在 angularJS 中显示基于条件的链接

Question

我正在AngularJS中创建一个导航栏。 我分别在鼠标悬停和鼠标离开"div.menu-links"上显示和隐藏子菜单"div.farm-links"。

现在，在我的子菜单中，每当"child.threeLevelChildList.length"大于5时，它应该将第5个链接显示为"查看全部"并隐藏所有剩余的链接。否则，它应该显示所有链接。

例如，在鼠标悬停在"关于abc"的"公司"下，我应该只看到："战略"，"使命，愿景，价值观"，"领导力"，"组织结构图"和第5个链接作为"查看全部"。

我如何实现这一点？ 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：

<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：你在<ul>上重复了ng。我假设你想重复列表项，而不是列表(基于第三级儿童列表中的值，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"全部显示"。

Answer 2

可以使用limitToto 和变量来保持列表项数的计数。您可以在控制器中设置此变量，也可以使用如下所示ng-init

<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>