一尘不染

如何在AngularJs的指令中修改范围

angularjs

我需要从指令内的回调中修改根范围属性。但是,该指令位于由switch指令创建的内部范围内。

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

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“选定区域”中显示“新值”。我该如何完成我想做的事情?我究竟做错了什么?

此外,我正在尝试制作一个组件。有没有办法做到这一点,但要隔离范围?


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2020-07-04

共1个答案

一尘不染

我更新了小提琴,基本上不得不去父级来获取正确的“选定”变量,还使用了isolate scope =来获得传入的值和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';
}

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jsfiddle以使用属性中的原始读取属性:http ://jsfiddle.net/nJ7FQ/4/

2020-07-04