Overview of Drupal's Ajax API.

This page is based on the "Ajax API" documentation. 

If you have been following this practical guide to building basic Drupal 8 modules from the beginning, we are now ready for some QA. If you just want to jump right in and play along you can grab the Lorum ipsum module directly from Drupal.

Let's check that the module works as expected by writing a few tests of our own.

Remember at the beginning of this tutorial when I said we'd define a block with a form? Well, now's the time to get right on it.

Everything's pretty neat so far, but how do we add some flexibility to our module? With some settings forms, of course.

loremipsum.module: hook_theme() implementation

/**
 * Implements hook_theme().
 */
function loremipsum_theme($existing, $type, $theme, $path) {
  $variables = array(
    'loremipsum' => array(
      'variables' => array(
        'source_text' => NULL,
      ),
      'template' => 'loremipsum',
    ),
  );
  return $variables;
}