angular-state-router/src/services/resolution.js

An AngularJS state-based router designed for flexibility and ease of use.

'use strict';

module.exports = ['$q', '$injector', '$state', '$rootScope', function($q, $injector, $state, $rootScope) {

  // Instance
  var _self = {};

  /**
   * Resolve
   * 
   * @param  {Object}  resolve A hash Object of items to resolve
   * @return {Promise}         A promise fulfilled when templates retireved
   */
  var _resolve = function(resolve) {
    var resolvesPromises = {};

    angular.forEach(resolve, function(value, key) {
      var resolution = angular.isString(value) ? $injector.get(value) : $injector.invoke(value, null, null, key);
      resolvesPromises[key] = $q.when(resolution);
    });

    return $q.all(resolvesPromises);
  };
  _self.resolve = _resolve;

  /**
   * Register middleware layer
   */
  _self.$ready = function() {

    $state.$use(function(request, next) {
      var current = $state.current();

      if(!current) {
        return next();
      }

      $rootScope.$broadcast('$stateResolveBegin');

      _resolve(current.resolve || {}).then(function(locals) {
        angular.extend(request.locals, locals);
        $rootScope.$broadcast('$stateResolveEnd');
        next();

      }, function(err) {
        $rootScope.$broadcast('$stateResolveError', err);
        next(new Error('Error resolving state'));
      });
    }, 101);
    
  };

  return _self;
}];