c2n/web-componentsv1.0.26
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Order Book

Live bids and asks with depth bars, price grouping and a spread row, for a trading screen.

Attributes

NameTypeDefaultDescription
bidsreadonly OrderBookLevelInput[][]The buy side, best first or in any order: a snapshot that replaces the bids.
asksreadonly OrderBookLevelInput[][]The sell side, in any order: a snapshot that replaces the asks.
layout'stacked' | 'split'stackedAsks over bids with the spread between (stacked), or bids and asks side by side (split).
depthnumber10Levels drawn on each side.
groupnumber0The price step levels are merged into: bids round down to it, asks round up. 0 shows every price.
groupsstring[][]Price steps the reader may pick from in the header, as a ; list ("0.01;0.1;1;10").
basestring—The traded asset, for the size header: "Size (BTC)".
quotestring—The pricing asset, for the price header: "Price (USD)".
price-precisionnumber | undefined—Fraction digits of prices. Without it: the group step's, else the most the data has.
size-precisionnumber4Fraction digits of sizes and totals.
last-pricenumber | undefined—The last trade price, shown in the spread row with an arrow against the previous one. Without it: the mid price.
own-pricesstring[][]Prices the user has orders at, as a ; list: each gets a dot.
labelstring—The heading and accessible name.
loadingbooleanfalseShows a spinner and "Waiting for the book…" while the book is empty.
localestring—The locale numbers are formatted in. Without it: the nearest lang.

Events

NameTypeDescription
price-selectCustomEvent<{ side: 'bid' | 'ask'; price: number; size: number; total: number }>Fired when a row is clicked or Enter is pressed on it. Does not bubble.
group-changeCustomEvent<{ group: number }>Fired when the reader picks a price step in the header. Does not bubble.

CSS parts

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

NameDescription
headerThe heading and the price grouping picker.
spreadThe row between the two sides: the mid or last price and the spread.
rowEvery price level row.
emptyThe message shown while the book is empty or loading.

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-order-book
--c2-order-book--borderborder1px solid #e4e4e7
--c2-order-book--border-radiusborder-radius8px
--c2-order-book--backgroundcolor#ffffff
--c2-order-book--colorcolor#18181b
--c2-order-book--font-sizefont-size12px
--c2-order-book--font-familyfont-familyinherit
c2-order-book > divider
--c2-order-book__divider--borderborder1px solid #e4e4e7The lines under the header, around the spread row and between the sides.
c2-order-book > header
--c2-order-book__header--displaydisplayflexnone hides the heading and the grouping picker.
--c2-order-book__header--paddingpadding8px 12px
c2-order-book > title
--c2-order-book__title--font-sizefont-size14px
--c2-order-book__title--font-weightfont-weight600
c2-order-book > grouping
--c2-order-book__grouping--widthpixel96pxWidth of the price grouping picker.
c2-order-book > column-header
--c2-order-book__column-header--colorcolor#71717a
c2-order-book > row
--c2-order-book__row--heightpixel20px
--c2-order-book__row--padding-inlinepixel12px
c2-order-book > row > hover
--c2-order-book__row__hover--backgroundcolor#f4f4f5
c2-order-book > row > focus
--c2-order-book__row__focus--outlineoutline2px solid rgba(2, 101, 220, 0.4)
c2-order-book > bid
--c2-order-book__bid--colorcolorlight-dark(#166534, #4ade80)Bid prices; the bid bars and flashes are mixed from it. The light and dark values keep 4.5:1 on the bars.
c2-order-book > ask
--c2-order-book__ask--colorcolorlight-dark(#b91c1c, #f87171)Ask prices; the ask bars and flashes are mixed from it. The light and dark values keep 4.5:1 on the bars.
c2-order-book > bid-bar
--c2-order-book__bid-bar--backgroundcolorcolor-mix(in srgb, var(--c2-order-book__bid--color, light-dark(#166534, #4ade80)) 14%, transparent)The depth bars of the bids.
c2-order-book > ask-bar
--c2-order-book__ask-bar--backgroundcolorcolor-mix(in srgb, var(--c2-order-book__ask--color, light-dark(#b91c1c, #f87171)) 14%, transparent)The depth bars of the asks.
c2-order-book > flash
--c2-order-book__flash--durationduration600ms
c2-order-book > flash > up
--c2-order-book__flash__up--backgroundcolorcolor-mix(in srgb, var(--c2-order-book__bid--color, light-dark(#166534, #4ade80)) 20%, transparent)A level whose size grew.
c2-order-book > flash > down
--c2-order-book__flash__down--backgroundcolorcolor-mix(in srgb, var(--c2-order-book__ask--color, light-dark(#b91c1c, #f87171)) 20%, transparent)A level whose size shrank.
c2-order-book > own
--c2-order-book__own--sizepixel4pxThe dot after a price the user has an order at.
c2-order-book > spread
--c2-order-book__spread--backgroundcolor#fafafa
--c2-order-book__spread--paddingpadding6px 12px
c2-order-book > spread > price
--c2-order-book__spread__price--font-sizefont-size16px
--c2-order-book__spread__price--font-weightfont-weight600
c2-order-book > spread > label
--c2-order-book__spread__label--colorcolor#71717a
c2-order-book > empty
--c2-order-book__empty--min-heightpixel160px
--c2-order-book__empty--colorcolor#71717a

Text and languages

The text the component shows, in English. It shows another language when the app adds one with addTranslations, under order-book, 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
labelOrder book—
asksAsks—
bidsBids—
pricePrice—
priceInPrice ({0}){0} quote
sizeSize—
sizeInSize ({0}){0} base
totalTotal—
bidBid—
askAsk—
groupingPrice grouping—
spreadSpread {0} ({1}){0} value
{1} percent
midMid price—
lastLast price—
ownyour order—
loadingWaiting for the book…—
emptyNo orders—
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required ones, then preview the rows with their errors.InputsIn ViewReacts when its content scrolls into view: reveal it, load more, or pause it when it leaves.LayoutIndicatorSolid dot or count pinned to an edge or corner of any element, with an accessible name for the count.Data displayInline EditText that turns into a field on click: Enter (Ctrl/⌘+Enter when multiline) commits, Escape cancels, and any control with a value that fires change can be the editor.InputsJSON FormA form generated from a JSON Schema, laid out by the schema, a UI 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.InputsKeypadA phone-style numeric keypad that types an amount, fills PIN dots or drives another field, with a slot for a biometric key.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, as the option of list and select, or as a navigation link with collapsible groups.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 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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.NavigationPan ZoomA viewport that pans and zooms its content: an image, an SVG diagram, a 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as wide as what it carries.ChartSave BarA floating bar that appears while a form has unsaved changes, with Discard and Save.LayoutScatter chartAn ECharts scatter plot for finding relationships, clusters and outliers across two numeric measures.ChartSchedulerResource timeline: people, rooms or machines down the side, time across the top, each booking a bar you can drag.PlanningScroll AreaA scroll container with themed scrollbars and shadows on the edges with more content beyond them.LayoutScroll ProgressHow far the reader got: a bar that fills or a ring that closes as the page or a container scrolls.FeedbackSearch 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.InputsSelection ToolbarA toolbar that appears over the text a reader selects: Ask AI, Comment, Bold, or any action the app slots in.Editors & viewersSeparatorHorizontal or vertical rule with an optional label, for dividing content and toolbars.LayoutShare SheetShare a link anywhere: copy it, send it to email or a network, scan it as a QR code, or hand it to the device’s own share sheet.FeedbackSheetDialog 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.NavigationSignature PadA box to sign in with a mouse, a pen or a finger, with undo and clear, that exports the signature as SVG or an image.InputsSkeletonPlaceholder block standing in for content that has not arrived, in three shapes and three animations.FeedbackSkip LinkA "Skip to main content" link that appears when a keyboard user tabs onto it and moves focus into the main content.NavigationSliderRange input with a themeable track, thumb, step ticks and value bubble.InputsSparklineA chromeless trend line sized for a table cell, a list row or the trend slot of a c2-stat.ChartSpinnerCircular progress indicator, indeterminate or showing a value, with optional text.FeedbackSplit ButtonA main action with a caret menu of alternatives, such as "Send ▾", or a remembered choice like a merge method.ButtonsSplit PanelTwo panels separated by a divider the user drags, or moves with the keyboard, to resize them.LayoutSpreadsheetA small editable grid with basic formulas, for budgets, quotes, price lists and score sheets.Editors & viewersStatDisplays a KPI with an optional icon, trend and supporting description.Data displayState TimelineOne band per series, coloured by the discrete state it was in over time: service health, CI runs, host power.ChartStatus LightColoured dot plus a short label for the state of something, such as Live, Building or Failed.Data displayStatus PanelCommunicate empty states, operation outcomes and recoverable errors with clear next steps.FeedbackStepsThe trace of a task as it runs, or a stepper across the top of a view: statuses, durations, stages that open while they work, and steps the reader can select.Data displayStickyPins content to the top or bottom of its scroll container and tells you when it is stuck, optionally hiding it while the reader scrolls down.LayoutStreaming TextPlain text that arrives in bursts, such as an LLM answer, revealed at a steady pace behind a caret.ChatSunburst chartA hierarchy drawn as rings, the whole at the centre and each ring splitting its parent: budgets, disk usage and org spend, with click to zoom.ChartSwipe ActionA list row that slides sideways to reveal actions behind it, as in a mail or task list on a phone.LayoutSwitchOn/off toggle on a native switch input, with label, description and thumb icons.InputsTableVirtualized data grid with declarative columns, sorting, selection, pinning and resizing.Data displayTable Of ContentsAn "On this page" navigation that lists the headings of a document, nests them by level and highlights the section being read.NavigationTabsTab strip that shows one content panel at a time.NavigationTag InputTurns typed or pasted text into removable tags — recipients, keywords, labels — with configurable delimiters, parsing and validation.InputsTerminalAn interactive prompt for commands your app answers: history, Tab completion, streaming output, Ctrl+C, ANSI colours.Editors & viewersText EffectAnimated text for a hero line or a status: rotating words, a typewriter, a scramble, a shimmer or a staggered reveal.Data displayText FieldSingle-line input with icon slots, clear button, helper and error text, and a character counter.InputsTextareaMultiline text input with resizing, helper and error text, and a character counter.InputsTheme SelectColour-theme switcher: click to step to the next mode, hover for the full menu.InputsTime InputForm-associated time-of-day input with a scroll-wheel picker, step and range constraints, helper text and error states.InputsTime Range PickerDashboard time range control: searchable quick ranges, an absolute range typed or picked on a calendar, time zone, shift and zoom, and auto-refresh.InputsTime Slot PickerPick a free time from someone's calendar: a row of days, then that day's times grouped into morning, afternoon and evening.InputsTimelineA vertical sequence of dated events on a connected rail: order history, activity feeds, changelogs.Data displayToastNotification cards and a manager for stacked, queued notifications with independent lifetimes.FeedbackTodo ListA to-do list with the feel of paper: hand-drawn ticks, notes, highlighters, swipe and drag, and a remembered look.PlanningToggletipA small ⓘ button that opens a help bubble on click or tap; the bubble can hold links and is announced to screen readers.FeedbackTooltipContextual hint shown when its target is hovered or focused, rendered in the top layer.FeedbackTourA guided product tour that spotlights one element at a time and explains it in a panel beside it.FeedbackTrace WaterfallShow the spans of a distributed trace as a tree, each with a duration bar on one shared time axis.Data displayTranscriptSpeaker-labelled, timestamped segments synced to playback: click to seek, the word playing marked, search built in.Data 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.InputsVideo GridLays out the tiles of a call as a grid, a spotlight or a sidebar, every tile as large as the space allows.LayoutVideo PlayerThemed controls over a real video: chapters on the seek bar, a thumbnail while scrubbing, captions, speed, picture-in-picture and full screen.Data displayVideo TileOne participant of a call: their video or avatar, with their name, a live microphone meter and status badges.Data displayView 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.PlanningWheel PickeriOS-style scroll wheels to pick a time, a height, a weight or any value from a short list, by swipe, scroll, click or keys.InputsWorking 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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