/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

0 vote205 views1 answer
Jquery for element which doesnt exist on page load
Javascript jQuery
1 vote181 views1 answer
Jquery ajax delete
Javascript jQuery
0 vote185 views2 answers
Loading page for all ajax call in jquery 3.3.1
Javascript jQuery
0 vote221 views4 answers
Jquery confirm dialog
Javascript jQuery
0 vote188 views1 answer
Jquery AND operation
Javascript jQuery
0 vote173 views1 answer
Jquery each check if last index
Javascript jQuery
55 votes183 views5 answers
Refresh div jquery
Javascript jQuery
3 votes137 views2 answers
Checkbox on click jquery
Javascript jQuery
2 votes177 views1 answer
Dropdown validation using jquery
Javascript jQuery
0 vote226 views1 answer
Get the placeholder value jquery
Javascript jQuery