how can i define the plugin default settings value.. a calculated object or ajax call..

how can i define the plugin default settings value.. a calculated object or ajax call..

on jquery 1.8.3

hello
this is my first plugin..
how can i define the plugin default settings value.. a calculated object or ajax call..
that cade just not working..
the function on the setting data - not working...

  2. (function ($) {
  3.     $.fn.treeview = function (options) {

  5.         // plug default virtuals
  6.         var settings = $.extend({            
  7.             data: (function () {
  8.                 this.data = "i am DATA from pluging default setings";
  9.                 //return "i am DATA from pluging default setings";
  10.             }),
  11.             rootName: "none",
  12.             isExpandAll: false,
  13.             isLoadCss: true,
  14.             containerID: null

  16.         }, options)


  19.         function loadTree(callback) {

  21.             if (!settings.data) { alert("treeview plugin data:null"); return; }
  22.             alert(settings.data);
  23.             
  24.             if (callback) callback();
  25.         }        
  26.     }
  27. }(jQuery));

and calling for that plug


  3.             $.getScript("../../../resource/js/lib/treeview/treeview.Plugin.js", function () {
  4.                 $.fn.treeview({
  5.                     //data: {},
  6.                     isExpandAll: false,
  7.                     containerID: "xxx"
  8.                 });
  9.             }).success(function (e) {
  10.                 //alert(1);
  11.             }).fail(function (e) { alert(2); });