如何基于布尔值在AngularJS中切换ng-show？

我有一个表单，用于答复仅在isReplyFormOpen为true 时才要显示的消息，并且每次单击答复按钮时，我都希望切换是否显示该表单。我怎样才能做到这一点？

您只需要在ng-click事件上切换“ isReplyFormOpen”的值

<a ng-click="isReplyFormOpen = !isReplyFormOpen">Reply</a>
 <div ng-show="isReplyFormOpen" id="replyForm">
   </div>

基本上我解决了它的不 -ing的isReplyFormOpen时，它被点击价值：

<a ng-click="isReplyFormOpen = !isReplyFormOpen">Reply</a>

<div ng-init="isReplyFormOpen = false" ng-show="isReplyFormOpen" id="replyForm">
    <!-- Form -->
</div>

如果基于单击，则为：

ng-click="orderReverse = orderReverse ? false : true"

值得注意的是，如果在Controller A中有一个按钮，而要在Controller B中显示的元素，则可能需要使用点表示法来跨控制器访问范围变量。

例如，这将无法正常工作：

<div ng-controller="ControllerA">
  <a ng-click="isReplyFormOpen = !isReplyFormOpen">Reply</a>

  <div ng-controller="ControllerB">
    <div ng-show="isReplyFormOpen" id="replyForm">
    </div>
  </div>

</div>

要解决此问题，请创建一个全局变量（即在Controller A或您的主Controller中）：

.controller('ControllerA', function ($scope) {
  $scope.global = {};
}

然后在您的click和show变量中添加“ global”前缀：

<div ng-controller="ControllerA">
  <a ng-click="global.isReplyFormOpen = !global.isReplyFormOpen">Reply</a>

  <div ng-controller="ControllerB">
    <div ng-show="global.isReplyFormOpen" id="replyForm">
    </div>
  </div>

</div>

有关更多详细信息，请查看Angular-UI文档中的嵌套状态和嵌套视图，观看视频或阅读理解范围。

这是使用ngclick＆ng-if指令的示例。

注意：ng-if从DOM中删除了元素，但是ng-hide仅隐藏了元素的显示。

<!-- <input type="checkbox" ng-model="hideShow" ng-init="hideShow = false"></input> -->

<input type = "button" value = "Add Book"ng-click="hideShow=(hideShow ? false : true)"> </input>
     <div ng-app = "mainApp" ng-controller = "bookController" ng-if="hideShow">
             Enter book name: <input type = "text" ng-model = "book.name"><br>
             Enter book category: <input type = "text" ng-model = "book.category"><br>
             Enter book price: <input type = "text" ng-model = "book.price"><br>
             Enter book author: <input type = "text" ng-model = "book.author"><br>


             You are entering book: {{book.bookDetails()}}
     </div>

    <script>
             var mainApp = angular.module("mainApp", []);

             mainApp.controller('bookController', function($scope) {
                $scope.book = {
                   name: "",
                   category: "",
                   price:"",
                   author: "",


                   bookDetails: function() {
                      var bookObject;
                      bookObject = $scope.book;
                      return "Book name: " + bookObject.name +  '\n' + "Book category: " + bookObject.category + "  \n" + "Book price: " + bookObject.price + "  \n" + "Book Author: " + bookObject.author;
                   }

                };
             });
    </script>

如果您有多个带有子菜单的菜单，则可以采用以下解决方案。

的HTML

          <ul class="sidebar-menu" id="nav-accordion">
             <li class="sub-menu">
                  <a href="" ng-click="hasSubMenu('dashboard')">
                      <i class="fa fa-book"></i>
                      <span>Dashboard</span>
                      <i class="fa fa-angle-right pull-right"></i>
                  </a>
                  <ul class="sub" ng-show="showDash">
                      <li><a ng-class="{ active: isActive('/dashboard/loan')}" href="#/dashboard/loan">Loan</a></li>
                      <li><a ng-class="{ active: isActive('/dashboard/recovery')}" href="#/dashboard/recovery">Recovery</a></li>
                  </ul>
              </li>
              <li class="sub-menu">
                  <a href="" ng-click="hasSubMenu('customerCare')">
                      <i class="fa fa-book"></i>
                      <span>Customer Care</span>
                      <i class="fa fa-angle-right pull-right"></i>
                  </a>
                  <ul class="sub" ng-show="showCC">
                      <li><a ng-class="{ active: isActive('/customerCare/eligibility')}" href="#/CC/eligibility">Eligibility</a></li>
                      <li><a ng-class="{ active: isActive('/customerCare/transaction')}" href="#/CC/transaction">Transaction</a></li>
                  </ul>
              </li>
          </ul>

我首先调用了两个函数，即ng-click = hasSubMenu（'dashboard'）。此功能将用于切换菜单，下面的代码对此进行了说明。ng-class =“ {active：isActive（'/ customerCare / transaction'）}它将为当前菜单项添加一个活动类。

现在，我在我的应用程序中定义了一些功能：

首先，添加一个依赖项$ rootScope，用于声明变量和函数。要了解有关$ roootScope的更多信息，请参考链接：https ://docs.angularjs.org/api/ng/service/ $ rootScope

这是我的应用程序文件：

 $rootScope.isActive = function (viewLocation) { 
                return viewLocation === $location.path();
        };

上面的函数用于将活动类添加到当前菜单项。

        $rootScope.showDash = false;
        $rootScope.showCC = false;

        var location = $location.url().split('/');

        if(location[1] == 'customerCare'){
            $rootScope.showCC = true;
        }
        else if(location[1]=='dashboard'){
            $rootScope.showDash = true;
        }

        $rootScope.hasSubMenu = function(menuType){
            if(menuType=='dashboard'){
                $rootScope.showCC = false;
                $rootScope.showDash = $rootScope.showDash === false ? true: false;
            }
            else if(menuType=='customerCare'){
                $rootScope.showDash = false;
                $rootScope.showCC = $rootScope.showCC === false ? true: false;
            }
        }

默认情况下，$ rootScope.showDash和$ rootScope.showCC设置为false。最初加载页面时，它将菜单关闭。如果您有两个以上子菜单，请相应地添加。

hasSubMenu（）函数将在菜单之间切换。我增加了一个小条件

if(location[1] == 'customerCare'){
                $rootScope.showCC = true;
            }
            else if(location[1]=='dashboard'){
                $rootScope.showDash = true;
            }

根据所选菜单项重新加载页面后，子菜单将保持打开状态。

我的页面定义如下：

$routeProvider
        .when('/dasboard/loan', {
            controller: 'LoanController',
            templateUrl: './views/loan/view.html',
            controllerAs: 'vm'
        })

仅当只有一个没有子菜单的菜单时，才可以使用isActive（）函数。您可以根据需要修改代码。希望这会有所帮助。祝你有美好的一天 ：）