AngularJS : The correct way of binding to a service properties

Question

I’m looking for the best practice of how to bind to a service property in AngularJS.

I have worked through multiple examples to understand how to bind to properties

Answer 1

The Most Elegant Solutions...

app.service('svc', function(){ this.attr = []; return this; });
app.controller('ctrl', function($scope, svc){
    $scope.attr = svc.attr || [];
    $scope.$watch('attr', function(neo, old){ /* if necessary */ });
});
app.run(function($rootScope, svc){
    $rootScope.svc = svc;
    $rootScope.$watch('svc', function(neo, old){ /* change the world */ });
});

Also, I write EDAs (Event-Driven Architectures) so I tend to do something like the following [oversimplified version]:

var Service = function Service($rootScope) {
    var $scope = $rootScope.$new(this);
    $scope.that = [];
    $scope.$watch('that', thatObserver, true);
    function thatObserver(what) {
        $scope.$broadcast('that:changed', what);
    }
};

Then, I put a listener in my controller on the desired channel and just keep my local scope up to date this way.

In conclusion, there's not much of a "Best Practice" -- rather, its mostly preference -- as long as you're keeping things SOLID and employing weak coupling. The reason I would advocate the latter code is because EDAs have the lowest coupling feasible by nature. And if you aren't too concerned about this fact, let us avoid working on the same project together.

Hope this helps...