Roundup total and multiply again jquery calculator

问题

I have a few modifications I need for my cost calculator:

1. Is there a way to add a Math.celi to the no of cans so it rounds up to the nearest whole number, providing the minimum cans needed?

2. What ever the minimum required cans are, can the cost reflect that by multiplying by 18.23 and giving the real amount?

   $('input').keyup(function () { // run anytime the value changes
   
   
    var firstValue = parseFloat($('#width').val()); // get value of field
    var secondValue = parseFloat($('#height').val());
    var thirdValue = parseFloat($('#per-can').val()); // convert it to a float
    var forthValue = parseFloat($('#cost').val());
    var fithValue = parseFloat($('#size').val());
   
    var canCount = firstValue * secondValue / thirdValue;
   
    $('#added').html((canCount * forthValue).toFixed(2));
    $('#cans').html(canCount.toFixed(2));
   
    if (Math.ceil(canCount) < 2) {
    $('#error').html("Need at least 1!");
    } else {
    $('#error').empty();   
    }
   
    });
   

http://jsfiddle.net/5xzSy/504/ thanks

来源：https://stackoverflow.com/questions/25803495/roundup-total-and-multiply-again-jquery-calculator