What are the steps to utilizing an angular-js $resource?

Question

What are the steps to utilizing an angular-js $resource?

Struggling to implement the angular-js $resource function in an app built with the ionic framework. Having trouble getting it to work. Relevant code:

Service.js

.factory('Pages', function($resource) {
    var source = $resource("http://localhost:5432/api/pages",{},
    {query: { method: "GET", isArray: false }});
    return source;
})

controllers.js

.controller('PagesCtrl', function($scope, Pages) {
$scope.pages =  Pages.query();
$scope.results = $scope.pages.results;
console.log($scope.results);
})

browse.html

<ion-view view-title="Browse">
  <ion-content>
    <h1>Browser</h1>
    <ion-list>
      <ion-item ng-repeat="page in results">
        <h2>{{page.title}}</h2>
      </ion-item>

    </ion-list>
  </ion-content>
 </ion-view>

and the data

{
"count": 2,
"next": null,
"previous": null,
"results": [
    {
        "id": 1,
        "parent": null,
        "title": "Blog",
        "content": "<p>Blog</p>",
        "content_model": "richtextpage",
        "slug": "blog",
        "publish_date": null,
        "login_required": false,
        "meta_description": "Blog",
        "tags": ""
    },
    {
        "id": 2,
        "parent": null,
        "title": "Lorem Ipsum",
        "content": "Lorem ipsum ....",
        "tags": ""
    }
]
}

Despite efforts, the console log (in controllers.js) consistently shows 'undefined'. Been troubleshooting for hours without success.

javascript angularjs

Answer 1

Answer №1

When using the .query() method, the result object returned is a promise that will eventually contain the result.

It's important to note that when you attempt to access the result property of your payload, the request may not have finished yet.

Thankfully, Angular's ng-repeat statement has built-in support for promises. In your view file, browse.html, you can simply use:

<ion-item ng-repeat="page in pages.results">

This eliminates the need to handle $scope.results in your controller, resulting in cleaner code overall.

Answer 2

When using the .query() method, the result object returned is a promise that will eventually contain the result.

It's important to note that when you attempt to access the result property of your payload, the request may not have finished yet.

Thankfully, Angular's ng-repeat statement has built-in support for promises. In your view file, browse.html, you can simply use:

<ion-item ng-repeat="page in pages.results">

This eliminates the need to handle $scope.results in your controller, resulting in cleaner code overall.

Answer 3

Answer №2

Remember that $scope.pages is a promise object. If you want to log the result to the console, make sure to use a callback function such as this:

$scope.pages = Pages.query();
$scope.pages.$promise.then(function (response) {
  console.log(response);
});

Answer 4

Remember that $scope.pages is a promise object. If you want to log the result to the console, make sure to use a callback function such as this:

$scope.pages = Pages.query();
$scope.pages.$promise.then(function (response) {
  console.log(response);
});

Answer 5

Answer №3

Here is my recommendation for enhancing the service:

.factory('Pages', function($resource) {
    return {
       source: $resource("http://localhost:5432/api/pages",{},
                   { 
                      query: { 
                          method: "GET", 
                          isArray: false 
                      }
                    })
    }
})

Next, in the controller:

.controller('PagesCtrl', function($scope, Pages) {
    $scope.pages =  Pages.source.query();
    $scope.results = $scope.pages;
    console.log($scope.results);
})

It's important to note that the query method only returns an object because we specified to $resource that our query does not return an Array (it is false).

This implementation will only be successful if your Backend is correctly defined.

Answer 6

Here is my recommendation for enhancing the service:

.factory('Pages', function($resource) {
    return {
       source: $resource("http://localhost:5432/api/pages",{},
                   { 
                      query: { 
                          method: "GET", 
                          isArray: false 
                      }
                    })
    }
})

Next, in the controller:

.controller('PagesCtrl', function($scope, Pages) {
    $scope.pages =  Pages.source.query();
    $scope.results = $scope.pages;
    console.log($scope.results);
})

It's important to note that the query method only returns an object because we specified to $resource that our query does not return an Array (it is false).

This implementation will only be successful if your Backend is correctly defined.

What are the steps to utilizing an angular-js $resource?

Answer №1

Answer №2

Answer №3

Similar questions

Code timer for HTML redirection

Measuring the Size of Objects by Key Value

Retrieve the access ID from the conn.query result

Design a model class containing two arrow functions stored in variables with a default value

Implementing a delay for adding a class using jQuery

State initialization issue in a connected React app using Redux

Missing data: Node JS fails to recognize req.body

Change the visibility of a div element by leveraging the data-target attribute

Is there a newline and colon in the req.body from the post router?

Transmitting a large amount of information via POST or GET requests

Contrasting outcomes when tackling a problem in node.js versus python

React is giving me trouble as I try to map my tables. I am struggling to figure out how to do this

Issue encountered when utilizing html5/js Audio on Safari (Windows)

Retrieving information from two MongoDB collections (with filtering on _id) within a Meteor application

`Multiple confirmation modals appearing from delete button in vue-bootstrap`

Creating a customizable CSS selector in an Angular.js application

Attempting to showcase an OpenLayers Map using Vue3 and Nuxt framework

Is it possible to navigate between jQuery EditInPlace fields using the Tab key?

Tips for setting up data and transferring it to the test document

Employing the search feature to pinpoint a related value