[Feature]: Suport set field errors programmatically

[cjoecker]

What is the new or updated feature that you are suggesting?

I want to set an error on the client side without needing Zod for that.

Something like a setCustomError function in the useFormContext hook will be great.
I can then call it like setCustomError("myFieldName", "customError").
We would then need also need a resetCustomError function.

Why should this feature be included?

I have the field A and when it is filled, it calls an external API.
Based on the response of the API, I want to be able to set an error to another field B using the result of the API call together with the value of the field B

[jason-rb2]

I agree.
eg: check vat number
When i use fetcher.load or fetcher.submit to validate the vat input when it loses focus(onBlur), validationError not working because i don't submit the whole form.
So i also need one feature like setFieldError

[airjp73]

This sounds reasonable to me. Would you mind opening a PR?

[cjoecker]

@airjp73 I will do a PR. Do you have some guidance on how to start the project? I just clone it but I'm not sure how to build the library and test the changes

[cjoecker]

@airjp73 are you still maintaining the library? I would like to open a PR but I struggled to start the project, know what is the testing approach etc.

[airjp73]

Hi! I am but I don't have much time to work on new features. You'll likely need to add a function to the form store and access that in the useFormContext hook. The tests are in the test-app using Cypress -- create a route for the test and then use it in one of the existing test files (or make a new one either is fine here).

The most basic version of this feature probably only touches a couple files.

All the building, testing, etc should be doable from the root of the monrepo. But you can probably run some commands from within specific packages too.