angular / angular/components

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

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area: material/autocomplete P3
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TypeScript
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描述

### 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)

贡献指南

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调研方向

从链接的 StackBlitz 复现和 issue 中描述的 mat-autocomplete 交互开始,并测试列出的移动浏览器和设备。当在打开的下拉框内滚动或拖动时始终移动其中的选项,而不是底层页面,包括选择、清除、关闭和重新打开之后,修复才算完成。

由索引模型根据 Issue 内容生成。

评估

技术栈
angular, typescript
领域
frontend
Issue 类型
缺陷
难度
4/5
预计耗时
3-5 天
活跃度
停滞
描述清晰度
需要澄清
新手友好度
35/100

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