[Solved-5 Solutions] Valid email address in javascript - javascript turorial
Problem:
How to validate an email address in JavaScript ?
Solution 1:
Using regular expressions.
function validateEmail(email)
{
var re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
return re.test(email);
}
Regular expresion that accepts unicode:
var re = /^(([^<>()\[\]\.,;:\s@\"]+(\.[^<>()\[\]\.,;:\s@\"]+)*)|(\".+\"))@(([^<>()[\]\.,;:\s@\"]+\.)+[^<>()[\]\.,;:\s@\"]{2,})$/i;JavaScript can be easily disabled. This code is validate on server side.
function validateEmail(email)
{
var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
return re.test(email);
}
function validate()
{
$("#result").text("");
var email = $("#email").val();
if (validateEmail(email)) {
$("#result").text(email + " is valid :)");
$("#result").css("color", "green");
} else {
$("#result").text(email + " is not valid :(");
$("#result").css("color", "red");
}
return false;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
<p>Enter an email address:</p>
<input id='email'>
<button type='submit' id='validate'>Validate!</button>
</form>
<h2 id='result'></h2>Solution 2:
Using regular expression:
/\S+@\S+\.\S+/
Javascript function is used to validate email address.
function validateEmail(email)
{
var re = /\S+@\S+\.\S+/;
return re.test(email);
}
Solution 3:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JavaScript form validation - checking email</title>
<link rel='stylesheet' href='forms-style.css' type='text/css' />
</head>
<body onload='document.form1.text1.focus()'>
<div class="mail">
<h2>Input an email and Submit</h2>
<form name="form1" action="#">
<ul>
<li><input type='text' name='text1'/></li>
<li> </li>
<li class="submit"><input type="submit" name="submit" value="Submit" onclick="ValidateEmail(document.form1.text1)"/></li>
<li> </li>
</ul>
</form>
</div>
<script src="email-validation.js"></script>
</body>
</html>In JavaScript:
function ValidateEmail(inputText)
{
var mailformat = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
if(inputText.value.match(mailformat))
{
document.form1.text1.focus();
return true;
}
else
{
alert("You entered an invalid email address!");
document.form1.text1.focus();
return false;
}
}CSS:
li
{
list-style-type: none;
font-size: 16pt;
}
.mail {
margin: auto;
padding-top: 10px;
padding-bottom: 10px;
width: 400px;
background : #D8F1F8;
border: 1px soild silver;
}
.mail h2 {
margin-left: 38px;
}
input {
font-size: 20pt;
}
input:focus, textarea:focus{
background-color: lightyellow;
}
input submit {
font-size: 12pt;
}
.rq {
color: #FF0000;
font-size: 10pt;
}Solution 4:
Here there are lots of complexity.
\S+@\S+
Using this code to catches the most obvious errors then user can easily rectified the errors.
Solution 5:
function validateEmail(value) {
var input = document.createElement('input');
input.type = 'email';
input.required = true;
input.value = value;
return typeof input.checkValidity == 'function' ? input.checkValidity() : /\S+@\S+\.\S+/.test(value);
}