# Catch original form value for comparing to submitted value
**URL:** https://forums.knack.com/t/catch-original-form-value-for-comparing-to-submitted-value/11660
**Category:** Ask Developers
**Created:** [December 3, 2021, 5:42pm UTC](https://forums.knack.com/t/catch-original-form-value-for-comparing-to-submitted-value/11660 "2021-12-03T17:42:41Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@RobinB](https://forums.knack.com/u/RobinB)
#### Post date: [December 3, 2021, 5:42pm UTC](https://forums.knack.com/t/catch-original-form-value-for-comparing-to-submitted-value/11660/1 "2021-12-03T17:42:41Z")
From a Form, I need to catch a particular field value BEFORE the form is submitted so that I can compare it to the submitted value and do something with the difference (ie original value was 20, new value is 15, I am going to do something with 5).
I can do the After, but not the Before.
I am listening on the view render, but there is no record yet for me to grab. Am I listening to the wrong thing? This is a single record form, not a inline-editable table.
```auto
$(document).on('knack-view-render.view_336', function(event, view, data) {
//Pausing to let the records load doesn't help
var MyOriginalPortion = record["field_100"]; // THIS LINE DOES NOT WORK
console.log(MyOriginalPortion);
$(document).on('knack-form-submit.view_336', function(event, view, record) {
var PaymentRecordID = record.id;
var ThisActivityID = record["field_199"]; // ActivityID field in Payments Table
var MyNewPortion = record["field_100"]; // THIS LINE WORKS FINE
console.log("Mew Portion: " + MyNewPortion);
// bla bla bla
```
---
### Author:  [@BradStevens](https://forums.knack.com/u/BradStevens)
#### Post date: [December 5, 2021, 9:51pm UTC](https://forums.knack.com/t/catch-original-form-value-for-comparing-to-submitted-value/11660/2 "2021-12-05T21:51:09Z")
Use the ‘data’ variable returned inside your view render (not ‘record’).
`var MyOriginalPortion = data.field_100;`
---
### Author:  [@RobinB](https://forums.knack.com/u/RobinB)
#### Post date: [December 6, 2021, 2:27pm UTC](https://forums.knack.com/t/catch-original-form-value-for-comparing-to-submitted-value/11660/3 "2021-12-06T14:27:41Z")
> [@BradStevens](#):
>
> data.field\_100
Yep that was what I needed! Thanks!