c2n/web-componentsv1.0.26
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Barcode Scanner

Reads barcodes and QR codes with the camera: a scan window, single or continuous scanning, a beep, the camera light, and a scan event with the value and the format.

Attributes

NameTypeDefaultDescription
formatsstring[][]The formats to read, as BarcodeDetector names them: qr_code, ean_13, ean_8, upc_a, upc_e, code_128, code_39, code_93, codabar, itf, data_matrix, aztec, pdf417. As an attribute, separated by ;. Empty reads every format the decoder knows.
continuousbooleanfalseKeeps the camera open after a code is read and fires scan for each new one, instead of stopping at the first.
repeat-delaynumber1500In continuous mode, how long in milliseconds a code must be out of the picture before reading it again fires scan again. A code that stays in the window fires once.
beepbooleanfalseSounds a short beep when a code is read.
torchbooleanfalseThe camera's light. It only turns on while the camera is open and has one; the light button toggles it.
facingCameraFacingenvironmentThe camera to open: environment (the back one, the default) or user (the front one). Switching camera updates it.
autostartbooleanfalseOpens the camera as soon as the element is on the page, without waiting for the Start camera button.
labelstring—The accessible name of the component. Empty uses the built-in "Barcode scanner".

Slots

NameDescription
idleReplaces the screen shown before the camera starts (an icon, a sentence and the Start camera button). Call start() from your own button.
errorReplaces the screen shown when the camera or the decoder cannot start. Read the reason from the camera-error event.
windowReplaces the drawing of the scan window; the window's box (part="window") stays, and is the area that is read.
doneReplaces the screen shown once a code is read (its value, its format and the Scan again button). Read the code from the scan event.
torch-iconReplaces the icon of the light button.
switch-iconReplaces the icon of the Switch camera button.
actionsAction zone under the picture, for the app's own commands: type the code instead, read a picture of it (scanImage()), cancel. The events do not bubble: listen on the element itself.

Events

NameTypeDescription
camera-startCustomEvent<{ facing: 'user' | 'environment' }>Fired when the camera shows its first picture.
camera-errorCustomEvent<{ kind: 'denied' | 'not-found' | 'busy' | 'unsupported' | 'ended' | 'decoder' | 'unknown'; error: unknown }>Fired when the camera cannot start or stops while open, or (decoder) when nothing here can read a barcode.
scanCustomEvent<BarcodeScanResult>Fired when a code is read. detail.value is its text, detail.format its format (qr_code, ean_13…), detail.corners its corners in the camera frame when known.

CSS parts

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

NameDescription
stageThe dark box that holds the picture and the idle, error and done screens.
videoThe camera picture.
windowThe box of the scan window, wrapping the window slot and its default drawing; only its area is read.
frameThe default drawing of the scan window.
lineThe line that sweeps the scan window.
hintThe instruction over the picture.
resultThe last code read, over the picture, in continuous mode.
controlsThe bar under the picture.
actionsThe wrapper of the actions slot.
torchThe button that turns the camera's light on and off, shown when the camera has one. It wraps the torch-icon slot: the built-in icon shows as the slot's fallback, and assigned content replaces it at the same size.
switchThe button that switches camera, shown when the device has more than one. It wraps the switch-icon slot: the built-in icon shows as the slot's fallback, and assigned content replaces it at the same size.
buttonThe Start camera, Try again and Scan again buttons.
idleThe region of the idle screen, wrapping the idle slot and its default content.
errorThe region of the error screen, wrapping the error slot and its default content.
doneThe region of the done screen, wrapping the done slot and its default content.
valueThe value of the code on the done screen.
formatThe format of the code on the done screen.

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-barcode-scanner
--c2-barcode-scanner--widthlength480pxWidth of the component, never wider than its container; 100% fills it.
c2-barcode-scanner > stage
--c2-barcode-scanner__stage--aspect-ratioaspect-ratio4 / 3Shape of the picture; the camera is cropped to fill it.
--c2-barcode-scanner__stage--backgroundbackground#18181bBehind the picture, and of the idle, error and done screens. Dark in both themes, like a viewfinder.
--c2-barcode-scanner__stage--colorcolor#fafafaText on the stage.
--c2-barcode-scanner__stage--border-radiusborder-radius8px
c2-barcode-scanner > stage > muted
--c2-barcode-scanner__stage__muted--colorcolor#a1a1aaSecondary text on the stage.
c2-barcode-scanner > window
--c2-barcode-scanner__window--widthlength70%The most of the stage's width the scan window takes. The window keeps its shape and fits both this and the height.
--c2-barcode-scanner__window--heightlength70%The most of the stage's height the scan window takes.
--c2-barcode-scanner__window--aspect-rationumber1Width over height, as a number: 1 suits a QR code, about 2.4 a 1D barcode.
--c2-barcode-scanner__window--border-radiusborder-radius14px
--c2-barcode-scanner__window--border-widthpixel3px
--c2-barcode-scanner__window--border-colorcolor#ffffff
c2-barcode-scanner > window > found
--c2-barcode-scanner__window__found--border-colorcolor#16a34aThe window just after a code is read.
c2-barcode-scanner > window > scrim
--c2-barcode-scanner__window__scrim--colorcolorrgba(0, 0, 0, 0.45)Darkens the picture outside the window.
c2-barcode-scanner > line
--c2-barcode-scanner__line--colorcolor#ef4444The line that sweeps the window.
--c2-barcode-scanner__line--heightpixel2px
--c2-barcode-scanner__line--durationtime2sOne sweep down and back. The line stands still under reduced motion.
--c2-barcode-scanner__line--displaydisplayblocknone hides the line.
c2-barcode-scanner > hint
--c2-barcode-scanner__hint--backgroundbackgroundrgba(24, 24, 27, 0.72)Of the instruction and of the last code read.
--c2-barcode-scanner__hint--colorcolor#fafafa
--c2-barcode-scanner__hint--font-sizefont-size14px
--c2-barcode-scanner__hint--border-radiusborder-radius999px
--c2-barcode-scanner__hint--displaydisplayblocknone hides the instruction.
c2-barcode-scanner > result
--c2-barcode-scanner__result--backgroundbackgroundrgba(21, 128, 61, 0.92)The last code read, in continuous mode.
c2-barcode-scanner > screen
--c2-barcode-scanner__screen--font-sizefont-size14pxText of the idle, starting and error screens.
c2-barcode-scanner > value
--c2-barcode-scanner__value--font-sizefont-size18pxThe value on the done screen.
--c2-barcode-scanner__value--font-weightfont-weight600
--c2-barcode-scanner__value--font-familyfont-familyui-monospace, SFMono-Regular, Menlo, Consolas, monospace
c2-barcode-scanner > done
c2-barcode-scanner > done > icon
--c2-barcode-scanner__done__icon--colorcolor#4ade80The check of the done screen.
c2-barcode-scanner > controls
--c2-barcode-scanner__controls--paddinglength12px 0 0
--c2-barcode-scanner__controls--gaplength12px
c2-barcode-scanner > switch
--c2-barcode-scanner__switch--sizepixel40pxThe light and Switch camera buttons.
c2-barcode-scanner > torch
c2-barcode-scanner > torch > on
--c2-barcode-scanner__torch__on--backgroundbackground#fde047The light button while the light is on.
--c2-barcode-scanner__torch__on--colorcolor#18181b
c2-barcode-scanner > button
--c2-barcode-scanner__button--backgroundbackground#ffffff
--c2-barcode-scanner__button--colorcolor#18181b
--c2-barcode-scanner__button--borderborder1px solid #bcbcc6
--c2-barcode-scanner__button--border-radiusborder-radius6px
--c2-barcode-scanner__button--heightpixel36px
--c2-barcode-scanner__button--font-sizefont-size14px
--c2-barcode-scanner__button--font-weightfont-weight500
c2-barcode-scanner > button > hover
--c2-barcode-scanner__button__hover--backgroundbackground#f4f4f5
c2-barcode-scanner > accept
--c2-barcode-scanner__accept--backgroundbackgroundrgb(2, 101, 220)The Start camera and Scan again buttons.
--c2-barcode-scanner__accept--colorcolor#ffffff
c2-barcode-scanner > accept > hover
--c2-barcode-scanner__accept__hover--backgroundbackgroundrgb(1, 84, 184)
c2-barcode-scanner > focus
--c2-barcode-scanner__focus--outlineoutline2px solid rgba(2, 101, 220, 0.4)

Text and languages

The text the component shows, in English. It shows another language when the app adds one with addTranslations, under barcode-scanner, 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
labelBarcode scanner—
idleScan a barcode or a QR code with your camera.—
startStart camera—
startingStarting the camera…—
hintPoint the camera at a code.—
scannedScanned: {0}{0} value
scanAgainScan again—
torchLight—
switchCameraSwitch camera—
errorDeniedCamera access was denied. Allow it in the browser settings, then try again.—
errorNotFoundNo camera was found on this device.—
errorBusyThe camera is in use by another application.—
errorUnsupportedThis browser cannot use a camera on this page.—
errorEndedThe camera stopped. Check that it is connected, then try again.—
errorDecoderBarcodes cannot be read in this browser.—
errorUnknownThe camera could not start.—
retryTry again—
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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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