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zotonic-template-creation

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Use when creating, refactoring, or reviewing Zotonic template_compiler templates in priv/templates, including page/base templates, partials, category-specific templates, catinclude/catcompose usage, translations, template inheritance, template filters, scomps, and standard html/body/head setup for Zotonic sites and modules.

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name	zotonic-template-creation
description	Use when creating, refactoring, or reviewing Zotonic template_compiler templates in priv/templates, including page/base templates, partials, category-specific templates, catinclude/catcompose usage, translations, template inheritance, template filters, scomps, and standard html/body/head setup for Zotonic sites and modules.

Zotonic Template Creation

First Pass

Inspect nearby templates before editing. Preserve local structure, blocks, naming, and CSS class conventions.
Put templates under the app or site priv/templates directory.
Use Zotonic template_compiler syntax, which is Django-like but has Zotonic-specific tags, models, scomps, category-aware includes, and runtime compilation.
Use semantic HTML and accessible attributes; avoid inline styles unless the value is truly dynamic.

Security

Treat template output as HTML unless proven otherwise. Escape data at trust boundaries.
Properties from the m.rsc model are generally sanitized/pre-escaped and safe to render directly, for example {{ id.title }} or {{ m.rsc[id].summary }}.
Do not assume all m.rsc values are safe: properties explicitly marked or documented as unsafe, such as names ending in _unsafe, must be escaped or sanitized before output.
Output from other models must be escaped when rendered into templates unless that model explicitly documents the returned value as safe HTML. This includes request, identity, EXIF, medium metadata, and custom model output.
Access query and request arguments with q, for example {{ q.qs|escape }}. Values from q always come from outside and must be considered unsafe.
Values from q can be anything accepted by request/API handling, including strings, booleans, structured maps/lists, or upload records such as #upload{}; never bind an unsafe q value to a trusted variable name such as id.
When a query id is needed as a resource, sanitize through the resource model: prefer {% with m.rsc[q.id].id as id %} over {% with q.id as id %}.
Follow the Zotonic XSS guidance in https://zotonic.com/cookbook/2325/security-templates-and-xss-prevention: escape q.*, use sanitized controller/resource ids directly, and keep untrusted variables visibly named as untrusted, for example qid.

Template Layout

Make site page templates extend a common base, usually {% extends "base.tpl" %} or {% extends "page.tpl" %}.
If a template uses {% extends %} or {% overrules %}, make that the first template tag. The template should then contain block overrides, not arbitrary top-level page markup.
extends, overrules, inherit, compose, catcompose, use, and useblock accept extra arguments; the optional with keyword is accepted for compatibility.
Use {% inherit %} inside an overridden block to render the inherited block body, optionally with extra variables.
Use {% compose %}/{% catcompose %} when the caller needs to include a template and override named blocks inside it.
Use fragments with {% fragment %}, {% use %}, and {% useblock %} for reusable pieces inside an inheritance tree.

Base Templates

A normal site base should include language, environment, Cotonic, module head/body hooks, JS collection, and script flush support.
Put language on <html> using z_language, for example lang="{{ z_language|default:"en"|escape }}"; include xml:lang when the local site pattern does.
Add an environment class on <html>: class="environment-{{ m.site.environment }}" or include it alongside other root classes.
Include {% all include "_html_head.tpl" %} in <head> so modules can add Cotonic setup, SEO, theme initialization, feeds, and other head fragments.
Include {% all include "_html_body.tpl" %} near the end of <body> so modules can add required body fragments.
Include {% include "_js_include.tpl" %} when the site has a JS include partial.
End the body with {% script %} so collected {% javascript %}, {% wire %}, and related scomp output is emitted.
Add data-cotonic-pathname-search="{% cotonic_pathname_search %}" to <body> for Cotonic UI components.
Use body classes like page-{{ id.name }} and cat-{{ cat }} for the current resource and its categories.
Add {% block html_attr %}, {% block body_class %}, and {% block body_attrs %} or the local equivalents so pages can add attributes.
For admin-like bases, follow admin_base.tpl: use _language_attrs.tpl, zotonic-admin, _html_head_admin.tpl, _html_body_admin.tpl, data-cotonic-pathname-search, admin JS includes, and {% script %}.

Includes And Subfolders

Prefix partial template names with _ when they are not directly routed pages.
Use subfolders to group related partials in larger sites, following patterns such as cards/, header/, nav/, footer/, search/, page/, page-actions/, edit/, icons/, email/, pivot/, or feature-specific folders.
Keep path and category naming together for category-aware partials, for example cards/card.tpl, cards/card.event.tpl, header/header.tpl, header/header.name.page_art_agenda.tpl, page/content-left.tpl, page/content-left.person.tpl.
Use {% include "partial.tpl" arg=value %} for a single known partial.
Use {% optional include "partial.tpl" %} when the partial can be absent.
Use {% all include "_html_head.tpl" %} or {% all include "_admin_overview_filter_panel.tpl" %} when all modules should contribute same-named templates in module priority order.
Use include cache arguments (max_age, vary, sudo, anondo, runtime) only when needed; be explicit because they affect ACL/runtime behavior.

Category Templates

Use category-specific template filenames for resources and partials: page.event.tpl, page.name.page_home.tpl, _admin_edit_content.person.tpl, cards/card.artwork.tpl.
Use {% catinclude "base.tpl" id %} when a resource category or unique resource name should choose the template.
For a resource named my_page_name in category news under article under text, {% catinclude "hello.tpl" id %} searches hello.name.my_page_name.tpl, hello.news.tpl, hello.article.tpl, hello.text.tpl, then hello.tpl.
When passing category names instead of a resource, put the most specific category last: {% catinclude "hello.tpl" [`text`, `article`] %} searches hello.article.tpl, then hello.text.tpl, then hello.tpl.
Category names are mixed into the full basename before .tpl, preserving subfolders and prefixes. catinclude "cards/card.tpl" event_id looks for cards/card.name.NAME.tpl, cards/card.event.tpl, and cards/card.tpl.
Use {% all catinclude "partial.tpl" id %} when all matching category templates from all modules must render, as in admin edit panels.
Prefer catinclude/catcompose over large if id.is_a... switches when category-specific rendering is intended.

Translations

Keep template source strings in English.
Wrap user-facing static text in {_ Text _}.
Use {% trans "Hello {name}" name=id.title %} for translated strings with variable substitution.
For translated tag/scomp/include arguments, use compiler-native translated literals: text=_"Save", title=_"Save this page.", or headline=_"Latest modified opportunities".
In HTML attributes, embed normal translation tags, for example placeholder="{_ Search _}".
Use z_language for the current language. For language-specific resource URLs, use {{ id.page_url with z_language = code }}.
Translation strings are extracted to POT files under priv/translations/template/, for example priv/translations/template/sitename.pot.
Do not regenerate or commit POT files during normal feature work. POT files are generated on the master branch with bin/zotonic pot zotonic; if a feature/test command creates POT diffs, restore or leave them out unless the user explicitly asks to update POT files.
Never update Zotonic core .po files directly; they are managed through Crowdin at crowdin.com.
Merge site/user-module PO files with msgmerge --backup=none --update priv/translations/nl.po priv/translations/template/sitename.pot and validate with msgfmt --check --output-file=/dev/null priv/translations/nl.po.
Use _translations.tpl for strings that must be extracted but are not otherwise visible in templates.

Tags And Filters

Read tag documentation in doc/template-tags/ when using unfamiliar tags. Important files include extends.md, overrules.md, include.md, all_include.md, catinclude.md, all_catinclude.md, compose.md, catcompose.md, fragment.md, use.md, useblock.md, inherit.md, trans.md, trans_ext.md, url.md, lib.md, image.md, and media.md.
Built-in tags handled by Zotonic/template_compiler include control and inheritance tags such as for, if, block, extends, overrules, include, catinclude, all include, comment, with, cache, filter, spaceless, javascript, and trans.
Zotonic runtime built-in tags include url, lib, lib_url, image, image_url, image_data_url, and media.
Unknown non-built-in tags are custom Zotonic scomps. Find them under src/scomps/ as scomp_<module>_<tag>.erl; examples include cotonic_pathname_search, wire, button, pager, menu, and live depending on enabled modules.
Template filters are Erlang modules under src/filters/ named filter_name.erl. The template filter {{ value|summary:120 }} maps to filter_summary:summary(Value, 120, Context).
Check apps/zotonic_mod_base/src/filters/ first for core filters, then app/module src/filters/ directories for module-specific filters.
Filters should have a -moduledoc in their src/filters/filter_*.erl source file; use that source documentation as the reference.
default, default_if_none, and default_if_undefined are inlined by template_compiler; many other filters call filter_<name> modules.
Use escaping filters such as escape, escapejs, escapejson, sanitize_html, sanitize_url, and urlencode at trust boundaries.

Scomps

Scomps are screen components: server-side template tags that render HTML, JavaScript, or wire actions from Erlang.

Use scomps as normal template tags, for example:

{% button text=_"Save" action={submit} %}
{% wire id="form" type="submit" postback={save id=id} %}
{% pager result=result dispatch="page" %}
{% menu id=`main_menu` %}

Unknown non-built-in tags are usually scomps. Find their implementation under src/scomps/ as scomp_<module>_<tag>.erl.
Scomps should have a -moduledoc that documents accepted arguments, generated markup, emitted JavaScript, postbacks, and security assumptions.
Prefer existing scomps for common Zotonic behavior such as buttons, wires, validation, live updates, sortable lists, menus, tabs, pagers, and Cotonic integration.
Keep scomp arguments explicit and translated where user-facing, for example text=_"Delete" and title=_"Delete this page.".
If a scomp collects JavaScript or wires, ensure the base template ends with {% script %}.

Forms

Use normal HTML forms and wire them with Zotonic when the result should be handled by Erlang: {% wire id="contact-form" type="submit" postback={contact []} delegate=`mod_contact` %}.
Forms that submit by postback normally use method="post" action="postback" and have a stable id.
Use {% button %} or action {submit} when the local template pattern uses Zotonic buttons instead of raw submit buttons.
In the receiving event(#submit{}, Context), fetch fields with z_context:get_q/2, z_context:get_q_all/1, or z_context:get_q_validated/2; never trust client-side validation alone.
Use z_context:get_q_all_noz/1 or z_context:get_q_map_noz/1 when processing ordinary form fields and excluding Zotonic internal parameters.
Add validation with {% validate %} next to the field being validated. The validation tag emits LiveValidation JavaScript and also enables server-side validation for submit/postback handling.

{% wire id="contact-form" type="submit" postback={contact []} delegate=`mod_contact` %}
<form id="contact-form" method="post" action="postback">
    <input id="mail" name="mail" type="email">
    {% validate id="mail" type={presence} type={email} %}

    <textarea id="message" name="message"></textarea>
    {% validate id="message" type={presence failure_message=_"Please enter a message."} %}

    <button type="submit">{_ Send _}</button>
</form>

The id argument of {% validate %} is the input element id. Use name="field_name" when the submitted field name differs from the element id.
Multiple type={...} arguments can be used on the same field, for example type={presence} type={email}.
Common validation options include failure_message, valid_message, message_after, only_on_blur, only_on_submit, wait, trigger, and target.
Use generated ids such as id=#email name="email" when a partial can be rendered multiple times on one page.
File inputs can use the presence validator; submitted uploads arrive as #upload{} values.
Include _js_include.tpl/admin JS includes and end the page with {% script %} so LiveValidation, validators, wires, and form postbacks are initialized.

Validators

Template validators are implemented by Erlang modules in src/validators/ named validator_<module>_<name>.erl.
Validator type names in templates map to those modules. {% validate id="email" type={email} %} resolves to validator_base_email; module-specific validators include examples such as validator_admin_identity_username_unique.
Core validators are in apps/zotonic_mod_base/src/validators/; inspect their -moduledoc before using unfamiliar arguments.
Common core validators include presence, email, length, numericality, format, date, json, acceptance, confirmation, postback, name_unique, and page_path_unique.
Validators generally implement render_validator/5 for client-side LiveValidation setup and validate/5 for server-side checks.
A validator can return extra validation args from render_validator/5; those args are passed to validate/5 during server validation.
The postback validator performs custom server-side validation through a notification or delegate; use it for checks that need database lookups, ACL checks, or external state.

<input id="username" name="username" type="text">
{% validate id="username" wait=400
            type={presence}
            type={postback event="validate_username"} %}

For a custom validator, add src/validators/validator_mymodule_slug.erl, export render_validator/5 and validate/5, include zotonic.hrl, and document all template arguments in -moduledoc.
Client-side LiveValidation is for responsiveness; all security and data integrity checks must also happen server-side in the validator, event/2, model, or controller.

Source Documentation

Filters, scomps, validators, models, and modules should always include a -moduledoc in their Erlang source file.
Use those -moduledoc entries as the authoritative local documentation for template-facing behavior.
Do not rely on doc/_build; it was generated by older documentation systems and is not expected to exist.

Models

Access template models through m, using the model name without the m_ prefix: m.rsc, m.search, m.req, m.acl, m.config, m.category, m.media, m.edge, and module-specific models.
Model paths use dot/index notation. Examples: {{ m.rsc[id].title }}, {{ m.acl.user }}, {{ m.req.host|escape }}, {{ m.config.site.title.value }}.
Use the shorthand id.title, id.summary, id.o.haspart, and id.s.author only when id is the sanitized page resource or came from m.rsc.
Use search models for resource lists and prefer the :: payload operator for new search calls: {% for id in m.search.query::%{ cat: ["news"], pagelen: 10 } %}.
Use {% with %} to avoid repeating expensive model lookups, especially searches: {% with m.search.query::%{ cat: ["news"], pagelen: 10 } as latest_news %}.
Models are implemented in src/models/ as m_name.erl modules with the zotonic_model behaviour. Core models live in apps/zotonic_core/src/models/; module models live in each module's src/models/.
Models should have a -moduledoc in their src/models/m_*.erl source file; use that source documentation as the reference. The old doc/_build generated docs are an obsolete artifact and should not be relied on.
Before using output from a less familiar model, read its source documentation and check whether it performs ACL checks and whether returned values are safe for direct HTML output.

Model Payloads

Use the :: operator to pass a structured payload to a model call. The expression after :: is passed as the model payload instead of being part of the path.
Prefer maps for payloads: m.search.query::%{ cat: ["article"], is_published: true, sort: ["-created"], pagelen: 20, page: q.page }.
The path before :: still selects the model and operation. In m.search.paged.query::%{ text: q.qs }, the path is [paged, query] and the payload is the map.
For the search model, prefer :: over the older tuple/list query syntax. It is clearer, easier to extend, and matches model API payload handling.
Older tuple-style search syntax, such as m.search[{latest cat="text" pagelen=10}], is still encountered in existing templates and docs but should not be copied for new code.
Use tuple-style only when maintaining existing code that depends on the deprecated search representation or when the target model explicitly documents tuple input.
Treat payload values from q as unsafe. A structured payload can safely pass q.page to the model for validation, but never render q.* directly without escaping.

Resource And URL Patterns

Prefer {{ id.title }}, {{ id.summary }}, {{ id.body }}, and {{ id.depiction }} when id is the sanitized page resource.
Use m.rsc[unsafe_id] when the resource id comes from an untrusted source; Zotonic will sanitize through the model.
Use {{ m.rsc.unique_name.page_url }} for named page resources.
Use {% url dispatch_name id=id %} for dispatch/controller URLs.
Do not hard-code internal URLs when a dispatch rule or resource page_url exists.
Use {% image id mediaclass="..." alt=id.title %} or {% media id %} for media; define image sizes in priv/templates/mediaclass.config.

CSS And Bootstrap

Put source styles in priv/lib-src/ and generated browser assets in priv/lib/; templates should include generated CSS with {% lib "css/file.css" %} or module/site include templates.
Do not edit generated CSS in priv/lib/ when a matching SCSS/LESS source exists. Edit the source file and rerun the relevant Makefile.
Use the local build pattern. Most style builds are run from the source directory, for example make -C apps/zotonic_mod_bootstrap/priv/lib-src, make -C apps/zotonic_mod_bootstrap/priv/lib-src/bootstrap, make -C apps/zotonic_mod_admin/priv/lib-src/admin-bootstrap5, or make -C apps_user/zotonicwww2/priv/lib-src.
SCSS builds use Dart Sass via the sass command; older icon/base styles may still use lessc. If a Makefile defines SASS ?= sass, override it with make SASS=/path/to/sass only when needed.
zotonic_mod_bootstrap keeps Bootstrap sources under priv/lib-src/bootstrap/scss and Bootstrap 3 compatibility shims under priv/lib-src/bootstrap/compat. Its build emits priv/lib/bootstrap/css/bootstrap.css (Bootstrap 5 plus Bootstrap 3 compat), bootstrap5.css (Bootstrap 5 without compat), bootstrap3-compat.css (compat only), theme CSS, and minified variants.
Use bootstrap.css when existing templates still use Bootstrap 3 class names and need the compatibility layer. Use bootstrap5.css only when templates are written for Bootstrap 5 classes or when a site includes compatibility separately.
The admin has separate Bootstrap builds: priv/lib-src/admin-bootstrap3 is kept for old Bootstrap 3 output, and priv/lib-src/admin-bootstrap5 builds priv/lib/css/admin-bootstrap5.css and .min.css with Bootstrap 5, admin overrides, and the admin Bootstrap 3 compatibility file.
Admin theme and component styles live in apps/zotonic_mod_admin/priv/lib-src/zotonic-admin/scss; prefer CSS custom properties from _theme.scss/_variables.scss for colors so light/dark themes keep working.
Bootstrap 3 compatibility files should stay in separate compat/ directories. Keep them SCSS-friendly with variables and nested selectors where that improves maintainability.
When adding or changing template classes, first check whether the project is relying on Bootstrap 3 compatibility. Avoid changing large template class sets just to satisfy Bootstrap 5 if compat CSS is intended to preserve them.
For dark/light theme support, prefer existing CSS variables and add new variables near the theme files rather than hard-coded colors in component partials.
After SCSS/LESS edits, rerun the relevant Makefile and verify both normal and .min.css outputs if the build produces minified files.

Cotonic

Cotonic is Zotonic's browser-side JavaScript runtime for isolated components, workers, and MQTT-style publish/subscribe messaging.
Cotonic exposes cotonic on the page, including cotonic.ready, cotonic.broker.publish, cotonic.broker.subscribe, cotonic.broker.call, cotonic.spawn, cotonic.spawn_named, and MQTT helpers such as cotonic.mqtt.matches, fill, and extract.
Cotonic topics are slash-separated MQTT-style topics. Use + and # wildcards in subscriptions; named wildcards such as +id can be extracted by Cotonic helpers.
Zotonic bridges the browser broker to the server over the origin MQTT bridge. Server topics are commonly addressed with bridge/origin/..., for example bridge/origin/model/rsc/event/{{ id }}/delete.
Include Cotonic through Zotonic's standard head/JS includes. Do not hand-roll the low-level bridge setup unless working on mod_base itself.
Ensure the base template includes {% all include "_html_head.tpl" %} or _html_head_admin.tpl; these include Cotonic head setup such as _html_head_cotonic.tpl.
Ensure the JS includes load cotonic/cotonic.js and the Zotonic wired app when the site uses declarative data attributes or wires.
Add data-cotonic-pathname-search="{% cotonic_pathname_search %}" to <body>; Zotonic's wired JS warns when it is missing and Cotonic UI/location handling depends on it.
Use cotonic.ready.then(function() { ... }) before calling Cotonic APIs from inline page JavaScript that must run after initialization.

Cotonic Data Attributes

Prefer Cotonic data attributes for simple declarative behavior instead of ad-hoc JavaScript event handlers.
Use data-onclick-topic="topic", data-onsubmit-topic="topic", and data-oninput-topic="topic" to publish DOM events to Cotonic topics. Example: <a href="#back" data-onclick-topic="model/location/post/redirect/back">.
For live search/filter forms, use data-onsubmit-topic="model/location/post/qlist/submit" and data-oninput-topic="model/location/post/qlist/submit" on a GET form.
Event data attributes normally prevent default behavior and stop propagation. Use data-onclick-cancel, data-onsubmit-cancel, or data-oninput-cancel when local behavior needs different cancellation semantics.
Use Cotonic location model topics for URL behavior: model/location/post/redirect/back, model/location/post/qlist/submit, model/location/post/push, model/location/post/replace, and their silent variants when appropriate.
Use storage topics instead of direct storage access when cooperating with Cotonic components: model/localStorage/get/+key, model/localStorage/post/+key, model/sessionStorage/get/+key, and matching event/+key topics.
Use UI topics such as model/ui/insert/+key, model/ui/update/+key, model/ui/delete/+key, and model/ui/event/dom-updated/+key for DOM updates managed by Cotonic UI code.
Escape any template values placed inside data attributes, especially topic fragments or payload-like values that include q.* or non-resource model output.
Keep data attributes readable and topic-oriented; if a behavior needs complex state, use a scomp, a Cotonic model, or a dedicated JavaScript module.

JavaScript And Interactivity

Put inline template-collected JavaScript inside {% javascript %}...{% endjavascript %} and ensure the base has {% script %}.
Use Zotonic declarative behavior ({% wire %}, scomps, Cotonic widgets, do_* classes) when nearby templates use it.
Include Cotonic assets through the site _js_include.tpl and module head/body hooks, not by duplicating low-level bridge snippets.

name	zotonic-template-creation
description	Use when creating, refactoring, or reviewing Zotonic template_compiler templates in priv/templates, including page/base templates, partials, category-specific templates, catinclude/catcompose usage, translations, template inheritance, template filters, scomps, and standard html/body/head setup for Zotonic sites and modules.

Zotonic Template Creation

First Pass

Inspect nearby templates before editing. Preserve local structure, blocks, naming, and CSS class conventions.
Put templates under the app or site priv/templates directory.
Use Zotonic template_compiler syntax, which is Django-like but has Zotonic-specific tags, models, scomps, category-aware includes, and runtime compilation.
Use semantic HTML and accessible attributes; avoid inline styles unless the value is truly dynamic.

Security

Treat template output as HTML unless proven otherwise. Escape data at trust boundaries.
Properties from the m.rsc model are generally sanitized/pre-escaped and safe to render directly, for example {{ id.title }} or {{ m.rsc[id].summary }}.
Do not assume all m.rsc values are safe: properties explicitly marked or documented as unsafe, such as names ending in _unsafe, must be escaped or sanitized before output.
Output from other models must be escaped when rendered into templates unless that model explicitly documents the returned value as safe HTML. This includes request, identity, EXIF, medium metadata, and custom model output.
Access query and request arguments with q, for example {{ q.qs|escape }}. Values from q always come from outside and must be considered unsafe.
Values from q can be anything accepted by request/API handling, including strings, booleans, structured maps/lists, or upload records such as #upload{}; never bind an unsafe q value to a trusted variable name such as id.
When a query id is needed as a resource, sanitize through the resource model: prefer {% with m.rsc[q.id].id as id %} over {% with q.id as id %}.
Follow the Zotonic XSS guidance in https://zotonic.com/cookbook/2325/security-templates-and-xss-prevention: escape q.*, use sanitized controller/resource ids directly, and keep untrusted variables visibly named as untrusted, for example qid.

Template Layout

Make site page templates extend a common base, usually {% extends "base.tpl" %} or {% extends "page.tpl" %}.
If a template uses {% extends %} or {% overrules %}, make that the first template tag. The template should then contain block overrides, not arbitrary top-level page markup.
extends, overrules, inherit, compose, catcompose, use, and useblock accept extra arguments; the optional with keyword is accepted for compatibility.
Use {% inherit %} inside an overridden block to render the inherited block body, optionally with extra variables.
Use {% compose %}/{% catcompose %} when the caller needs to include a template and override named blocks inside it.
Use fragments with {% fragment %}, {% use %}, and {% useblock %} for reusable pieces inside an inheritance tree.

Base Templates

A normal site base should include language, environment, Cotonic, module head/body hooks, JS collection, and script flush support.
Put language on <html> using z_language, for example lang="{{ z_language|default:"en"|escape }}"; include xml:lang when the local site pattern does.
Add an environment class on <html>: class="environment-{{ m.site.environment }}" or include it alongside other root classes.
Include {% all include "_html_head.tpl" %} in <head> so modules can add Cotonic setup, SEO, theme initialization, feeds, and other head fragments.
Include {% all include "_html_body.tpl" %} near the end of <body> so modules can add required body fragments.
Include {% include "_js_include.tpl" %} when the site has a JS include partial.
End the body with {% script %} so collected {% javascript %}, {% wire %}, and related scomp output is emitted.
Add data-cotonic-pathname-search="{% cotonic_pathname_search %}" to <body> for Cotonic UI components.
Use body classes like page-{{ id.name }} and cat-{{ cat }} for the current resource and its categories.
Add {% block html_attr %}, {% block body_class %}, and {% block body_attrs %} or the local equivalents so pages can add attributes.
For admin-like bases, follow admin_base.tpl: use _language_attrs.tpl, zotonic-admin, _html_head_admin.tpl, _html_body_admin.tpl, data-cotonic-pathname-search, admin JS includes, and {% script %}.

Includes And Subfolders

Prefix partial template names with _ when they are not directly routed pages.
Use subfolders to group related partials in larger sites, following patterns such as cards/, header/, nav/, footer/, search/, page/, page-actions/, edit/, icons/, email/, pivot/, or feature-specific folders.
Keep path and category naming together for category-aware partials, for example cards/card.tpl, cards/card.event.tpl, header/header.tpl, header/header.name.page_art_agenda.tpl, page/content-left.tpl, page/content-left.person.tpl.
Use {% include "partial.tpl" arg=value %} for a single known partial.
Use {% optional include "partial.tpl" %} when the partial can be absent.
Use {% all include "_html_head.tpl" %} or {% all include "_admin_overview_filter_panel.tpl" %} when all modules should contribute same-named templates in module priority order.
Use include cache arguments (max_age, vary, sudo, anondo, runtime) only when needed; be explicit because they affect ACL/runtime behavior.

Category Templates

Use category-specific template filenames for resources and partials: page.event.tpl, page.name.page_home.tpl, _admin_edit_content.person.tpl, cards/card.artwork.tpl.
Use {% catinclude "base.tpl" id %} when a resource category or unique resource name should choose the template.
For a resource named my_page_name in category news under article under text, {% catinclude "hello.tpl" id %} searches hello.name.my_page_name.tpl, hello.news.tpl, hello.article.tpl, hello.text.tpl, then hello.tpl.
When passing category names instead of a resource, put the most specific category last: {% catinclude "hello.tpl" [`text`, `article`] %} searches hello.article.tpl, then hello.text.tpl, then hello.tpl.
Category names are mixed into the full basename before .tpl, preserving subfolders and prefixes. catinclude "cards/card.tpl" event_id looks for cards/card.name.NAME.tpl, cards/card.event.tpl, and cards/card.tpl.
Use {% all catinclude "partial.tpl" id %} when all matching category templates from all modules must render, as in admin edit panels.
Prefer catinclude/catcompose over large if id.is_a... switches when category-specific rendering is intended.

Translations

Keep template source strings in English.
Wrap user-facing static text in {_ Text _}.
Use {% trans "Hello {name}" name=id.title %} for translated strings with variable substitution.
For translated tag/scomp/include arguments, use compiler-native translated literals: text=_"Save", title=_"Save this page.", or headline=_"Latest modified opportunities".
In HTML attributes, embed normal translation tags, for example placeholder="{_ Search _}".
Use z_language for the current language. For language-specific resource URLs, use {{ id.page_url with z_language = code }}.
Translation strings are extracted to POT files under priv/translations/template/, for example priv/translations/template/sitename.pot.
Do not regenerate or commit POT files during normal feature work. POT files are generated on the master branch with bin/zotonic pot zotonic; if a feature/test command creates POT diffs, restore or leave them out unless the user explicitly asks to update POT files.
Never update Zotonic core .po files directly; they are managed through Crowdin at crowdin.com.
Merge site/user-module PO files with msgmerge --backup=none --update priv/translations/nl.po priv/translations/template/sitename.pot and validate with msgfmt --check --output-file=/dev/null priv/translations/nl.po.
Use _translations.tpl for strings that must be extracted but are not otherwise visible in templates.

Tags And Filters

Read tag documentation in doc/template-tags/ when using unfamiliar tags. Important files include extends.md, overrules.md, include.md, all_include.md, catinclude.md, all_catinclude.md, compose.md, catcompose.md, fragment.md, use.md, useblock.md, inherit.md, trans.md, trans_ext.md, url.md, lib.md, image.md, and media.md.
Built-in tags handled by Zotonic/template_compiler include control and inheritance tags such as for, if, block, extends, overrules, include, catinclude, all include, comment, with, cache, filter, spaceless, javascript, and trans.
Zotonic runtime built-in tags include url, lib, lib_url, image, image_url, image_data_url, and media.
Unknown non-built-in tags are custom Zotonic scomps. Find them under src/scomps/ as scomp_<module>_<tag>.erl; examples include cotonic_pathname_search, wire, button, pager, menu, and live depending on enabled modules.
Template filters are Erlang modules under src/filters/ named filter_name.erl. The template filter {{ value|summary:120 }} maps to filter_summary:summary(Value, 120, Context).
Check apps/zotonic_mod_base/src/filters/ first for core filters, then app/module src/filters/ directories for module-specific filters.
Filters should have a -moduledoc in their src/filters/filter_*.erl source file; use that source documentation as the reference.
default, default_if_none, and default_if_undefined are inlined by template_compiler; many other filters call filter_<name> modules.
Use escaping filters such as escape, escapejs, escapejson, sanitize_html, sanitize_url, and urlencode at trust boundaries.

Scomps

Scomps are screen components: server-side template tags that render HTML, JavaScript, or wire actions from Erlang.

Use scomps as normal template tags, for example:

{% button text=_"Save" action={submit} %}
{% wire id="form" type="submit" postback={save id=id} %}
{% pager result=result dispatch="page" %}
{% menu id=`main_menu` %}

Unknown non-built-in tags are usually scomps. Find their implementation under src/scomps/ as scomp_<module>_<tag>.erl.
Scomps should have a -moduledoc that documents accepted arguments, generated markup, emitted JavaScript, postbacks, and security assumptions.
Prefer existing scomps for common Zotonic behavior such as buttons, wires, validation, live updates, sortable lists, menus, tabs, pagers, and Cotonic integration.
Keep scomp arguments explicit and translated where user-facing, for example text=_"Delete" and title=_"Delete this page.".
If a scomp collects JavaScript or wires, ensure the base template ends with {% script %}.

Forms

Use normal HTML forms and wire them with Zotonic when the result should be handled by Erlang: {% wire id="contact-form" type="submit" postback={contact []} delegate=`mod_contact` %}.
Forms that submit by postback normally use method="post" action="postback" and have a stable id.
Use {% button %} or action {submit} when the local template pattern uses Zotonic buttons instead of raw submit buttons.
In the receiving event(#submit{}, Context), fetch fields with z_context:get_q/2, z_context:get_q_all/1, or z_context:get_q_validated/2; never trust client-side validation alone.
Use z_context:get_q_all_noz/1 or z_context:get_q_map_noz/1 when processing ordinary form fields and excluding Zotonic internal parameters.
Add validation with {% validate %} next to the field being validated. The validation tag emits LiveValidation JavaScript and also enables server-side validation for submit/postback handling.

{% wire id="contact-form" type="submit" postback={contact []} delegate=`mod_contact` %}
<form id="contact-form" method="post" action="postback">
    <input id="mail" name="mail" type="email">
    {% validate id="mail" type={presence} type={email} %}

    <textarea id="message" name="message"></textarea>
    {% validate id="message" type={presence failure_message=_"Please enter a message."} %}

    <button type="submit">{_ Send _}</button>
</form>

The id argument of {% validate %} is the input element id. Use name="field_name" when the submitted field name differs from the element id.
Multiple type={...} arguments can be used on the same field, for example type={presence} type={email}.
Common validation options include failure_message, valid_message, message_after, only_on_blur, only_on_submit, wait, trigger, and target.
Use generated ids such as id=#email name="email" when a partial can be rendered multiple times on one page.
File inputs can use the presence validator; submitted uploads arrive as #upload{} values.
Include _js_include.tpl/admin JS includes and end the page with {% script %} so LiveValidation, validators, wires, and form postbacks are initialized.

Validators

Template validators are implemented by Erlang modules in src/validators/ named validator_<module>_<name>.erl.
Validator type names in templates map to those modules. {% validate id="email" type={email} %} resolves to validator_base_email; module-specific validators include examples such as validator_admin_identity_username_unique.
Core validators are in apps/zotonic_mod_base/src/validators/; inspect their -moduledoc before using unfamiliar arguments.
Common core validators include presence, email, length, numericality, format, date, json, acceptance, confirmation, postback, name_unique, and page_path_unique.
Validators generally implement render_validator/5 for client-side LiveValidation setup and validate/5 for server-side checks.
A validator can return extra validation args from render_validator/5; those args are passed to validate/5 during server validation.
The postback validator performs custom server-side validation through a notification or delegate; use it for checks that need database lookups, ACL checks, or external state.

<input id="username" name="username" type="text">
{% validate id="username" wait=400
            type={presence}
            type={postback event="validate_username"} %}

For a custom validator, add src/validators/validator_mymodule_slug.erl, export render_validator/5 and validate/5, include zotonic.hrl, and document all template arguments in -moduledoc.
Client-side LiveValidation is for responsiveness; all security and data integrity checks must also happen server-side in the validator, event/2, model, or controller.

Source Documentation

Filters, scomps, validators, models, and modules should always include a -moduledoc in their Erlang source file.
Use those -moduledoc entries as the authoritative local documentation for template-facing behavior.
Do not rely on doc/_build; it was generated by older documentation systems and is not expected to exist.

Models

Access template models through m, using the model name without the m_ prefix: m.rsc, m.search, m.req, m.acl, m.config, m.category, m.media, m.edge, and module-specific models.
Model paths use dot/index notation. Examples: {{ m.rsc[id].title }}, {{ m.acl.user }}, {{ m.req.host|escape }}, {{ m.config.site.title.value }}.
Use the shorthand id.title, id.summary, id.o.haspart, and id.s.author only when id is the sanitized page resource or came from m.rsc.
Use search models for resource lists and prefer the :: payload operator for new search calls: {% for id in m.search.query::%{ cat: ["news"], pagelen: 10 } %}.
Use {% with %} to avoid repeating expensive model lookups, especially searches: {% with m.search.query::%{ cat: ["news"], pagelen: 10 } as latest_news %}.
Models are implemented in src/models/ as m_name.erl modules with the zotonic_model behaviour. Core models live in apps/zotonic_core/src/models/; module models live in each module's src/models/.
Models should have a -moduledoc in their src/models/m_*.erl source file; use that source documentation as the reference. The old doc/_build generated docs are an obsolete artifact and should not be relied on.
Before using output from a less familiar model, read its source documentation and check whether it performs ACL checks and whether returned values are safe for direct HTML output.

Model Payloads

Use the :: operator to pass a structured payload to a model call. The expression after :: is passed as the model payload instead of being part of the path.
Prefer maps for payloads: m.search.query::%{ cat: ["article"], is_published: true, sort: ["-created"], pagelen: 20, page: q.page }.
The path before :: still selects the model and operation. In m.search.paged.query::%{ text: q.qs }, the path is [paged, query] and the payload is the map.
For the search model, prefer :: over the older tuple/list query syntax. It is clearer, easier to extend, and matches model API payload handling.
Older tuple-style search syntax, such as m.search[{latest cat="text" pagelen=10}], is still encountered in existing templates and docs but should not be copied for new code.
Use tuple-style only when maintaining existing code that depends on the deprecated search representation or when the target model explicitly documents tuple input.
Treat payload values from q as unsafe. A structured payload can safely pass q.page to the model for validation, but never render q.* directly without escaping.

Resource And URL Patterns

Prefer {{ id.title }}, {{ id.summary }}, {{ id.body }}, and {{ id.depiction }} when id is the sanitized page resource.
Use m.rsc[unsafe_id] when the resource id comes from an untrusted source; Zotonic will sanitize through the model.
Use {{ m.rsc.unique_name.page_url }} for named page resources.
Use {% url dispatch_name id=id %} for dispatch/controller URLs.
Do not hard-code internal URLs when a dispatch rule or resource page_url exists.
Use {% image id mediaclass="..." alt=id.title %} or {% media id %} for media; define image sizes in priv/templates/mediaclass.config.

CSS And Bootstrap

Put source styles in priv/lib-src/ and generated browser assets in priv/lib/; templates should include generated CSS with {% lib "css/file.css" %} or module/site include templates.
Do not edit generated CSS in priv/lib/ when a matching SCSS/LESS source exists. Edit the source file and rerun the relevant Makefile.
Use the local build pattern. Most style builds are run from the source directory, for example make -C apps/zotonic_mod_bootstrap/priv/lib-src, make -C apps/zotonic_mod_bootstrap/priv/lib-src/bootstrap, make -C apps/zotonic_mod_admin/priv/lib-src/admin-bootstrap5, or make -C apps_user/zotonicwww2/priv/lib-src.
SCSS builds use Dart Sass via the sass command; older icon/base styles may still use lessc. If a Makefile defines SASS ?= sass, override it with make SASS=/path/to/sass only when needed.
zotonic_mod_bootstrap keeps Bootstrap sources under priv/lib-src/bootstrap/scss and Bootstrap 3 compatibility shims under priv/lib-src/bootstrap/compat. Its build emits priv/lib/bootstrap/css/bootstrap.css (Bootstrap 5 plus Bootstrap 3 compat), bootstrap5.css (Bootstrap 5 without compat), bootstrap3-compat.css (compat only), theme CSS, and minified variants.
Use bootstrap.css when existing templates still use Bootstrap 3 class names and need the compatibility layer. Use bootstrap5.css only when templates are written for Bootstrap 5 classes or when a site includes compatibility separately.
The admin has separate Bootstrap builds: priv/lib-src/admin-bootstrap3 is kept for old Bootstrap 3 output, and priv/lib-src/admin-bootstrap5 builds priv/lib/css/admin-bootstrap5.css and .min.css with Bootstrap 5, admin overrides, and the admin Bootstrap 3 compatibility file.
Admin theme and component styles live in apps/zotonic_mod_admin/priv/lib-src/zotonic-admin/scss; prefer CSS custom properties from _theme.scss/_variables.scss for colors so light/dark themes keep working.
Bootstrap 3 compatibility files should stay in separate compat/ directories. Keep them SCSS-friendly with variables and nested selectors where that improves maintainability.
When adding or changing template classes, first check whether the project is relying on Bootstrap 3 compatibility. Avoid changing large template class sets just to satisfy Bootstrap 5 if compat CSS is intended to preserve them.
For dark/light theme support, prefer existing CSS variables and add new variables near the theme files rather than hard-coded colors in component partials.
After SCSS/LESS edits, rerun the relevant Makefile and verify both normal and .min.css outputs if the build produces minified files.

Cotonic

Cotonic is Zotonic's browser-side JavaScript runtime for isolated components, workers, and MQTT-style publish/subscribe messaging.
Cotonic exposes cotonic on the page, including cotonic.ready, cotonic.broker.publish, cotonic.broker.subscribe, cotonic.broker.call, cotonic.spawn, cotonic.spawn_named, and MQTT helpers such as cotonic.mqtt.matches, fill, and extract.
Cotonic topics are slash-separated MQTT-style topics. Use + and # wildcards in subscriptions; named wildcards such as +id can be extracted by Cotonic helpers.
Zotonic bridges the browser broker to the server over the origin MQTT bridge. Server topics are commonly addressed with bridge/origin/..., for example bridge/origin/model/rsc/event/{{ id }}/delete.
Include Cotonic through Zotonic's standard head/JS includes. Do not hand-roll the low-level bridge setup unless working on mod_base itself.
Ensure the base template includes {% all include "_html_head.tpl" %} or _html_head_admin.tpl; these include Cotonic head setup such as _html_head_cotonic.tpl.
Ensure the JS includes load cotonic/cotonic.js and the Zotonic wired app when the site uses declarative data attributes or wires.
Add data-cotonic-pathname-search="{% cotonic_pathname_search %}" to <body>; Zotonic's wired JS warns when it is missing and Cotonic UI/location handling depends on it.
Use cotonic.ready.then(function() { ... }) before calling Cotonic APIs from inline page JavaScript that must run after initialization.

Cotonic Data Attributes

Prefer Cotonic data attributes for simple declarative behavior instead of ad-hoc JavaScript event handlers.
Use data-onclick-topic="topic", data-onsubmit-topic="topic", and data-oninput-topic="topic" to publish DOM events to Cotonic topics. Example: <a href="#back" data-onclick-topic="model/location/post/redirect/back">.
For live search/filter forms, use data-onsubmit-topic="model/location/post/qlist/submit" and data-oninput-topic="model/location/post/qlist/submit" on a GET form.
Event data attributes normally prevent default behavior and stop propagation. Use data-onclick-cancel, data-onsubmit-cancel, or data-oninput-cancel when local behavior needs different cancellation semantics.
Use Cotonic location model topics for URL behavior: model/location/post/redirect/back, model/location/post/qlist/submit, model/location/post/push, model/location/post/replace, and their silent variants when appropriate.
Use storage topics instead of direct storage access when cooperating with Cotonic components: model/localStorage/get/+key, model/localStorage/post/+key, model/sessionStorage/get/+key, and matching event/+key topics.
Use UI topics such as model/ui/insert/+key, model/ui/update/+key, model/ui/delete/+key, and model/ui/event/dom-updated/+key for DOM updates managed by Cotonic UI code.
Escape any template values placed inside data attributes, especially topic fragments or payload-like values that include q.* or non-resource model output.
Keep data attributes readable and topic-oriented; if a behavior needs complex state, use a scomp, a Cotonic model, or a dedicated JavaScript module.

JavaScript And Interactivity

Put inline template-collected JavaScript inside {% javascript %}...{% endjavascript %} and ensure the base has {% script %}.
Use Zotonic declarative behavior ({% wire %}, scomps, Cotonic widgets, do_* classes) when nearby templates use it.
Include Cotonic assets through the site _js_include.tpl and module head/body hooks, not by duplicating low-level bridge snippets.