Email validation using javascript
function checkEmail() {
var email = document.getElementById('txtEmail');
var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
if (!filter.test(email.value)) {
alert('Please provide a valid email address');
email.focus;
return false;
}
}
- Call the function on Email textboxemail validation js
/// if you want create your regular expression then you can follow this site
/////https://regex101.com///////
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<form method="post" action="">
Email:<input type="text" id="email" onkeyup="validation()">
</form>
</body>
<script type="text/javascript">
function validation(){
var email=document.getElementById("email").value;///get id with value
var emailpattern=/^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/;////Regular expression
if(emailpattern.test(email))
{
document.getElementById("email").style.backgroundColor='yellow';
}
else
{
document.getElementById("email").style.backgroundColor='red'; }
}
</script>
</html>Copyright © 2021 Codeinu
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