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Fix NumberControl validation #34128

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@stokesman stokesman commented Aug 17, 2021

This includes two changes to NumberControl behavior:

  • does not call onChange with invalid values
  • clamps invalid values to within range on blur

The changed behaviors are covered by a couple of new unit tests. I'd manually verified the behavior before writing the tests and so was quite surprised that the unit tests would not pass. I never pinpointed the issue but, on a hunch, I tried memoizing the reducers used in NumberControl and InputControl and that got the tests passing as expected. Since it seems better to have the reducers stable (so they don't run twice per render) the reducer for UnitControl is also made so.

How has this been tested?

Manually and unit tests. Part of the manual testing was

Types of changes

Bug fix: #33291

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • My code follows the accessibility standards.
  • I've tested my changes with keyboard and screen readers.
  • My code has proper inline documentation.
  • I've included developer documentation if appropriate.
  • I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

@stokesman stokesman added the [Package] Components /packages/components label Aug 17, 2021
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Size Change: +202 B (0%)

Total Size: 1.15 MB

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@stokesman stokesman marked this pull request as draft August 17, 2021 21:44
@ntsekouras
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👋 - thanks for working on this! I haven't seen in depth all the changes in your PR so but I'd expect to see something like changing an onChange function to use some logic like onPressEnter which leads to something like roundClamp( currentValue, min, max, step ); Have you explored something like that? It seems to involve way less changes (I think 😄 ), unless it doesn't solve the actual problem.

@stokesman
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Hi Nik, thanks for the suggestion! I think your idea would probably work and, yes, likely with much less changes. I'm glad to give it go (and wish I'd tried that first 😢 😄 ) but I'll have to work on some other stuff before I can get back to this.

@stokesman
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stokesman commented Aug 25, 2021

@ntsekouras, I got around to trying your suggestion. I might have known what the catch would be but had forgotten. Modification of the value on change events may interfere with input. A prime example is typing a multiple digit number whose first digit is a number less than min as it will be resolved to min as soon as the first digit is entered.

While that's probably not a very common scenario, it is not easy to deal with specifically. Even if it were, it would also involve skipping some calls to onChange which means it starts to look a lot like what is done in this PR.

I'm all ears in case I've overlooked something.

@stokesman stokesman force-pushed the fix/number-control-validation branch from 69444ee to 9b56eea Compare March 5, 2022 17:20
@stokesman
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Closing in favor of #39260 that does much the same thing in a different way.

@stokesman stokesman closed this Mar 7, 2022
@stokesman stokesman deleted the fix/number-control-validation branch March 7, 2022 16:56
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components: Add baseline validation to NumberControl
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