refactoring to support control

javascript/control.js

@@ -0,0 +1,7 @@
+const getControlActiveTab = (...args) => {
+  const selectedTab = gradioApp().querySelector('#control-tabs > .tab-nav > .selected');
+  let activeTab = '';
+  if (selectedTab) activeTab = selectedTab.innerText.toLowerCase();
+  args.shift();
+  return [activeTab, ...args];
+};