angular / angular/components

bug(material/chips): MatChipSelectionChange not emitting on certain deselections

Aperta
#27,909 1 commento 0 reazioni 0 assegnatari Vedi su GitHub
area: material/chips P3
Lingua principale
TypeScript
Stelle
25k
Fork
6.8k
Merge medio
1g 8h
PR unite (30g)
91

Descrizione

### 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

`selectionChange` output for `MatChipOption` is [stated to be](https://material.angular.io/components/chips/api#MatChipOption):
> Emitted when the chip is selected or **deselected**.

But this is not true for deselection. It appears the event is only emitted for deselection when **the chip in question** is manually selected/toggled by the user. When the `MatChipListbox` is **in single-select mode and a chip is currently selected**, selecting a different chip means the prior chip is deselected --> deselecting should mean emitting the `selectionChange` event, but it is not happening in this scenario.

See the below StackBlitz link.

### Reproduction

StackBlitz link: https://stackblitz.com/edit/firqg1
Steps to reproduce:

(First chip is initially selected)
1. Click on the Second chip.
2. First chip becomes deselected, but no `selectionChange` output event was emitted (in this case, the `MatChipSelectionChange` object should be logged to the console).

### Expected Behavior

`selectionChange` output for the First chip should have emitted.

### Actual Behavior

`selectionChange` output for the First chip does not emit.

### Environment

- Angular: 16
- CDK/Material: 16.2.7 (latest)
- Browser(s): Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): Windows

Guida per i contributori

Apri la guida per i contributori

Direzione di ricerca

Apri la riproduzione StackBlitz collegata e analizza il comportamento di selezione di MatChipOption e MatChipListbox descritto nell’issue. Verifica il percorso di deselezione in single-select quando selezioni il secondo chip; il lavoro è completato quando il primo chip emette il suo evento MatChipSelectionChange quando viene deselezionato.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Valutazione

Stack tecnologico
angular, typescript
Ambito
frontend
Tipo di issue
Bug
Difficoltà
3/5
Tempo stimato
1-2 giorni
Stato di attività
Ferma
Chiarezza
Abbastanza chiara
Idoneità per principianti
45/100

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