global-events

Global Events

A child component owns a document-level keydown listener and increments a counter that lives in the parent — so the count survives the child's unmount/remount and proves the listener is cleaned up.

What it shows

• ui.UseGlobalKey(fn) — a managed document keydown listener whose underlying js.Func lifetime is scoped to the effect (registered on mount, released on unmount).
• Lifting the counter into the parent so toggling the child off and on cannot reset it.
• Leak-safety: if the listener weren't released on unmount, a single keypress after remount would double-count. It doesn't.

Run

gwc dev examples/public/global-events

Press a key to increment; toggle the listener child off and on and confirm a keypress still counts exactly once.