你可以使用与Angular的NG-CLASS活动链接的变量吗？

Question

I want to use a loop to create my navigation Here is my code I keep getting an error saying it won't evaluate as a string? 我想使用循环来创建我的导航这是我的代码我一直收到一个错误，说它不会评估为字符串？ The code that I wrote is so that it will loop through the $scope.navigation and use that to write out the navigation so I don't have to write out each list and anchor tag? 我写的代码是这样的，它将遍历$ scope.navigation并使用它来写出导航，所以我不必写出每个列表和锚标记？

  <!DOCTYPE html>
  <html ng-app="Sample">
    <head>
       <title>Sample Angular App</title>
       <script src="Scripts/basket.js"></script>
       <link rel="stylesheet" href="css/global.css"/>
       <script src="Scripts/angular.min.js"></script>
       <script src="controllers/main.js"></script>
       <script src="routes/route.js"></script>
  </head>
   <body>
     <div class="navigation" ng-controller="AppCtrl">
         <ul class="cf" >
            <li class="link {{link.name}}" ng-class="{{link.name + 'Active'}}" ng-repeat="link in navigation">
              <a href="{{link.route}}" ng-click="setActive($index)">{{link.name |      uppercase}}</a> 
            </li>
        </ul>
     </div>
     <div class="wrapper">
       <div ng-view>

       </div>
     </div>
   </body>
  </html>

My main js script file looks like this: 我的主要js脚本文件如下所示：

          function AppCtrl($scope) {

            $scope.navigation = [

                { name:"main", route:"#/"},
                { name:"edit", route:"#/edit" },
                { name: "save", route: "#/save" },
                { name: "settings", route: "#/settings" }

            ];

            $scope.currentPage = null;

            $scope.setCurrentPage = function (index) {

                $scope.currentPage = $scope.navigation[index];

            }

            $scope.setActive = function (index) {

                angular.forEach($scope.navigation, function (value, key) {

                   $scope[value.name + 'Active'] = "";

                });

             var active = $scope.navigation[index].name;

                $scope[active + 'Active'] = "active";


            }

        }

It keeps giving me an error saying that the {{link.name}} cannot be evaluated as a string but it is a string? 它一直给我一个错误，说{{link.name}}不能被评估为字符串，但它是一个字符串？ Is there a way to loop through a $scope.navigation and get it to output the navigation without having to manually write it out and still add the setActive function? 有没有办法循环$ scope.navigation并让它输出导航而不必手动写出来仍然添加setActive函数？ I am kind of new at working with angularjs. 我对使用angularjs有点新意。 Is there a way to fix this issue or is it that doing things this way is not allowed in angular? 有没有办法解决这个问题，还是以角度方式不允许这样做？

Answer 1

There's a much better/easier way to accomplish setting a active CSS class. 有一种更好/更简单的方法来完成设置active CSS类。 Just save a single value in your scope that holds the value of what is active. 只需在范围中保存一个值，该值保存活动的值。 Something like this: 像这样的东西：

$scope.setActive = function (index) {    
  $scope.activeIndex = index;
};

Then ng-class allows you to give it an map where "the names of the properties whose values are truthy will be added as css classes to the element" (From http://docs.angularjs.org/api/ng.directive:ngClass ). 然后ng-class允许你给它一个映射，其中“值为trtrhy的属性的名称将作为css类添加到元素中”（来自http://docs.angularjs.org/api/ng.directive： ngClass ）。

So you can set the CSS class if the $index is the activeIndex : 因此，如果$index是activeIndex您可以设置CSS类：

ng-class="{active: $index == activeIndex}"

Answer 2

I've tested the dnc253's solution. 我测试了dnc253的解决方案。 But it doesn't seems worked anymore. 但它似乎不再有用了。

I had to create a method like this: 我必须创建一个这样的方法：

$scope.isActive = function(index){
    return $scope.activeIndex === index;
};

And in html : 并在HTML中：

ng-class="{active: isActive($index)}"

This works fine. 这很好用。

你可以使用与Angular的NG-CLASS活动链接的变量吗？

问题描述

2 个解决方案

解决方案1
7 已采纳 2013-09-11 15:27:25

解决方案2
2 2015-07-20 10:10:33

你可以使用与Angular的NG-CLASS活动链接的变量吗？

问题描述

2 个解决方案

解决方案1 7 已采纳 2013-09-11 15:27:25

解决方案2 2 2015-07-20 10:10:33

解决方案1
7 已采纳 2013-09-11 15:27:25

解决方案2
2 2015-07-20 10:10:33