#balance_payment").val(actual_payment-$(this).val());    
            if ($("#advance_payment").val()>$("#actual_budget")) {
                alert("sorry the advance payment should be less actual payment");
            }

        })  
        });

Answer 1

The following returns a string:

$("#actual_budget").val()

You probably want to use the parseFloat() function:

parseFloat($("#actual_budget").val());

That will apply to any field that you retrieve as a decimal number.