Question

I use this code to calculate the sum : http://jsfiddle.net/QmTNZ/2/

I want to modify it, to show 0 when there is no valid quantity or it is empty and not “NaN”

I want also to format the Sum to have only 2 numbers after the comma.

Help (I’m beginner in jquery).

Answer 1

You can use the isNaN function to check whether a number is actually a number or not:

if(isNaN(sum)) {
    //Show 0
}
else {
    //Show the value
}

To round the sum to 2 decimal places, you could do something like this:

Math.round(sum * 100) / 100;

Here is an updated fiddle showing how it could work.