jquery - Can not get values from a form in javascript -

i'm trying values of different inputs of form:

<form class="form-horizontal" role="form" id="form_newcours">         <div class="form-group">             <label class="control-label col-sm-2" for="discipline">matiere:</label>             <div class="col-sm-4">                 <input type="text" class="form-control" id="discipline" placeholder="matiere">             </div>         </div>         <div class="form-group" align="left">             <label class="control-label col-sm-2" for="datetimepicker">date:</label>             <div class="input-group col-sm-4">                         <input type="text" class="form-control" id="datetimepicker"/>                         <span class="input-group-addon">                             <span class="glyphicon glyphicon-calendar"></span>                         </span>             </div>         </div>         <div class="form-group">             <div class="col-sm-offset-2 col-sm-10">               <div class="checkbox">                 <label><input type="checkbox" id="creneau_regulier"> ce creneau regulier</label>               </div>             </div>         </div>         <div class="form-group">             <div class="col-sm-offset-2 col-sm-10">               <button type="submit" class="btn btn-default" id="btn-newcours">ajouter</button>             </div>         </div>  </form> 

and have js code try values of inputs:

$('#btn-newcours').on('click', function(e) {      // stop form submitting , let handle following code:     e.preventdefault();      // yk: bellow code     var jsonstring = json.stringify($('#form_newcours').serializeobject());     console.log($('#form_newcours').serialize());     $.ajax({       type: "post",       data: jsonstring,       url: "/cours/",       contenttype: "application/json"     });   }); 

the function called, variable jsonstring empty. i'm not familiar js, can additionnal div between form , input cause problems ?

edit:

p.s. i'm using plugin serializeobject().

you should add name attribute inputs.