Chantel Chantel - 7 months ago 77
Javascript Question

How to add and remove class with AngularJS?

I have a few buttons that work like switchers. If you click one it becomes active and "shuts down" other buttons. I did this using jQuery but would like to use AngularJS. Here is my code:

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

.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

You could have ng-click that can toggle selected flag, that could be use with ng-class to bind / unbind class.

Markup

<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>

Working Fiddle

Better way

You could easily do this by using ng-repeat which will reduce your line of code.

Markup

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

Code

<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>
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