angular/components

Changing the value of one progress bar repaints other progress bars on the same page

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#19.873 aperta il 6 lug 2020

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Descrizione

Reproduction

Use StackBlitz to reproduce your issue: https://stackblitz.com/edit/angular-dc63ug?file=src%2Fapp%2Fprogress-bar-determinate-example.html

Steps to reproduce:

  1. Open the url in latest chrome
  2. Open dev tool and click three dots, click more tools, add Rendering tab, select paint flashing checkbox there
  3. Now go back to demo url and change the value of second progress bar by typing in the second input box (from top)
  4. while changing any value you will observe the beneath progress bar is also repainting

Expected Behavior

What behavior were you expecting to see? Changing the value of one progress bar should not re-paint the other progress bar on the same page

Actual Behavior

What behavior did you actually see? Changing the value of one progress re-painting the other progress bar on the same page

Environment

  • Angular:8.2
  • CDK/Material:8.2.3
  • Browser(s): Chrome - 83.0.4103.116
  • Operating System (e.g. Windows, macOS, Ubuntu): Windows

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Direzione di ricerca
The issue is reproducible in the provided StackBlitz. Investigate the progress bar component in `src/lib/progress bar/` directory. The repaint occurs because Angular's default change detection triggers updates on all progress bars when one changes. Consider using `OnPush` change detection or detaching change detection for individual progress bars.
Tech stack
typescripthtmlcss
Dominio
frontend
Tipo issue
Bug
DifficoltàQuanto dovrebbe essere impegnativa per un nuovo contributor.
3
Tempo stimatoTempo stimato per completare e verificare uno scope piccolo.
1-3 ore
Stato attivitàQuanto è probabile che la issue sia ancora attiva e reviewable.
Nuova
ChiarezzaQuanto chiaramente la issue descrive problema, scope e risultato atteso.
Chiara
Prerequisiti
Angular change detectionZone.js
Adatta ai principiantiQuanto la issue è adatta a contributor alla prima esperienza.
70