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?


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:)


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


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


我的一个变通方法是操纵一个模型变量,只是为了ng类切换:

例如,我想根据列表的状态切换类:

1)每当我的列表为空时,我更新我的模型:

$scope.extract = function(removeItemId) {
    $scope.list= jQuery.grep($scope.list, function(item){return item.id != removeItemId});
    if (!$scope.list.length) {
        $scope.liststate = "empty";
    }
}

2)当我的列表不空时,我设置另一个状态

$scope.extract = function(item) {
    $scope.list.push(item);
    $scope.liststate = "notempty";
}

3)当我的列表从未被触及时,我想给另一个类(这是页面初始化的地方):

$scope.liststate = "init";

3)我在ng课上使用了这个额外的模型:

ng-class="{'bg-empty': liststate == 'empty', 'bg-notempty': liststate == 'notempty', 'bg-init': liststate = 'init'}"

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


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>

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。


可以这样用:

    <div [ngClass]="{cssClass A: condition 1, cssClass B: condition 2, cssClass C: condition 3}">...</div>