如何在AngularJs中的指令内修改范围

Question

我需要在指令内的回调中修改根范围属性.但该指令位于由switch指令创建的内部作用域中.

HTML

<div ng-app="app" ng-controller='AppController'>
    <p>Selected: {{ selected }}</p>
    <div ng-switch on="selected">
        <div ng-switch-default>
            <p>Item: {{ selected }}</p>
            <custom-tag selected-item="selected" />
        </div>
        <div ng-switch-when="New value">
            <p>Worked</p>
        </div>
    </div>
</div>

JavaScript的

angular.module('app', [])    
    .directive("customTag", [function () {
    return {
        restrict: "E",
        replace: true,
        template: "<input type='button' value='Click me' />",

        link: function (scope, element, attrs) {
            element.bind('click', function () {
                scope[attrs.selectedItem] = "New value";
                scope.$apply();
            });
        }
    };
}]);

function AppController($scope) {
    $scope.selected = 'Old value';
}

小提琴:http://jsfiddle.net/nJ7FQ/

我的目标是能够在Selected区域中显示"New value".我怎样才能完成我想做的事情？我究竟做错了什么？

此外,因为我正在尝试制作一个组件.有没有办法做同样但具有孤立的范围？

Answer 1

我更新了小提琴,基本上不得不去父母那里获得正确的"选定"变量,还使用了isolate scope =来获取传入的值与内部模型之间的双向绑定.

http://jsfiddle.net/nJ7FQ/2/

angular.module('app', [])

    .directive("customTag", [function () {
    return {
        restrict: "E",
        replace: true,
        template: "<input type='button' value='Click me' />",
        scope: {model:'='},

        link: function (scope, element, attrs) {
            element.bind('click', function () {
                scope.model[attrs.selectedItem] = "New value";
                scope.$apply();
            });
        }
    };
}]);

function AppController($scope) {
    $scope.selected = 'Old value';
}

和HTML

<div ng-app="app" ng-controller='AppController'>
    <p>Selected: {{ selected }}</p>
    <div ng-switch on="selected">
        <div ng-switch-default>
            <p>Item: {{ selected }}</p>
            <custom-tag selected-item="selected" model="$parent" />
        </div>
        <div ng-switch-when="New value">
            <p>Worked</p>
        </div>
    </div>
</div>

更新了小提琴,使用属性中您对该属性的原始读取:http: //jsfiddle.net/nJ7FQ/4/

Answer 2

我改进了jsfiddle:

angular.module('app', [])

    .directive("customTag", ['$parse', function ($parse) {
    return {
        restrict: "E",
        replace: true,
        template: "<input type='button' value='Click me' />",

        link: function (scope, element, attrs) {
            element.bind('click', function () {
                scope.$apply(function () {
                    $parse(attrs.selectedItem).assign(scope.$parent, "New value");
                });
            });
        }
    };
}]);

function AppController($scope) {
    $scope.selected = { 'foo': 'Old value' };
}

http://jsfiddle.net/nJ7FQ/15/

这样,您想要更改的范围值也可以是selected.foo示例中的对象属性.此外,我删除了scope参数并告诉指令始终使用父作用域.最后,我将click处理程序包装到$apply回调中(例如,请参见此处).当然,更好的是使用ngClick而不是element.bind().