c2n/web-componentsv1.0.18
OverviewGetting startedComponentsIconsGuidesExamples
OverviewGetting startedComponentsIconsGuidesExamples
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Reaction Bar

Emoji reactions with counts under a message or comment, toggled by the current user, with a picker to add more.

Attributes

NameTypeDefaultDescription
reactionsReaction[][]The reactions, in the order they are shown. As an attribute, a JSON array of { emoji, count, reacted }.
quickstring[]DEFAULT_QUICKThe reactions offered first in the popup. As an attribute, emoji separated by spaces.
readonlybooleanfalseShows the reactions without the add button, and pressing them does nothing.
labelstring—The accessible name of the bar. Defaults to "Reactions" in the page's language.

Slots

NameDescription
pickerA c2-emoji-picker shown in the popup under the quick reactions. Its emoji-select adds that reaction and closes the popup.

Events

NameTypeDescription
reaction-changeCustomEvent<ReactionChangeDetail>The current user added or removed a reaction. Cancelable: cancel it to leave reactions unchanged.

CSS parts

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

NameDescription
reactionOne reaction pill.
emojiThe emoji in a pill.
countThe count in a pill.
addThe button that opens the popup.
menuThe popup's box, holding the quick reactions and the picker slot.
quickThe row of quick reactions in the popup.

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-reaction-bar
--c2-reaction-bar--gappixel4pxSpace between the pills.
c2-reaction-bar > reaction
--c2-reaction-bar__reaction--heightpixel28px
--c2-reaction-bar__reaction--paddingpadding0 8px
--c2-reaction-bar__reaction--borderborder1px solid #e4e4e7
--c2-reaction-bar__reaction--border-radiusborder-radius999px
--c2-reaction-bar__reaction--background-colorcolor#f4f4f5
c2-reaction-bar > reaction > hover
--c2-reaction-bar__reaction__hover--border-colorcolor#a1a1aa
c2-reaction-bar > reaction > reacted
--c2-reaction-bar__reaction__reacted--background-colorcolor#edf1feA pill the current user reacted with.
--c2-reaction-bar__reaction__reacted--border-colorcolorrgb(2, 101, 220)
--c2-reaction-bar__reaction__reacted--colorcolorrgb(2, 101, 220)The count of a pill the current user reacted with.
c2-reaction-bar > reaction > focus
--c2-reaction-bar__reaction__focus--outlineoutline2px solid rgba(2, 101, 220, 0.4)
c2-reaction-bar > emoji
--c2-reaction-bar__emoji--font-sizefont-size16px
--c2-reaction-bar__emoji--font-familyfont-familyApple Color Emoji, Segoe UI Emoji, Noto Color Emoji, sans-serif
c2-reaction-bar > count
--c2-reaction-bar__count--colorcolor#52525b
--c2-reaction-bar__count--font-sizefont-size12px
--c2-reaction-bar__count--font-weightfont-weight500
c2-reaction-bar > add
--c2-reaction-bar__add--colorcolor#71717aThe add button's icon.
c2-reaction-bar > add > hover
--c2-reaction-bar__add__hover--colorcolor#18181b
c2-reaction-bar > menu
--c2-reaction-bar__menu--background-colorcolor#ffffff
--c2-reaction-bar__menu--borderborder1px solid #e4e4e7
--c2-reaction-bar__menu--border-radiusborder-radius8px
--c2-reaction-bar__menu--box-shadowshadow0 4px 12px rgba(0, 0, 0, 0.12)
--c2-reaction-bar__menu--paddingpadding6px
c2-reaction-bar > quick
--c2-reaction-bar__quick--sizepixel32pxWidth and height of each quick reaction.
--c2-reaction-bar__quick--font-sizefont-size20px
c2-reaction-bar > quick > hover
--c2-reaction-bar__quick__hover--background-colorcolor#f4f4f5

Text and languages

The text the component shows, in English. It shows another language when the app adds one with addTranslations, under reaction-bar, and the nearest lang asks for it; any message not translated stays in English. {0}, {1}… stand for the values a message carries. Languages guide.

KeyEnglishValues
labelReactions—
addAdd reaction—
quickQuick reactions—
reaction{0}, {1} reactions{0} emoji
{1} count
readonlyReaction{0}, {1} reactions, including yours{0} emoji
{1} count
{2} reacted
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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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