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jQuery to validate Email Address
Posted on: September 8, 2008 at 12:00 AM

In this jQuery tutorial we will develop a program that validate the email address from server and displays on the user browser.

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:

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

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

Learn from experts! Attend jQuery Training classes.

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