Jquery Ajax Submit to API Example with Complete PostBack

jquery-ajax-submit.js

   $.ajax({
      type: 'GET',
  	  url: reportsUrl,
  	  beforeSend : function(xhr) {
          var base64 = Base64.encode(username + ":" + password);
          xhr.setRequestHeader("Authorization", "Basic " + base64);
        },
  	  contentType: 'plain/text',
  	  xhrFields: {
      withCredentials: true 
  	  },
  	  //username: username,
  	  //password: password,
  	  headers: {},
  	  success: function (json) {
        reports = json;
        updateReportsTables();
	  },
	  error: function() {
	  $('#div').html("<p>Error.</p>");
	  },
	  complete : function () {
        displayLoading(false);
      }
	});