Leading Zeros are Dropped?

Question

I have a JavaScript question, and although this is a Java Forum, I'm sorry but I don't know where else to post this.
I have a form where a user enters a 3-digit number. The code takes the number and increments it by 1 as long as the number entered is not 999.
The problem is that if the number entered by the user is, for example, 023, the code increments the number to 24, which is right, but it drops the leading 0. It should increment the number to show 024.
Can someone please tell me how to fix this problem? My code is below:
     function btn()
          var num=document.frm.txt.value
               if (num == 999) {
                    alert("You have reached the maximum number of " + num)
               else {
                    num++
                    alert("The new number is " + num)
     }

Answer 1

the troubel you are encountering is in the variant data type itself, if you treat it like anumber it tries to be a number, but you can also treat it like text--so you have the problem, it doesn't know you want leading 0's. What about leading spaces?
1st - you will need to check the length of the string before you increment it and turn it into a number.
2nd - increment the number
3rd - concatinate the number to 3 0's myNumber := "000" + (myNumber);
4th - take the right most 3 digits of the string.
Hope this helps you, it is a common problem when you are using variants..