ctrl.js

.controller('TreeDemoCtrl', function($scope, $http, $log) {
    $scope.list = [];

    $http.get('tx_1.json')
    // $http.get('taxonomy.json')
     .then(function(res){
        $scope.list = res.data;
      });


    $scope.selectedItem = {};
    $scope.options = {};

    $scope.remove = function(scope) {
      scope.remove();
    };
    $scope.editItem = function(item) {
      item.editing = true;
    };
    // $scope.cancelEditingItem = function(item) {
    //   item.editing = false;
    // };

    $scope.saveItem = function(item) {
      // group.save();
      item.editing = false;
    };
    $scope.toggle = function(scope) {
      scope.toggle();
    };
    $scope.lazyLoad = function(item) {

      debugger;

      if(_.isUndefined(item.items))
      {
        $http.get('tx_1.json')
         .then(function(res){
            item.items = res.data;
          });
      }

      $log(item.id);
      // $scope.toggle();
    };
    return $scope.newSubItem = function(scope) {
      var nodeData;
      nodeData = scope.$modelValue;
      nodeData.items.push({
        id: nodeData.id * 10 + nodeData.items.length,
        title: nodeData.title + "." + (nodeData.items.length + 1),
        items: []
      });
    };
  })