Question

有以下代码段：

<my-header></my-header>
<div ng-switch="$ctrl.page">
        <div ng-switch-when="1"><component1></component1></div>
        <div ng-switch-when="2"><component2></component2></div>
        <div ng-switch-when="3"><component3></component3></div>
</div>

我希望在 ngSwitch 指令执行操作之前构建 myHeader 组件。现在 component1 是在 myHeader 之前构建的。

路由表示以下代码：

$stateProvider
  .state({
    name: 'myApp',
    url: '/',
    component: 'loader',
  })
  .state({
    name: 'myApp.pages',
    url: 'pages/{id:int}',
    component: 'loader'
  });
$urlRouterProvider.otherwise('/pages/1');

Answer 1

您可以通过将控制器暴露在 myHeader 指令内的链接功能中来实现此目的。

通过这种方式，您可以轻松地将变量添加到控制器并使用 ng-if 控制ng-switch div的可见性。请在此处查看代码段。

啊，别忘了将ng-cloak添加到包含 ng-switch 指令的div中。

angular
        .module('app', [])
        .controller('TestController', function($scope) {
            this.page = 1;
        })
        .directive('myHeader', function () {
            return {
                link: function (scope, element, attrs) {
                    // With element.controller() we can reach the controller that is wrapping our directive. Then, we can simply set the headerIsLoaded variable to true.
                    element.controller().headerIsLoaded = true;
                },
                scope: true,
                templateUrl: 'my-header.html'
            }
        });

<div ng-controller="TestController as ctrl">

    <my-header></my-header>

    <!-- Add a visual feedback so user knows the components are being loaded -->
    <div ng-if="!ctrl.headerIsLoaded">
        Loading...
    </div>

    <!-- If ctrl.headerIsLoaded is set to true, the ng-switch will appear -->
    <div ng-if="ctrl.headerIsLoaded"
         ng-cloak>
        <div ng-switch="ctrl.page">
            <div ng-switch-when="1">
                Page 1
            </div>
            <div ng-switch-when="2">
                Page 2
            </div>
            <div ng-switch-when="3">
                Page 3
            </div>
        </div>
    </div>

</div>

Angularjs自定义组件与ngSwitch指令编译顺序

1 个答案: