validation - Errors are not displaying in Ajax with laravel5 -



when i'm trying return error or make form returns error inputs. doesn't return (i've tried use console.log , it's working fine), when success part, message returns success. errors not appending <ul> tag. why that? please see code below.

register.blade.php

<!doctype html> <html lang="en"> <head>     <meta charset="utf-8">     <meta name="viewport" content="width=device-width, initial-scale=1.0">     <meta http-equiv="x-ua-compatible" content="ie=edge">     <meta name="csrf-token" content="{{ csrf_token() }}" />     <title>document</title>     <style>         *{             font-family: arial, sans-serif;         }          body{             background: lightslategray;         }          .container-fluid{             width: 1100px;             margin: 0 auto;             border-radius: 3px;             background: #fff;             padding: 15px 20px;             min-height: 700px;         }          form ul, .alert ul{             padding-left: 0;         }          form ul li{             list-style: none;             margin-bottom: 10px;         }          .alert{             display: none;             color: #c11111;             background: #ffe4e8;             padding: 10px 20px;         }          .alert ul li{             list-style: none;         }      </style> </head> <body>      <div class="container-fluid">         <div class="alert">             <ul></ul>         </div>          <form action="" method="post">             <ul>                 <li>                     username<br>                     <input type="text" name="username" id="username">                  </li>                 <li>                     password<br>                     <input type="password" name="password" id="password">                  </li>                 <li>                     password again<br>                     <input type="password" name="password_again" id="password_again">                  </li>                 <li>                     email<br>                     <input type="email" name="email" id="email">                  </li>                 <li>                     <button type="submit">submit</button>                 </li>              </ul>         </form>      </div>  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <script>     $(document).ready(function(){         var alerts = $('.alert');         $('form').submit(function(e){             e.preventdefault();              // formdata             var formdata = new formdata();             formdata.append('username', $('#username').val());              $.ajax({                 headers: {                     'x-csrf-token': $('meta[name="csrf-token"]').attr('content')                 },                 url: 'registers',                 method: 'post',                 processdata: false,                 contenttype: false,                 cache: false,                 datatype: 'json',                 data: formdata,                 success: function(data){                      alerts.hide().find('ul').empty();                      if(!data.success){                         $.each(data.errors, function(index, error){                             alerts.find('ul').append('error');                         });                         alerts.slidedown();                     } else{                         alerts.find('ul').append('success');                         alerts.slidedown();                     }                 },                 error: function(){}             });         });      }); </script> </body> </html> 

authcontroller.php

public function postregister(){         $validator = validator::make(             [                 'username' => input::get('username')             ],             [                 'username' => 'required|max:6|min:3'             ]         );          if($validator->fails()){             return response::json([                 'success' => false,                 'error' => $validator->errors()->toarray()             ]);         }          // if validated         return response::json(['success' => true]);     } 

routes.php

// using jquery route::get('/register', [     'as' => 'auth.register',     'uses' => 'authcontroller@getregister' ]);  route::post('/registers', [     'as' => 'auth.registers',     'uses' => 'authcontroller@postregister' ]); 


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