javascript - 指令隔离范围不能与嵌套 View 一起正常工作？ (AngularJS/UI 路由器)

Question

我在 AngularJS 项目中使用 ui-router，我有一个包含自定义指令的嵌套 View 。 该指令呈现一个输入字段(可以说是一个过滤器字段)，它的值应该与 Controller 的范围同步。

---

当 View /状态不是嵌套时，这对这个指令很有效:

jsFiddle / not nested / working as expected

var myApp = angular.module('myApp', ['ui.router', 'myComponents'])
    .config(['$stateProvider', function ($stateProvider) {
        $stateProvider.
            state('home', {
                url: '',
                template: '<my-filter text-filter="theFilter"></my-filter><button ng-click="inspect()">inspect</button>{{ theFilter |json}}',
                controller: 'myController'
            });
    }]);

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

components.directive('myFilter', [function () {
    return {
        restrict: 'E',
        template: '<input type="text" name="filter" ng-model="textFilter">',
        scope: {
            textFilter: '='
        }
    };
}]);

components.controller('myController', ['$scope', function ($scope) {
    $scope.theFilter = 'initial filter';

    $scope.inspect = function () {
        alert($scope.theFilter);
    }
}]);

查看:

<div ng-app="myApp">
    <div ui-View></div>
</div>

当我更改输入字段的文本时，它会反射(reflect)在范围上...

---

...但是当我嵌套 View /状态时，作用域上的值保持其初始值，但我希望它在覆盖时根据输入字段的值进行更改。

var myApp = angular.module('myApp', ['ui.router', 'myComponents'])
    .config(['$stateProvider', function ($stateProvider) {
        $stateProvider.
            state('home', {
                abstract: true,
                url: '',
                template: 'Nested View:<div ui-view></div>',
                controller: 'myController'
            }).
            state('home.detail', {
                url: '',
                template: '<my-filter text-filter="theFilter"></my-filter><button ng-click="inspect()">inspect</button>{{ theFilter |json}}'
            });;
    }]);


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

components.directive('myFilter', [function () {
    return {
        restrict: 'E',
        template: '<input type="text" name="filter" ng-model="textFilter">',
        scope: {
            textFilter: '='
        }
    };
}]);

components.controller('myController', ['$scope', function ($scope) {
    $scope.theFilter = 'initial filter';

    $scope.inspect = function () {
        alert($scope.theFilter);
    }
}]);

查看:

<div ng-app="myApp" >
    <div ui-View></div>
</div>

这里，作用域上的文本(参见 Controller )保持不变。

知道如何使用嵌套 View 获得与第一个示例相同的结果吗？

PS:指令需要保持可重用

jsFiddle / nested / not working as expected

Answer 1

这与一个常见问题有关。如本视频中所述 angular JS - best practice (29:19)，并在此处解释:Nested Scopes in Angular JS

"Whenever you have ng-model there's gotta be a dot in there somewhere. If you don't have a dot, you're doing it wrong."

所以 Controller 应该创建一个对象:

components.controller('myController', ['$scope', function($scope) {

    // here theFilter is an object
    // with property value
    $scope.theFilter =  { value : 'initial filter'};

    $scope.inspect = function() {
        alert($scope.theFilter.value);
    }    
}]);

并且模板应该与具有属性 value 的对象一起工作:

components.directive('myFilter', [function() {
    return {
        restrict: 'E',
        template: '<input type="text" name="filter" ng-model="textFilter.value">',
        scope: {
            textFilter: '='             
        }
    };          
}]);

更新的jsfiddle