From b8dcb2d3f44458697eab1caac502fa8b46065e30 Mon Sep 17 00:00:00 2001
From: Marcel <marcel@familienarchiv>
Date: Sat, 25 Apr 2026 21:17:06 +0200
Subject: [PATCH] feat(persons): add radioGroupNav action for keyboard
 navigation in type selector

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .../lib/actions/radioGroupNav.svelte.spec.ts  | 87 +++++++++++++++++++
 frontend/src/lib/actions/radioGroupNav.ts     | 28 ++++++
 2 files changed, 115 insertions(+)
 create mode 100644 frontend/src/lib/actions/radioGroupNav.svelte.spec.ts
 create mode 100644 frontend/src/lib/actions/radioGroupNav.ts

diff --git a/frontend/src/lib/actions/radioGroupNav.svelte.spec.ts b/frontend/src/lib/actions/radioGroupNav.svelte.spec.ts
new file mode 100644
index 00000000..f624b38f
--- /dev/null
+++ b/frontend/src/lib/actions/radioGroupNav.svelte.spec.ts
@@ -0,0 +1,87 @@
+import { describe, it, expect, afterEach } from 'vitest';
+
+const { radioGroupNav } = await import('./radioGroupNav');
+
+describe('radioGroupNav action', () => {
+	const nodes: HTMLElement[] = [];
+
+	function makeGroup(count: number): { container: HTMLElement; buttons: HTMLElement[] } {
+		const container = document.createElement('div');
+		container.setAttribute('role', 'radiogroup');
+		const buttons: HTMLElement[] = [];
+		for (let i = 0; i < count; i++) {
+			const btn = document.createElement('button');
+			btn.setAttribute('role', 'radio');
+			btn.setAttribute('aria-checked', i === 0 ? 'true' : 'false');
+			btn.setAttribute('tabindex', i === 0 ? '0' : '-1');
+			container.appendChild(btn);
+			buttons.push(btn);
+		}
+		document.body.appendChild(container);
+		nodes.push(container);
+		return { container, buttons };
+	}
+
+	afterEach(() => {
+		nodes.forEach((n) => n.remove());
+		nodes.length = 0;
+	});
+
+	it('ArrowRight moves focus to next button', () => {
+		const { container, buttons } = makeGroup(4);
+		radioGroupNav(container);
+		buttons[0].focus();
+		buttons[0].dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowRight', bubbles: true }));
+		expect(document.activeElement).toBe(buttons[1]);
+	});
+
+	it('ArrowRight wraps from last to first', () => {
+		const { container, buttons } = makeGroup(4);
+		radioGroupNav(container);
+		buttons[3].focus();
+		buttons[3].dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowRight', bubbles: true }));
+		expect(document.activeElement).toBe(buttons[0]);
+	});
+
+	it('ArrowLeft moves focus to previous button', () => {
+		const { container, buttons } = makeGroup(4);
+		radioGroupNav(container);
+		buttons[2].focus();
+		buttons[2].dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowLeft', bubbles: true }));
+		expect(document.activeElement).toBe(buttons[1]);
+	});
+
+	it('ArrowLeft wraps from first to last', () => {
+		const { container, buttons } = makeGroup(4);
+		radioGroupNav(container);
+		buttons[0].focus();
+		buttons[0].dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowLeft', bubbles: true }));
+		expect(document.activeElement).toBe(buttons[3]);
+	});
+
+	it('ArrowRight updates aria-checked on new button and removes it from old', () => {
+		const { container, buttons } = makeGroup(4);
+		radioGroupNav(container);
+		buttons[0].focus();
+		buttons[0].dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowRight', bubbles: true }));
+		expect(buttons[1].getAttribute('aria-checked')).toBe('true');
+		expect(buttons[0].getAttribute('aria-checked')).toBe('false');
+	});
+
+	it('destroy removes keydown listener', () => {
+		const { container, buttons } = makeGroup(4);
+		const { destroy } = radioGroupNav(container);
+		destroy();
+		buttons[0].focus();
+		buttons[0].dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowRight', bubbles: true }));
+		expect(document.activeElement).toBe(buttons[0]);
+	});
+
+	it('ignores non-arrow keys', () => {
+		const { container, buttons } = makeGroup(4);
+		radioGroupNav(container);
+		buttons[0].focus();
+		buttons[0].dispatchEvent(new KeyboardEvent('keydown', { key: 'Enter', bubbles: true }));
+		expect(document.activeElement).toBe(buttons[0]);
+	});
+});
diff --git a/frontend/src/lib/actions/radioGroupNav.ts b/frontend/src/lib/actions/radioGroupNav.ts
new file mode 100644
index 00000000..65164327
--- /dev/null
+++ b/frontend/src/lib/actions/radioGroupNav.ts
@@ -0,0 +1,28 @@
+export function radioGroupNav(node: HTMLElement): { destroy: () => void } {
+	function getRadios(): HTMLElement[] {
+		return Array.from(node.querySelectorAll<HTMLElement>('[role="radio"]'));
+	}
+
+	function handleKeydown(event: KeyboardEvent) {
+		if (event.key !== 'ArrowRight' && event.key !== 'ArrowLeft') return;
+
+		const radios = getRadios();
+		const current = radios.indexOf(document.activeElement as HTMLElement);
+		if (current === -1) return;
+
+		const delta = event.key === 'ArrowRight' ? 1 : -1;
+		const next = (current + delta + radios.length) % radios.length;
+
+		radios[current].setAttribute('aria-checked', 'false');
+		radios[next].setAttribute('aria-checked', 'true');
+		radios[next].focus();
+	}
+
+	node.addEventListener('keydown', handleKeydown);
+
+	return {
+		destroy() {
+			node.removeEventListener('keydown', handleKeydown);
+		}
+	};
+}