JavaScript is one of the most popular languages in Full-Stack, Front-end, and Back-end Development. It is used to create beautifully designed websites. In JavaScript, validation is used to authenticate a user. This article provides a step by step guide on Email validation in JavaScript in the following sequence:
What is Validation?
Validation is a method to authenticate the user. JavaScript provides the facility to validate the form on the client-side so data processing will be faster than server-side validation. It is preferred by most of the web developers. Through JavaScript, we can validate name, password, email, date, mobile numbers and more fields.
Client-side validation prevents the client from knowing whether the form is okay before reloading a page. Whereas, Server-side validation is important due to the fact that client-side validation can be completely bypassed by turning off JavaScript.
Now let’s move ahead and look at the steps involved in email validation in JavaScript.
Email Validation in JavaScript – Step by Step
Validating email is a very important point while validating an HTML form. An email is a string or a subset of ASCII characters that are separated into two parts by “@” symbol.
The first part can consist of the following ASCII Characters:
- Uppercase (A-Z) and lowercase (a-z) letters
- Digits (0-9)
- Characters such as ! # $ % & ‘ * + – / = ? ^ _ ` { | } ~
- Character . ( period, dot or fullstop) but it should not be the first or last character and should not come one after the other
The domain name consists of
- letters
- digits
- hyphens
- dots
To get a valid email id we use a regular expression /^w+([.-]?w+)*@w+([.-]?w+)*(.w{2,3})+$/. Now let’s see how this expression is used in the JavaScript Code to validate your email id:
email-validation.js
function ValidateEmail(inputText)
{
var mailformat = /^w+([.-]?w+)*@w+([.-]?w+)*(.w{2,3})+$/;
if(inputText.value.match(mailformat))
{
alert("You have entered a valid email address!"); //The pop up alert for a valid email address
document.form1.text1.focus();
return true;
}
else
{
alert("You have entered an invalid email address!"); //The pop up alert for an invalid email address
document.form1.text1.focus();
return false;
}
}
Now let’s apply the JavaScript function in the HTML form:
emailvalidation.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>JavaScript email validation</title> <link rel='stylesheet' href='form-style.css' type='text/css' /> //link to the source file of css to add styles </head> <body onload='document.form1.text1.focus()'> <div class="mail"> <h2>Enter email to Validate</h2> <form name="form1" action="#"> <ul> <li><input type='text' name='text1'/></li> <li> </li> <li class="Validate"><input type="submit" name="Validate" value="Validate" onclick="ValidateEmail(document.form1.text1)"/></li> //Adding the submit button <li> </li> </ul> </form> </div> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-wp-preserve="%3Cscript%20src%3D%22email-validation.js%22%3E%3C%2Fscript%3E" data-mce-resize="false" data-mce-placeholder="1" class="mce-object" width="20" height="20" alt="<script>" title="<script>" /> //link to the source file of javascript function </body> </html>
Now let’s add style to the form with the help of CSS:
form-style.css
li {list-style-type: none;
font-size: 16pt;
}
.mail {
margin: auto;
padding-top: 10px;
padding-bottom: 10px;
width: 800px;
background : rgb(153, 198, 211);
border: 1px soild rgb(1, 20, 24);
}
.mail h2 {
margin-left: 38px;
}
input {
font-size: 20pt;
}
input:focus, textarea:focus{
background-color: lightyellow;
}
input submit {
font-size: 10pt;
}
Now that you have created the form to validate email id, you will get the following output after executing the HTML code:
Output
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Now base on the format of the regular expression, if you enter a valid email id such as xyz@domain.com it will show the following alert:
But if you enter an email id that violates the rule of your regular expression format such as xyz#domain-co it will show the following alert:
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These were the different steps for email validation in JavaScript. I hope you understood how HTML, CSS and JavaScript are used together to build a validation form.
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