Question

我想访问父指令的范围，但我似乎无法获得正确的设置组合。这是可能的，这是正确的方法吗？

我真的想避免在MyCtrl中放置像SOME_CONST（这可以帮助我通过控制流程进行DOM更新）之类的内容

<div ng-controller="MyCtrl">
    <parent>
        <child></child>
    </parent>
</div>

var myApp = angular.module('myApp',[]);

function MyCtrl($scope) {
    $scope.obj = {prop:'foo'};
}

myApp.directive('parent', function() {
    return {
        scope: true,
        transclude: true,
        restrict: 'EA',
        template: '<div ng-transclude><h1>I\'m parent {{obj.prop}}<h1></div>',
        link: function(scope, elem, attrs) {
            scope.SOME_CONST = 'someConst';
        }
    }
});

myApp.directive('child', function() {
    return {
        restrict: 'EA',
        template: '<h1>I\'m child.... I want to access my parent\'s stuff, but I can\'t.  I can access MyCtrlScope though, see <b>{{obj.prop}}</b></h1> how can I access the <b>SOME_CONST</b> value in my parent\'s link function?  is this even a good idea? {{SOME_CONST}}.  I really don\'t want to put everything inside the MyCtrl',
    }
});

请参阅此fiddle

由于

Answer 1

使用transclude: true和scope: true，parent指令会创建两个新范围： enter image description here

范围004是scope: true的结果，范围005是transclude: true的结果。由于child指令不创建新范围，因此它使用了被转换的范围005.从图中可以看出，没有从范围005到范围004的路径（除了通过私有属性$$ prevSibling，它进入与$$ nextSibling相反的方向 - 但不要使用它们。）

@ joakimbl的解决方案在这里可能是最好的，虽然我认为在父指令的控制器上定义API更常见，而不是在this上定义属性：

controller: function($scope) {
    $scope.SOME_CONST = 'someConst';
    this.getConst = function() {
       return $scope.SOME_CONST;
    }
}

然后在child指令中：

link:function(scope,element,attrs,parentCtrl){
    scope.SOME_CONST = parentCtrl.getConst();
},

这是tabs和pane指令在Angular主页上的工作方式（“创建组件”示例）。

Answer 2

通常，您在指令中访问父作用域变量的方式是通过指令配置中的双向绑定（scope:{model:'=model'} - 请参阅the angular guide on directives），但由于您使用的是transclusion，这是不那么直截了当。如果child指令始终是父指令的子指令，则可以将其配置为需要父指令，然后在子链接函数中访问父控制器：

myApp.directive('parent', function() {
  return {
    scope: true,
    transclude: true,
    restrict: 'EA',
    template: '<div ng-transclude><h1>I\'m parent {{obj.prop}}<h1></div>',
    controller: function($scope) {
        $scope.SOME_CONST = 'someConst';
        this.SOME_CONST = $scope.SOME_CONST;
    }
  }
});

myApp.directive('child', function() {
  return {
    restrict: 'EA',
    require:'^parent',
    scope:true,
    link:function(scope,element,attrs,parentCtrl){
        scope.SOME_CONST = parentCtrl.SOME_CONST;
    },
    template: '<h1>I\'m child.... I want to access my parent\'s stuff, but I can\'t.  I can access MyCtrlScope though, see <b>{{obj.prop}}</b></h1> how can I access the <b>SOME_CONST</b> value in my parent\'s link function?  is this even a good idea? {{SOME_CONST}}.  I really don\'t want to put everything inside the MyCtrl',
  }
});

请参阅此更新：http://jsfiddle.net/uN2uv/

Answer 3

我遇到了同样的问题，最后用角度手册解决了;）

简而言之：您需要在父指令中使用控制器，要求 > 中的控制器 子指令。这样您就可以获得父属性。

参见https://docs.angularjs.org/guide/directive 章：创建沟通指令

我改变你的小提琴使用控制器，现在你可以访问你的常量： https://jsfiddle.net/bbrqdmt3/1/

var myApp = angular.module('myApp',[]); function MyCtrl($scope) { $scope.obj = {prop:'foo'}; } myApp.directive('parent', function() { return { scope: true, transclude: true, restrict: 'EA', template: '<div ng-transclude><h1>I\'m parent {{obj.prop}}<h1></div>', controller: function($scope) { this.getConst= function() { return 'someConst'; } }, } }); myApp.directive('child', function() { return { restrict: 'EA', require : '^parent', link: function(scope, element, attrs, ctrl) { scope.value= ctrl.getConst(); }, template: '<h1>I\'m child.... I want to access my parent\'s stuff, but I can\'t. I can access MyCtrlScope though, see <b>{{obj.prop}}</b></h1> how can I access the <b>SOME_CONST</b> value in my parent\'s link function? is this even a good idea? {{value}}. I really don\'t want to put everything inside the MyCtrl', } });

Answer 4

在控制器之后的链接fn的参数中有一个转换fn。

myApp.directive('parent', function() {
  return {
    scope: true,
    transclude: true,
    restrict: 'EA',
    template: '<div><h1>I'm a parent header.</h1></div>',
    link: function (scope, el, attrs, ctrl, transclude) {

        transclude(scope, function (clone, scope) {
            element.append(clone); // <-- will transclude it's own scope
        });

    },
    controller: function($scope) {
        $scope.parent = {
            binding: 'I\'m a parent binding'
        };
    }
  }
});

myApp.directive('child', function() {
  return {
    restrict: 'EA',
    require:'^parent',
    scope:true,
    link:function(scope,element,attrs,parentCtrl){

    },
    template: '<div>{{parent.binding}}</div>' // <-- has access to parent's scope
  }
});

在Transcluded Directive中访问父范围

4 个答案: