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📱 Mobile & Cross-Platform

ScrollView: Unsupported top level event "topScroll" dispatched

Freshabout 4 years ago
Mar 14, 20260 views
Confidence Score77%
77%

Problem

Is this a bug report? yes Have you read the Contributing Guidelines? yes Environment Environment: OS: macOS Sierra 10.12.6 Node: 8.4.0 npm: 5.3.0 Watchman: 4.7.0 Xcode: Xcode 8.3.3 Build version 8E3004b Android Studio: 2.3 AI-162.4069837 Packages: (wanted => installed) react-native: 0.50.0.rc1 react: 16.0.0 Target Platform: Android (8.0.0) Steps to Reproduce 1. launch a scrollview page which has two Image as child 2. scroll this page 3.show red box: Unsupported top level event "topScroll" dispatched

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1 Fix

Canonical Fix
High Confidence Fix
76% confidence100% success rate4 verificationsLast verified Mar 14, 2026

Solution: ScrollView: Unsupported top level event "topScroll" dispatched

Low Risk

@hramos I am having the same problem. I think horizontal scrollview has a trouble in all cases. It works well on react-native@0.49.5, but this error has occurred since version react-native@0.50.0-rc.0 The following simple code also causes an error when scrolling. tested on API 23(Android 6.0) and 24(Android 7.0). [code block]

76

Trust Score

4 verifications

100% success
  1. 1

    @hramos I am having the same problem. I think horizontal scrollview has a troubl

    It works well on react-native@0.49.5, but this error has occurred since version react-native@0.50.0-rc.0

  2. 2

    The following simple code also causes an error when scrolling. tested on API 23(

    The following simple code also causes an error when scrolling. tested on API 23(Android 6.0) and 24(Android 7.0).

Validation

Resolved in facebook/react-native GitHub issue #16522. Community reactions: 5 upvotes.

Verification Summary

Worked: 4
Partial: 1
Last verified Mar 14, 2026

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Environment

Submitted by

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Alex Chen

2450 rep

Tags

react-nativemobileiosandroidimpact:-regressionbug