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Firebase and web integration

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Firebase was launched by Google in 2014 to provide backend services to its users. It provides different types of high-quality services that we can use to develop mobile and web applications. For example, it provides real-time database, user authentication, cloud storage, and more. Additionally, it provides analytics capabilities to analyze the application’s traffic. More popular due to its quick setup.

In this tutorial, we will learn how to integrate Firebase Authentication into a single-page web application.

Users should follow the steps below to set up and integrate a Firebase account with a single-page web application.

Step 1 - First, visit the Firebase website and create an account.
Step 2 - Now, go to https://console.firebase.google.com/u/0/ to open the Firebase console.
Step 3 - Now, click on the "Create Project" button to start creating a new project.

Firebase 与 Web 集成

Step 4 - Fill in the required details here and click on the Continue button. We are creating a "test" application here.

Firebase 与 Web 集成

Step 5 - Select your preferred location, accept the terms and conditions, and click the "Create Project" button. After that, wait for it to create a project for you.

Firebase 与 Web 集成

Step 6 - It will redirect you to the following page. Here, click on the "Authentication" card element. After that, click on the "Start" button.

Firebase 与 Web 集成

Step 7 - Go to the "Login Method" tab and click on the "Email/Password" field. After that, enable the Email/Password method and click on the Save button. From here users can also enable other ways to authenticate your web application.

Firebase 与 Web 集成

Step 8 - Now, click on "Project Settings" and get the API and project ID from there. Store it somewhere. We will use this in the examples below.

Firebase 与 Web 集成

Create a single-page static application

Now, the setup of the Firebase project is complete. Next, we'll create a single-page static application.

step

Step 1 - Add Firebase to your project either way. Here, we added the use of a CDN. Developers can also use the SDK according to the projects they are currently working on.
Step 2 - Now, build a simple HTML template to enter email and password. Also, add register, login, and logout buttons.
Step 3 - In JavaScript, initialize the Firebase configuration using the API key and project ID.
Step 4 - Use the onAuthStateChanged() method to print a message when the authentication state changes.
Step 5 - Initialize authentication using Firebase's auth() method.
Step 6 - Now, create an addUsers() function to add users to Firebase. Access the email and password in the function and use the createUserWithEmailAndPassword() method to add the user to Firebase.
Step 7 - Now, create a logIn() function and use signInWithEmailAndPassword() method to log in to the application using email and password.
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Step 8 - Additionally, create a logout() function that uses the signOut() method to end the current session.

Example

In the example below, we create a simple form with two input fields. Whenever a user clicks the register button, it calls the addUsers() function, which adds the user to Firebase. Firebase will return an error if the user enters a weak password or incorrect email address.

Additionally, when the user clicks the login button, it calls the "login()" function, which allows the user to log in to the application. If the user enters an incorrect password or email, Firebase returns an error. When the user clicks the signOut button, it executes the signOut() function and ends the current session.

Note - Here, developers need to change the API key, project ID, and project domain as per their project. The following credentials are generated for testing purposes only.

<html>
<head>
   <script src = "https://www.gstatic.com/firebasejs/8.2.7/firebase-app.js">
   </script>
   <script src = "https://www.gstatic.com/firebasejs/8.2.7/firebase-auth.js">
   </script>
   <style>
      button {
         width: 100px;
         height: auto;
         padding: 5px 10px;
         background-color: aqua;
         border: 2px solid green;
         border-radius: 12px;
      }
   </style>
</head>
<body>
   <h2>
      Using the <i> Firebase auth </i> to add authentication in a single page static website.
   </h2>
   <div class = "container">
      <h2>Enter the email and password below.</h2>
      <input type = "email" placeholder = "abcd@gamil.com" id = "email" />
      <br /> <br />
      <input type = "password" placeholder = "Add password" id = "password" />
      <br /> <br />
      <button onclick = "addUsers()" id = "signUp">
         SignUp
      </button>
      <button onclick = "login()" id = "logIp">
         SignIn
      </button>
      <button onclick = "logout()" id = "logOut">
         SignOut
      </button>
      <br> <br>
      <div id = "output"> </div>
   </div>
   <script>
      let output = document.getElementById('output');
      // Your web app's Firebase configuration
      var initialConfig = {
         apiKey: "AIzaSyBsYILuhF4wOGOe0rFhPudhVWO3cGh2z18", // change API keu
         authDomain: "localhost", // change domain
         projectId: "test-application-45005", // change project Id
      };
      
      // Initialize Firebase
      firebase.initializeApp(initialConfig);
      const authenticate = firebase.auth();
      
      // Check if there are any active users
      firebase.auth().onAuthStateChanged((user) => {
         if (user) {
            var email = user.email;
            output.innerHTML = "Active user is " + email + "<br>";
         } else {
            output.innerHTML = "No active users" + "<br>";
         }
      });
      
      // add users
      function addUsers() {
         var email = document.getElementById("email").value;
         var password = document.getElementById("password").value;
         
         // adding users via the promise
         authenticate.createUserWithEmailAndPassword(
            email,
            password
         ).then((userCredential) => {
            output.innerHTML = "User added successfully and user id is " + userCredential.user.uid + "<br>";
         }).catch((e) => {
            output.innerHTML = "Some error occurred - " + e.message + "<br>";
         });
      }
      
      // login function
      function login() {
         var email = document.getElementById("email").value;
         var password = document.getElementById("password").value;
         authenticate.signInWithEmailAndPassword(
         email, password).then((userCredential) => {
            output.innerHTML = "User login successfully and user id is " + userCredential.user.uid + "<br>";
         }).catch((e) => {
            output.innerHTML = "Some error occurred - " + e.message + "<br>";
         });
      }
      
      // logout currently logged-in user
      function logout() {
         authenticate.signOut();
         output.innerHTML = "User logout successfully";
      }

   </script>
</body>
</html>

Users learned how to integrate Firebase with web applications. For experienced developers, integrating Firebase with any web application takes barely 15 minutes. Additionally, it will give an error if the user enters a weak password when logging into the app, and it manages everything else that the developer doesn't need to worry about.

Additionally, developers can use Firebase Database with any web or mobile application.

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Create a single-page static application

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