c2n/web-componentsv1.0.18
OverviewGetting startedComponentsIconsGuidesExamples
OverviewGetting startedComponentsIconsGuidesExamples
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Radio

Radio options built on native inputs, grouped into one value with keyboard navigation.

c2-radio

A single radio option built on a native <input type="radio">, with its label and an optional description beside the control. Put several in a c2-radio-group to get a single value, arrow-key navigation and a roving tab stop; standalone radios that share a name in the same document or shadow root still uncheck each other. Theme the control, the label and the whole row (container), which turns a radio into a selectable card. The indicator is not tied to the ring: the dot slot swaps the inner mark, and icon / checked-icon replace the control with any icon per state.

Attributes

NameTypeDefaultDescription
checkedbooleanfalseWhether this option is selected. Checking one radio unchecks the others of its group.
disabledbooleanfalseDisables this option. A disabled c2-radio-group disables every radio inside it.
valuestring—Value reported by the group and by the inner input. Every radio of a group needs one.
namestring—Form field name. Inside a group, the group's name wins.
requiredbooleanfalseRequires this standalone radio, or its containing group, to have a selected option.
labelstring—Label text when the default slot is empty.
aria-labelstring—Accessible name used when no visible label names the radio.
aria-describedbyundefined | string—Id of the element that describes the radio.

Slots

NameDescription
(default)Label text. Falls back to the label attribute.
descriptionSupporting text shown under the label.
dotMark inside the ring while checked (an inline SVG, a c2-feather-* icon or a c2-mat-icon). Replaces the filled dot.
iconReplaces the ring with your own indicator. Shown while unchecked, and while checked too unless checked-icon is set.
checked-iconIndicator shown while checked, replacing the ring and dot. Without icon the default ring still shows while unchecked.

Events

NameTypeDescription
changeEventRe-dispatched from the inner input when the user checks this radio.

CSS parts

Shadow DOM styling hooks used with ::part(name). Prefer CSS custom properties when they cover the change.

NameDescription
controlThe default circular radio indicator.
dotChecked-mark region containing the dot slot or fallback inside the default control.
iconCustom indicator shown from the icon slot.
checked-iconCustom indicator shown from the checked-icon slot while checked.
labelThe option label.
descriptionSupporting-text region containing the description slot below the label.

CSS custom properties

Grouped by semantic target and state from --c2-<component>__<target>__<state>--<property>. Click a group to collapse it; click a name to copy it.

NameTypeDefaultDescription
c2-radio
c2-radio > container
--c2-radio__container--gappixel4pxSpace between the control and the text.
--c2-radio__container--flex-directionflex-direction-rowrowrow-reverse puts the indicator after the text, e.g. a trailing check mark.
--c2-radio__container--padding-toppadding0px
--c2-radio__container--padding-rightpadding0px
--c2-radio__container--padding-bottompadding0px
--c2-radio__container--padding-leftpadding0px
--c2-radio__container--borderbordernoneSet a border and padding for a card-style option.
--c2-radio__container--border-radiusborder-radius8px
--c2-radio__container--backgroundbackground—
c2-radio > container > hover
--c2-radio__container__hover--backgroundbackground—
c2-radio > container > checked
--c2-radio__container__checked--borderborder—
--c2-radio__container__checked--backgroundbackground—
c2-radio > control
--c2-radio__control--sizepixel18px
--c2-radio__control--border-radiusborder-radius999pxShape of the ring and its dot; 4px gives a square control.
--c2-radio__control--borderborder1px solid #bcbcc6
--c2-radio__control--background-colorcolortransparent
c2-radio > control > hover
--c2-radio__control__hover--borderborder1px solid #a1a1aa
c2-radio > control > checked
--c2-radio__control__checked--borderborder1px solid transparentTransparent so the fill shows through; set an accent border with a transparent fill for an outlined look.
--c2-radio__control__checked--background-colorcolor#0265dc
c2-radio > control > checked > hover
--c2-radio__control__checked__hover--background-colorcolor#0154b8
c2-radio > control > focus
--c2-radio__control__focus--outlineoutline2px solid rgba(2, 101, 220, 0.4)
--c2-radio__control__focus--outline-offsetpixel2px
c2-radio > control > disabled
--c2-radio__control__disabled--opacityopacity0.38
c2-radio > dot
--c2-radio__dot--sizepixel8px
--c2-radio__dot--colorcolor#ffffffFill of the dot, or currentColor of a slotted dot mark.
c2-radio > icon
--c2-radio__icon--sizepixel—Size of slotted icon / checked-icon content. Falls back to the control size.
--c2-radio__icon--colorcolor#71717aColour of the slotted indicator while unchecked.
c2-radio > icon > checked
--c2-radio__icon__checked--colorcolor#0265dcColour of the slotted indicator while checked.
c2-radio > state-layer
--c2-radio__state-layer--sizepixel32pxTouch target around the control; also the hover layer.
--c2-radio__state-layer--border-radiusborder-radius999px
c2-radio > state-layer > hover
--c2-radio__state-layer__hover--colorcolor—Tint of the hover layer; transparent unless set.
c2-radio > label
--c2-radio__label--colorcolorinherit
--c2-radio__label--font-sizefont-sizeinherit
--c2-radio__label--font-weightfont-weightinherit
--c2-radio__label--line-heightline-heightinherit
c2-radio > label > checked
--c2-radio__label__checked--colorcolor—
c2-radio > label > disabled
--c2-radio__label__disabled--opacityopacity0.38
c2-radio > description
--c2-radio__description--colorcolor#71717a
--c2-radio__description--font-sizefont-size12px
--c2-radio__description--line-heightline-height1.4
--c2-radio__description--margin-toppixel2px

c2-radio-group

Groups c2-radio options into one control: a single value, one name for every option, group-level disabled, and keyboard behaviour that matches native radios across the shadow boundary (Arrow keys move and select, only the selected option is a tab stop). Radios may sit anywhere inside the group, wrapped in other elements. The label and description slots name the group for assistive technology (role="radiogroup").

Attributes

NameTypeDefaultDescription
valuestring—value of the checked option; empty when none is checked. Setting it checks the matching option.
namestring—Form field name applied to every option.
disabledbooleanfalseDisables every option.
requiredbooleanfalseRequires one option to be selected for the form to be valid.
orientationRadioGroupOrientationverticalLays the options out in a row instead of a column.
aria-labelstring—Accessible name of the radiogroup when its heading does not label it.

Slots

NameDescription
(default)The c2-radio options, optionally inside wrapper elements.
labelGroup heading, announced as the group's name.
descriptionSupporting text under the heading.

Events

NameTypeDescription
changeCustomEvent<{ value: string }>Fired after the user selects another option. detail.value is the new value. Not fired for programmatic changes.

CSS custom properties

Grouped by semantic target and state from --c2-<component>__<target>__<state>--<property>. Click a group to collapse it; click a name to copy it.

NameTypeDefaultDescription
c2-radio-group
--c2-radio-group--gappixel8pxSpace between options.
--c2-radio-group--align-itemsalign-itemsflex-startstretch makes card-style options fill the width.
c2-radio-group > header
--c2-radio-group__header--gappixel2pxSpace between the label and the description.
--c2-radio-group__header--margin-bottompixel8pxSpace between the header and the options.
c2-radio-group > header > disabled
--c2-radio-group__header__disabled--opacityopacity0.38
c2-radio-group > label
--c2-radio-group__label--colorcolor#18181b
--c2-radio-group__label--font-sizefont-size14px
--c2-radio-group__label--font-weightfont-weight500
c2-radio-group > description
--c2-radio-group__description--colorcolor#71717a
--c2-radio-group__description--font-sizefont-size12px
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displayTreeHierarchical tree view with expansion, selection, checkboxes and lazy loading.Data displayTree SelectA dropdown for picking one or several rows from a hierarchy, with checkboxes, search and a form value.InputsTreemap chartA whole split into nested rectangles, each sized by its value: market maps, budgets and disk usage.ChartTruncateClamps text to a number of lines, with an optional Show more button.Data displayUploadDrag-and-drop file selection with validation, upload progress, retry, cancellation, and attachment results.InputsView OptionsThe Display popover of a collection: layout, grouping, ordering on several levels, Show switches and visible properties, reported as one plain value.InputsVirtual ListWindowed list with built-in search, sorting, selection and an async data source.Data displayVisually HiddenText for screen readers only: kept in the accessibility tree, drawn nowhere, optionally shown while it holds focus.LayoutWaterfall chartA running total bridged by the steps that move it, where one row is one step and totals mark where the bridge lands.ChartWeek PlannerWeekly schedule with time blocks: a typical week with optional odd and even weeks, or a dated week the user edits.PlanningWorking IndicatorA live "work in progress" line: animated mark, shimmering label, trailing dots and elapsed time.FeedbackFeather Icons287 open-source Feather icons, one web component each.IconsMat Icon2,234 Material Icons ligatures rendered through a single element.IconsPhosphor Icons1,512 flexible icons in six weights, one web component each.IconsSymbols157 themeable spot illustrations for empty states, status panels, onboarding and error pages.IconsTask icons191 duotone icons for to-do items: work, home, health, sport, learning, food, money, travel and more.IconsThemingTheme every c2n component from a handful of design tokens with @c2n/theme, or reach for any component variable directly.GuideLanguagesComponents show their text in English; add your app’s languages as one JSON object, picked by the nearest lang.GuideFrameworksUse the components from React, Vue, Angular, Svelte, Lit or plain HTML — typed events, generated template types, and the one piece of configuration each framework needs.GuideUsing c2n in an applicationThe workflow behind every c2n app: load the theme once, use c2-* tags directly, and turn every repeated pattern into a small variant or composed component.GuideAI toolsGive Claude Code, Codex, Google Antigravity or GitHub Copilot the c2n skill, live component APIs, examples and application conventions.GuideNo components match.
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