Retrieving the content of a dynamic template with Angular-UI-Router

Currently, I am in the process of developing an angular application utilizing angular-ui-router. The backend of the application consists of a REST api that provides a form URL based on a specific ticket id. My aim is to dynamically set the template in app.js by making a query to this REST service. Here is an example:

$stateProvider
  .state('form', {
    url: '/form/:id',
    templateProvider: function ($resource, formResolver, $stateParams) {

      // The formResolver function makes a call to the REST API using the form id and retrieves a URL.
      return formResolver.resolve($stateParams.id).then(function(url) {
        return $resource(url).get();
      };

    },
    controller: 'MyCtrl'
  });

The challenge I am encountering is that the function returns a promise while templateProvider requires a string content. My goal is to simply return the URL:

$stateProvider
  .state('form', {
    url: '/form/:id',

    // I want to inject formResolver, however, it is not possible
    templateUrl: function (stateParams, formResolver) {
      return formResolver.resolve(stateParams.id);
    },
    controller: 'MyCtrl'
  });

However, while using templateUrl instead of templateProvider as explained in https://github.com/angular-ui/ui-router/wiki#wiki-templates, I do not receive dependency injection and I am still faced with the issue of returning a promise. It seems like my only solution may be to avoid using the promise API altogether.

Answer №1

After investigating further, I discovered an issue in my implementation of $resource. It was unclear where the problem lay. Upon examining the source code for angular-ui-router, I realized that the function can indeed return a promise. To resolve this, I resorted to borrowing some code snippets from https://github.com/angular-ui/ui-router/blob/master/src/templateFactory.js and came up with the following solution:

    templateProvider: function ($http, formService, $stateParams) {
      return formService.getFormUrl($stateParams.id).then(function(url) {
        return $http.get(url);
      }).then(function(response) {
        return response.data;
      })

Answer №2

When utilizing the templateProvider function, it is important to note that while it can return a promise from $resource, ultimately it must return a string.

templateProvider: function (SomeService) {

    var promise = SomeService.get().$promise;

    promise.then(function (data) {
        console.log(data) // The value returned must be a string!
    });

    return promise; 
}

If the data returned is an object, one method to handle this is by creating another promise.

templateProvider: function (SomeService, $q) {

    var defer = $q.defer();

    var promise = SomeService.get().$promise;

    promise.then(function (data) {
        console.log(data) // Assume the data is {html: '<p>some template</p>'}
        defer.resolve(data.html);
    });

    return defer.promise; 
}

SomeService is responsible for returning $resource.

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