JavaScript is a programming language that is open-source in nature. It has been specifically crafted for the development of web-oriented applications. Known for its lightweight and interpreted characteristics, JavaScript is also significantly swifter than many other programming languages. Consequently, this enables developers to create web applications that are not only functional but also aesthetically pleasing.
Validating email addresses with JavaScript plays a crucial role in enhancing the user experience (UX) of a web application. This process aids users in accurately filling out forms and guarantees that only legitimate data is transmitted to the server from the client-side of the application.
What is Validation?
Validation is commonly described as the process of verifying user input values. It plays a crucial role in web applications and significantly enhances the user experience (UX). There are numerous elements that we can validate, including Email addresses, Passwords, Dates, Mobile phone numbers, among others.
Utilizing JavaScript for client-side validation accelerates the process of verifying form data, as it performs data processing more swiftly than a server can.
Having gained some insights into validation, let's proceed to implement email validation using JavaScript.
How to validate email utilizing JavaScript?
Verifying email addresses is a crucial aspect of validating an HTML form. An email constitutes a sequence of characters from the ASCII set, separated by an @ symbol into two distinct segments. One segment contains the user's personal information, while the other segment indicates the domain name associated with the registered email.
1. HTML5 Input Validation
The addition of native input validation indicates that it is no longer necessary to solely rely on JavaScript or server-side methods to ensure data accuracy and deliver a seamless user experience; HTML5 now incorporates fundamental form validation features. These attributes enable you to establish guidelines and constraints for user input within form elements.
Syntax:
<input type="email">
Code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Email Validation with HTML5</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: Arial, sans-serif;
background-color: #f5f5f5;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
}
h2 {
margin-bottom: 40px;
}
.form-container {
background-color: #ffffff;
padding: 2rem;
border-radius: 8px;
box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
width: 100%;
max-width: 400px;
}
.form-container h2 {
margin-bottom: 1rem;
color: #333;
text-align: center;
}
.form-group {
margin-bottom: 1.5rem;
}
label {
display: block;
margin-bottom: 0.5rem;
font-weight: bold;
color: #555;
}
input[type="email"] {
width: 100%;
padding: 0.8rem;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 1rem;
outline: none;
transition: border-color 0.3s;
}
input[type="email"]:focus {
border-color: #007bff;
}
.error-message {
color: #d9534f;
font-size: 0.9rem;
margin-top: 0.5rem;
}
.success-message {
color: #5cb85c;
font-size: 0.9rem;
margin-top: 0.5rem;
}
button {
width: 100%;
padding: 0.8rem;
background-color: #007bff;
color: #ffffff;
border: none;
border-radius: 4px;
font-size: 1rem;
cursor: pointer;
transition: background-color 0.3s;
}
button:hover {
background-color: #0056b3;
}
.imgDiv {
height: 100px;
width: 100px;
margin: auto;
margin-bottom: 20px;
}
.imgDiv img {
height: 100%;
width: 100%;
object-fit: contain;
}
.form-container h2 {
margin-bottom: 20px;
}
@media (max-width: 480px) {
.form-container {
padding: 1.5rem;
}
button {
font-size: 0.9rem;
}
}
</style>
</head>
<body>
<div class="form-container">
<div class="imgDiv">
<img src="https://placehold.co/400x300/2ecc71/ffffff?text=Logo" alt="jtpLogo" />
</div>
<h2>Email Validation Form</h2>
<form id="emailForm" novalidate>
<div class="form-group">
<label for="email">Email Address</label>
<input
type="email"
id="email"
name="email"
placeholder="Enter your email"
required
/>
<div id="message" class="error-message"></div>
</div>
<button type="submit">Submit</button>
</form>
</div>
<script>
document.getElementById("emailForm").addEventListener("submit", function (event) {
const emailInput = document.getElementById("email");
const messageDiv = document.getElementById("message");
messageDiv.textContent = "";
if (!emailInput.validity.valid) {
event.preventDefault();
if (emailInput.validity.valueMissing) {
messageDiv.textContent = "Please enter an email address.";
} else if (emailInput.validity.typeMismatch) {
messageDiv.textContent = "Please enter a valid email address.";
}
} else {
messageDiv.textContent = "Email is valid!";
messageDiv.className = "success-message";
}
});
</script>
</body>
</html>
Output:
2. Advanced Regex for Comprehensive Validation
Regular expressions serve as an excellent tool for verifying the format of various inputs. This encompasses elements such as special characters, subdomains, and top-level domains, which is why a regex pattern designed for validating an email should be quite sophisticated.
Code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Email Validation Regex</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: Arial, sans-serif;
background-color: #f5f5f5;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
}
h2 {
margin-bottom: 40px;
}
.form-container {
background-color: #ffffff;
padding: 2rem;
border-radius: 8px;
box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
width: 100%;
max-width: 400px;
}
.form-container h2 {
margin-bottom: 1rem;
color: #333;
text-align: center;
}
.form-group {
margin-bottom: 1.5rem;
}
label {
display: block;
margin-bottom: 0.5rem;
font-weight: bold;
color: #555;
}
input[type="email"] {
width: 100%;
padding: 0.8rem;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 1rem;
outline: none;
transition: border-color 0.3s;
}
input[type="email"]:focus {
border-color: #007bff;
}
.error-message {
color: #d9534f;
font-size: 0.9rem;
margin-top: 0.5rem;
}
.success-message {
color: #5cb85c;
font-size: 0.9rem;
margin-top: 0.5rem;
}
button {
width: 100%;
padding: 0.8rem;
background-color: #007bff;
color: #ffffff;
border: none;
border-radius: 4px;
font-size: 1rem;
cursor: pointer;
transition: background-color 0.3s;
}
button:hover {
background-color: #0056b3;
}
.imgDiv {
height: 100px;
width: 100px;
margin: auto;
margin-bottom: 20px;
}
.imgDiv img {
height: 100%;
width: 100%;
object-fit: contain;
}
.form-container h2 {
margin-bottom: 20px;
}
@media (max-width: 480px) {
.form-container {
padding: 1.5rem;
}
button {
font-size: 0.9rem;
}
}
</style>
</head>
<body>
<div class="form-container">
<div class="imgDiv">
<img src="https://placehold.co/400x300/2ecc71/ffffff?text=Logo" alt="jtpLogo" />
</div>
<h2>Email Validation Form</h2>
<form id="emailForm">
<div class="form-group">
<label for="email">Email Address</label>
<input
type="email"
id="email"
name="email"
placeholder="Enter your email"
/>
<div id="message" class="error-message"></div>
</div>
<button type="submit">Submit</button>
</form>
</div>
<script>
document
.getElementById("emailForm")
.addEventListener("submit", function (event) {
event.preventDefault();
const emailInput = document.getElementById("email");
const messageDiv = document.getElementById("message");
const email = emailInput.value.trim();
// Regular expression for email validation
const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
if (emailRegex.test(email)) {
messageDiv.textContent = "Email is valid!";
messageDiv.className = "success-message";
} else if (email === "") {
messageDiv.textContent = "Please enter email address.";
messageDiv.className = "error-message";
} else {
messageDiv.textContent = "Please enter a valid email address.";
messageDiv.className = "error-message";
}
});
</script>
</body>
</html>
Output:
1) What is validation for an email?
Email validation refers to a collection of processes employed to verify whether an email address adheres to the appropriate syntax and meets the established standards for email addresses.
2) How to validate an email with regex?
Utilize the following regular expression: /^[\w\.-]+@[a-zA-Z\d\.-]+\.[a-zA-Z]{2,}$/
3) How do I validate email format?
You can confirm its format using regular expressions or leverage the inherent email validation features available.
4) Methods to Validate Email Addresses in JavaScript Without Utilizing Regular Expressions
Validating an email address can often be achieved through the use of regular expressions; however, there are alternative approaches to accomplish this task in JavaScript without relying on regex. Here are some methods to consider:
- Using String Methods: You can leverage built-in string functions to check if an email address adheres to a basic format. Here’s a simple example:
- Splitting the String: Another technique involves splitting the email string into parts based on the '@' character. This could help in confirming that there is only one '@' and that it is positioned correctly. For instance:
- Basic Length Checks: It is also important to ensure that the email address is of reasonable length. While not a foolproof method, it can help filter out obviously incorrect entries:
- Combining Methods: For a more robust solution, you can combine the above methods to enhance your validation process. For example:
function validateEmail(email) {
const atSymbolIndex = email.indexOf('@');
const dotIndex = email.lastIndexOf('.');
// Check if '@' and '.' exist in the email and are in the correct order
if (atSymbolIndex > 0 && dotIndex > atSymbolIndex + 1 && dotIndex < email.length - 1) {
return true;
}
return false;
}
function validateEmail(email) {
const parts = email.split('@');
// Ensure there's exactly one '@' and that the domain part has a '.'
if (parts.length === 2 && parts[1].indexOf('.') > 0) {
return true;
}
return false;
}
function validateEmail(email) {
if (email.length > 5 && email.length < 255) {
// Further validation can be applied here
return true;
}
return false;
}
function validateEmail(email) {
const atSymbolIndex = email.indexOf('@');
const dotIndex = email.lastIndexOf('.');
const parts = email.split('@');
if (atSymbolIndex > 0 && dotIndex > atSymbolIndex + 1 && dotIndex < email.length - 1 &&
parts.length === 2 && parts[1].indexOf('.') > 0 &&
email.length
We have the option to either use the HTML5 input element that comes with the type attribute set to "email" or implement email input validation through JavaScript.
5) How can you implement regex for validating email addresses in JavaScript?
The JavaScript regular expression used for validating email addresses is:
/^[\w\.-]+@[a-zA-Z\d\.-]+\.[a-zA-Z]{2,}$/
## Conclusion
A crucial element in the creation of web applications that feature a dependable and user-friendly interface is the process of Email validation in JavaScript. This can range from basic string checks to the implementation of regular expression (regex) validations, or even taking advantage of HTML5 capabilities.