# Javascript: calculating form **URL:** \ **Category:** Uncategorized\ **Created:** [February 21, 2008, 10:45pm UTC](https://forum.kirupa.com/t/javascript-calculating-form/252639 "2008-02-21T22:45:09Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Limitlis](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/limitlis/32/788_2.png) [@Limitlis](https://forum.kirupa.com/u/Limitlis)\ **Post date:** [February 21, 2008, 10:45pm UTC](https://forum.kirupa.com/t/javascript-calculating-form/252639/1 "2008-02-21T22:45:09Z")
Hi. Im creating a pretty simple form with values that need to be calculated. I got that portion working… sorta. Right now it captures the current value in the total field to add the next value to it. The problem is that even if I go back to a previous cell and make no change it will add to the total again. Do I have to capture the qty before a change and after to see if a change has been made? Here’s my code so far: ```auto Untitled Document
$0.25
$0.12
$5.00
Total
``` Im just wondering what the best method to go about this is. Just off the top of my head It seems like I would have to capture the qty (value) onFocus then check against the value onBlur then make the necessary calculation. Any thoughts? Thanks in advance.