AngularJS ng-show 不工作？

Question

我正在尝试根据是否存在令牌来更改我的 UI (ON LOAD)。我想根据令牌是否存在来显示和隐藏我的登录 div 和我的表单 div。无论出于何种原因，我都无法让 ng-show 工作。为了简化问题，我有以下内容：

HTML

<div ng-app="nh-launch">
    <div ng-show="loginView">
        <h1>Login</h1>
    </div>

    <div ng-show="formView">
        <h1>Form</h1>
    </div>
</div>

JS

angular.module('nh-launch',[]).run(function($scope) {

var token = "valid";

    if (token == "valid") {
        $scope.loginView = false;
        $scope.formView = true;
        $scope.$apply();
    }
    else {
        $scope.loginView = true;
        $scope.formView = false;
        $scope.$apply();
    }

});

Answer 1

将运行控制器更改为：

angular.module('nh-launch', []).controller('launch-controller', function($scope) {
    /* This run when page load... */
    $scope.loginView = false;
    $scope.formView = true;
    
    $scope.changeView = function() {
        /* This run when click button */
        $scope.token = ($scope.token == "valid" ? "" : "valid");
        $scope.loginView = $scope.token == "valid";
        $scope.formView = $scope.token != "valid";
    };
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="nh-launch" ng-controller="launch-controller">
  <button type="button" ng-click="changeView();">Change</button>
  <div ng-show="loginView">
    <h1>Login</h1>
  </div>

  <div ng-show="formView">
    <h1>Form</h1>
  </div>
</div>

Answer 2

在像 AngularJS 这样的 MVC 框架中，模型（$scope）与视图相关联。连接两者的粘合剂是控制器。这就是为什么 $scope 变量应该在控制器中声明。我会按如下方式重组您的代码

angular.module('nh-launch',[])
   .controller('myCtrl', ['$scope', function($scope) {

        var token = "valid";

        if (token == "valid") {
            $scope.loginView = false;
            $scope.formView = true;
            $scope.$apply();
        }
        else {
            $scope.loginView = true;
            $scope.formView = false;
            $scope.$apply();
        }

    }]);

然后使用 ng-controller 属性创建对控制器的引用。您的 HTML 应该如下所示

<div ng-app="nh-launch">
  <div ng-controller="myCtrl">
    <div ng-show="loginView">
        <h1>Login</h1>
    </div>

    <div ng-show="formView">
        <h1>Form</h1>
    </div>
  </div>
</div>

Answer 3

必须有一个与视图绑定的控制器。所以下面的代码将帮助你得到：

  <div ng-app="nh-launch">
    <div ng-controller="LoginCtrl">
        <div ng-show="loginView">
            <h1>Login</h1>
        </div>

        <div ng-show="formView">
            <h1>Form</h1>
        </div>
    </div>
    </div>
<script>
    angular.module('nh-launch',[]).controller('LoginCtrl',function($scope) {

        var token = "valid";

        if (token == "valid") {
            $scope.loginView = false;
            $scope.formView = true;
            $scope.$apply();
        }
        else {
            $scope.loginView = true;
            $scope.formView = false;
            $scope.$apply();
        }

    });
</script>

Answer 4

您不需要单独的控制器（尽管您应该在实际程序中使用控制器和范围）。

您可以注入 $rootscope. $scope.$apply 不需要。

我已经调整了你的代码 https://jsfiddle.net/m1q7h9fn/8/

AngularJS ng-show 不工作？

AngularJS ng-show Not Working?

javascript

html

angularjs

ng-show