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Question

I'm trying to use Angular's "decorator" capability to add functionality to some directives. Assume that my directive's name is myDirective. My code looks like this:

angular.module('app').config([
  '$provide', function($provide) {
    return $provide.decorator('myDirective', [
      '$delegate', '$log', function($delegate, $log) {
        // TODO - It worked!  Do something to modify the behavior

        $log.info("In decorator");
      }
    ]);
  }

]);

I keep getting this message:

Uncaught Error: [$injector:unpr] Unknown provider: myDirectiveProvider from app 

To the best of my ability, the directives are already registered by the time the decorator function runs. Any insight would be appreciated!

Answer 1

This article shows how you can, in fact, use decorator() with directives.

You just have to include "Directive" as the suffix for the name. Hence, in my example I should have been doing

return $provide.decorator('myDirectiveDirective', ['$delegate', '$log', function($delegate, $log) {
    // TODO - It worked!  Do something to modify the behavior
    $log.info("In decorator");

    // Article uses index 0 but I found that index 0 was "window" and index 1 was the directive
    var directive = $delegate[1];
}

http://angular-tips.com/blog/2013/09/experiment-decorating-directives/

Answer 2

Decorators as created with the decorator method are for services only. They have to be created with service , factory , provider or value . See the docs here .

If you want to decorate a directive, you can make another directive with the same name. Both directives will be used when the DOM is compiled, and you can define the compilation order using priority .

Alternatively, if you are able to modify the code that uses the directive you are trying to decorate, then you can just make a new directive that uses the original in its template.