angular / angular/components

bug(material/autocomplete): Intermittent Scrolling Issue with mat-autocomplete on Mobile Devices

Abierto
#28,581 3 comentarios 4 reacciones 0 asignados Ver en GitHub
area: material/autocomplete P3
Lenguaje dominante
TypeScript
Estrellas
25k
Forks
6.8k
Merge medio
1 d 8 h
PR fusionados (30 d)
91

Descripción

### 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

We are experiencing an intermittent but recurring issue with the mat-autocomplete component when accessed via mobile devices. Specifically, when users attempt to scroll through the options presented in the autocomplete dropdown, the scroll action unexpectedly affects the underlying webpage instead of the dropdown list. This behavior disrupts the user's ability to select an option from the autocomplete list and significantly impacts the usability of the component. The issue has been consistently observed across a variety of devices and web browsers, indicating a broader compatibility or event handling problem within the component.

Video Demonstration of the Issue:
https://javamaniac.github.io/angular-autocomplete-example/screen-20240212-143204.mp4

### Reproduction

StackBlitz link: https://stackblitz.com/~/github.com/javamaniac/angular-autocomplete-example

The issue with mat-autocomplete scrolling is intermittent and does not have a consistent reproduction sequence. However, it generally involves interactions with the autocomplete component on a mobile device. Below are steps that have sometimes led to the issue, though it may require repeating certain actions or experimenting with the sequence to observe the problem.

Potential Reproduction Sequences:

Basic Interaction:
1. Open the autocomplete dropdown.
2. Attempt to scroll through the options.

Extended Interaction:
1. Open the autocomplete dropdown.
2. Select any option from the list.
3. Clear the selected option (erase the choice).
4. Attempt to scroll through the options again.

External Interaction:
1. Open the autocomplete dropdown.
2. Click outside the dropdown to close it.
3. Re-open the dropdown.
4. Attempt to scroll through the options.

Note: The issue may not manifest on the first attempt and could require varying the sequence of actions, such as selecting and clearing choices multiple times or opening and closing the dropdown before scrolling attempts are made. The problem appears to be more likely to occur after interacting with the dropdown in some way (selecting options, erasing choices, or clicking outside the dropdown) before attempting to scroll through the options again.

### Expected Behavior

Dragging (scrolling) within the mat-autocomplete dropdown should scroll through the autocomplete options.

### Actual Behavior

Attempting to scroll through the autocomplete options results in the page itself scrolling.

### Environment

- Angular: 16, 17 (issue likely affects older versions as well)
- CDK/Material: 16, 17
- Browser(s): Chrome, Edge, Safari
- Operating System (e.g. Windows, macOS, Ubuntu): Android, iOS

Devices tested:
- Google Pixel 6 (Chrome, Edge)
- iPhone SE (Chrome, Safari)

Guía de contribución

Abrir la guía de contribución

Línea de trabajo

Comienza con la reproducción vinculada de StackBlitz y la interacción de mat-autocomplete descrita en el issue, probando los navegadores móviles y dispositivos indicados. La corrección estará completa cuando desplazarse o arrastrar dentro del desplegable abierto mueva de forma consistente sus opciones en lugar de la página subyacente, incluso después de seleccionar, borrar, cerrarlo y volver a abrirlo.

Escrito por el modelo de indexación a partir del texto del issue.

Evaluación

Stack tecnológico
angular, typescript
Área
frontend
Tipo de issue
Error
Dificultad
4/5
Tiempo estimado
3-5 días
Estado de actividad
Estancado
Claridad
Necesita aclaración
Aptitud para principiantes
35/100

Recibe los nuevos issues en tu correo

Un resumen breve de issues de GitHub para principiantes.