JQuery Email已经注册

Question

Can any body help me.. i have some problem in jquery email validation, i want to check that this email has already registered or not.. i have tried but my code is not working (i.e did not show error message)

here is the script

$(document).ready(function(){   
    $("add_form").validate( {
       rules: {  
           email: {
        required: true,
        email: true,
            remote: "emails.php"
    },
 },
 messages: {
         email:   {
    remote: jQuery.format("{0} is already in use")
        }
 },
 });

and emails.php file code here

 <?php
$request = trim(strtolower($_REQUEST['email']));

require 'db.inc.php';
$db = mysql_connect(MYSQL_HOST, MYSQL_USER, MYSQL_PASSWORD) or
die ('Unable to connect. Check your connection parameters.');
mysql_select_db(MYSQL_DB, $db) or die(mysql_error($db));


$query = 'SELECT email FROM Users WHERE email="'.$request.'"';
$result = mysql_query($query, $db) or die(mysql_error());
$valid = 'true';
if (mysql_num_rows($result)>0) 
{
    $valid = '"Thats already taken."';
}
echo $valid;

?>

Answer 1

According to the docs, the response of remote validation is a JSON-encoded boolean, not a JSON-encoded string.

You have "true" or "false", which will become "\"true\"" or "\"false\"" through json_encode(), which is wrong. Actual true or false will become "true" or "false", which is correct.

Setting the response content type to JSON might also be a good idea:

header('Content-type: application/json');