Extending F2

At its core, F2 is an open framework. To create a truly open and flexible foundation with F2.js, F2 can be extended with custom plugins. Extending F2 with plugins provides direct access to F2.js SDK methods and can save your teams a lot of time.

Now that you’re comfortable with F2 and all the individual components of the framework, you are ready to extend F2 and add your own custom logic in the form of an F2 plugin.

There is a separate repository on GitHub dedicated to F2 plugin development. If you write a plugin you’d like to contribute back to the community, commit it to F2Plugins.

Download F2 Plugins View on GitHub

Plugins are encapsulated in JavaScript closures as demonstrated below. There are three arguments which can be passed into F2.extend(): namespace, object, and overwrite. For full details, read the F2.js SDK documentation.

F2.extend('YourPluginName', (function(){
    return {
        doSomething: function(){
            F2.log("Something has been done.");

To call your custom method shown above:


This method call writes Something has been done. to the Console.

The purpose of developing a plugin is to encapsulate clever logic in a single javascript function to save time and effort performing repetitive tasks. Here are some best practices to keep in mind:

  • Always use F2.extend() and wrap your plugin in a closure.
  • Follow the module pattern as shown in the example above or the f2-storage.js example on GitHub.
  • Adhere to F2’s guidelines when it comes to namespacing.
  • When passing options or data to the plugin, use data objects instead of n arguments. Cleanliness is key.
  • Don’t overuse or clutter the F2 namespace with more custom plugins than you need.

Have a question? Ask it on the F2 Google Group.