根据 angularJS 中的条件显示 link

Question

我正在 AngularJS 中创建导航栏。我在 'div.menu-links'.

上分别在 mouseover 和 mouseleave 上显示和隐藏子菜单 'div.farm-links'

现在，在我的子菜单中，每当 'child.thirdLevelChildList.length' 大于 5 时，它应该将第 5 个 link 显示为 'View all' 并隐藏所有剩余的 link。否则，它应该显示所有 links.

例如，鼠标悬停在 'about abc' 下，在 'Company' 下，我应该只看到：'Strategy'、'Mission, Vision, Values'、'Leadership'、'Org chart' & 第 5 个 link 为 'view all'.

如何实现？这是我的代码：

angular.module('topNavApp', ['ngAnimate']).controller('navCtrl', ['$scope', '$timeout', function($scope, $timeout){
  $scope.pageData = {  
    "allChildList":[  
      {  
         "pageExist":true,
         "pageTitle":"About Abc",
         "pagePath":"http://www.yahoo.com",
         "openNewTab":true,
         "hideInTabletNav":true,
         "hideInMobileNav":true,
         "secondLevelChildList":[  
            {  
               "pageExist":true,
               "pageTitle":"News",
               "pagePath":"/content/myloc/about-Abc/news.html",
               "openNewTab":false,
               "thirdLevelChildList":[  

               ],
               "multiple":true,
               "thirdLevelPageExist":true
            },
            {  
               "pageExist":true,
               "pageTitle":"Company",
               "pagePath":"/content/myloc/about-Abc/company.html",
               "openNewTab":false,
               "thirdLevelChildList":[  
                  {  
                     "pageExist":true,
                     "pageTitle":"Strategy",
                     "pagePath":"/content/myloc/about-Abc/company/strategy.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Mission Vision Values",
                     "pagePath":"/content/myloc/about-Abc/company/missionvisionvalues.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Leadership",
                     "pagePath":"/content/myloc/about-Abc/company/leadership.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Org Chart",
                     "pagePath":"http://mysite/pages/OrgChart.aspx",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Corporate Responsibility",
                     "pagePath":"http://myloc2/who/global-impact",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"History",
                     "pagePath":"https://usa.Abc.com/about-Abc/our_business/history-of-Abc.html",
                     "openNewTab":true
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Products",
                     "pagePath":"http://myloc2/who/products",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Investor Info",
                     "pagePath":"http://investor.Abc.com/",
                     "openNewTab":true
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"View All",
                     "pagePath":"/content/myloc/about-Abc/company/view-more.html",
                     "openNewTab":false
                  }
               ],
               "multiple":true,
               "thirdLevelPageExist":true
            },
            {  
               "pageExist":true,
               "pageTitle":"Community",
               "pagePath":"/content/myloc/about-Abc/community.html",
               "openNewTab":false,
               "thirdLevelChildList":[  
                  {  
                     "pageExist":true,
                     "pageTitle":"Diversity + Inclusion",
                     "pagePath":"/content/myloc/about-Abc/community/diversity-and-inclusion.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Giving Back",
                     "pagePath":"http://myloc2/working/giving-back/Pages/default.aspx",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Ideas Community",
                     "pagePath":"/content/myloc/about-Abc/initiatives/ideas.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Other Communities",
                     "pagePath":"http://myloc2/working/get-involved/Pages/default.aspx",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"View All",
                     "pagePath":"/content/myloc/about-Abc/community/view-all-community.html",
                     "openNewTab":false,
                     "hideInDesktopNav":true
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"myloc Transformation",
                     "pagePath":"/content/myloc/about-Abc/community/transformation.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Calendar",
                     "pagePath":"/content/myloc/about-Abc/community/Calendar.html",
                     "openNewTab":false
                  }
               ],
               "multiple":true,
               "thirdLevelPageExist":true
            },

         ],
         "columnClass":"0",
         "multiple":true,
         "secondLevelPageExist":true
      },
      {  
         "pageExist":true,
         "pageTitle":"Offices",
         "pagePath":"http://www.yahoo.com",
         "openNewTab":true,
         "hideInDesktopNav":true,
         "hideInTabletNav":true,
         "hideInMobileNav":true,
         "secondLevelChildList":[  
            {  
               "pageExist":true,
               "pageTitle":"Locations",
               "pagePath":"/content/myloc/offices/locations.html",
               "openNewTab":false,
               "thirdLevelChildList":[  
                  {  
                     "pageExist":true,
                     "pageTitle":"Ashburn",
                     "pagePath":"/content/myloc/offices/locations/ashburn.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Austin",
                     "pagePath":"/content/myloc/offices/locations/austin.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Bangalore",
                     "pagePath":"/content/myloc/offices/locations/bangalore.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Denver",
                     "pagePath":"/content/myloc/offices/locations/denver.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Dubai",
                     "pagePath":"/content/myloc/offices/locations/dubai.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Foster City",
                     "pagePath":"/content/myloc/offices/locations/foster-city.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"San Francisco",
                     "pagePath":"/content/myloc/offices/locations/san-francisco.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Miami",
                     "pagePath":"/content/myloc/offices/locations/miami.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Singapore - Singpost",
                     "pagePath":"/content/myloc/offices/locations/singapore-singpost.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Singapore - Robinson Road",
                     "pagePath":"/content/myloc/offices/locations/singapore-robinson-road.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"View All",
                     "pagePath":"http://myloc.trusted.Abc.com/content/myloc/offices/locations.html",
                     "openNewTab":true
                  }
               ],
               "multiple":true,
               "thirdLevelPageExist":true
            },
            {  
               "pageExist":true,
               "pageTitle":"Quick Links",
               "pagePath":"/content/myloc/offices/quick-links.html",
               "openNewTab":true,
               "hideInDesktopNav":true,
               "hideInMobileNav":true,
               "thirdLevelChildList":[  
                  {  
                     "pageExist":true,
                     "pageTitle":"Copy Centers",
                     "pagePath":"/content/myloc/offices/quick-links/copy-centers.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Floor Maps",
                     "pagePath":"/content/myloc/offices/quick-links/floor-maps.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"Food Services",
                     "pagePath":"/content/myloc/offices/quick-links/food-services.html",
                     "openNewTab":false
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"View All",
                     "pagePath":"/content/myloc/offices/quick-links/view-all.html",
                     "openNewTab":false
                  }
               ],
               "multiple":true,
               "thirdLevelPageExist":true
            },
            {  
               "pageExist":true,
               "pageTitle":"Facilities Help",
               "pagePath":"/content/myloc/offices/facilities-help.html",
               "openNewTab":false,
               "thirdLevelChildList":[  
                  {  
                     "pageExist":true,
                     "pageTitle":"Submit Request",
                     "pagePath":"http://servicerequest",
                     "openNewTab":true
                  },
                  {  
                     "pageExist":true,
                     "pageTitle":"View All",
                     "pagePath":"/content/myloc/offices/facilities-help/view-all-facilities-help.html",
                     "openNewTab":false,
                     "hideInDesktopNav":true
                  }
               ],
               "multiple":true,
               "thirdLevelPageExist":true
            },
            {  
               "pageExist":true,
               "pageTitle":"View All",
               "pagePath":"/content/myloc/offices/view-all-offices.html",
               "openNewTab":false,
               "hideInDesktopNav":true,
               "thirdLevelChildList":[  

               ],
               "thirdLevelPageExist":false
            }
         ],
         "columnClass":"3",
         "multiple":true,
         "secondLevelPageExist":true
      },
      {  
         "pageExist":true,
         "pageTitle":"Functions",
         "pagePath":"https://www.google.com",
         "openNewTab":true,
         "hideInDesktopNav":true,
         "hideInTabletNav":true,
         "hideInMobileNav":true,
         "secondLevelChildList":[  

         ],
         "columnClass":"1",
         "multiple":true,
         "secondLevelPageExist":true
      },
      {  
         "pageExist":true,
         "pageTitle":"My HR",
         "pagePath":"/content/myloc/my-hr.html",
         "openNewTab":false,
         "secondLevelChildList":[  

         ],
         "columnClass":"1",
         "multiple":true,
         "secondLevelPageExist":true
      },
      {  
         "pageExist":true,
         "pageTitle":"Tools",
         "pagePath":"/content/myloc/tools.html",
         "openNewTab":true,
         "secondLevelChildList":[  

         ],
         "columnClass":"1",
         "multiple":true,
         "secondLevelPageExist":true
      }
   ]
};
  $scope.showDiv = function(obj){
 $timeout(function(){
   obj.hovering = true;
 }, 500);
  
  };
  $scope.hideDiv = function(obj){
 $timeout(function(){
   obj.hovering = false;
  }, 500);
  };
}]);

.hiding-div{
 display: inline-block;
 padding: 10px;
 margin: 10px;
}

.menu-link{
 text-decoration: none;
}

.menu-link:hover{
 color: #AB09AF;
}

.farm-links{
 position: absolute;
 top: 50px;
 height: 400px;
 width: 700px;
 border: 1px solid lightgrey;
 padding: 5px;
 display: flex;
 word-wrap: flex;
 column-count: 4;
}


.groups-links{
 display: inline-block;
 margin-right: 60px;

}

.group-title{
 color: grey;
 text-decoration: none;
}

.group-links{
 list-style: none;
}

.second-link{
 margin-left: -40px;
}

.second-link > a{
 text-decoration: none;
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<nav ng-app="topNavApp" ng-controller="navCtrl" class="nav">
  <div class="nav-center">
 <!--<li ng-repeat="obj in pageData.allChildList" ng-model="parentNav" ng-mouseover="parentNav=true" ng-mouseleave="parentNav=false"> -->
 <div ng-repeat="obj in pageData.allChildList" class="hiding-div" ng-mouseover="showDiv(obj)" ng-mouseleave="hideDiv(obj)" > 
   <div>
  <a ng-href="{{obj.pagePath}}" class="main-link multiple menu-link">{{obj.pageTitle}}</a>
  <!--<span class="main-link mobile" aria-labelledby="{{obj.pageTitle}}" aria-expanded="false">{{obj.pageTitle}}</span>-->

  <!--<span ng-repeat="child in obj.secondLevelVoList" class="childNav" ng-show="parentNav">--> 
  <div class="farm-links" ng-show="obj.hovering">
    <!--<a class="prev-link" aria-labelledby="{{obj.pagetitle}}">{{obj.pageTitle}}</a>-->
    <div ng-repeat="child in obj.secondLevelChildList" class="groups-links">
   <a ng-href="{{child.pagePath}}" class="group-title">{{child.pageTitle}}</a>
   <!--<span class="group-title mobile" aria-expanded="false">{{child.pageTitle}}</span>-->
   <ul ng-repeat="subchild in child.thirdLevelChildList" class="group-links">
     <li class="second-link">
    <a ng-href="{{subchild.pagePath}}">{{subchild.pageTitle}}</a>
     </li>
   </ul>
    </div>
  </div>
   </div>
 </div>
  </div>
</nav>

Answer 1

我相信你需要的是这个：

  <ul class="group-links">
    <li class="second-link" ng-repeat="subchild in child.thirdLevelChildList | limitTo:4">
      <a ng-href="{{subchild.pagePath}}">{{subchild.pageTitle}}</a>
    </li>
    <li>
      <a href="#" ng-if="child.thirdLevelChildList.length > 4">Show All</a>
    </li>
  </ul>

注意：您在 <ul> 上进行了 ng-repeat。我假设您想重复列表项，而不是列表（基于 thirdLevelChildList 中的值，所以我以这种方式实现。

我使用 limitTo 来防止显示超过 4 个项目。我使用 ng-if 仅在大于 4 时显示 "Show All"。

Answer 2

您可以使用 limitTo 和一个变量来计算列表项的数量。您可以在控制器中设置此变量或使用 ng-init 如下所示

 <ul class="group-links" ng-init="count=4">
    <li class="second-link" ng-repeat="subchild in child.thirdLevelChildList | limitTo:count">
      <a ng-href="{{subchild.pagePath}}">{{subchild.pageTitle}}</a>
    </li>
    <li>
      <a ng-if="child.thirdLevelChildList.length > 4 && count == 4" ng-click="count=child.thirdLevelChildList.length">Show All</a>
    </li>
  </ul>

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