500px JavaScript SDK

The JavaScript SDK allows you to use the 500px API through browser-side JavaScript.

Click here to view a demo of the JavaScript SDK
View the source for the demo

Setup

Configuring Callback

In order to process cross-domain API requests through JavaScript you will need to upload a callback.html file to your site. The callback.html file must be hosted on the same domain and protocol as the page that will be using the API. For example if your application will be located at http://example.com/ then your callback can be located at http://example.com/callback.html. The filename and sub directory are not important so for example this would also work: http://example.com/500px_sdk/callback_file.html. If your callback is on a different protocol, domain or port number then you will not be able to process the cross-domain requests and the SDK will not work.

Once you have placed the callback file you will need to enter the URL of the callback file in your Application settings. To do this go to http://500px.com/settings/applications, create a new application or edit an existing one, and in the JavaScript SDK Callback field enter the URL to your callback.html file.

500px.js

The next step is to include the 500px.js file in your application. For example:

<script src="http://example.com/500px.js"></script>

Initialize the SDK

To initialize the SDK you will need your SDK key. This can be found on http://500px.com/settings/applications. Click the See application details link for your application and copy the value given for JavaScript SDK Key. In your application use the init method to initialize the SDK:

<script>
  _500px.init({
    sdk_key: 'YOUR_SDK_KEY'
  });
</script>

If you're using jQuery (or a similar framework) you might want to wait until the page is loaded:

<script>
  $(document).ready(function () {
    _500px.init({
      sdk_key: 'YOUR_SDK_KEY'
    });
  });
</script>

Using the SDK

Making API Calls

To make an API call use the api function.

_500px.api('/photos', { feature: 'popular', page: 1 }, function (response) {
    console.log(response.data.photos);
});

To see a list of available API calls, the parameters they take and what they return see the API Documentation.

The Response Object

Calls to api return a Response object. The response object has these properties:

• success (boolean) True if no errors occurred.
• error (boolean) True if an error occurred.
• error_message (string) If an error occurred, this value will have the error message.
• status (integer) The HTTP status code of the response.
• data (object) The data returned by the API call.

Examples:

_500px.api('/photos', {feature: 'popular', page: 1}, function (response) {
    if (response.success) {
        alert('There are ' + response.data.photos.length + ' photos.');
    } else {
        alert('Unable to complete request: ' + response.status + ' - ' + response.error_message);
    }
});

This example sends a PUT request to update a photo:

_500px.api('/photos/8888888', 'put', {name: 'New Photo Name'}, function (response) {
   if (response.success) {
    alert('You photo was updated.')
   } 
});

Logging a user in

Certain API calls do not require a user to approve your application (for example getting a list of popular photos). In the API Documentation these calls are labelled as requiring only a consumer key. For calls that require an Access Token you will need to authenticate the user first. To authenticate a user use the login method. If you pass it a callback function it will be called with the status of the login. The status can have two values:

• authorized The user authorized your app. You now have an Access Token for this user.
• denied The user denied your application. You do not have an Access Token for this user.

_500px.login(function (status) {
    if (status == 'authorized') {
        alert('You have logged in');
        _500px.api('/users', function (response) {
            // .......
        });
    } else {
        alert('You denied my application');
    }
});

getAuthorizationStatus

Each time you call login a popup window is opened where the user can login and authorize your application. If the user has already logged in and authorized your app then calling login will open the popup, and the popup will close again immediately. This is because 500px will not require a user to re-authorize an application. To avoid the popup opening unnecessarily you can use the getAuthorizationStatus method to check if the user needs to login.

getAuthorizationStatus can be passed a callback that will be given a string with the status of the user's sessions. The value of the status can be:

• not_logged_in The user is not logged in. You should call login to log the user in.
• not_authorized The user is logged in but has not authorized your application. You should call login so the user can authorize it.
• authorized The user has authorized your application. An access token has been obtained for the user.

Example:

_500px.getAuthorizationStatus(function (status) {
    if (status == 'not_logged_in' || status == 'not_authorized') {
        _500px.login();
    }
});

ensureAuthorization

ensureAuthorization will check if a user has authorized your application, and prompt them to login/authorize it if they haven't. It can be passed a callback function that will be called if/when the user has authorized your application. If an access token has already been obtained for the user using login or getAuthorizationStatus the callback will be executed immediately.

Example:

_500px.ensureAuthorization(function () {
    _500px.api('/users', function (response) {
        alert("Your username is " + response.user.username);
    });
});

Events

There are three events that can be subscribed to:

• authorization_obtained Triggered when an Access Token is obtained for the user. login, getAuthorizationStatus and ensureAuthorization will trigger this event when they obtain an access token for a user.
• authorization_denied Triggered when the user is prompted to authorize your application and declines to grant authorization.
• logout Triggered when the user logs out, or if there is an OAuth error (for example the Access Token you have is no longer valid).

Subscribing to events

Use the on function to subscribe to an event.

_500px.on('authorization_obtained', function () {
    alert('You have logged in');
});