Framework7 svelte submit form not working

1

HTML code is:

<form id="imageForm" action="javascript:void(0)" enctype="multipart/form-data">
  <input type="file" id="input" name="picture">
  <input type="submit" value="Upload">
</form>

JS code is:

$('#imageForm').on('submit', function(){
  var formDdata=document.getElementById('input').files[0];
       app.request.post('photo_load.php', { formDdata: formDdata  },
         function (data){    
          console.log( data );
         });
});