c2n/web-componentsv1.0.18
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OverviewGetting startedComponentsIconsGuidesExamples
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Heatmap chart

Rows binned into cells by two keys, aggregated, and coloured by a sequential, diverging or stepped scale: a currency matrix, pair × tenor, hour × weekday, or a calendar of days. Drawn by ECharts, with a colour key that counts, marks and filters.

The figures in these examples are generated for illustration, not real trading or market data.

Import

import '@c2n/components/chart/heatmap-chart'

This chart draws with ECharts, a peer dependency it loads on first draw: npm install echarts.

Usage

A heatmap is one idea in three layouts. Rows are put into cells by two keys, the rows that share a cell are combined by aggregate, and each cell is coloured by its value. A calendar is one way to get the two keys, from a date; any two fields are others: a currency against a currency, a pair against a tenor, an hour against a weekday.

layoutKeysTypical use
grid (the default)x-field columns × y-field rowsCross-currency moves, implied vol by tenor, cohort retention, a correlation matrix
calendardate-field: a column per week, a row per weekday, labelled by monthDaily P&L, contributions, incidents per day
calendar-monthdate-field: one month grid per month, with day numbers when there is roomDaily figures read by date: realized vol, bookings

Keys and order

x-bin and y-bin derive a key from a date field instead of reading it as it is: hour, weekday, day, week, month, quarter or year. One timestamp binned twice, x-bin="hour" and y-bin="weekday", is the general form of the calendar. A timestamp’s day and hour are read in the local time zone, or in UTC with time-zone="utc"; a plain YYYY-MM-DD date is that day in either.

x-order and y-order order the axes:

  • data: the order keys first appear in the rows (the default for a plain key);
  • natural or natural-desc: numeric-aware text order, or time order for a binned key (the default for one);
  • tenor: by maturity, so ON, TN, 1W, 1M, 3M, 1Y, 1Y6M, 10Y sort the way a curve reads, whatever order the quotes arrive in;
  • value-asc or value-desc: by each column’s or row’s total;
  • x (rows only): the rows mirror the columns, for a matrix;
  • a JSON list of keys, x-order='["USD", "EUR", "JPY"]', which also adds listed columns that have no rows.

group-field bands the rows into labelled groups, G10 and EM pairs or one desk per band, in group-order. diagonal="hide" blanks the cells whose two keys are equal, as a cross-currency matrix needs. marginals adds bars with each column’s total along the top (top), each row’s along the end (end), or both.

Aggregation

aggregate combines the rows that share a cell: sum (the default), mean, count, min, max, first or last. count needs no value-field. The marginal totals aggregate the rows of the whole column or row the same way, so a mean stays a mean of rows. The tooltip says how many rows a cell holds, and cell-click hands them over in detail.rows.

On the calendar layouts, range sets the span, a year (2026), months (2026-08/2026-10) or days, and every day in it without rows is drawn empty, in --c2-chart__cell__empty--background-color. Without range the span runs from the first day with rows to the last. weekdays="mon-fri" drops weekends, as trading days do; week-start="sunday" starts the weeks on Sunday.

Scales

The colour scale is the one c2-map-chart uses. scale="sequential" (the default) shades from --c2-chart__scale-start--color to --c2-chart__scale-end--color across the data’s extent. scale="diverging" runs from --c2-chart__scale-negative--color through --c2-chart__scale-mid--color to the end colour around 0, with a range symmetric around it, so a loss and a gain of the same size are equally strong. domain pins the ends, [min, max] or [min, mid, max], so two heatmaps can be compared; thresholds turns either scale into stepped classes, and scale-colors gives one colour per class.

The default diverging pair is orange and blue, which stay apart for readers with red-green colour blindness. A desk that expects green and red can set them with scale-colors, as the gallery’s gain and loss card does; keep the stepped key or the cell labels as a second cue.

Each cell’s value is written in it when it fits (cell-labels="auto"), on every cell (always), or never (none), in --c2-chart__cell-label--color on a light cell and --c2-chart__cell-label__inverse--color on a dark one. unit is appended to every value; format is the property for anything else.

The colour key

The built-in legend is the colour key, and by default (legend-detail="histogram") it does more than list colours:

  • bars above the scale count the cells in each band, so the reader sees how the values are spread before reading a single cell;
  • a stepped scale is labelled at the breaks between its classes, a continuous one at round values;
  • scale-poles names what each end means (["loss", "gain"]), and an arrow at an end shows that some values lie past the scale’s domain;
  • hovering a cell marks its value on the scale and counts the cells in its band;
  • hovering a band previews it, dimming the other cells; clicking keeps it, and on a continuous scale a drag keeps a range. The readout gives the count and, for a sum or a count, the total.

legend places the key: below the plot (bottom, the default), above it (top), or beside it (start or end, left and right in a left-to-right page), where the key stands upright with its low end at the bottom, as on a value axis, and its ends named above and below it. A square matrix leaves room at the side, as in the currency matrix above; --c2-chart__scale-key--height sets the upright key’s length.

legend-detail="simple" keeps the bar, its ticks and its ends. Each line of text can also be hidden on its own, through a CSS variable set to none:

VariableHides
--c2-chart__scale-key-title--displayThe key’s title
--c2-chart__scale-key-readout--displayThe line under the title: count, range, total, and the hovered cell’s value
--c2-chart__scale-key-total--displayOnly the total, for values that do not add up to anything (a mean, a rate, a % change)
--c2-chart__scale-key-hint--displayThe “hover a band…” line (always hidden beside the plot)
--c2-chart__scale-key-poles--displayThe names of the two ends

To show the heatmap alone, legend="none" removes the key and --c2-chart__axis-label--display: none removes the row, column, group and month labels, giving the cells the room they took: a compact calendar in a table row or a card, with the tooltip still naming each cell. cell-labels="none" clears the values from the cells too. A calendar keeps square cells, at most --c2-chart__cell--max-size on a side.

legend-interaction="preview" only previews, and none makes the key a plain picture. The kept range is scale-filter, [from, to) with null for an open end; the application can set it, to share one filter between two heatmaps, and scale-filter-change reports the reader’s changes. legend="none" hides the key.

Keyboard and events

The plot is one tab stop: the arrow keys move from cell to cell, a calendar’s left and right moving a week, Home and End go to the ends of the row, Enter fires cell-click and Escape leaves. The focused cell is announced, and a hidden table lists every cell with a value for screen readers. On the colour key, Tab reaches the bands, or the scale of a continuous key, where the arrow keys pick a band, Shift extends it, Enter keeps it and Escape clears it.

cell-hover and cell-click carry the cell’s keys, labels, value, row count and rows; the cells property lists every cell with rows, for a table or an export.

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The core of a ⌘K palette.NavigationComparison BarSegmented ratio bar comparing two or three quantities, such as the bid/ask balance of an order book.Data displayConfirm DialogAsks the user to confirm an action: await show() or confirm() for a true/false answer, with a destructive variant and an async confirm action.FeedbackContext MenuA menu opened by right-clicking or long-pressing an area, built from a slotted c2-menu or a render function per clicked spot.NavigationCopy ButtonButton that copies text to the clipboard — the element it sits in, another element by id, or a literal string.ButtonsCountdownTime left until a date, or through a timer, drawn as segments, a clock or a phrase, and kept current to the second.Data displayDashboardGrid of resizable panes, dragged by the edges they share.LayoutDate InputForm-associated single-date input with native picker, constraints, helper text and error states.InputsDate SelectorAccessible one- or two-month calendar for choosing a date range.InputsDate StripA row of days to pick one from, a week at a time, with dots on the days that have something on them.InputsDate Time PickerForm-associated date-and-time field with a calendar and time popup, min/max/step constraints and an IANA time zone.InputsDepth chartCumulative bid and ask size around the mid price of an order book, as trading screens show market depth.ChartDescription ListRead-only label and value pairs for a detail page, in columns that wrap with the available width.Data displayDetailsCollapsible disclosure built on native details and summary.LayoutDiff ViewerRead-only line diff of two texts, unified or side by side, with folded unchanged lines and word highlights.Editors & viewersDistribution BarOne 100% stacked bar of a breakdown, with a legend of shares and the hovered part brought forward.Data displayEmoji PickerA searchable grid of emoji in categories, with skin tones and the emoji used last.InputsFacet ListOne facet of a filter sidebar: an attribute’s values with counts, to include or exclude from a search.InputsFieldsetGroups related controls under a legend, with a description, a group-level error and a disabled state that reaches every control inside.InputsFilter BuilderA filter bar of sentence chips (Status is any of Active), an add-filter picker and an editor for each part; it reports a plain JSON filter tree.InputsFloat ButtonA floating action button for the main action of a screen, which can expand into a speed dial of related actions.ButtonsFlowA pipeline, dependency graph or database schema on a pannable canvas: steps with a status, smooth edges, rows joined row to row, auto layout, draggable nodes saved to localStorage, a hover card and a context menu.Editors & viewersFormForm container with validation timing, an error summary, server errors, dirty tracking and async submit.InputsForm FieldLabel, hint, error, warning and character counter around any form control, wired for assistive technology.InputsFormat DateA date and time formatted for the reader's language and, optionally, a fixed time zone.Data displayFormat NumberA number formatted for its locale: currency, percent, units, compact counts and byte sizes, from Intl.NumberFormat.Data displayGanttA read-only project timeline: tasks, groups, milestones and dependencies on a day, week or month scale.PlanningGauge chartA focused radial KPI gauge drawn by ECharts, with a configurable scale, progress arc and pointer.ChartGoogle MapGoogle Maps with markers, a road route from A to B, and Street View, loaded once per page from a browser key.Data displayHeaderArranges brand, navigation, actions and a mobile trigger in a reusable site shell.LayoutHeatmap chartRows binned into cells by two keys, aggregated, and coloured by a sequential, diverging or stepped scale: a currency matrix, pair × tenor, hour × weekday, or a calendar of days. 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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 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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.InputsText 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 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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