c2n/web-componentsv1.0.18
OverviewGetting startedComponentsIconsGuidesExamples
OverviewGetting startedComponentsIconsGuidesExamples
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Bottom Nav

The mobile tab bar: three to five destinations along the bottom of the screen, each an icon over a short label with a count or dot badge.

c2-bottom-nav

The mobile tab bar: three to five c2-bottom-nav-item destinations along the bottom of the screen, each an icon over a short label with an optional count or dot badge. It is a navigation landmark (named "Main" unless the host has an aria-label) of plain links or buttons, the current one announced with aria-current="page"; not a tab list, so every item is a normal tab stop.

Set value to the value of the item being shown, or mark that item current. Activating another item fires a cancelable item-select (cancelling it also stops the link, for an unsaved-changes guard), then updates value and fires change. Activating the current item again fires reselect, the place to scroll back to the top.

The host is position: sticky to the bottom by default, so as the last element of the page it stays on screen without covering the end of the content, and the bar is padded by env(safe-area-inset-bottom) for the home indicator. With hide-on-scroll it slides away while the page scrolls down and returns on scroll up, at the top or when focus moves into it. Every look (Material indicator, translucent glass, floating dock, top line) is a set of CSS variables.

Attributes

NameTypeDefaultDescription
valuestring—Value of the current item. Left empty, the item marked current when the bar first renders provides it, and so does an item that gets the current attribute later. Set it to '' for a page that is none of the items.
label-visibilityBottomNavLabelVisibilitylabeledWhich labels show: all (labeled), all up to three items and the current one from four (auto), the current one (selected) or none (unlabeled).
hide-on-scrollbooleanfalseSlides the bar away while the page scrolls down and brings it back on scroll up, at the top or on focus.
scroll-targetstring—Id of the element whose scrolling hide-on-scroll follows, looked up in the bar's document or shadow root when the attribute is set or the bar connects, so that element must exist by then. Empty: the window.

Slots

NameDescription
defaultThe c2-bottom-nav-item elements, three to five of them.

Events

NameTypeDescription
item-selectCustomEvent<BottomNavItemSelectEventDetail>An item other than the current one was activated. Cancelable: cancelling keeps value and stops a link from navigating.
changeEventvalue changed because an item was activated.
reselectCustomEvent<BottomNavReselectEventDetail>The current item was activated again.

CSS parts

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

NameDescription
barThe visible bar: background, border, radius, safe-area padding. It slides away with hide-on-scroll.

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-bottom-nav
--c2-bottom-nav--positionpositionstickyfixed pins it to the viewport wherever it sits in the page.
--c2-bottom-nav--z-indexnumber10
--c2-bottom-nav--backgroundbackground#ffffffA translucent colour with backdrop-filter gives the glass look.
--c2-bottom-nav--border-topborder1px solid #e4e4e7
--c2-bottom-nav--border-radiusborder-radius0px
--c2-bottom-nav--box-shadowbox-shadownone
--c2-bottom-nav--backdrop-filterbackdrop-filternoneSuch as blur(18px) saturate(1.6) over a translucent background.
--c2-bottom-nav--marginmargin0pxLifts the bar off the screen edges for a floating dock.
--c2-bottom-nav--max-widthpixelnone
--c2-bottom-nav--min-heightpixel64px
--c2-bottom-nav--padding-toppadding0px
--c2-bottom-nav--padding-rightpadding0px
--c2-bottom-nav--padding-bottompaddingenv(safe-area-inset-bottom, 0px)Keeps the items clear of the home indicator.
--c2-bottom-nav--padding-leftpadding0px
--c2-bottom-nav--gappixel0pxSpace between items.
c2-bottom-nav > away
--c2-bottom-nav__away--transformtransformtranslateY(calc(100% + 32px))Where hide-on-scroll moves the bar.
--c2-bottom-nav__away--transition-durationtime0.2sLength of that slide; reduced motion drops it.

Text and languages

The text the component shows, in English. It shows another language when the app adds one with addTranslations, under bottom-nav, 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
navigationLabelMain—
newCount{0} new{0} count
newActivitynew activity—

c2-bottom-nav-item

One destination of a c2-bottom-nav: an icon over a short label, with an optional count or dot badge. With an href it renders a link, otherwise a button. Mark the item of the page being shown current (or set the bar's value) to announce aria-current="page", show the indicator behind the icon and swap in the current-icon.

The badge is drawn with c2-badge and read as part of the item's name ("Inbox, 3 new", "Chat, new activity"), so a screen reader hears what a sighted user sees. A label hidden by the bar's label-visibility stays the name.

Attributes

NameTypeDefaultDescription
valuestring—Identifies the item for the bar's value. Falls back to href, then the label.
hrefstring | undefined—Makes the item a link.
targetstring | undefined—Browsing context used when href is set, such as _blank.
labelstring | undefined—Label used when the default slot is empty.
currentbooleanfalseThe item of the page being shown: announced as aria-current="page". Set by the bar from its value.
countnumber | undefinedundefinedNumber shown in a badge on the icon. 0 hides the badge.
maxnumber99Upper bound for count; larger values show as <max>+.
dotbooleanfalseShows a dot badge on the icon, read as "new activity". Ignored while count is shown.

Slots

NameDescription
defaultThe label. Falls back to label.
iconThe icon, sized by --c2-bottom-nav-item__icon--size.
current-iconOptional icon shown instead of icon while the item is current, such as a filled variant.

CSS parts

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

NameDescription
itemThe link or button: the whole touch target.
indicatorThe shape behind the icon that marks the current item, and the hover and pressed feedback.
labelThe label text.
badgeThe c2-badge drawn for count or dot.

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-bottom-nav-item
--c2-bottom-nav-item--flex-directionflex-directioncolumnrow puts the icon before the label, as on tablets.
--c2-bottom-nav-item--gappixel4pxSpace between the icon and the label.
--c2-bottom-nav-item--min-heightpixel48pxMinimum height of the touch target.
--c2-bottom-nav-item--padding-toppadding8px
--c2-bottom-nav-item--padding-rightpadding2px
--c2-bottom-nav-item--padding-bottompadding6px
--c2-bottom-nav-item--padding-leftpadding2px
--c2-bottom-nav-item--colorcolor#71717aIcon and label colour of an item that is not current.
--c2-bottom-nav-item--font-familyfont-familyinherit
--c2-bottom-nav-item--font-sizefont-size12px
--c2-bottom-nav-item--font-weightfont-weight500
--c2-bottom-nav-item--line-heightline-height16px
--c2-bottom-nav-item--letter-spacingpixel—
c2-bottom-nav-item > current
--c2-bottom-nav-item__current--colorcolorrgb(2, 101, 220)Icon and label colour of the current item.
--c2-bottom-nav-item__current--font-weightfont-weight600Label weight of the current item.
c2-bottom-nav-item > indicator
--c2-bottom-nav-item__indicator--widthpixel56px
--c2-bottom-nav-item__indicator--heightpixel32px
--c2-bottom-nav-item__indicator--border-radiusborder-radius999px
--c2-bottom-nav-item__indicator--backgroundbackgroundtransparentIndicator of an item that is not current.
--c2-bottom-nav-item__indicator--transition-durationtime0.2s
c2-bottom-nav-item > indicator > hover
--c2-bottom-nav-item__indicator__hover--backgroundbackground#f4f4f5Indicator under a hovering pointer.
c2-bottom-nav-item > indicator > active
--c2-bottom-nav-item__indicator__active--backgroundbackground#e4e4e7Indicator while pressed.
c2-bottom-nav-item > indicator > current
--c2-bottom-nav-item__indicator__current--backgroundbackground#edf1feIndicator of the current item. transparent for a tint-only look.
c2-bottom-nav-item > icon
--c2-bottom-nav-item__icon--sizepixel24pxAlso handed to slotted Feather and Phosphor icons.
c2-bottom-nav-item > line
--c2-bottom-nav-item__line--heightpixel0pxHeight of a line on the top edge of the current item; 3px for the top-line look.
--c2-bottom-nav-item__line--widthpixel50%Width of that line.
--c2-bottom-nav-item__line--border-radiusborder-radius0 0 3px 3px
c2-bottom-nav-item > line > current
--c2-bottom-nav-item__line__current--backgroundbackgroundrgb(2, 101, 220)
c2-bottom-nav-item > badge
--c2-bottom-nav-item__badge--toppixel0pxOffset of a count badge from the top of the indicator.
--c2-bottom-nav-item__badge--inset-inline-startpixelcalc(50% + 4px)Offset of a count badge from the start of the indicator.
--c2-bottom-nav-item__badge--box-shadowbox-shadow0 0 0 2px #ffffffRing around the badge, in the bar's background colour.
c2-bottom-nav-item > dot
--c2-bottom-nav-item__dot--toppixel3pxOffset of a dot badge from the top of the indicator.
--c2-bottom-nav-item__dot--inset-inline-startpixelcalc(50% + 7px)Offset of a dot badge from the start of the indicator.
c2-bottom-nav-item > focus
--c2-bottom-nav-item__focus--outlineoutline2px solid rgba(2, 101, 220, 0.4)Keyboard focus ring, drawn around the indicator.
--c2-bottom-nav-item__focus--outline-offsetpixel2px
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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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