javascript - Can't get all form data -

i looked everywhere on internet. still stuck ... here's i'm stuck : did form looks :

a multipart form, 2 inputs : data & selectable item.

the problem : i'm lost dropzone, because know i've declare programmatically (because it's part of form). file data , not select option. (java servlet good, after researchs, problem in .jsp / .js files).

here's .jsp :

        <form action="upload" id="myform" method="post"         enctype="multipart/form-data">         <div id="mydz" class="dropzone dz-clickable hvr-outline-out" style="margin-bottom: 5px;">             <div class="fallback">                 <input name="datafile" type="file" />             </div>         </div>          <div id="procedure">             procédure : <select name="procedure">                 <option value="1">toulouse</option>                 <option value="2">tournefeuille</option>                 <option value="3">cine 6</option>                 <option value="4">cinéland</option>             </select>                  <input type="submit" id="sbmtbtn" value="envoyer" />         </div>                     <script type="text/javascript" src="views/js/createdropzone.js"></script>     </form> 

and here's .js called after creating form fields :

    dropzone.autodiscover = false;  var mydropzone = new dropzone("#mydz",         {     url : 'upload',// action à appeler      /* options */     acceptedfiles: ".pdf", // seulement les pdfs.     addremovelinks : true,     autoprocessqueue : false, // important dont want form submitted unless have clicked submit button     uploadmultiple: false,     paralleluploads: 1,     maxfiles: 1,     autodiscover : false,     paramname : 'datafile', // similar giving name input type file <input type="file" name="pic" />     clickable : true, // tells dropzone not clickable . have because v dont want whole form clickable      accept : function(file, done) {         console.log("ajouté");         done();     },     error : function(file, msg) {         alert(msg);     },     init : function() {          //ajout possible de seulement 1 fichier         this.on("addedfile", function() {             if (this.files[1]!=null){                 this.removefile(this.files[0]);             }         });          //envoi du fichier         document.getelementbyid("sbmtbtn").onclick = function(e) {             e.preventdefault(); //this prevent default behaviour of submit button because want dropzone submit form             mydropzone.processqueue(); // submit form specified action directs jsp upload code             // after this, whole form submitted inputs + files , jsp code remain usual              //remember don't have call ajax or submit inputs, dropzone take care of         };      } // init end         }); 

and, did datas servlet : https://stackoverflow.com/a/13321215/4944071

i need new pov, if can ...