AngularJS指令,ControllerAs,范围和VM财产 [英] AngularJS directive, ControllerAs, scope and vm property

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问题描述

采用了棱角分明我创造了这样的指令:

 
    .module(我的模块,[])
    .directive('myDirective',函数(){        返回{
            限制:'E',
            templateUrl:('JS','的.html')currentScriptPath.replace,
            范围: {
                场景:'='
            },
            控制器:MyDirectiveController,
            controllerAs:虚拟机,
            bindToController:真实,
            替换:真
        }    });

MyDirectiveController

  MyDirectiveController $注射='$范围'];功能MyDirectiveController($范围){
    VAR VM =这一点;
    vm.scenarios = $ scope.scenarios;
}

我的指令HTML模板是这样的:

 < D​​IV> {{vm.scenarios [0]。名称}}< / DIV>

在我父视图HTML我使用的指令是这样的:

 <我的指导性方案=vm.scenarios>< /我-指令>

父控制器有一个属性:

  vm.scenarios = [] //可能是[{名称:测试}]

由于 vm.scenarios 父控制器得到一个$ HTTP调用它不可设置后,当 vm.scenarios 指令控制器绑定到 $ scope.scenarios 并没有更新的时候,父母控制 vm.scenarios 最终得到填充。

在此添加到我的指令的控制器,它的工作原理,但解决方案似乎我错了:

  $范围。$腕表('方案',函数(newValue)以{
    如果(为newValue!==未定义){
            vm.scenarios = $ scope.scenarios;
    }
});


解决方案

这是你应该如何定义你的指令的控制器:

  MyDirectiveController $注射= [];功能MyDirectiveController(){
    // 这里没有什么
}

您不需要使用 $范围,因为你已经绑定到控制器实例这个。这意味着,范围配置

 范围:{
    场景:'='
},

填充控制器实例这个对象,而不是 $范围对象,因此 $范围.scenarios 未定义。随着 vm.scenarios = $ scope.scenarios; 控制器中你只是简单地覆盖正确的未定义值绑定。

演示: http://plnkr.co/编辑/ lYg15Xpb3CsbQGIb37ya?p = preVIEW

Using Angular I created a directive like this:

angular
    .module('my-module', [])
    .directive('myDirective', function () {

        return {
            restrict: 'E',
            templateUrl: currentScriptPath.replace('.js', '.html'),
            scope: {
                scenarios: '='
            },
            controller: MyDirectiveController,
            controllerAs: 'vm',
            bindToController: true,
            replace: true
        }

    });

MyDirectiveController:

MyDirectiveController.$inject = ['$scope'];

function MyDirectiveController($scope) {
    var vm = this;
    vm.scenarios = $scope.scenarios;
}

My directive HTML template is this:

<div>{{vm.scenarios[0].name}}</div>

In my parent view HTML I'm using the directive this way:

<my-directive scenarios="vm.scenarios"></my-directive>

The parent controller has a property:

vm.scenarios = [] // could be [{ name : "test"}]

As the vm.scenarios of the parent controller gets set after an $http call it is not available when the vm.scenarios of the directive controller is bound to the $scope.scenarios and it doesn't get updated when the parents controller vm.scenarios gets populated eventually.

When adding this to my directives controller, it works but the solution seems wrong to me:

$scope.$watch('scenarios', function(newValue) {
    if (newValue !== undefined) {
            vm.scenarios = $scope.scenarios;
    }
});

解决方案

This is how you should define your directive controller:

MyDirectiveController.$inject = [];

function MyDirectiveController() {
    // nothing here
}

You don't need to use $scope because you already bind to controller instance this. It means that scope config

scope: {
    scenarios: '='
},

populates controller instance this object, not $scope object, and hence $scope.scenarios is undefined. With vm.scenarios = $scope.scenarios; in controller you just overwrite correct binding with undefined value.

Demo: http://plnkr.co/edit/lYg15Xpb3CsbQGIb37ya?p=preview

这篇关于AngularJS指令,ControllerAs,范围和VM财产的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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