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jQuery to validate Email Address Validation

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Here is an example program of validating the Email address using the jQuery API.

jQuery to validate Email Address

     

In this  jQuery tutorial we will develop a  program that validate the email address  from server and displays on the user browser. In this example we will be calling a server side PHP script to get the "result". You can easily replace PHP with JSP, or ASP program.

Steps to develop the  program for Email Address Validation

Step 1:

Create php file to that prints the current server data. Here is the code of PHP script (emailValidation.php).

<?

$email = $_GET['email'];


function isValidEmail($email){
return eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $email);
}

if($email=="")
{
$errormsg="error1";
}
if(!isValidEmail($email) && $email!="")
{
$errormsg="error2";
}


echo $errormsg;
?>

Step 2:

Write HTML page to call the emailValidation.php. Create a new file (emailvalidation.html) and add the following code into it:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" 
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<style>
.error{
color:red;
}
</style>
<title>E-Mail Validation</title>
<script type="text/javascript" src="jquery-1.2.6.js">
</script>
<script type="text/javascript"> 
function emailValidate()
{


email = document.getElementById("email").value;


$.ajax({
url : "emailvalidation.php?email="+email,
success : function (data) {

if(data=="error1") {
document.getElementById("erroremail")
.innerHTML="Please enter email.";
}
else if(data=="error2")
{
document.getElementById("erroremail")
.innerHTML="Please enter valid email.";
}
}
});


}
</script> 
</head>
<form name="emailvalidate" action="" method="post" >


<div><input type="hidden" name="query" value="" />
</div>
<table>
<tr><td colspan=2>&nbsp;<div id="errormsg">
</div></td></tr>

<tr>
<th align="left"><label for="email">Email</label>
</th>
<td>
<input type="text" id="email" name="email" size="20" />
</td>
<td id="erroremail" class="error">
</td>
</tr>
<tr>
<td></td>
<td><input type="button" name="Submit" 
value="Submit" onClick="emailValidate();"/></td>

</tr>
</table>


</form>

</html>

Program explanation:

The following code includes the jQuery JavaScript library file:

<script type="text/javascript" src="jquery-1.2.6.js"></script>

On Click on the Button  emailValidate() funcation is called:

<input type="button" name="Submit" value="Submit" onClick="emailValidate();"/>

 

The code

$.ajax({

url : emailValidation.php
...

makes ajax call to emailValidation.php file get the Text parameter  "email".

This file call the ValidEmail($email) this match with regular expression return error messages ;

Following code intercepts the ajax call success and then sets the data into "erroremail" div:

success : function (data) {

if data equals to "error1"  It means You not entered the E-mail Address;

if data equals to "error2"  It means You not entered the valid E-mail Address;
}

});

When you run the program in browser it will look like following screen shot:

 

Check online demo of the application

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Posted on: April 18, 2011

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