Remembering a user’s login information is a common requirement in web applications. One way to implement this functionality is by using session storage in JavaScript. In this blog post, we will explore how to use session storage to create a “remember me” feature.

What is Session Storage?

Session storage is a web storage API that allows developers to store key-value pairs in the browser for a specific session. Unlike local storage, session storage data is only available for the duration of the session and gets cleared when the browser is closed.

Implementing the Remember Me Functionality

To implement the “remember me” functionality, we can store the user’s login information in session storage and retrieve it later when needed. Here’s an example code snippet demonstrating the implementation:

// Store the user's login information
function rememberMe(username, password) {
  if (sessionStorage) {
    sessionStorage.setItem('username', username);
    sessionStorage.setItem('password', password);
  }
}

// Retrieve the stored login information
function getRememberedUser() {
  let username = sessionStorage.getItem('username');
  let password = sessionStorage.getItem('password');
  
  return { username, password };
}

In the code above:

• The rememberMe function takes the username and password as parameters and stores them in the session storage using the setItem method.
• The getRememberedUser function retrieves the stored username and password using the getItem method and returns them as an object.

Using the Remember Me Functionality

Once the remember me functionality is implemented, we can use it to enhance the user login experience. Here’s an example of how we can use the stored login information:

// Check if the user is remembered and pre-fill the login form
function preFillLoginForm() {
  let rememberedUser = getRememberedUser();
  
  if (rememberedUser.username && rememberedUser.password) {
    document.getElementById('usernameInput').value = rememberedUser.username;
    document.getElementById('passwordInput').value = rememberedUser.password;
  }
}

// Handle the login form submission
function handleLogin() {
  let username = document.getElementById('usernameInput').value;
  let password = document.getElementById('passwordInput').value;
  
  // Authenticate the user
  // ...
  
  // If remember me checkbox is checked, store the login information
  if (document.getElementById('rememberMeCheckbox').checked) {
    rememberMe(username, password);
  }
}

In the code above:

• The preFillLoginForm function checks if the user is remembered (has login information stored), and if so, it pre-fills the login form with the stored information.
• The handleLogin function is called when the login form is submitted. It retrieves the entered username and password, authenticates the user, and if the “remember me” checkbox is checked, it stores the login information using the rememberMe function.

Conclusion

Using session storage in JavaScript provides a convenient way to implement a “remember me” functionality in web applications. By storing user login information in session storage, we can enhance the user experience by pre-filling the login form and providing a seamless login process.

Implementing a “remember me” feature not only saves the user from having to enter their login information every time but also helps to maintain user engagement by streamlining the login experience.

#Tech #JavaScript