I have a form directive that uses a specified callback attribute with an isolate scope:

scope: { callback: '&' }

It sits inside an ng-repeat so the expression I pass in includes the id of the object as an argument to the callback function:

<directive ng-repeat = item in stuff callback = callback(item.id)/>

When I've finished with the directive, it calls $scope.callback() from its controller function. For most cases this is fine, and it's all I want to do, but sometimes I'd like to add another argument from inside the directive itself.

Is there an angular expression that would allow this: $scope.callback(arg2), resulting in callback being called with arguments = [item.id, arg2]?

If not, what is the neatest way to do this?

I've found that this works:

<directive 

  ng-repeat = item in stuff 

  callback = callback 

  callback-arg=item.id/>

With

scope { callback: '=', callbackArg: '=' }

and the directive calling

$scope.callback.apply(null, [$scope.callbackArg].concat([arg2, arg3]) );

But I don't think it's particularly neat and it involves puting extra stuff in the isolate scope.

Is there a better way?

Plunker playground here (have the console open).