javascript - ng-show does not run animation only on load -


i have following html:

<div class="container w-xxxl w-auto-xs " ng-controller="surveyquizcontroller">     <div class="panel box-shadow fade-in-right " style="opacity: 0.9" ng-repeat="question in questions" ng-show="current_question == $index">         <div class="panel-heading b-b">             <h1 class="h2 margin-none">{{question.question.question}}?</h1>         </div>         <div class="panel-body">             <div class="form-group">                 <multiple ng-show="question.question.question_type_id == 1"></multiple>             </div>         </div>         <div class="panel-footer text-center">             <strong class="small">{{$index+1}} out of {{questions.length}} questions</strong>             <div class="clear">                 <a class="btn btn-default pull-left {{$index == 0 ? 'disabled' : ''}}" ng-click="previousquestion()">prev</a>                 <a  class="btn btn-primary pull-right" ng-click="nextquestion()">next</a>             </div>         </div>     </div>  </div>

each panel has class: fade-in-right has following definition:

    .fade-in-right.ng-enter {     -webkit-animation: fadeinright 0.5s;     animation: fadeinright 0.5s; }  .fade-in-right.ng-leave {     -webkit-animation: fadeoutleft 0.5s;     animation: fadeoutleft 0.5s; }

however when element hidden ng-show animation not trigger.

can tell me why?

to remove jump , show 1 element @ time see angular: applying animations / animating ngview css keyframe animations

angular.module('app', ['nganimate']).controller('controller', function($scope) {    $scope.questions = [{      title: 'question 1'    }, {      title: 'question 2'    }, {      title: 'question 3'    }, {      title: 'question 4'    }, {      title: 'question 5'    }];  });
.view-container {    position: relative;  }  .fade-in.ng-enter,  .fade-in.ng-leave {    background: white;    position: absolute;    top: 0;    left: 0;    right: 0;  }  .fade-in.ng-enter {    -webkit-animation: 0.5s fade-in;    -moz-animation: 0.5s fade-in;    -o-animation: 0.5s fade-in;    animation: 0.5s fade-in;    z-index: 100;  }  .fade-in.ng-leave {    -webkit-animation: 0.5s fade-out;    -moz-animation: 0.5s fade-out;    -o-animation: 0.5s fade-out;    animation: 0.5s fade-out;    z-index: 99;  }  @keyframes fade-in {    {      opacity: 0;    }    {      opacity: 1;    }  }  @-moz-keyframes fade-in {    {      opacity: 0;    }    {      opacity: 1;    }  }  @-webkit-keyframes fade-in {    {      opacity: 0;    }    {      opacity: 1;    }  }  @keyframes fade-out {    {      opacity: 1;    }    {      opacity: 0;    }  }  @-moz-keyframes fade-out {    {      opacity: 1;    }    {      opacity: 0;    }  }  @-webkit-keyframes fade-out {    {      opacity: 1;    }    {      opacity: 0;    }  }
<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.css" rel="stylesheet" />  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>  <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.2.23/angular-animate.js"></script>  <div ng-app="app" class="container w-xxxl w-auto-xs " ng-controller="controller">    <div class="btn-group" role="group" aria-label="...">      <button type="button" class="btn btn-default" ng-click="current_question = 0">1</button>      <button type="button" class="btn btn-default" ng-click="current_question = 1">2</button>      <button type="button" class="btn btn-default" ng-click="current_question = 2">3</button>      <button type="button" class="btn btn-default" ng-click="current_question = 3">4</button>      <button type="button" class="btn btn-default" ng-click="current_question = 4">5</button>    </div>    <div class="view-container">      <div class="panel box-shadow fade-in" style="opacity: 0.9" ng-repeat="question in questions" ng-if="current_question == $index">        <div class="panel-heading b-b">          <h1 class="h2 margin-none">{{question.title}}?</h1>        </div>        </div>      </div>  </div>


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