/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

1 vote99 views1 answer
How to remove id in jquery
Javascript jQuery
0 vote102 views1 answer
Change background color input jquery
Javascript jQuery
9 votes105 views3 answers
JQuery change href value
Javascript jQuery
0 vote113 views1 answer
Current date jquery and current day
Javascript jQuery
26 votes112 views6 answers
Jquery get radio checked value
Javascript jQuery
1 vote121 views1 answer
Check textbox is empty in jquery
Javascript jQuery
41 votes104 views6 answers
Jquery append div
Javascript jQuery
1 vote105 views1 answer
Jquery loop each tr in table grepper
Javascript jQuery
0 vote143 views1 answer
How to set name attribute in jquery
Javascript jQuery
0 vote158 views1 answer
How to toggle fa fa-caret-down and fa fa-caret-up using jquery
Javascript jQuery