angular / angular/components

bug(MatFormField): Outline form field with prefix labels misalign when the document direction is changed.

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area: material/form-field gemini-triaged P3
Langage dominant
TypeScript
Étoiles
25k
Forks
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Merge moyen
1 j 8 h
PR mergées (30 j)
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Description

### Is this a regression?

- [ ] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

_No response_

### Description

When the direction property on the document is changed (LTR to RTL and viceversa), outline form fields with a prefix suffer from label misalignment. This presents a problem for apps that have forms and need to support a location switcher that has a RTL language like Arabic.

### Reproduction

StackBlitz link: https://stackblitz.com/edit/3rswucyt?file=src%2Fexample%2Fform-field-appearance-example.html
Steps to reproduce:
1. Observe button in default LTR mode.

Image

3. Click the "Toggle dir" button to change the direction in the wrapper to RTL
4. Observe the label is now misaligned, trailing off to the right.

Image

5. Click the "Rerender" button to remove the form from the dom for one second
6. Observe that when the component re-renders, the label alignment is correct.

Image

7. Click the "Toggle dir" button again to set the direction back to LTR
8. Observe the label is misaligned again, only fixes when re-rendering the button.

Image

### Expected Behavior

When changing the direction, the label alignment should react and adjust.

### Actual Behavior

The label is not aligning, it seems that it has the calculation obtained from before the direction changed. Since re-rendering the component fixes the problem, it appears that the logic is inside the component, but there is no way to notify the component a re-calculation is needed.

### Environment

- Angular: 22.1.0
- CDK/Material: 22.1.0
- Browser(s): Google Chrome, Microsoft Edge, Safari
- Operating System (e.g. Windows, macOS, Ubuntu): MacOS

Guide de contribution

Ouvrir le guide de contribution

Piste de recherche

Commencez par la reproduction StackBlitz liée et inspectez l’implémentation Angular Material MatFormField impliquée dans les libellés de contour et les préfixes. Modifiez la direction du document sans effectuer de nouveau rendu, puis comparez le comportement après un nouveau rendu ; le travail est terminé lorsque le libellé reste correctement aligné lors du passage de LTR à RTL et inversement.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Évaluation

Stack technique
angular, typescript
Domaine
frontend, internationalization
Type d'issue
Bug
Difficulté
3/5
Temps estimé
1-2 jours
Activité
Calme
Clarté
Plutôt claire
Accessibilité débutants
56/100

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