Using resolve in $routeProvider causes 'Unknown provider ...'

Question

I am trying to do an asynchronous http request to load some data before my app loads and so I am using a resolve in $routeProvider which is an http request in my MainController. For some reason, I keep getting Error: [$injector:unpr] Unknown provider: appDataProvider <- appData where appData is where I do my http request. I am using AngularJS v 1.2.5.

Here is the code and two methods that I tried that both give the same error:

Method #1

MainController.js

var MainController = ['$scope','$location','appData',
    function($scope, $location, appData){
       console.log(appData.data);
    }
];

MainController.loadData = {
    appData: function($http, $location, MainFactory){
        var aid = MainFactory.extractAid($location);
        return $http({method: 'GET', url: URL_CONST + aid});
    }
};

app.js

var app = angular.module('HAY', ['ngRoute']);

app.config(function($routeProvider) {
  $routeProvider
    .when('/', {
      redirectTo: '/pages/alerts'
    })
    .when('/pages/:pageName', {
        templateUrl: function(params) {
            return 'views/pages/' + params.pageName + '.html';
        },
        controller: MainController,
        resolve: MainController.loadData
    })
    .otherwise({
        redirectTo: '/pages/alerts'
    });
});

I tried changing the name in case it was a conflicting system reserved keyword but with no luck. For some reason, appData is never recognized

Method #2 I also tried changing it around like so:

app.js

var app = angular.module('HEY', ['ngRoute']);

app.config(function($routeProvider) {
  $routeProvider
    .when('/', {
      redirectTo: '/pages/alerts'
    })
    .when('/pages/:pageName', {
        templateUrl: function(params) {
            return 'views/pages/' + params.pageName + '.html';
        },
        controller: MainController,
        resolve: {
                appData: ['$http', '$location','MainFactory', function($http, $location, MainFactory) {
                    var aid = MainFactory.extractAid($location);
                    return $http({method: 'GET', url: URL_CONST + aid});
                }]
        }
    })
    .otherwise({
        redirectTo: '/pages/alerts'
    });
});

MainController.js

var MainController = ['$scope','$location','appData',
    function($scope, $location, appData){
        console.log(resolvedData);
    }
];

However, the result was exactly the same. Does this have something to do with angular 1.2.5 ?

Here is a working version from someone else

http://mhevery.github.io/angular-phonecat/app/#/phones

And here is the code:

function PhoneListCtrl($scope, phones) {
  $scope.phones = phones;
  $scope.orderProp = 'age';
}

PhoneListCtrl.resolve = {
  phones: function(Phone) {
    return Phone.query();
  },
  delay: function($q, $defer) {
    var delay = $q.defer();
    $defer(delay.resolve, 1000);
    return delay.promise;
  }
}

angular.module('phonecat', ['phonecatFilters', 'phonecatServices', 'phonecatDirectives']).
  config(['$routeProvider', function($routeProvider) {
    $routeProvider.
        when('/phones', {templateUrl: 'partials/phone-list.html', controller: PhoneListCtrl, resolve: PhoneListCtrl.resolve}).
        otherwise({redirectTo: '/phones'});
  }]);

Answer 1

Here's an example of the code I've used in the application I'm working on, not sure it will help much because its not much different than how you have it already.

Routing

.when('/view/proposal/:id',{
    controller : 'viewProposalCtrl',
    templateURL : 'tmpls/get/proposal/view',
    resolve : viewProposalCtrl.resolveViewProposal
})

Controller

var viewProposalCtrl = angular.module('proposal.controllers')
    .controller('viewProposalCtrl',['$scope','contacts','details','rationale',
        function($scope,contacts,details,rationale){
            $scope.contacts = contacts;
            $scope.details = details;
            $scope.rationale = rationale;

            // [ REST OF CONTROLLER CODE ]
        });


// proposalSrv is a factory service

viewProposalCtrl.resolveViewProposal = {
    contacts : ['$route','proposalSrv',function($route,proposalSrv){
        return proposalSrv.get('Contacts',$route.current.params.id)
           .then(function(data){
               return data.data.contacts;
           },function(){
               return [];
           });
    }],
    details : ['$route','proposalSrv',function($route,proposalSrv){
        return proposalSrv.get('Details',$route.current.params.id)
            .then(function(data){
                return data.data.details;
            },function(){
                return {};
            });
    }],
    rationale : ['$route','proposalSrv',function($route,proposalSrv){
        return proposalSrv.get('Rationale',$route.current.params.id)
            .then(function(data){
                return data.data.rationale;
            },function(){
                return {};
            ]
    }]
};

Now that I think about it, when I was developing my application I did have a problem and not sure why when I named my resolve function "resolve." This gave me a problem:

.when('/path',{
     // stuff here
     resolve : myCtrlr.resolve
})

but this did not:

.when('/path',{
     //stuff here
     resolve : myCtrlr.myResolveFn
})

Another Possibility

The only other thing I can think of, is that you're returning the promise from the $http call and then trying to use appData.data Try using the .then function or one of the other functions (.success,.error) to retrieve the information from the promise.

Answer 2

The problem was NOT due to previously using different version of AngularJS.

Here are the fixes using the code that I have above.

In app.js, you need to declare the controller as controller: 'MainController' and NOT as controller: MainController even though you have var MainController = app.controller('MainController', ....).

Second and biggest thing was that in my index.html I declared my controller already like so:

index.html

body ng-app="HEY" controller="MainController" /body

This was causing the whole Unknown provider error Apparently angular wont tell you that you have already declared the controller that you are using to do the resolve it and that that will cause a weird error that have nothing to do with the resolve.

I hope this helps someone who may have the same problem.

Answer 3

One thing I noticed in angular 1x docs is that YOU DO NOT SPECIFY THE RESOLVED PARAMETER AS AN ANNOTATED DEPENDENCY

So this:

.when('/somewhere', {
  template: '<some-component></some-component>',
  resolve: {
    resolvedFromRouter: () => someService.fetch()
  }
})

export default [
  '$scope',
  'someService',
  'resolvedFromRouter'
  Controller
]

function Controller($scope, someService, resolvedFromRouter) {
  // <= unknown provider "resolvedFromRouter"
}

is wrong. You don't specify the resolved parameter as a dependency, in the docs:

For easier access to the resolved dependencies from the template, the resolve map will be available on the scope of the route, under $resolve (by default) or a custom name specified by the resolveAs property (see below). This can be particularly useful, when working with components as route templates.

So just do this instead:

.when('/somewhere', {
  template: '<some-component></some-component>',
  resolve: {
    resolvedFromRouter: () => someService.fetch()
  }
})

export default [
  '$scope',
  'someService',
  Controller
]

function Controller($scope, someService) {
  $scope.$resolve.resolvedFromRouter; // <= injected here
}