angular / angular/components

bug(mat-selection-list): mat-list-option deselecting itself when recreated in virtual-scroll-viewport

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#29,426 2 commentaires 0 réactions 0 personnes assignées Voir sur GitHub
area: material/list P4
Langage dominant
TypeScript
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Forks
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Merge moyen
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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

I have a wrapper component for the `mat-selection-list` to support generic filtering. Also I have a master checkbox to select everything in the current filter scope. To support large datasets I also have an option for `virtual scrolling`.

Since I allow filtering, the source set of the list is constantly changing which clears the selection if an option is filtered out. To prevent this, I use the angular `SelectionModel` and the callbacks of the mat-list-options. But here is the problem:

Since the options are destroyed and recreated while scrolling through the viewport, the `selectedChange` event of the option is triggered with the initial unselected state of an option, so an option deselects itself when being recreated. But since this does not happen all the time, it seems there is a race between `(selectedChange)` and `[selected]`.

### Reproduction

StackBlitz link: https://stackblitz.com/edit/stackblitz-starters-iidbcx
Steps to reproduce:
1. Trigger the master check-box
2. scroll
3. see the master changes to indeterminate since check-boxes deselect themself

### Expected Behavior

I would expect that the inital `selected = false` when creating the component is not emitted as an event

### Actual Behavior

Inital `selected = false` when creating the component is emitted as an event and selected itself. But not always --> race

### Environment

Angular CLI: 18.0.7
Node: 18.20.3
Package Manager: npm 10.2.3
OS: linux x64

Angular: 18.0.6
... animations, cdk, cdk-experimental, common, compiler
... compiler-cli, core, forms, material, platform-browser
... platform-browser-dynamic, router

Package Version
---------------------------------------------------------
@angular-devkit/architect 0.1800.7
@angular-devkit/build-angular 18.0.7
@angular-devkit/core 18.0.7
@angular-devkit/schematics 18.0.7
@angular/cli 18.0.7
@schematics/angular 18.0.7
rxjs 7.8.1
typescript 5.4.5
zone.js 0.14.7

Guide de contribution

Ouvrir le guide de contribution

Piste de recherche

Commencez par la reproduction StackBlitz et examinez l’interaction entre mat-selection-list, mat-list-option et virtual-scroll-viewport lors du défilement après avoir sélectionné tous les éléments. Vérifiez que la recréation d’une option n’émet pas d’événement selectedChange initial avec false et que la sélection principale reste stable après le filtrage et le défilement.

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
4/5
Temps estimé
3-5 jours
Activité
À l'abandon
Clarté
Plutôt claire
Accessibilité débutants
35/100

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