angular / angular/components

bug(autocomplete): DisplayWith retriggering + Programmatical value selection

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#28,161 1 commentaire 1 réaction 0 personnes assignées Voir sur GitHub
area: material/autocomplete P3
Langage dominant
TypeScript
Étoiles
25k
Forks
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Merge moyen
1 j 8 h
PR mergées (30 j)
91

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

1. It's impossible to retrigger displayWith method (only when resetting form value).
2. Initial data is not displayed on dropdown with checkmark symbol, when property is binded. After selection all is working
2.1 When changing value programatically, checkmark is displayed on wrong selection.

### Reproduction

StackBlitz link: https://stackblitz.com/edit/zkwk2u
Steps to reproduce:
1. Change language
2. Value is not translated + not possible trigger displayWith. I tried different things, even updateValueAndValidity on formControl, which should really execute ValueChanges. Only when changing property value with setValue, it triggers displayWith method. With this approach I saw second problem, with programmatically changing control value.

1. Open link, selected value is displayed correctly with displayWith
2. Open dropdown no selection is displayed.
3. Select new value (first value) from dropdown (value is displayed correctly with check mark)
4. Click button (it changes value to 3, 3rd selection)
5. Value change is triggered and input shows correct data.
6. Open dropdown, it still shows wrong selection

### Expected Behavior

1. It's possible to trigger programmatically displayWith
2. Programmatically selected value + initial value is displayed correctly

### Actual Behavior

1. When already displayed value with displayWith, then this is not possible to change
2. Selection is not shown or shown wrongly

### Environment

- Angular: 17.0.0
- CDK/Material: 17.0.1
- Browser(s):
- Operating System (e.g. Windows, macOS, Ubuntu):

Guide de contribution

Ouvrir le guide de contribution

Piste de recherche

Commencez par la reproduction liée dans StackBlitz et examinez le comportement de Angular Material autocomplete autour de displayWith, des valeurs initiales et des modifications programmatiques de setValue. Le travail est terminé lorsque displayWith peut être relancé programmatiquement et que la coche de la liste déroulante suit correctement les valeurs sélectionnées initialement et programmatiquement.

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

Évaluation

Stack technique
angular, typescript
Domaine
frontend
Type d'issue
Bug
Difficulté
3/5
Temps estimé
1-2 jours
Activité
À l'abandon
Clarté
Plutôt claire
Accessibilité débutants
35/100

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