refactoring

Resolve #7779

packages/client/src/scripts/focus.ts

@@ -0,0 +1,27 @@
+export function focusPrev(el: Element | null, self = false, scroll = true) {
+	if (el == null) return;
+	if (!self) el = el.previousElementSibling;
+	if (el) {
+		if (el.hasAttribute('tabindex')) {
+			(el as HTMLElement).focus({
+				preventScroll: !scroll
+			});
+		} else {
+			focusPrev(el.previousElementSibling, true);
+		}
+	}
+}
+
+export function focusNext(el: Element | null, self = false, scroll = true) {
+	if (el == null) return;
+	if (!self) el = el.nextElementSibling;
+	if (el) {
+		if (el.hasAttribute('tabindex')) {
+			(el as HTMLElement).focus({
+				preventScroll: !scroll
+			});
+		} else {
+			focusPrev(el.nextElementSibling, true);
+		}
+	}
+}