c2n/web-componentsv1.0.18
OverviewGetting startedComponentsIconsGuidesExamples
OverviewGetting startedComponentsIconsGuidesExamples
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Button Group

Joined actions and polished segmented controls with single or multiple selection.

c2-button-group attaches related c2-button or c2-icon-button elements into one control. The default joined appearance shares borders and outside corners. Use appearance="segmented" for an inset track with an animated single-selection surface; it selects the first enabled item when value is omitted and supports arrow, Home and End keys. Both appearances support orientation="vertical"; vertical selectable groups use Up/Down while horizontal groups use Left/Right. Set selection="single" or selection="multiple" explicitly for selectable joined groups.

For a main action joined to a caret that opens a menu of alternatives (“Send ▾”), use c2-split-button instead of combining a group with a c2-menu.

Import

import '@c2n/components/button-group'

The examples use icons from the separate @c2n/feather-icons package: npm install @c2n/feather-icons.

Importing @c2n/components/button-group also registers c2-button and c2-icon-button.

Usage

Items identify themselves with a value attribute (their index otherwise). In single mode the group’s value is the pressed item’s value and clicking the pressed item keeps it pressed; in multiple mode value is a comma-separated list and each click toggles one entry. Set value from code to change the selection silently; input and then change fire for pointer and keyboard selection, with the new value in change’s detail.value. The group marks its items toggle in selection modes so unpressed buttons still announce aria-pressed="false", and disabled on the group disables every item without touching the ones you disabled yourself.

The group owns the frame of its items through the button variables: --c2-button-group--border applies one border to every item (an outlined group), --c2-button-group--border-radius rounds the outside corners, and attached items overlap by --c2-button-group__divider--width so shared borders are drawn once. In segmented appearance, size="s|m|l" controls the item dimensions and stretched makes all items share the available width. The track, item and animated indicator each have dedicated --c2-button-group__segmented-* and --c2-button-group__indicator-* theme variables.

Keyboard and toolbars

A single-selection group (including every segmented one) is one Tab stop, like a radio group: Tab lands on the pressed item, and the arrow keys move the selection, Home and End jump to the ends, and disabled items are skipped. A plain or multiple group keeps one Tab stop per item.

Add toolbar for a row of controls that belongs together: a formatting bar, a table’s actions. The group takes the toolbar role and stays one Tab stop, remembering the item focused last, and the arrow keys, Home and End move focus across every focusable child — c2-button, c2-icon-button, c2-select, c2-text-field, links — without changing the selection, which Space and Enter still do. A key the focused control uses itself is left to it: Up and Down open a c2-select, and inside a text field the arrows and Home/End move the caret, so put a text field last in its toolbar. toolbar combines with any selection and either orientation.

In a form

With a name, the group is a form control: it submits its pressed values under that name (one entry per value with selection="multiple", nothing when none is pressed), goes back to its initial value when the form resets, and is disabled by a disabled <fieldset>. It fires input just before change, so v-model and Angular’s ngModel bind to it like any other control.

<form>
  <c2-button-group name="view" appearance="segmented" value="list" aria-label="View">
    <c2-button value="list">List</c2-button>
    <c2-button value="board">Board</c2-button>
  </c2-button-group>
</form>
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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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