Show Circle-Loader with show/hide button

by Michael Hunziker

HTML

<script src="https://code.angularjs.org/1.3.1/angular.js"></script>
<body ng-app="loader">
<div ng-controller="loaderController">
  <button ng-click="showLoader()">Show Loader</button>
  <button ng-click="hideLoader()">Hide Loader</button>
  <div ng-show="showing">
    <div circle></div>
  </div>  
</div>
</body>

CSS

.ouro {
    position: relative;
    display:inline-block;
    height: 46px;
    width: 46px;
    margin: 1em;
    border-radius: 50%;  
    background: none repeat scroll 0 0 #DDDDDD;
    overflow:hidden;
    box-shadow: 0 0 10px rgba(0,0,0,.1) inset, 0 0 25px    rgba(0,0,255,0.075);
}

.ouro:after {
    content: "";
    position: absolute;
    top: 9px; left: 9px;
    display: block;
    height: 28px; width: 28px;
    background: none repeat scroll 0 0 #F2F2F2;
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(0,0,0,.1);
}

.ouro > span {
    position: absolute;
    height: 100%; width: 50%;
    overflow: hidden;
}

.left  { left:0   }

.right { left:50% }

.anim {
    position: absolute;
    left: 100%; top: 0;
    height: 100%; width: 100%;
    border-radius: 999px;
    background: none repeat scroll 0 0 #508EC3;
    opacity: 0.8;
    -webkit-animation: ui-spinner-rotate-left 3s infinite;
    animation: ui-spinner-rotate-left 3s infinite;
    -webkit-transform-origin: 0 50% 0;
    transform-origin: 0 50% 0;
}

.left .anim {
    border-bottom-left-radius: 0;
    border-top-left-radius: 0;
}

.right .anim {
    border-bottom-right-radius: 0;
    border-top-right-radius: 0;
    left: -100%;
    -webkit-transform-origin: 100% 50% 0;
    transform-origin: 100% 50% 0;
}

.ouro3 .anim {
   -webkit-animation-delay: 0s;
   -webkit-animation-duration:3s;
   -webkit-animation-timing-function: linear;
   animation-delay: 0s;
   animation-duration:3s;
   animation-timing-function: linear;
}

.ouro3 .right .anim{
   -webkit-animation-name: ui-spinner-rotate-right;
   -webkit-animation-delay:0;
   -webkit-animation-delay: 1.5s;
   animation-name: ui-spinner-rotate-right;
   animation-delay:0;
   animation-delay: 1.5s;
}

@keyframes ui-spinner-rotate-right{
  0%{transform:rotate(0deg)}
  25%{transform:rotate(180deg)}
  50%{transform:rotate(180deg)}
  75%{transform:rotate(360deg)}
  100%{transform:rotate(360deg)}
}

@keyframes ui-spinner-rotate-left{
 ...

JavaScript

angular.module('loader', [])
    .controller('loaderController', function($scope){
      $scope.showing = false;
      
      $scope.showLoader = function(){
        $scope.showing = true;
      };
      
      $scope.hideLoader = function(){
        $scope.showing = false;
      };

    })
    .directive('circle',function() {
      return {
        template: '<span class="ouro ouro3">' +
                      '<span class="left"><span class="anim"></span></span>' +
                      '<span class="right"><span class="anim"></span></span>' +
                    '</span>'
      }
    });