`TextInput` component not handling events during the initial life cycles about react-admin

[adguernier]

Thanks for this report and the sandbox 🙏

However, tweaking the reproductible react-admin-sanbox by moving the document.querySelector('input[id="username-ra"]'); before the useEffect solves the issue you describe.

const raInput = document.querySelector('input[id="username-ra"]'); // it works
  useEffect(() => {
      ...

Knowing that the React way to get an element is to use useRef, I wonder if using document.querySelector instead of a ref could cause this issue (although for now , <TextInput> does not propagate to ref). 🤔

All things considered, for me this use case is unreliable to properly investigate and qualify this issue.
May you consider providing a project repository using the Cypress tests which lead to the issue you describe? Thanks

[ylkhayat]

@adguernier you're absolutely correct, but I am not sure how did you make it work with a ref, that's definitely the first thing I have tried, so I had to hack it in somehow with the document.querySelector. I even tried with inputRef and it didn't work. Check the console.log() in the upcoming screenshot. But yeah if you only tried it with the document.querySelector then it's the same case.

And this is probably because of the useInput used in the component replaces the ref coming from the props and put in the ref coming in from react-hook-form hook. This could be solved by a merging of refs or something!

Note That!

And also regarding moving the document.querySelector line outside of the useEffect, it defies the purpose of this test, because the issue here is about handling events during the very initial life cycles. If you simply move it up one level then you will start typing exactly one event later, this case is when the return of the query selector becomes available but the useEffect diff didn't yet get the new value. But by putting in the querySelector in the useEffect it's a dynamic fetch (kinda).

Please have a look at the screen shots attached below.

Inside useEffect	Outside useEffect
Started typing at 2!	Started typing at 3!!

So I believe the issue is not about the retrieval of the component but rather the logic being handled inside the TextInput that receives the very first events from the browser but does not handle them properly!

Thanks for looking into this! And happy to help out!

[fzaninotto]

Thanks for your report and the reproduction, which allows us to dig further.

After further inspection, it seems that the problem isn't linked to the onChange handler, which works fine in react-admin's TextInput, but to a reset of the form values on mount (or shortly after)

I tested it as follows:

1. Open the CodeSandbox in full page (https://56pg7h-5173.csb.app/)
2. Open the devtools, and find react-admin' useInput in the sources panel
3. Add a breakpoint in useInput's onChange handler
4. Refresh the screen

Initially, all 3 inputs have the first letter typed in ('a'), but after going one step further, the first 2 inputs have the correct value ('a-') but the third one only has '-'. This tends to show that react-admin resets the form a bit too late.

React-admin's Form sets the form default value based on the current RecordContext. The last time we've touched this mechanism is in #8911, nine months ago, and it was released in 4.11.0. There is no react-admin reason why it used to work on your side with a react-admin version > 4.11 and then stopped working.

So I tend to think it's a react-hook-form regression. To properly test it, you should set default values in your standalone RHF input.

Also, this makes me think that it doesn't make sense to use react-admin's Form in LoginForm instead of react-hook-form directly. We need none of the boilerplate of the Form component, which is designed with the use case of record forms.

[ylkhayat]

@fzaninotto But this (LoginForm) is a black box to us, we don't have access to the LoginForm provided from react-admin and we'd like to keep using the built in form, without overriding the loginPage prop passed to the AdminUI wrapper, we just use it as it is.

Will this be handled from react-admin's side to simplify the LoginForm usage as you mentioned in an upcoming version?