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bug(mat-select): Talkback cannot navigate long dropdowns

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#32,628 3 則留言 0 個 reaction 已指派 0 人 在 GitHub 檢視

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評估

難度
4/5
預估耗時
3-5 天
新手友好度
38/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
停滯
技術堆疊
angular, typescript

研究方向

從 mat-select 和 mat-option 入口開始,使用一個很長的選項清單,在啟用 TalkBack 的 Android Chrome 中重現此問題。完成標準是,向左/向右導覽始終將焦點保持在預期元素上,避免 UI 大幅跳動或抖動,並持續明確顯示取得焦點的選項。

由索引模型根據 Issue 內容生成。

描述

Accessibility area: material/select P3
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

When navigating through a mat-select element using Talkback on an Android mobile device, dropdowns with many options cause the page to not maintain focus and result in major jittering and page UI issues. This is not the case with a list of small options. This may be partially a mat-option issue as well.

Reproduction

StackBlitz link:
Steps to reproduce:

  1. view page with Talkback on Android
  2. attempt to move through the list (note the jittering and incorrectly moving content)
Expected Behavior

Swiping left and right should provide consistent navigation without large UI jumps and page jittering. The element that is being focused should be indicated to the user.

Actual Behavior

Swipping left and right with standard mobile screen reader navigation on long dropdowns results in UI reloading errors and focus issues. Occasionally, the first or last few elements will function normally but issues occur at the midpoints of these lists.

Looking at other UIs that have a similar element the Multiple Search Selection "state" field here seems very good, UI focus is maintained and there are no large reloading jumps when navigating. Though this is an arbatray dropdown example, and I am sure there are other ones that could be identified.

Environment
  • Angular: 21.0.6
  • CDK/Material: 20.2.9
  • Browser(s): Chrome
  • Operating System (e.g. Windows, macOS, Ubuntu): Android
主要語言
TypeScript
星號
25k
分支
6.8k
平均合併
1 天 7 小時
30 天內合併 PR
69

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  • 閱讀貢獻指南

從這裡開始

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  3. Fork 儲存庫,在一個分支上完成修改。
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