<input class="form-control mousetrap valid" id="weighing_scale_barcode" placeholder="Deneme1" name="weighing_scale_barcode" type="text" aria-invalid="false">

<script type="text/javascript">                           
var input = document.getElementById("weighing_scale_barcode");
input.addEventListener("keyup", function(event) {
  if (event.keyCode === 13) {    
   event.preventDefault();    

    document.getElementById("weighing_scale_submit").click();  }
  $(function(){  $("#weighing_scale_barcode").focus();});});</script>