beforeAndAfter.js

(function() {
  _.extend(Backbone.Router.prototype, Backbone.Events, {
    before: function(){},
    after : function(){},
    route : function(route, name, callback) {
      Backbone.history || (Backbone.history = new Backbone.History);
      if (!_.isRegExp(route)) route = this._routeToRegExp(route);
      Backbone.history.route(route, _.bind(function(fragment) {
        var args = this._extractParameters(route, fragment);
        if( _(this.before).isFunction() ){
          var self = this;
          args.next = function(){
            callback.apply(self, args);
          };
          this.before.call(this, args);
        }else{
          callback.apply(this, args);
        }
        if( _(this.after).isFunction() ){
          this.after.apply(this, args);
        }
        this.trigger.apply(this, ['route:' + name].concat(args));
      }, this));
    }
  });
}).call(this);