How To Make A Simple Javascript Login Page

How To Articles

Welcome to my article on how to create a simple JavaScript login page! As an avid web developer, I understand the importance of having a secure login system for your website. In this tutorial, I will guide you through the process of creating a basic login page using JavaScript. Whether you are a beginner or have some experience with web development, this tutorial is designed to be easy to follow and implement.

Setting up the HTML structure

Before we dive into the JavaScript code, let’s first set up the basic HTML structure for our login page. In this example, we will have a simple form with two input fields for the username and password, along with a login button.


<form id="loginForm">
<label for="username">Username:</label>
<input type="text" id="username" name="username" required>
<br>

<label for="password">Password:</label>
<input type="password" id="password" name="password" required>
<br>

<button type="submit" id="loginBtn">Login</button>
</form>

In the above code, we have an HTML form with two input fields: username and password. The “required” attribute makes these fields mandatory, so the user cannot submit the form without filling them in. We also have a login button with the id “loginBtn”.

Writing the JavaScript code

Now that we have our HTML structure ready, let’s move on to writing the JavaScript code that will handle the login functionality. We will attach an event listener to the login button and perform some basic validation before allowing the user to log in.


<script>
// Get the form element
const loginForm = document.getElementById('loginForm');

// Attach an event listener to the form submission
loginForm.addEventListener('submit', function(event) {
event.preventDefault(); // Prevent form submission

// Get the username and password values
const username = document.getElementById('username').value;
const password = document.getElementById('password').value;

// Perform validation
if (username === 'admin' && password === 'password') {
// Redirect the user to the homepage
window.location.href = 'https://www.example.com/home';
} else {
alert('Invalid username or password. Please try again.');
}
});
</script>

In the JavaScript code above, we first get a reference to the login form element using its id. We then attach an event listener to the form’s submit event. Inside the event listener function, we prevent the default form submission behavior using event.preventDefault(). This allows us to handle the form submission ourselves.

We then retrieve the values of the username and password input fields. In this example, we are using the values ‘admin’ and ‘password’ as the correct credentials. You can modify the code to check against your own authentication system or database.

If the username and password match the expected values, we redirect the user to the homepage using window.location.href. Otherwise, we display an alert message indicating that the login credentials are invalid.

Conclusion

Creating a simple JavaScript login page doesn’t have to be a daunting task. By following the steps outlined in this tutorial, you should now have a good understanding of how to implement a basic login system using JavaScript. Remember, this is just a starting point, and you can build upon it to add more features and enhance the security of your login page.

Happy coding!