Implement D3 Example in Drupal 8

Drupal 8 is a new generation of Drupal. It is a digital experience platform that helps to reach your web content far and wide. Drupal helps every website owner to deliver the right content at the right time.

Drupal allows developers and marketers to overcome from restricted access and delays so they can create amazing experiences with their agile drupal developers. Being an open source software, Drupal produced by over a million users in 230 countries.

For millions of users and developers, we have presented tutorial that focuses on implementing the D3 example in Drupal 8 website. To implement any example of D3 JS library, please follow below steps to fulfill your requirement. We are providing you this tutorial with an example of the D3 live.

For instance, we need to implement the

For this module, we have to use json,css and js of D3 JS library.

Please review the following code structure by checking the picture.

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Please do check the above image. There are four main files which are available in module root folder:

1. : This file contain main project metadata
2. D3_viewport.routing.yml : This file contain routing url for access module content output.
3. D3_viewport.module : This file contain module hook so we have used drupal 8 theme hook for access template files.
4. D3_viewport.libraries.yml : This file contain js and css libraries for whole module

There are five different folders in module root folder:

1. Css : This folder contain css file for whole module.
2. Js : This folder contain js file for whole module.
3. Json : This folder contain json file for whole module.
4. Templates : This folder contain *.html.twig file for whole module. Basically, it is used for templating of drupal 8.

5.Src : This folder contains Controller for whole module.In this Src folder, one another folder includes Controller that contains controller file d3ModuleController.php.
a. Controller :
i. d3ModuleController.php : This file is basically use for main Controller of current module.

For managing the custom functionality of this module, We have used three Drupal 8 main class by calling there namespace.

1) Drupal\Core\Form\FormBase;

It will provide us a base class for forms. This class exists as a mid-point between dependency injection through ContainerInjectionInterface, as well as a less-structured use of traits which default to using the \Drupal accessor for service discovery. To properly inject this services, override create() and use the setters provided by the traits to inject the needed services.

public static function create($container) {
  $form = new static();
  // In this example we only need string translation so we use the
  // setStringTranslation() method provided by StringTranslationTrait.
  return $form;

Alternately, please do not use FormBase. A class can implement FormInterface, use the traits it needs, and inject services from the container as required.

2) Drupal\Core\Form\FormStateInterface;

It will provide an interface for an object containing the current state of a form. This is passed to all form related code so that the caller can use it to examine what in the form changed when the form submission process is complete. Furthermore, it may be used to store information related to the processed data in the form, which will persist across page requests when the ‘cache’ or ‘rebuild’ flag is set. Please do check the link \Drupal\Core\Form\FormState::$internalStorage for documentation of the available flags.

3) Drupal\Core\Url;

It will defines an object that holds information about a URL. This module has main view which is showing select option that is actually created by FormBase controller buildForm function Drupal\Core\Form\FormBase and Drupal\Core\Form\FormStateInterface. When User select any option from selection and submit the form on submit FormBase controller submitForm function call. (Drupal\Core\Form\FormBase and Drupal\Core\Form\FormStateInterface). On submit we have use


to redirect user to selected D3 view.

To view D3 selected view, we have used switch case for get parameter from url.
This switch case depend url parameter and call template and libraries by using ‘#theme’ and ‘#markup’ element of drupal 8. The element ‘#theme’ call templates of module by calling theme hook. In templates folder, *.html.twig files contain html and libraries. It can be attached from Twig templates via an attach_library() function. This all Different process renders the view of D3 JS.

Please do check the following URL for demo.

Getting confused? Don’t worry. Just drop comment/ feedback and our Drupal developers will provide you quick assistance.

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