/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

21 votes268 views4 answers
Check one checkbox at a time jquery
Javascript jQuery
0 vote322 views4 answers
Add edit delete from table using jquery
Javascript jQuery
2 votes297 views2 answers
Jquery ajax 500 error handling
Javascript jQuery
1 vote291 views1 answer
Jquery get nested element
Javascript jQuery
0 vote324 views1 answer
Force click btn using jquery
Javascript jQuery
1 vote310 views1 answer
Jquery vdn
Javascript jQuery
0 vote352 views1 answer
Bootstrap carousel dynamic height jquery
Javascript jQuery
6 votes271 views2 answers
Jquery get version in console
Javascript jQuery
2 votes317 views1 answer
Jquery change picture onclick
Javascript jQuery
0 vote310 views1 answer
Jquery check if input is empty on keyup
Javascript jQuery