angularjs compile ng-controller and interpolation

Question

On the docs I saw an example of compiling "something" added later.

var $div = $('<div ng-controller="MyCtrl">{{content.label}}</div>');
$(document.body).append($div);

angular.element(document).injector().invoke(function($compile) {
  var scope = angular.element($div).scope();
  $compile($div)(scope);
});

I've added this code on a jquery ready function, but I have two problems:

First is an error: Argument 'MyCtrl' is not a function, got undefined.

The second is that I don't know how to make that content.label works! I've added it to the scope but it doesn't work. How should I call my controller to see working the data binding of content.label?

MY FINAL MODIFIED CODE IS:

var app = angular.module('app',[]);

    $(function(){

        app.controller('MyCtrl',function($scope){
            $scope.content = 123;
        });

        var $div = $('<div ng-controller="MyCtrl">{{content}}</div>');
        $(document.body).append($div);

        angular.element(document).injector().invoke(function($compile) {
          var scope = angular.element($div).scope();
          $compile($div)(scope);
        });

    });

Answer 1

UPDATE

You should start a digest cycle after compiling new markup, in order to build all bindings and fire watchers. This can be done by calling scope.$digest(); :

$compile($div)(scope);
scope.$digest();

The result should look like:

var app = angular.module('app',[]);
  app.controller('MyCtrl',function($scope){
      $scope.content = 123;
  });

  angular.element(document).ready(function () {
      var $div = $('<div ng-controller="MyCtrl">{{content}}  </div>');
      $(document.body).append($div);

      angular.element(document).injector().invoke(function($compile) {
        var scope = angular.element($div).scope();
        $compile($div)(scope);
        scope.$digest();
      });

  });

http://plnkr.co/edit/dDNBxf8SowKTPgnVj0tF?p=preview