javascript - jquery not recognizing $(this) -


i have following html , javascript:

html:

<div class="container">   <div class="row">   <div class="col-md-6 col-md-offset-3">     <div class="well">       <form id="registration-form" class="text-center" method="post" role="form">         <h1>registro</h1>         <hr>           <div class="form-group">           <label class="control-label" for="username">nombre de usuario</label>            <input type="text" class="form-control" placeholder="nombre" name="username"          id="username" autofocus>     </div>     <div class="form-group">       <label class="control-label" for="useremail">correo</label>       <input type="email" class="form-control" placeholder="correo" name="useremail" id="useremail">     </div>     <div class="form-group">       <label class="control-label" for="userpassword">contraseña</label>       <input type="password" class="form-control" placeholder="contraseña" name="userpassword" id="userpassword">     </div>     <hr>       <button type="submit" name="cmdnewuserregister" id="cmdnewuserregister" class="btn btn-success">registrar</button>   </form>   </div> </div>


and following jquery: 

var application = {    init: function(){     $('#username, #userpassword, #useremail').on('keyup', isempty);     $('#useremail').on('keyup', isemail);   },   isempty: function(){     if($(this).val().length > 0){       $(this).parent().addclass('has-success').removeclass('has-error');     } else $(this).parent().removeclass('has-success').addclass('has-error');   },   isemail: function(){     var emailregex = new regexp(/^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00a0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00a0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00a0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00a0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00a0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef])|(([a-z]|\d|[\u00a0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef])([a-z]|\d|-|\.|_|~|[\u00a0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef])*([a-z]|\d|[\u00a0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef])))\.)+(([a-z]|[\u00a0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef])|(([a-z]|[\u00a0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef])([a-z]|\d|-|\.|_|~|[\u00a0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef])*([a-z]|[\u00a0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef])))\.?$/i);     if(emailregex.test($(this).val())){       $(this).parent().removeclass('has-error').addclass('has-success');     } else $(this).parent().removeclass('has-success').addclass('has-error');   } };  $(document).ready(function(){   //se inicializa el objeto:    application.init();   //validación de correo });

apparently, isn't working since classes not applied. can spot problem, here pen it:

codepen sample

isempty , isemail not defined. you'll need replace them application.isempty , application.isemail, respectively.


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