Getting a value back from a JavaScript function within a prototype.

code:

  var jsonp = {    currentscript: null,    getjson: function(url, data, callback) {      var src = url + (url.indexof("?")+1 ? "&" : "?");      var head = document.getelementsbytagname("head")[0];      var newscript = document.createelement("script");      var params = [];      var param_name = ""        this.success = callback;        data["callback"] = "jsonp.success";      for(param_name in data){        params.push(param_name + "=" + encodeuricomponent(data[param_name]));      }      src += params.join("&");        newscript.type = "text/javascript";      newscript.src = src;        if(this.currentscript) head.removechild(currentscript);      head.appendchild(newscript);    },    success: null  };      function jsontables(element) {    // vars    this.element = element; // id of table      this.url = "https://webservices.mysite.com/table";    this.data = {      timestamp: (+new date()),      idisplaystart: idisplaystart,      idisplaylength: limit,      icolumns: 6,      isortingcols: 1,      isortcol_0: current_sort_order,      ssortdir_0: current_sort_type,      ssearch: filter    };    jsonp.getjson(this.url, this.data, function(data) {      this.jsondata = data;      console.log(this.jsondata); // 1 displays ok    });      console.log(this.jsondata); // 1 error      // draws table    this.drawtable();      // makes sortable    this.sortable();  };  

in code here have problem console.log in jsonp.getjson returning outputting data console, 1 labeled "this error" says undefined.

how go getting data this.jsondata?

 

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