Question

我有这段代码：

....
<article class="collapse navbar-collapse">
    <ul ng-if="isLogged()" class="nav navbar-nav">
        <li ng-class="{'active': activeUrl === 'projects'}">
            <a href="#/projects" ng-click="activeUrl='projects'">Projects</a>
        </li>
        <li ng-if="isAdmin()" ng-class="{'active': activeUrl === 'admin'}">
            <a href="#/admin" ng-click="activeUrl='admin'">Administration</a>
        </li>
    </ul>
</article>

单击链接时应添加active类。在我添加模拟用户身份验证的ng-if表达式之前，它一直运行良好。现在，当它添加active类一次时，它在单击另一个导航链接时不会删除此类 - 它看起来像是同时打开了2个页面。 applicationController有模拟函数：

applicationController= function($scope, Restangular, userService){
    $scope.activeUrl = "admin";
    $scope.data = {
        user: {
        email: undefined,
        password: undefined
        }
    };

    $scope.login = function(user){
        //login mock
    };

    $scope.isLogged = function(){
        return userService.isLogged();
    };

     $scope.isAdmin = function(){
        return userService.isAdmin();
    };
};

并且userService具有确定用户是否经过身份验证以及是否为管理员的逻辑。我不认为ng-if在一个HTML元素中ng-class是不寻常的，这就是为什么我认为我必须犯一些我无法看到的简单错误。是否在任何点击后重新创建范围？如果有人帮助我，我会很高兴 - 提前谢谢你！更新：@ptwo帮助的解决方案，我需要$parent和管理$parent.$parent：

<article class="collapse navbar-collapse">
    <ul ng-if="isLogged()" class="nav navbar-nav">
        <li ng-class="{'active': $parent.activeUrl === 'projects'}">
           <a href="#/projects" ng-click="$parent.activeUrl='projects'">Projects</a>
        </li>
        <li ng-if="isAdmin()" ng-class="{'active': $parent.$parent.activeUrl === 'admin'}">
           <a href="#/admin" ng-click="$parent.$parent.activeUrl='admin'">Administration</a>
        </li>
      </ul>
</article>

使用解决方案

更新2 而不直接访问$parent，但data中的applicationController对象允许我访问activeUrl：

<article class="collapse navbar-collapse">
    <ul ng-if="isLogged()" class="nav navbar-nav">
        <li ng-class="{'active': data.activeUrl === 'projects'}">
            <a href="#/projects" ng-click="data.activeUrl='projects'">Projects</a>
        </li>
        <li ng-if="isAdmin()" ng-class="{'active': data.activeUrl === 'admin'}">
            <a href="#/admin" ng-click="data.activeUrl='admin'">Administration</a>
        </li>
    </ul>
</article>

applicationController= function($scope, Restangular, userService){
    $scope.data = {
        activeUrl: "admin",
        user: {
            email: undefined,
            password: undefined
        }
};
....

Answer 1

使用函数更改activeUrl。在视图中包含表达式绝不是一种好习惯。

<article class="collapse navbar-collapse">
<ul ng-if="isLogged()" class="nav navbar-nav">
    <li ng-class="{'active': isActiveUrl('projects')}">
        <a href="#/projects" ng-click="updateActiveUrl('projects')">Projects</a>
    </li>
    <li ng-if="isAdmin()" ng-class="{'active': isActiveUrl('admin')}">
        <a href="#/admin" ng-click="updateActiveUrl('admin')">Administration</a>
    </li>
</ul>
</article>

applicationController= function($scope, Restangular, userService){
    $scope.data = {
        activeUrl: "admin",
        user: {
            email: undefined,
            password: undefined
        } };
    $scope.isActiveUrl = isActiveUrl;
    $scope.updateActiveUrl = updateActiveUrl;

    function isActiveUrl(param){
      return $scope.data.activeUrl == param;
    }

    function updateActiveUrl(param){
      $scope.data.activeUrl = param;
    }
}

我们的想法是将父范围的成员变量从其自己的范围更改，而不是ng-if的子范围。

Answer 2

使用ng时 - 如果它添加了自己的范围，因此在单击时，将在控制器的子范围上设置activeUrl。尝试使用$parent.activeUrl='admin'它应该可以使用

使用ng-if时ng-class的奇怪行为

2 个答案: