AngularJS指令要求父指令不起作用

Question

我想用复选框(这是一个重复列表)指令制作一个类别树.

我做了一个名为categoriesTreeContainer的指令,它包含了所有类别列表

我做了另一个名为指令categoryItem是containes分类项目这是孩子categoriesTreeContainer

这就是我所做的categoriesTreeContainer:

myApp.directive('categoriesTreeContainer', function(){
return {
    restrict : 'E',
    template : '<category-item ng-repeat="category in categoriesTree" category="category"></category-item>',
    scope    : {
        categoriesTree : "=categoriestree",
        selectedCategories : "=ngModel",
    },

    controller : function($scope, $element, $attrs){
        $scope.selectedCategories = [];

        $scope.onSelectionChange = function(category){
            console.log('yah');
        }
    }
}

})

对于categoryItem:

myApp.directive('categoryItem', function($compile){
return {
    require: '^categoriesTreeContainer',
    restrict : 'E',
    //replace  : true,
    transclude : true,
    scope    : {
        category : "=category"
    },
    link     : function(scope, element, attrs, categoriesTreeCtrl){
        console.log(categoriesTreeCtrl);

        if(scope.category.subCategories.length>0){

            element.append($compile(
                '<div class="panel panel-default panel-treelist">'+
                '<div class="panel-heading"><h4 class="panel-title">'+
                '<label data-toggle="collapse" data-target="#{{category.$$hashKey}}">'+
                '<input type="checkbox" ng-change="categoriesTreeCtrl.onSelectionChange(category)"  ng-model="category.selected" />'+
                ' {{category.name}}</label></h4></div><div id="{{category.$$hashKey}}" class="panel-collapse collapse">'+
                '<div class="panel-body">'+
                '<category-item id="{{category.$$hashKey}}" ng-repeat="subCategory in category.subCategories" category="subCategory" categoriestree="categoriesTree" ng-model="selectedCategories">'+
                '</category-item></div></div></div>'
                )(scope))
        }else{
            element.append($compile('<label><input ng-change="categoriesTreeCtrl.onSelectionChange(category)" type="checkbox" ng-model="category.selected"> {{category.name}}</label><br/>')(scope));
        }
    }
}

})

在DOM中:

<categories-tree-container categoriestree="categoriesTree" ng-model="selectedCategories"></categories-tree-container>

树按我想要的方式呈现.问题是categoryItem指令中所需的控制器'^ categoriesTreeContainer'是void.我做了console.log(categoriesTreeCtrl)对categoriesTreeCtrl的链接功能,这是什么就是什么,我得到:

c {},一个虚空对象.

我究竟做错了什么？

Answer 1

这categoriesTreeCtrl将是void object因为控制器什么都没有.如果您需要categoriesTreeCtrl.onSelectionChange从子指令访问,则不应将其onSelectionChange作为其一部分$scope,而是将其定义为控制器的属性.

controller: function($scope, $element, $attrs){
      this.onSelectionChange = function(category){ ... };
 // $scope.onSelectionChange = function(category){...}
}

其他:
在categoriesTreeCtrl对孩子的指令是不相等$scope.categoriesTreeCtrl的,这意味着,你不能说categoriesTreeCtrl从你的模板.看看ng-change价值.