#Drupal 8 module development how to
#Drupal 8 module development series

The place in the array where that very dynamic content would appear is first assigned a placeholder. This works by using #lazy_builder callbacks to lazy load certain very dynamic subtrees of a render array.

The Render API is capable of detecting poorly-cacheable (highly dynamic) parts of a page and rendering them later using a process called auto-placeholdering.

#Drupal 8 module development how to

Demonstrate how to use the #tableselect and #tabledrag options to create complex form widgetsīy the end of this tutorial you should be able to create HTML tables in all their various permutations as part of a render array.

Provide definitions for all the various properties that can be used to define a table element.

Look at outputting simple strings as a table.

Whether you just want to display a set of tabular data, or you provide your users with a complex form element for reordering and nesting items inside a menu tree, it can all be done with the #table element. In addition, when used in the context of a form, tables can be made into a multiple select widget, or have drag-and-drop reordering of rows enabled. Data to be displayed in the table can be an array of simple string values, or an array of render arrays where each sub element is a row with columns as child elements. It supports all the features of a standard HTML element like headers, captions, and column groups. The #table render element type is a powerful way to output an array of rows and columns as an HTML table. We'll continue to fill this collection out as we develop more tutorials for these critical components. You might also want to explore our guide for Drupal module developers: Develop Drupal Sites. We recommend working through tutorials in this collection on an as-needed basis.

Working with services, dependency injection, and the service container.

Using the Render API to present content for display.

Altering and extending Drupal without hacking core through plugins, hooks, and events.

Note: If you're using Drupal 7, see Module Development for Drupal 7 or search using the Drupal 7 filter. The various APIs and subsystems outlined below are critical systems and in most cases you'll need to know how some or all of these work in order to make use of Drupal's higher level developer APIs.

#Drupal 8 module development series

This series is a collection of all of our Drupal Module Development tutorials - essential information for anyone developing Drupal modules or working on Drupal core.