MVC4 ERROR

Question

ON PAGE LOAD WHEN GETACTIVITYLIST IS null and mode is create. 



var arr = [];

  var arractivity = [];
  $(document).ready(function () {
  var theme = getDemoTheme();
  // create jqxTree
  $("#jqxTree").jqxTree({ height: "400px", hasThreeStates: true, checkboxes: true, width: "330px", theme: theme });
  $("#jqxCheckBox").jqxCheckBox({ width: "200px", height: "25px", checked: true, theme: theme });
  if (document.getElementById('Mode').value == 'Create') {
  alert('hi1');
  $("#RoleName").val("");
  $("#RoleDescription").val("");
  $("#RoleStatus").val("");
  alert('hi2');
  }
  else {
  arractivity=new Array(@(Model.GetActivityList.Count));
  @for (var i = 0; i < @Model.GetActivityList.Count; i++)
  {
  <text>
  var index="@i"; 
  var act ="@Model.GetActivityList[i].ACTIVITY_ID";
  addElementToarractivityArray(act,index); 
  //alert(act); 
  </text>
  }
  var j;
  for (j = 0; j < arractivity.length; ++j) {
  var AvtivityId= (arractivity[j]);
  alert(AvtivityId);
  $('#jqxTree').jqxTree('checkItem', $("#"+AvtivityId)[0], true);
  alert(AvtivityId);
 
  }
  }
  });






on page load directly going in else block while if condition is true.please help. i am working in MVC. CSHTML PAGE