superpowers-sage-sage-forms

name	superpowers-sage:sage-forms
description	HTML Forms + Sage integration — log1x/sage-html-forms, hf_get_form, addPostObject html-form, Blade form views, x-form.* shared components, hf-validation JS module, hf-success hf-error hf-submitted events, Constraint Validation API, form traps pattern escaping type-tel ValidityState non-enumerable — stateless contact forms with progressive JS validation on top of the HTML Forms WordPress plugin. Invoke for: contact form with HTML Forms plugin, hf_get_form usage, form validation with Constraint API, pattern escaping trap, type=tel Chrome bug, form audit.
user-invocable	false

HTML Forms + Sage Integration

Stateless form rendering via the HTML Forms WordPress plugin, bridged into Sage by log1x/sage-html-forms. Forms live as a CPT (html-form), are referenced from ACF blocks via addPostObject, and render through a Blade filter that routes to project-controlled form views.

When to Use

Approach	Best for
HTML Forms + sage-html-forms	Stateless contact/lead forms; editors pick the form from a dropdown; submissions handled by the HF plugin
Livewire form	Reactive state, multi-step wizards, inline validation tied to server state
Blade + native <form>	Single-field or trivial forms with no submission pipeline

When NOT to Use

• Form requires multi-step state → use Livewire (acorn-livewire skill)
• Form payload drives a Laravel controller action → Acorn Routes + Blade form, not HTML Forms
• Form must be embedded outside a block context (e.g. header newsletter) → Blade component + native <form> is simpler

Prerequisites

• Sage 11+ / Acorn 4+ on Bedrock with Lando
• ACF Composer installed (for the block field declaration)
• Shared x-form.* components present in resources/views/components/form/ (the design-system form primitives)

Installation Summary

lando composer require wpackagist-plugin/html-forms
lando theme-composer require log1x/sage-html-forms

Acorn's package discovery auto-registers the service provider — no manual wiring. Full details: references/installation.md.

Integration Pattern Summary

The form is a html-form CPT post. A block exposes an ACF addPostObject field scoped to that CPT so the editor picks the form. The block view renders it via hf_get_form($form->ID)->get_html(), which the sage-html-forms provider intercepts and routes to a Blade view at resources/views/forms/{form-slug}.blade.php. The Blade form view uses the project's x-form.* components.

{{-- Block view (snippet) --}}
@if ($form)
    {!! hf_get_form($form->ID)->get_html() !!}
@endif

{{-- resources/views/forms/{form-slug}.blade.php --}}
<x-html-forms :form="$form">
    <x-form.field label="Name" for="name" :required="true">
        <x-form.input type="text" name="name" :required="true" minlength="2" />
    </x-form.field>
    {{-- ...more fields... --}}
    <x-button type="submit" variant="primary" class="w-full">Send</x-button>
</x-html-forms>

Full walkthrough: references/blade-form-views.md.

Validation Module Summary

Client-side validation is a reusable ES module imported by the block's JS — never globally enqueued. The module exposes one function:

initHfValidation(formEl, { messages, validators, onSuccess, onError });

Four layers: native HTML5 constraints, blur validation, input lazy re-validation while aria-invalid="true", and post-submit scroll via the HTML Forms plugin's DOM events (hf-success, hf-error, hf-submitted).

Full API and implementation: references/hf-validation.md.

Traps (Critical)

Three documented bugs that silently break forms in this stack. Full symptom/root cause/fix for each: references/traps.md.

• T1 — pattern attribute backslash escaping in Blade components. $attributes->merge() double-escapes backslashes; patternMismatch never fires. Symptom: form submits even though pattern regex doesn't match user input. Workaround: use a JS validator, not a pattern attribute.
• T2 — type="tel" skips patternMismatch in Chrome. Use type="text" inputmode="tel" instead. Symptom: phone format validator silently no-ops in Chrome (works in Firefox/Safari).
• T3 — ValidityState is non-enumerable. Spread ({ ...field.validity }) and Object.keys() return empty. Symptom: your error-message lookup object is always empty. Access named properties directly: validity.valueMissing, validity.patternMismatch, validity.tooShort, validity.customError, etc.

File Map (canonical per form integration)

File	Role
app/Blocks/{ClassName}.php	ACF block — addPostObject field + with() mapping
resources/views/blocks/{slug}.blade.php	Block view — calls hf_get_form($form->ID)->get_html()
resources/views/forms/{form-slug}.blade.php	Form view — x-html-forms + x-form.* structure
resources/js/blocks/{slug}.js	Block custom element — imports initHfValidation, configures per form
resources/js/modules/hf-validation.js	Reusable validation module (one per project, not per form)

Consumers

• agents/forms.md (user-invocable specialist — analyzes and refactors existing forms, or scaffolds new ones)
• skills/block-scaffolding/SKILL.md Phase 0c (coordinated scaffold when a block embeds a form)

Both consumers treat this skill as authoritative — no pattern, template, or trap is documented outside this skill.