Theming Forms (Form API Render Elements in Twig) | Drupal Twig Tutorial
Forms in Drupal are render arrays too -- built by Form API, then themed by the exact same template-suggestion and preprocess system used for nodes and blocks, right down to individual form elements.
In this Drupal 11 theming tutorial, you'll learn:
• Form alter hooks work identically whether implemented in a module OR a theme's .theme file -- themes get the exact same Form API hook system as modules do.
• #attributes on a render element is Form API's real mechanism for adding classes/data attributes -- Twig then reads these through the {{ attributes }} variable inside form-element.html.twig.
• form|without() at the end ensures every OTHER field (revision log, publishing options, etc.) still renders -- just grouped after the explicitly-placed ones, so nothing gets silently dropped.
• Overriding the GENERIC form-element.html.twig affects the wrapper markup around every single field on every form site-wide -- powerful, but also the most likely override to cause unexpected layout shifts elsewhere.
• form--{form_id}.html.twig (with hyphens replacing underscores) is the most specific suggestion -- exactly mirroring the node--{type}--{view-mode} pattern from earlier in this series.
• Same as every other theming change in this series -- new preprocess functions and new template files both require this rebuild before Drupal's discovery layer picks them up.
Try it yourself: Add a hook_form_FORM_ID_alter() in your sub-theme's .theme file that adds a description and a CSS class to one form field.
This is part 15/25 of our free Drupal 11 Frontend Theming tutorial series -- new lessons every week.
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