jquery ajax fileupload

jquery_ajax_file_upload.js

$('#file').change(function(){
  var formData = new FormData();
  var current  = $(this);
  formData.append("file", $(this)[0].files[0]);
  // additional data
  formData.append("id", "1");

  var promise = $.ajax({
      url: "url",
      type: 'post',
      data: formData,
      processData: false,
      contentType: false
  });

  promise.done(function(result){
      // event when upload done
  });
});