Error checking in register component, redirect to login if success

frontend/src/Components/Register.tsx

@@ -3,14 +3,26 @@ import { NewUser } from "../Types/Users";
 import { api } from "../API/API";
 import Logo from "../assets/Logo.svg";
 import Button from "./Button";
+import { useNavigate } from "react-router-dom";
 
 export default function Register(): JSX.Element {
-  const [username, setUsername] = useState("");
-  const [password, setPassword] = useState("");
+  const [username, setUsername] = useState<string>();
+  const [password, setPassword] = useState<string>();
+  const [errMessage, setErrMessage] = useState<string>();
+
+  const nav = useNavigate();
 
   const handleRegister = async (): Promise<void> => {
-    const newUser: NewUser = { userName: username, password };
-    await api.registerUser(newUser); // TODO: Handle errors
+    const newUser: NewUser = {
+      userName: username ?? "",
+      password: password ?? "",
+    };
+    const response = await api.registerUser(newUser);
+    if (response.success) {
+      nav("/"); // Instantly navigate to the login page
+    } else {
+      setErrMessage(response.message ?? "Unknown error");
+    }
   };
 
   return (
@@ -67,6 +79,7 @@ export default function Register(): JSX.Element {
               }}
             />
           </div>
+          {errMessage && <p className="text-red-500 text-xs">{errMessage}</p>}
           <div className="flex items-center justify-between">
             <Button
               text="Register"