router.js

var Router = Ember.Router.extend({
  location: config.locationType,

  init: function () {
    this._super.apply(this, arguments);

    // Listen for the first transition, and trigger the `setupMapOnFirstLoad` action when it's complete.
    this.one('willTransition', function (transition) {
      transition.then(function () {
        // do something..
      });
    });
  }
});