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

Multiline text input with resizing, helper and error text, and a character counter.

Attributes

NameTypeDefaultDescription
valuestring—Current text. Set this property to update the value programmatically.
namestring—Name forwarded to the native control.
labelstring—Accessible name for the native textarea.
aria-labelstring | nullnullAccessible name forwarded from the host.
placeholderstring—Hint shown when empty.
rowsnumber3Visible number of text lines.
colsnumber20Native width hint, used when no CSS width is set.
resize'none' | 'vertical' | 'horizontal' | 'both'verticalAllowed user resize directions.
wrap'soft' | 'hard' | 'off'softNative line wrapping mode.
autocompletestring—Browser autocomplete hint.
disabledbooleanfalsePrevents editing and removes the control from keyboard navigation.
readonlybooleanfalsePrevents editing while allowing selection.
requiredbooleanfalseRequires a nonempty value for native validation.
maxlengthnumber-1Maximum character count; -1 means unlimited.
minlengthnumber-1Minimum character count; -1 means no minimum.
errorbooleanfalseDisplays the error border and error text.
error-textstring—Message displayed when error is true.
helpstring—Helper text below the control.

Slots

NameDescription
supporting-textRich helper content below the field; error-text takes precedence when invalid.

Events

NameTypeDescription
inputInputEventFired on each edit, after value is updated.
changeEventFired when an edit is committed.
selectEventFired when text is selected.

CSS parts

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

NameDescription
textareaThe native textarea control.
supporting-textContainer wrapping the supporting-text slot or generated help and validation fallback.

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-textarea
c2-textarea > container
--c2-textarea__container--min-heightpixel80px
--c2-textarea__container--paddingpadding10px 12px
--c2-textarea__container--borderborder1px solid #bcbcc6
--c2-textarea__container--border-radiusborder-radius6px
--c2-textarea__container--backgroundcolor#ffffff
--c2-textarea__container--colorcolor#18181b
--c2-textarea__container--font-familyfont-familyinherit
--c2-textarea__container--font-sizefont-size14px
--c2-textarea__container--line-heightpixel20px
c2-textarea > container > hover
--c2-textarea__container__hover--borderborder1px solid #a1a1aa
c2-textarea > container > focus
--c2-textarea__container__focus--borderborder1px solid #476ef9
--c2-textarea__container__focus--outlineoutlinenone
c2-textarea > container > error
--c2-textarea__container__error--borderborder1px solid #dc2626
c2-textarea > container > error > focus
--c2-textarea__container__error__focus--outlineoutlinenone
c2-textarea > container > read-only
--c2-textarea__container__read-only--backgroundcolor#fafafa
c2-textarea > container > disabled
--c2-textarea__container__disabled--opacityopacity0.38
c2-textarea > placeholder
--c2-textarea__placeholder--colorcolor#71717a
c2-textarea > supporting-text
--c2-textarea__supporting-text--gappixel4px
--c2-textarea__supporting-text--font-sizefont-size12px
--c2-textarea__supporting-text--line-heightpixel16px
--c2-textarea__supporting-text--colorcolor#71717a
c2-textarea > supporting-text > error
--c2-textarea__supporting-text__error--colorcolor#dc2626
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schema or your own markup.InputsJSON ViewerBrowse a JSON value as a collapsible tree, search it, and copy any path or value.Editors & viewersKanbanBoard layout and card movement by pointer or keyboard, with cards drawn by your own renderItem.PlanningKbdKeyboard key label for shortcuts and command hints, with the semantics of the native kbd element.Data displayKey Value EditorEditable KEY=value rows for environment variables and headers: paste a .env file to split it into rows, mask secret values, and flag duplicate or malformed keys.InputsLabelCaption that names and activates the control referenced by its for attribute, with a required marker.InputsLine chartA line chart over a time or numeric x axis, drawn on canvas by uPlot, with series declared as children.ChartLink ButtonText-styled control for link and navigation actions, rendered as a real anchor or a button.NavigationListVertical list container with single or multiple selection.Data displayList ItemSelectable row with icon slots, used on its own or as the option of list and select.Data displayLoading OverlayCovers a region while it loads: the content stays in place, dimmed and blocked, with a spinner and an announced label.FeedbackLog ViewerExplore large logs with variable-height virtual scrolling and sticky tabular attributes.Editors & viewersMap chartA choropleth and point map on vector outlines, drawn by ECharts: regions shaded by a value, with layers of sized points and flow lines, on the bundled world and US maps or your own GeoJSON, TopoJSON or SVG.ChartMarkdownSafe markdown renderer that streams: chat answers and READMEs, with code, math and diagrams.ChatMarkerAn inline marker that highlights, underlines, strikes through, boxes or circles a run of text.Data displayMask InputA text input that fits what is typed to a pattern, for postcodes, IBANs, tax IDs, expiry dates and other fixed formats.InputsMasonryAutomatically pack differently sized dashboard tiles, then move or resize them in edit mode.LayoutMaster DetailA list beside the record it opens, one pane at a time with a Back step when the element is narrow.LayoutMathTeX formulas rendered as native MathML: no font CSS, readable by screen readers, safe for untrusted input.Data displayMenuCommands, links, checkboxes and submenus in a popover anchored to a trigger.NavigationMenubarDesktop-style File, Edit and View menus in one bar, with the arrow-key and hover movement of an application menu bar.NavigationMermaidMermaid text diagrams drawn in your theme colours, loaded on demand and safe for untrusted sources.Data displayMeterA measurement inside a known range — storage, quota, strength — with native meter thresholds and an optional segmented breakdown.Data displayModalDialog built on the native dialog element: focus trap, backdrop, Escape, title, body and footer.FeedbackMoney InputCurrency amount field that groups digits as you type, follows the locale and stores an integer count of minor units.InputsMonth PickerPick a month, or a year: billing periods, reports and card expiry.InputsMonth PlannerMonth calendar that draws events and trips as bars across the days they cover.PlanningNavigation MenuSite navigation bar whose triggers open panels of links below the header.NavigationNotepadA rich-text notepad that looks like paper: handwriting on ruled lines, a formatting toolbar over the selection, checklists and tear-off pages.PlanningNotification CenterAn inbox panel of notifications grouped by day, with read and unread states and mark all as read.FeedbackNumber InputForm-associated numeric input with native validation, step controls, adornments and helper states.InputsOrg ChartA hierarchy drawn as connected cards that collapse and expand: an organization chart, a reporting line or a team structure.Data displayOTP InputForm-associated one-time-code field with one cell per character, paste and SMS autofill, grouping and masking.InputsOverflow ListOne row of actions or links that shows what fits and folds the rest into a "More" menu, refitting as its width changes.LayoutOverlap chartA Venn diagram of two or three sets, where each circle is a set and each shared area counts the members of exactly that combination.ChartOverlayAnchored popup built on the browser Popover API, positioned with floating-ui.FeedbackPage EditorA Notion-style editor for long text: Markdown shortcuts while you type, a / menu for blocks, a toolbar over selected text, code blocks with syntax colours and eight named colours.Editors & viewersPage HeaderThe top of a page: breadcrumb or parent link, your heading with status badges, description, metadata, page actions that fold into a menu, tabs and a toolbar.LayoutPaginationPage navigation in three layouts: numbered pages, a simple page status, or a table-footer row with rows-per-page.NavigationPassword FieldA password input with a show/hide toggle, a strength meter, a requirements checklist and a Caps Lock warning.InputsPhone InputA phone number field with a searchable 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relationships, clusters and outliers across two numeric measures.ChartSearch FieldA search box with a debounced search event, a clear button, a keyboard shortcut hint and recent searches.InputsSecret FieldShows an API key or other secret masked, with buttons to reveal it, copy it and ask for a new one.InputsSelectDropdown that pairs a themeable trigger with an anchored list of c2-list-item options.InputsSeparatorHorizontal or vertical rule with an optional label, for dividing content and toolbars.LayoutSheetDialog pinned to an edge of the screen, for content that complements the page rather than interrupting it.FeedbackShortcutKeyboard shortcuts for a whole application from one element: each binding fires an action event, runs a handler or activates a target.InputsSide NavResponsive navigation drawer beside the page: pushes the content on large screens, slides over it with a backdrop on small ones.NavigationSkeletonPlaceholder block standing in for content that has not arrived, in 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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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