# Advanced Logic/Javascript on a matrix field
**URL:** https://community.feathery.io/t/advanced-logic-javascript-on-a-matrix-field/591
**Category:** Support
**Created:** [April 7, 2024, 1:15am UTC](https://community.feathery.io/t/advanced-logic-javascript-on-a-matrix-field/591 "2024-04-07T01:15:55Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@KrisB](https://community.feathery.io/u/KrisB)
#### Post date: [April 7, 2024, 1:15am UTC](https://community.feathery.io/t/advanced-logic-javascript-on-a-matrix-field/591/1 "2024-04-07T01:15:55Z")
I have a matrix field with 3 rows and 4 columns. I’d like to run some custom logic (via Javascript) on that field, but unsure how to do so.
I usually use the Rule Builder to give me some direction (and see what JS code it writes), but that tool is only allowing me to select from [“is filled”; “is empty”].
Would love some example JS code that details, for example, if for Row2 the user selected Option/Column 3.
Thx
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### Author:  [@summep](https://community.feathery.io/u/summep)
#### Post date: [April 7, 2024, 5:24am UTC](https://community.feathery.io/t/advanced-logic-javascript-on-a-matrix-field/591/2 "2024-04-07T05:24:05Z")
Hi Kris, I have added a logic rule `Matrix Example` in the `Stock Comp Assessment` form as a reference - you would first need to obtain the question id for each of the rows (already included in the code comments), and use that to check if a certain option is selected with `includes()`.
Please let us know if this works for what you would like to achieve. Thank you.