如何使用AngularJS添加和删除类？

Question

我有一些像切换器一样工作的按钮.如果单击一个,它将变为活动状态并"关闭"其他按钮.我使用jQuery做了这个,但想使用AngularJS.这是我的代码:

HTML

<div class="button-bar">
    <a class="button button-energized" id="weak">weak</a>
    <a class="button button-energized" id="normal">normal</a>
    <a class="button button-energized" id="strong">strong</a>
</div>

JavaScript的

    .controller('AppCtrl', function($scope, $stateParams) {

        $('#weak').click(function() {
            $('#weak').addClass('active');
            $('#normal').removeClass('active');
            $('#strong').removeClass('active');
        });

        $('#normal').click(function() {
            $('#normal').addClass('active');
            $('#weak').removeClass('active');
            $('#strong').removeClass('active');
        });

        $('#strong').click(function() {
            $('#strong').addClass('active');
            $('#normal').removeClass('active');
            $('#weak').removeClass('active');
        });

   });

Answer 1

你可以有ng-click那个可以切换selected标志,可以ng-class用于绑定/解除绑定类.

标记

<div class="button-bar">
    <a class="button button-energized" id="weak" 
       ng-class="{active: $parent.selected=='weak'}" ng-click="$parent.selected='weak'">
      weak
    </a>
    <a class="button button-energized" id="normal" 
       ng-class="{active: selected=='normal'}" ng-click="selected='normal'">
        normal
    </a>
    <a class="button button-energized" id="strong" 
       ng-class="{active: selected=='strong'}" ng-click="selected='strong'">
        strong
    </a>
</div>

工作小提琴

更好的方法

你可以通过使用ng-repeat它来轻松地做到这一点,这将减少你的代码行.

标记

$scope.strengths = ["weak","normal","strong"];

码

<div class="button-bar">
    <a class="button button-energized" id="{{strength}}" 
       ng-class="{active: $parent.selected == strength}" 
       ng-click="$parent.selected=strength"
       ng-repeat="strength in strengths">
      {{strength}}
    </a>
</div>