javascript - jQuery validate.js only email is not being validated -

i using validate.js validate sign-up form. works fine other fields don't understand why not affect email field.

here validation script:

<script type="text/javascript">     $(document).ready(function(){     $("#signup").validate({     errorelement: 'div',     rules:{         "display_name":{             required: true,             minlength: 5         },         "user_email":{             required:true,               email: true,             remote: {                 url: "user/checkemail.php",                 type: "post"             }         },         "password":{             required:true,             minlength:6         },         "confirm_password":{             required:true,             equalto: "#password"         }     },     messages: {         display_name:{                     required: "please provide desired display name",                     minlength: "your display name must @ least 5 characters long"                     },         user_email:{                     required: "please provide valid email",                     email: "this not valid email!",                     remote: "email in use!"                     },          password: {                     required: "please provide password",                     minlength: "your password must @ least 6 characters long"                     },          confirm_password: {                     required: "please provide confirm password",                     equalto: "please enter same password above"                     }         }        });        });  </script> 

i have tried different ways make work doesn't. here form:

<form class="form-horizontal" name="signup" id="signup" method="post" action="users/register_submit.php" enctype="multipart/form-data">             <fieldset>                 <!-- form name -->                 <legend>sign up</legend>                 <!-- text input-->                 <div class="form-group">                     <label class="col-md-4 control-label" for="name">display name</label>                       <div class="col-md-6">                         <input id="display_name" name="display_name" type="text" placeholder="" class="form-control input-md" required>                     </div>                 </div>              <!-- text input-->             <div class="form-group">               <label class="col-md-4 control-label" for="email">email</label>                 <div class="col-md-6">                     <input id="email" name="user_email" type="email" placeholder="example@abc.com" class="form-control input-md" required>                 </div>             </div>              <!-- password input-->             <div class="form-group">               <label class="col-md-4 control-label" for="password">password</label>               <div class="col-md-6">                 <input id="password" name="password" type="password" class="form-control input-md" required>                 <span class="help-block">at least 6 characters</span>               </div>             </div>              <!-- confirm-password input-->             <div class="form-group">               <label class="col-md-4 control-label" for="confirm_password">confirm password</label>               <div class="col-md-6">                 <input id="confirm_password" name="confirm_password" type="password" placeholder="" class="form-control input-md" required>                 </div>             </div>                         <!-- button -->             <div class="form-group">               <label class="col-md-4 control-label" for="submit"></label>               <div class="col-md-4">                 <input id="submit" name="submit" type="submit" class="btn btn-primary">               </div>             </div>              </fieldset>         </form> 

please me. thanks

edit-update here code checkemail.php. have tested , working fine if test separately.

<?php require_once("../app/utilities/databaseutility.php");  require_once("../app/helpers/databasehelper.php");      function isemailexists($email){             $res = array();             $db = new databaseutility('apex');             $dbh = new databasehelper;             $db->connect();             $col_array = array("user_email");             $values = array($email);             if( $statment = $db->preparestatment('select '.$dbh->getcolumns($col_array).' users user_email = '.$dbh->getplaceholders($col_array).'')){                 $db->bindparam($statment, $dbh->getplaceholdersarray($dbh->getplaceholders($col_array)), $values, $dbh->getbindtypes($values));                 $statment->execute();                 $res = $statment->fetch();                 if(!empty($res)){                     if(in_array($email,$res)){                         echo "false";                     }                     else                         echo "true";                 }                 else                     echo "true";             }             else                 echo "someting wrong query";             $db->releaseresources();             }     $requestedemail  = $_request['email'];     isemailexists($requestedemail);  ?> 

change id of email input to: user_email

edit: made fiddle: https://jsfiddle.net/66oxokta/ seems working fine. doesn't work @ solution?

    user_email:{         required: "this works",         email: "this works",         remote: "didnt test this"     },