AngularJs中的另一個指令的呼叫控制器

Question

如何從$ apply指向相同元素的另一個指令中的指令控制器函數？例如：

<myelement hint="myelement.controller.getMe()">hoverMe</myelement> 

app.directive("myelement", function() { 
    return { 
     restrict: "E", 
     controller: function ($scope) { 
      this.getMe = function() { 
       return "me"; 
      }; 
     } 
    } 
}); 

app.directive("hint", function() { 
    return { 
     restrict: "A", 
     controller: function ($rootScope) { 
      this.showHint = function (getMsg) { 
      alert($rootScope.$apply(getMsg)); //what should be written here? 
      } 
     }, 
     link: function (scope, element, attrs, controller) { 
      element.bind("mouseenter", function() { 
       controller.showHint(attrs.hint); 
      }); 
     } 
    } 
}); 

來源：http://plnkr.co/edit/9qth9N?p=preview

Answer 1

使用要求（閱讀更多關於它here）。

app.directive("hint", function() { 
    return { 
    restrict: "A", 
    require: ["myelement", "hint"], 
    controller: function ($scope) { 
     this.showHint = function (msg) { 
     alert($scope.$apply(msg)); //what should be written here? 
     } 
    }, 
    link: function (scope, element, attrs, ctrls) { 
     var myElementController = ctrls[0], 
      hintController = ctrls[1]; 

     element.bind("mouseenter", function() { 
      hintController.showHint(myElementController.getMsg()); 
     }); 
    } 
    } 
}); 

---

UPDATE（約製作提示普遍，見下面的評論）

爲了提示指令普及，比你能使用$範圍，因爲它們之間的媒介。

app.directive("myelement", function() { 
return { 
    restrict: "E", 
    controller: function ($scope) { 
     $scope.getMe = function() { 
      return "me"; 
     }; 
    } 
} 
}); 

<myelement hint="getMe()">hoverMe</myelement> 

唯一的變化是，getMe消息沒有在所述控制器（this.getMe），但在$範圍（$scope.getMe）設置好的。