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
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:)
其他回答
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/
我有一个情况，我需要两个“如果”语句，可以都为真和一个“else”或默认，如果都不为真，不确定这是否对Jossef的答案有所改进，但对我来说似乎更干净:
ng-class="{'class-one' : value.one , 'class-two' : value.two}" class="else-class"
价值的地方。一和值。有两个是正确的，它们优先于。else类
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:)
可以这样用:
<div [ngClass]="{cssClass A: condition 1, cssClass B: condition 2, cssClass C: condition 3}">...</div>
