javascript - Angularjs 自定义组件与 ngSwitch 指令编译顺序

Question

有以下代码片段:

<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组件 myHeader 。现在 component1 是在 myHeader 之前构建的。

路由代表以下代码:

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

Answer 1

您可以通过在 myHeader 指令内的链接函数中公开 Controller 来实现此目的。

这样，您就可以轻松地向 Controller 添加变量，并使用 ng-if 控制 ng-switch div 的可见性。检查此处的代码片段。

啊，别忘了加上ng-cloak到包含 ng-switch 指令的 div。

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>