Animate the update of a $scope variable in AngularJS on a <p> tag

$interval(function() {
        var count = $scope.announcements.length;
        for(var i=0;i<count;i++) {
            if($scope.announcement == $scope.announcements[i].description) {
                if(i==count-1) {
                    $scope.announcement  = $scope.announcements[0].description;
                    if($scope.announcement.length >= 100) {
                        $scope.readmore     = true;
                        $scope.short_ann    = $scope.announcement.substr(0,85);
                    }
                    break;
                } else {
                    $scope.announcement  = $scope.announcements[i+1].description;
                    if($scope.announcement.length >= 100) {
                        $scope.readmore     = true;
                        $scope.short_ann    = $scope.announcement.substr(0,85);
                    }
                    break;
                }
            }
        } 
    }, 5000);

An animation is wanted to accompany the update of $scope.announcement every 5 seconds when changing ng-bind.

javascriptangularjs

Answer №1

Develop a custom directive that monitors changes in a specific property and triggers an animation accordingly.

Here is an example implementation:

app.directive('flash', ['$animate',
  function($animate) {
    return {
      link: function(scope, element, attrs) {

        scope.$watch(attrs.flash, function(newValue, oldValue) {

          if (newValue === oldValue) return;

          $animate.addClass(element, 'flash').then(function() {
            element.removeClass('flash');
          });
        });
      }
    };
  }
]);

Usage:

<p flash="announcement" class="animated">{{announcement}}</p>

If you prefer using ng-bind, here is an alternative usage:

<p flash ng-bind="announcement" class="animated"></p>

In the second version, make sure to watch attrs.ngBind instead of attrs.flash:

scope.$watch(attrs.ngBind, ...

Keep in mind that this demonstration relies on ngAnimate and animate.css for the animation effects.

Check out the live demo: http://plnkr.co/edit/R0dWpE0VSscqE4mJ6462?p=preview

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