AJAX alternative of using jQuery form UI
You can use jQuery's AJAX function for this directly and, you can pass object literals as parameters without using the form elements.

var params = {id : '1234'};
$.ajax({
  type: 'GET',
  url: url, // action attribute from form element 
  data: JSON.stringify(params),
  contentType: 'application/json; charset=utf-8',
  dataType: 'json', 
  success: function (result) {
      console.log(result);
  },
  error: errorFunc
});


Documentation can be found here.