angularjs – 根据值应用ng-class

<tr ng-repeat="scores in Test" ng-class="{true: 'warning',false: 'ok'}[scores.InDicator == 'Negative']">                       
     <td>Overall: {{ scores.InDicator }}</td>
</tr>

.warning {
    BACkground: red;
}

.ok {
    BACkground: green;
}

我还没有看到之前使用的特定语法,{true：’warning’,false：’ok’} [scores.InDicator ==’Negative’]背后的理由是什么？

我在这里使用NgClass的方式是

<tr ng-repeat="scores in Test" ng-class="{warning: (scores.InDicator == 'Negative'),ok: (scores.InDicator != 'Negative')}">

那样有用吗？

为了更好的可读性,您也可以将其委托给控制器

<tr ng-repeat="scores in Test" ng-class="scoreClass(scores)">

$scope.scoreClass = function(scores) {
    return scores.InDicator == 'Negative' ? 'warning': 'ok';
}

或者你可以创建一个指令

<tr ng-repeat="scores in Test" score-class scores="scores">

.directive('scoreClass',[function() {

    return {
        reStrict: 'A',scope: {
            scores: '=',},link: function(scope,element,attrs,controller) {
            scope.$watch('scores',function() {
                element.removeClass('ok');
                element.removeClass('warning');
                if (scope.scores.InDicator == 'Negative') {
                    element.addClass('warning');
                } else {
                    element.addClass('ok');
                }
            },truE);
        }
    };
}]);