AngularJS 如何从控制器组件外部调用控制器功能

它工作完美，当我按“获取”按钮。但我需要从外部的div控制器调用它。逻辑是：默认情况下我的div是隐藏的。在导航菜单中的某处我按下一个按钮，它应该显示()我的div并执行“get”函数。我该如何实现呢？

我的网页是：

<div ng-controller="MyController">
  <input type="text" ng-model="data.firstname" required>
  <input type='text' ng-model="data.lastname" required>

  <form ng-submit="update()"><input type="submit" value="update"></form>
  <form ng-submit="get()"><input type="submit" value="get"></form>
</div>

我的js：

function MyController($scope) {
      // default data and structure
      $scope.data = {
        "firstname" : "Nicolas","lastname" : "Cage"
      };

      $scope.get = function() {
        $.ajax({
           url: "/php/get_data.php?",type: "POST",timeout: 10000,// 10 seconds for getting result,otherwise error.
           error:function() { alert("Temporary error. Please try again...");},complete: function(){ $.unblockUI();},beforeSend: function(){ $.blockUI()},success: function(data){
            json_answer = eval('(' + data + ')');
            if (json_answer){
                $scope.$apply(function () {
                  $scope.data = json_answer;
            });
            }
        }
    });
  };

  $scope.update = function() {
    $.ajax({
        url: "/php/update_data.php?",data: $scope.data,otherwise error.
        error:function() { alert("Temporary error. Please try again...");},success: function(data){ }
      });
    };
   }