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Nitro Kitv2.0.0.alpha.4

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IntroductionGalleryAgent guideGalleryHuman guideGalleryColorsFoundations · ThemeTypographyFoundations · ThemeSpacing & sizingFoundations · ThemeEffectsFoundations · ThemeButtonComponents · ActionsButton groupComponents · ActionsButton toComponents · ActionsAppearance pickerComponents · FormsCheckboxComponents · FormsCheckbox groupComponents · FormsComboboxComponents · FormsControl groupComponents · FormsDropzoneComponents · FormsFieldComponents · FormsField groupComponents · FormsFieldsetComponents · FormsInputComponents · FormsLabelComponents · FormsRadio buttonComponents · FormsRadio button groupComponents · FormsRich text areaComponents · FormsSelectComponents · FormsSwitchComponents · FormsTextareaComponents · FormsCommand paletteComponents · OverlaysDialogComponents · OverlaysDropdownComponents · OverlaysSheetComponents · OverlaysTooltipComponents · OverlaysAlertComponents · FeedbackEmpty stateComponents · FeedbackToastComponents · FeedbackAccordionComponents · Data displayAvatarComponents · Data displayAvatar stackComponents · Data displayBadgeComponents · Data displayDetails tableComponents · Data displayIconComponents · Data displayProgressive imageComponents · Data displayStat gridComponents · Data displayTableComponents · Data displayTypesetComponents · Data displayPaginationComponents · NavigationPagination barComponents · NavigationTabsComponents · NavigationToolbarComponents · NavigationCardComponents · LayoutContainerComponents · LayoutFlexComponents · LayoutGridComponents · LayoutApplication navigationComponents · ApplicationApplication shellComponents · ApplicationAuthentication shellComponents · ApplicationDanger zoneComponents · ApplicationData sectionComponents · ApplicationForm sectionComponents · ApplicationPage headerComponents · ApplicationSettings layoutComponents · ApplicationSign inCompositions · Access & onboardingPassword resetCompositions · Access & onboardingEmail verificationCompositions · Access & onboardingInvitation acceptanceCompositions · Access & onboardingAccount creationCompositions · Access & onboardingAccount securityCompositions · Access & onboardingWorkspace onboardingCompositions · Access & onboardingBranched onboardingCompositions · Access & onboardingWorkspace dashboardCompositions · Workspace & organizationWorkspace settingsCompositions · Workspace & organizationWorkspace usersCompositions · Workspace & organizationTeam managementCompositions · Workspace & organizationAPI credentialsCompositions · Workspace & organizationOrganization overviewCompositions · Workspace & organizationOrganization settingsCompositions · Workspace & organizationTeam activityCompositions · Workspace & organizationTeam memberCompositions · Workspace & organizationSubscription billingCompositions · Billing & commerceCheckout and paymentCompositions · Billing & commerceCheckout resultsCompositions · Billing & commerceData resource overviewCompositions · Data & operationsData resource activityCompositions · Data & operationsData resource settingsCompositions · Data & operationsProduct resource lifecycleCompositions · Data & operationsAPI webhooksCompositions · Data & operationsIntegration managementCompositions · Data & operationsFile uploadsCompositions · Data & operationsActivity and audit logCompositions · Data & operationsChangelogCompositions · Product & supportHelp centerCompositions · Product & supportSystem status and errorsCompositions · Product & supportProduct landingCompositions · MarketingPublic pricingCompositions · MarketingProduct featuresCompositions · MarketingPublic contactCompositions · MarketingSidebar operations applicationCompositions · Complete applicationsTopbar media applicationCompositions · Complete applicationsHybrid account applicationCompositions · Complete applications

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  • Introduction
  • Agent guide
  • Human guide
  • Foundations
    • Colors
    • Typography
    • Spacing & sizing
    • Effects
  • Actions
    • Button
    • Button group
    • Button to
  • Forms
    • Appearance picker
    • Checkbox
    • Checkbox group
    • Combobox
    • Control group
    • Dropzone
    • Field
    • Field group
    • Fieldset
    • Input
    • Label
    • Radio button
    • Radio button group
    • Rich text area
    • Select
    • Switch
    • Textarea
  • Overlays
    • Command palette
    • Dialog
    • Dropdown
    • Sheet
    • Tooltip
  • Feedback
    • Alert
    • Empty state
    • Toast
  • Data display
    • Accordion
    • Avatar
    • Avatar stack
    • Badge
    • Details table
    • Icon
    • Progressive image
    • Stat grid
    • Table
    • Typeset
  • Navigation
    • Pagination
    • Pagination bar
    • Tabs
    • Toolbar
  • Layout
    • Card
    • Container
    • Flex
    • Grid
  • Application
    • Application navigation
    • Application shell
    • Authentication shell
    • Danger zone
    • Data section
    • Form section
    • Page header
    • Settings layout
  • Access & onboarding
    • Sign in
    • Password reset
    • Email verification
    • Invitation acceptance
    • Account creation
    • Account security
    • Workspace onboarding
    • Branched onboarding
  • Workspace & organization
    • Workspace dashboard
    • Workspace settings
    • Workspace users
    • Team management
    • API credentials
    • Organization overview
    • Organization settings
    • Team activity
    • Team member
  • Billing & commerce
    • Subscription billing
    • Checkout and payment
    • Checkout results
  • Data & operations
    • Data resource overview
    • Data resource activity
    • Data resource settings
    • Product resource lifecycle
    • API webhooks
    • Integration management
    • File uploads
    • Activity and audit log
  • Product & support
    • Changelog
    • Help center
    • System status and errors
  • Marketing
    • Product landing
    • Public pricing
    • Product features
    • Public contact
  • Complete applications
    • Sidebar operations application
    • Topbar media application
    • Hybrid account application

Appearance picker

Native light, dark, and system preferences synchronized through one document runtime.

Source
app/components/nitro_kit/appearance_picker.rb
API
NitroKit::AppearancePicker.new(id:, label: "Appearance")

Native preferences

Light, dark, and system remain labelled radio choices without JavaScript.

Default appearance

Appearance
Viewport640 px · sm
Rubytest/dummy/app/components/gallery/components/appearance_picker_page.rb
render NitroKit::AppearancePicker.new(id: "gallery-appearance-default")

Product language

Color appearance
Viewport640 px · sm
Rubytest/dummy/app/components/gallery/components/appearance_picker_page.rb
render NitroKit::AppearancePicker.new(
  id: "gallery-appearance-product",
  label: "Color appearance"
)

Stacked radios

Appearance
Viewport640 px · sm
Rubytest/dummy/app/components/gallery/components/appearance_picker_page.rb
render NitroKit::AppearancePicker.new(
  id: "gallery-appearance-radios",
  presentation: :radios
)

Compact select

Viewport640 px · sm
Rubytest/dummy/app/components/gallery/components/appearance_picker_page.rb
render NitroKit::AppearancePicker.new(
  id: "gallery-appearance-select",
  presentation: :select
)

Navigation dropdown

Appearance
Viewport640 px · sm
Rubytest/dummy/app/components/gallery/components/appearance_picker_page.rb
render NitroKit::AppearancePicker.new(
  id: "gallery-appearance-dropdown",
  presentation: :dropdown
)

Server-persisted preference

preference: renders the server-saved choice without JavaScript; once JavaScript connects, every picker mirrors this document's one preference.

Rendered with preference: :light
Saved appearance
Rendered with preference: :dark
Saved appearance
Rendered with preference: :system
Saved appearance
Viewport640 px · sm
Rubytest/dummy/app/components/gallery/components/appearance_picker_page.rb
NitroKit::AppearancePicker::PREFERENCES.each do |preference|
  sample("Rendered with preference: :#{preference}", slug: preference.to_s) do
    render NitroKit::AppearancePicker.new(
      id: "gallery-appearance-preference-#{preference}",
      label: "Saved appearance",
      preference:
    )
  end
end

Synchronized subscribers

Every mounted picker reflects the one document-owned preference.

Two controls for one preference

Navigation control
Site appearance
Settings control
Account appearance
Viewport640 px · sm
Rubytest/dummy/app/components/gallery/components/appearance_picker_page.rb
sample("Navigation control", slug: "navigation-control") do
  render NitroKit::AppearancePicker.new(
    id: "gallery-appearance-navigation",
    label: "Site appearance"
  )
end

sample("Settings control", slug: "settings-control") do
  render NitroKit::AppearancePicker.new(
    id: "gallery-appearance-settings",
    label: "Account appearance"
  )
end

Application composition

Appearance is a document preference, even when the control lives in a settings surface.

Personalization card

Personalization

Choose a fixed appearance or keep this browser in step with the operating system.

Interface appearance
Saved in this browser
Viewport640 px · sm
Rubytest/dummy/app/components/gallery/components/appearance_picker_page.rb
render NitroKit::Card.new(id: "gallery-appearance-card") do |card|
  card.title("Personalization", level: 3)
  card.body do
    p { "Choose a fixed appearance or keep this browser in step with the operating system." }
    render NitroKit::AppearancePicker.new(
      id: "gallery-appearance-card-control",
      label: "Interface appearance"
    )
  end
  card.footer do
    render NitroKit::Badge.new("Saved in this browser", variant: :outline, color: :neutral)
  end
end

Component contract

Constructor options, rendered root, closed vocabularies, and compound boundary for this component, exactly as shipped.

docs/component_contracts.md · NitroKit::AppearancePicker

Constructor-specific options
  • required id:
  • label: defaulting to I18n.t("nitro_kit.appearance_picker.label")
  • label_visible: true
  • presentation: :segmented
  • preference: :system
Root and closed vocabulary
fieldset, label, or div[data-nk=appearance-picker]; presentations segmented radios select dropdown; preferences light dark system
Contract
Owns labelled native choices or an icon-only Dropdown trigger with icon-led preference buttons. preference: renders the server-persisted choice as the initial data-state, checked radio, selected option, and trigger icon, so a stored preference does not flash. It requests changes from and subscribes to the document runtime; zero or many picker instances do not duplicate document media/storage listeners. id: follows the shared fragment-safe identifier contract. Segmented selection styling keys off the native :checked radio, with data-state mirrored only by the controller; enhanced dropdown preference items expose role="menuitemradio" with aria-checked reflecting the document preference. Preference names come from nitro_kit.appearance_picker.preferences.*. label_visible: false requires the segmented presentation, renders no legend — browsers give legends special layout — and names the fieldset through aria-label; the segmented row fills its container and the segments share the width equally.

System rules for coding agents

Instructions for coding agents, repeated on every component page so one fetched page has enough context. Humans can usually skip this section.

test/dummy/app/components/gallery/agent_rules.rb

View agent instructions
  • Nitro Kit 2.0 is a gem-owned, Phlex-only UI system for Rails. Render components directly: render NitroKit::Button.new("Save", variant: :primary).
  • Compose Nitro components inside application-owned Phlex classes. Public initializers and declared slots are the component API; private methods are not.
  • Public options are explicit keywords, and enumerated options are closed vocabularies. Invalid names or values raise ArgumentError; this component's accepted options are in the contract above.
  • Pass native attributes through their typed boundary: html: for HTML, aria: for ARIA, and data: for application data. class and style are forbidden, including inside html:.
  • Nitro owns NitroKit::Component::RESERVED_DATA_ATTRIBUTES: data-nk, data-slot, data-variant, data-size, data-nk-escape, data-enhanced, data-state, data-disabled, data-required, data-orientation, data-presentation, data-placement, data-layout, data-side, data-field-type, data-dir, data-gap, data-align, data-justify, data-wrap, data-cols, data-mode, data-key. Do not pass them through data:. data-action, data-controller are additive and compose with Nitro behavior.
  • If an integration truly requires a class, use desperately_need_a_class:. It requires a non-blank String and marks the exception with data-nk-escape="class".
  • Every root emits data-nk; owned parts emit component-qualified data-slot values such as field-control or card-title. Select on those attributes, never on classes.
  • Customize components with documented --nk-* custom properties in an application stylesheet. Variables beginning with --_nk-* are private component mechanics.
  • Use NitroKit::Flex and NitroKit::Grid for layout. Parents own external placement and available width; components own their intrinsic geometry.
  • Preserve native elements and accessibility semantics. State is exposed through native semantics and ARIA first, and through data-state when styling or behavior also needs it.