Initial commit. State 04.2021.

wp-content/themes/professional/assets/js/navigation.js

@@ -0,0 +1,34 @@
+/**
+ * navigation.js
+ *
+ * Handles toggling the navigation menu for small screens.
+ */
+( function() {
+	var container, button, menu;
+
+	container = document.getElementById( 'site-navigation' );
+	if ( ! container )
+		return;
+
+	button = container.getElementsByTagName( 'h1' )[0];
+	if ( 'undefined' === typeof button )
+		return;
+
+	menu = container.getElementsByTagName( 'ul' )[0];
+
+	// Hide menu toggle button if menu is empty and return early.
+	if ( 'undefined' === typeof menu ) {
+		button.style.display = 'none';
+		return;
+	}
+
+	if ( -1 === menu.className.indexOf( 'nav-menu' ) )
+		menu.className += ' nav-menu';
+
+	button.onclick = function() {
+		if ( -1 !== container.className.indexOf( 'toggled' ) )
+			container.className = container.className.replace( ' toggled', '' );
+		else
+			container.className += ' toggled';
+	};
+} )();