jquery - Watch another elements classes with AngularJS -

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i use bootstrap javascript components create toggleable panels. each panel class in set, if opened. i'd show font awesome icon depending on current panel state.

fa fa-angle-up when it's open, , fa fa-angle-down when it's closed.

however have difficulties achieving it, can't figure out proper angularjs way it. current approach using jquery hasclass() method check class , apply correct font awesome class arrow.

as jquery doesn't support two-way-databinding has issues. i've figured is, method called once , proper class set arrow, when open/close panel ng-class doesn't re-evaluated switch it.

what correct "angular-way" achieving this?

<div class="panel panel-default">     <div class="panel-heading" role="tab" id="headlineedit">         <h4 class="panel-title">             <a class="collapsed" data-toggle="collapse" data-target='#collapseedit' href="#collapseedit" aria-expanded="false" aria-controls="collapseedit">                 <div class="leftside">edit</div>                 <div class="rightside arrow-show"><span class="fa" ng-class="$('#collapseedit').hasclass('in') ? 'fa-angle-up' : 'fa-angle-down'"></span></div>                 <div class="clear"></div>             </a>         </h4>     </div>      <!-- "in" class determines whether panel opened or closed -->     <div id="collapseedit" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headlineedit">         <div class="panel-body">             placeholder text         </div>     </div> </div>

here's way directive:

app.directive('test',function(){   return{     link: function(scope, el, attr) {        angular.element(el[0].queryselector('.rightside > .fa')).addclass('fa-angle-up');        el.on('hide.bs.collapse', function(ev){         angular.element(el[0].queryselector('.rightside > .fa'))           .removeclass('fa-angle-up')           .addclass('fa-angle-down');       });        el.on('show.bs.collapse', function(ev){         angular.element(el[0].queryselector('.rightside > .fa'))           .removeclass('fa-angle-down')           .addclass('fa-angle-up');        });     }   } });

and remove ng-class attribute html.

here's plunker: http://plnkr.co/edit/xo8oqc68zrwtiha5ajdi?p=preview


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