javascript - Create a YouTube AngularJS Directive

Question

I created the following AngularJS directive to embed youtube videos:

// A Simple youtube embed directive
.directive('youtube', function() {
  return {
    restrict: 'EA',
    scope: { code:'=' },
    replace: true,
    template: '<div style="height:400px;"><iframe style="overflow:hidden;height:100%;width:100%" width="100%" height="100%" src="http://www.youtube.com/embed/{{code}}" frameborder="0" allowfullscreen></iframe>'
  };
});

When I call it from my template <youtube code="r1TK_crUbBY"></youtube>, I get the following error:

Error: [$interpolate:noconcat] Error while interpolating: http://www.youtube.com/embed/{{code}} Strict Contextual Escaping disallows interpolations that concatenate multiple expressions when a trusted value is required. See http://docs.angularjs.org/api/ng.$sce

I can't identify what's wrong with the directive in the {{code}} expression.

Answer 1

With Angular 1.2, you need to inject $sce service and trustAsResourceURL the src of an iframe.

Demo: http://plnkr.co/edit/0N728e9SAtXg3uBvuXKF?p=preview

.directive('youtube', function($sce) {
  return {
    restrict: 'EA',
    scope: { code:'=' },
    replace: true,
    template: '<div style="height:400px;"><iframe style="overflow:hidden;height:100%;width:100%" width="100%" height="100%" src="{{url}}" frameborder="0" allowfullscreen></iframe></div>',
    link: function (scope) {
        scope.$watch('code', function (newVal) {
           if (newVal) {
               scope.url = $sce.trustAsResourceUrl("http://www.youtube.com/embed/" + newVal);
           }
        });
    }
  };
});

Also see: Migrate from 1.0 to 1.2 and related question.