dotnet/aspnetcore

[Blazor] InputText binding is not supported well with Shadow DOM elements

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#60.885 geöffnet am 11. März 2025

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area-blazorbughelp wanted

Beschreibung

Is there an existing issue for this?

  • I have searched the existing issues

Describe the bug

I use a web component library which create input elements within shadow DOM (shadowRoot property). Let's call it <super-input> I overrided InputText content with .

When using @bind on the value with oninput event, it doesn't work as well as the InputText or html input element. Characters could be sent weirdly depending the connection, and the use or websocket or no, and specially when the typing is fast.

I already digged into the problem and found a fix on my branch : https://github.com/Poppyto/aspnetcore/tree/poppyto/use-shadow-input-with-binding

The idea is to relay on event.composedPath().find(_=>true) instead of event.target when dealing with some events.

I would be happy to discuss about this bug

Expected Behavior

The typing must be smooth

Steps To Reproduce

No response

Exceptions (if any)

No response

.NET Version

8

Anything else?

No response

Contributor Guide

Tech Stack
csharp
Domain
frontend
Issue Type
bug
SchwierigkeitGeschätzte Implementierungsschwierigkeit für neue Contributors, von 1 für sehr kleine Änderungen bis 5 für Expertenarbeit.
3
Geschätzte ZeitEin grober Zeitrahmen, um zu recherchieren, zu implementieren, zu testen und einen Pull Request vorzubereiten.
half day
AktivitätsstatusWie verfügbar das Issue gerade wirkt: frisch, aktiv, stale, blockiert oder wartet auf Maintainer-Input.
active
KlarheitWie klar das Issue die erwartete Änderung, Akzeptanzkriterien und den nächsten Schritt erklärt.
clear
Voraussetzungen
Basic Blazor knowledgeShadow DOM conceptsEvent propagation understanding
EinsteigerfreundlichkeitEin Score von 1 bis 100, der schätzt, wie zugänglich dieses Issue für First-Time Contributors ist.
50
Research-Richtung
The issue proposes a fix using event.composedPath() instead of event.target for Shadow DOM elements. A reference branch exists at https://github.com/Poppyto/aspnetcore/tree/poppyto/use shadow input with binding. Investigate the Blazor input binding mechanism in aspnetcore, likely in files related to event handling (e.g., WebEvent.cs or InputText.cs). Review the proposed changes, test with the provided scenario, and ensure no regressions in standard input binding.