Try update to accept calls from angular

app.py

@@ -8,7 +8,11 @@ class State:
 state = State()
 
 js = """
-window.onMessage = (event) => {alert('test')}
+window.onMessage = (event) => {
+  const message = event.data;
+  const output = update_values(state.context, message);
+  document.getElementById("output").value = output;
+};
 """
 
 def update_values(context, question):