Theming

Member type cards

The Registration form's member type selector renders through two templates:

Template	Renders
templates/member-type-cards.html.twig	The radiogroup wrapper (title, container, error message)
templates/member-type-card.html.twig	One card (name, price, description, selected/disabled state)

This plural-wraps-singular split matches Drupal core's own convention for the same relationship, e.g. menu-local-tasks.html.twig / menu-local-task.html.twig and views-view-fields.html.twig / views-view-field.html.twig.

ConregThemeHooks::preprocessMemberTypeCards() (src/Hook/ConregThemeHooks.php, see docs/development/hooks.md) builds each card as a themeable render array with a per-type suggestion:

'#theme' => ['member_type_card__' . $suggestion, 'member_type_card'],

$suggestion is the member type's code, lowercased with non-alphanumeric characters collapsed to _ (e.g. type code A → suggestion a).

Overriding one type's card

To style a specific membership type differently, add member-type-card--{suggestion}.html.twig (e.g. member-type-card--a.html.twig for type code A) to your theme's templates/ directory. Drupal discovers it automatically — no extra registration needed, the same as any other hook_theme_suggestions_alter()-style override.

This only works from a theme, not a module. Drupal's template-suggestion discovery (TwigThemeEngine::theme() → drupal_find_theme_templates()) only scans the active theme's (and base themes') templates/ directory — a module that ships a template file with no hook_theme() of its own is never scanned, even if the filename matches the suggestion pattern exactly. A module can still provide an override, but only by implementing hook_theme_suggestions_member_type_card_alter() itself, not by dropping a file in and hoping it's picked up.

Day options

When a selected member type has per-day pricing, the day-pricing checkboxes rendered inside its card (see #day_options above) follow the same plural-wraps-singular split:

Template	Renders
templates/member-day-options.html.twig	The group wrapper (title, container, error message)
templates/member-day-option.html.twig	One day (checkbox, price, description)

Each day renders as [ ] {price} {description} — e.g. [ ] €25 Saturday — where the description is the admin-entered text from the day's configuration and the price comes from that day's configured price ("Free" for a zero price, omitted entirely if the day has no price data).

ConregThemeHooks::preprocessMemberDayOptions() (src/Hook/ConregThemeHooks.php) builds each day as a themeable render array with a per-day suggestion, using the same suggestion algorithm as the member type cards above:

'#theme' => ['member_day_option__' . $suggestion, 'member_day_option'],

Overriding one day's option

To style a specific day differently, add member-day-option--{suggestion}.html.twig (e.g. member-day-option--fr.html.twig for day code Fr) to your theme's templates/ directory — same mechanism, and the same theme-only caveat, as overriding one type's card above.