如何使用 AngularJS 在点击时对列进行反向排序

我有一个简单的方法来对表列进行排序，但我无法找到一种方法来在单击和返回时反向排序之间进行交替。有人对这个问题有任何解决方案吗？下面是一个小提琴，向您展示我的意思。

<div ng-app="app">

<div ng-controller="controller">

    <p>{{orderProperty}}</p>
    <div class="col-md-10">
        <table class="table table-hover table-bordered">
            <thead>
            <tr>
                <th>Status<a ng-click="orderProperty = 'a'">^</a></th>
                <th>Ref<a ng-click="orderProperty = 'b'">^</a></th>
                <th>Service<a ng-click="orderProperty = 'c'">^</a></th>
                <th>Domain<a ng-click="orderProperty = 'd'">^</a></th>
                <th>Service Owner<a ng-click="orderProperty     = 'e'">^</a></th>
                <th>Stage<a ng-click="orderProperty = 'f'">^</a></th>
            </tr>
            </thead>
            <tbody>
                <tr ng-repeat="x in projects | orderBy:orderProperty">
                    <td><b>{{x.a}}</b></td>
                    <td>{{x.b}}</td>
                    <td>{{x.c}}</td>
                    <td>{{x.d}}</td>
                        <td>{{x.e}}</td>
                        <td>{{x.f}}</td>
                    </tr>
                </tbody>
            </table>
        </div>
    </div>
</div>

http://jsfiddle.net/ben1729/3nxykbhk/

您可以通过在列名称前添加“-”前缀来切换 orderProperty。 将表头替换为以下代码：

<thead>
    <tr>
        <th>Status<a ng-click="setOrderProperty('a')">^</a></th>
        <th>Ref<a ng-click="setOrderProperty('b')">^</a></th>
        <th>Service<a ng-click="setOrderProperty('c')">^</a></th>
        <th>Domain<a ng-click="setOrderProperty('d')">^</a></th>
        <th>Service Owner<a ng-click="setOrderProperty('e')">^</a></th>
        <th>Stage<a ng-click="setOrderProperty('f')">^</a></th>
    </tr>
</thead>

...并将此函数添加到您的范围中：

$scope.setOrderProperty = function(propertyName) {
    if ($scope.orderProperty === propertyName) {
        $scope.orderProperty = '-' + propertyName;
    } else if ($scope.orderProperty === '-' + propertyName) {
        $scope.orderProperty = propertyName;
    } else {
        $scope.orderProperty = propertyName;
    }
}

http://jsfiddle.net/3nxykbhk/1/