随着AngularJS我使用的ng-class方式如下：
<div class="bigIcon" data-ng-click="PickUp()"
ng-class="{first:'classA', second:'classB', third:'classC', fourth:'classC'}[call.State]"/>我想知道是否可以使用该if-else表达式执行与此类似的操作：
<div class="bigIcon" data-ng-click="PickUp()"
ng-class="{first:'classA', second:'classB', else:'classC'}[call.State]"/>因此，无论何时call.State不同于first或second使用classC并避免指定每个值？
Answers:
<div ng-class=" ... ? 'class-1' : ( ... ? 'class-2' : 'class-3')">例如 ：
<div ng-class="apt.name.length >= 15 ? 'col-md-12' : (apt.name.length >= 10 ? 'col-md-6' : 'col-md-4')">
...
</div>并确保您的同事可读：)
ng-class="{'class1': ##condition1## , 'class2': ##condition2## }"如您在上述问题中所见
您可以尝试使用类似的功能：
<div ng-class='whatClassIsIt(call.State)'>然后将您的逻辑放在函数本身中：
$scope.whatClassIsIt= function(someValue){
if(someValue=="first")
return "ClassA"
else if(someValue=="second")
return "ClassB";
else
return "ClassC";
}我用一个例子进行了摆弄：http : //jsfiddle.net/DotDotDot/nMk6M/
显然！我们可以使用下面的完整示例使函数返回CSS类名称。
的CSS
<style>
.Red {
color: Red;
}
.Yellow {
color: Yellow;
}
.Blue {
color: Blue;
}
.Green {
color: Green;
}
.Gray {
color: Gray;
}
.b{
font-weight: bold;
}
</style>JS
<script>
angular.module('myapp', [])
.controller('ExampleController', ['$scope', function ($scope) {
$scope.MyColors = ['It is Red', 'It is Yellow', 'It is Blue', 'It is Green', 'It is Gray'];
$scope.getClass = function (strValue) {
if (strValue == ("It is Red"))
return "Red";
else if (strValue == ("It is Yellow"))
return "Yellow";
else if (strValue == ("It is Blue"))
return "Blue";
else if (strValue == ("It is Green"))
return "Green";
else if (strValue == ("It is Gray"))
return "Gray";
}
}]);
</script>然后
<body ng-app="myapp" ng-controller="ExampleController">
<h2>AngularJS ng-class if example</h2>
<ul >
<li ng-repeat="icolor in MyColors" >
<p ng-class="[getClass(icolor), 'b']">{{icolor}}</p>
</li>
</ul>
<hr/>
<p>Other way using : ng-class="{'class1' : expression1, 'class2' : expression2,'class3':expression2,...}"</p>
<ul>
<li ng-repeat="icolor in MyColors">
<p ng-class="{'Red':icolor=='It is Red','Yellow':icolor=='It is Yellow','Blue':icolor=='It is Blue','Green':icolor=='It is Green','Gray':icolor=='It is Gray'}" class="b">{{icolor}}</p>
</li>
</ul>对于以某种方式带有背景图像的类，上述解决方案不适用于我。我要做的是创建一个默认类（其他情况下需要一个），并设置class ='defaultClass'，然后设置ng-class =“ {class1：abc，class2：xyz}”
<span class="booking_warning" ng-class="{ process_success: booking.bookingStatus == 'BOOKING_COMPLETED' || booking.bookingStatus == 'BOOKING_PROCESSED', booking_info: booking.bookingStatus == 'INSTANT_BOOKING_REQUEST_RECEIVED' || booking.bookingStatus == 'BOOKING_PENDING'}"> <strong>{{booking.bookingStatus}}</strong> </span>PS：处于条件中的类应覆盖默认类，即标记为！important
这是执行此操作的最佳和可靠的方法。这是一个简单的示例，之后您可以开发自定义逻辑：
//In .ts
public showUploadButton:boolean = false;
if(some logic)
{
//your logic
showUploadButton = true;
}
//In template
<button [class]="showUploadButton ? 'btn btn-default': 'btn btn-info'">Upload</button>我的一种解决方法是仅针对ng级切换操作模型变量：
例如，我想根据列表的状态切换类：
1）每当列表为空时，我都会更新模型：
$scope.extract = function(removeItemId) {
$scope.list= jQuery.grep($scope.list, function(item){return item.id != removeItemId});
if (!$scope.list.length) {
$scope.liststate = "empty";
}
}2）每当我的清单不为空时，我都会设定另一个状态
$scope.extract = function(item) {
$scope.list.push(item);
$scope.liststate = "notempty";
}3）当我的清单从未被触及时，我想再上一堂课（这是启动页面的地方）：
$scope.liststate = "init";3）我在ng-class上使用了这个附加模型：
ng-class="{'bg-empty': liststate == 'empty', 'bg-notempty': liststate == 'notempty', 'bg-init': liststate = 'init'}"您可以尝试以下方法：
</p><br /><br />
<p>ng-class="{test: obj.value1 == 'someothervalue' || obj.value2 == 'somethingelse'}<br /><br /><br />
ng-class="{test: obj.value1 == 'someothervalue' || obj.value2 == 'somethingelse'}您可以从此处获取完整的详细信息。