在AngularJS中，我使用ng-class的方式如下:
<div class="bigIcon" data-ng-click="PickUp()"
ng-class="{first:'classA', second:'classB', third:'classC', fourth:'classC'}[call.State]"/>
我想知道我是否可以使用if-else表达式来做类似的事情:
<div class="bigIcon" data-ng-click="PickUp()"
ng-class="{first:'classA', second:'classB', else:'classC'}[call.State]"/>
所以无论何时调用。状态不同于第一次或第二次使用classC和避免指定每个值?
当前回答
上面的解决方案对我来说并不适用于有背景图像的类。我所做的是我创建了一个默认类(你需要在else中)，并设置class='defaultClass'，然后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>
注:处于condition状态的类应该覆盖默认类，即标记为!important的类
其他回答
这是做到这一点的最佳和可靠的方法。 下面是一个简单的例子，之后你可以开发你的自定义逻辑:
//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>
很明显!我们可以用下面的例子创建一个函数来返回一个CSS类名。
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>
你可以参考ng-class的完整代码页if example
你可以试试这个方法:
</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'}
你可以从这里得到完整的细节。
你可以尝试使用这样的函数:
<div ng-class='whatClassIsIt(call.State)'>
然后把你的逻辑放到函数本身:
$scope.whatClassIsIt= function(someValue){
if(someValue=="first")
return "ClassA"
else if(someValue=="second")
return "ClassB";
else
return "ClassC";
}
我摆弄了一个例子:http://jsfiddle.net/DotDotDot/nMk6M/
使用嵌套的内联if-then语句(三元运算符)
<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>
并确保你的同事都能读懂:)
