FormData Example with File from the input element

formdata-example.js

var file = $('#order_file').prop('files')[0];
var form_data  = new FormData();
form_data.append('order_file',file)
$.each($('#ordercreate').serializeArray(), function (key, input) {
if (form_data.has(input.name)) {
  form_data.set(input.name, input.value);
  } else {
    form_data.append(input.name, input.value);
  }
});

// console.log(form_data); // This will return an empty object, so dont worry!
for (var key of form_data.entries()) {
  console.log(key[0] + ', ' + key[1]);
}