[damyanpetev]

Description

Setting commandfor on a detached igc-button or igc-icon-button threw getElementById is not a function: a detached element is its own root node, and elements have no getElementById. Frameworks that set attributes before inserting an element hit this whenever the button is already defined, for example Blazor rendering <IgbButton Commandfor="..."> on a page visited a second time.

The setter now looks up the target only while connected, and connectedCallback resolves it on attach. This also applies a commandfor changed while detached, which used to keep the previous target once the button was attached again.

Type of Change

• Bug fix (non-breaking change that fixes an issue)

Testing

Button spec: commandfor set before the button is inserted, and changed while it is detached. Both fail on master with the error above.

Checklist

• My code follows the project's coding standards
• I have tested my changes locally
• I have added a CHANGELOG.md entry under [Unreleased]
• I have read the contributing guidelines, including the accessibility, dependency and security rules

🤖 Generated with Claude Code

[Copilot]

🟡 Changes recommended

The change still has an active documentation issue because the component spec does not describe the newly supported reconnect and detached-attribute lifecycle behavior.

1 open issue

• Document detached and pre-connection command target resolution · New

What changed in this PR

Fixes commandfor resolution for buttons configured while detached by deferring target lookup until connection and re-resolving targets after detached changes or reconnection.

Changes:

• Defers detached commandfor lookups until connectedCallback.
• Re-resolves command targets when commandfor changes while detached.
• Adds regression tests and an Unreleased changelog entry.

File	Description
src/​components/​button/​button.spec.ts	Adds regression tests for commandfor configured before insertion and changed while the button is detached.
src/​components/​button/​button-base.ts	Guards detached target lookups and resolves the commandfor target when the component connects.
CHANGELOG.md	Documents the detached-button commandfor fix under Unreleased.

_{Review effort: Lite}