/Javascript/jQuery/JQuery Validate remote method usage to check if username already exists

JQuery Validate remote method usage to check if username already exists

//HTML
$("#signupForm").validate({
  rules: {
    username: {
      required: true,
      minlength: 3,
      remote: "check-username.php"
    }
  },
  messages: {
    username:{
      remote: "This username is already taken! Try another."
    }
  }
});

//PHP code of check-username.php
<?php

header('Content-type: application/json');
$request = $_REQUEST['username'];

$query = mysql_query("SELECT * FROM mmh_user_info WHERE username ='$username'");
$result = mysql_num_rows($query);
if ($result == 0){
$valid = 'true';}
else{
$valid = 'false';
}
echo $valid;
exit;
?>

Source: stackoverflow.com

Similar codes

23 votes157 views4 answers
Remove required attribute jquery
Javascript jQuery
2 votes150 views1 answer
How to set element readonly using jquery
Javascript jQuery
0 vote146 views1 answer
Differences between detach(), hide() and remove() - jQuery
Javascript jQuery
3 votes162 views4 answers
Jquery hover event
Javascript jQuery
0 vote150 views1 answer
Jqueryui droppable enable
Javascript jQuery
0 vote147 views1 answer
Jquery confirm delete massege
Javascript jQuery
0 vote155 views2 answers
Preview upload image jquery
Javascript jQuery
1 vote145 views1 answer
How select just before element in jquery
Javascript jQuery
5 votes155 views2 answers
Jquery remove disabled property from button
Javascript jQuery
2 votes172 views3 answers
Jquery set html of element
Javascript jQuery