c2n/web-componentsv1.0.18
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OverviewGetting startedComponentsIconsGuidesExamples
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Menubar

Desktop-style File, Edit and View menus in one bar, with the arrow-key and hover movement of an application menu bar.

c2-menubar

A desktop-style menu bar: File, Edit, View… as a row of c2-menubar-menu children, each a trigger and the c2-menu it opens. The bar is one Tab stop; the arrow keys move across it, and once a menu is open, hovering another trigger or pressing ArrowLeft/ArrowRight inside the menu moves the open menu with it, the way an application's menu bar does (WAI-ARIA menubar pattern).

Keyboard on a trigger: ArrowLeft/ArrowRight go to the previous/next menu (wrapping, mirrored right-to-left), Home/End to the first/last, a letter to the next menu whose label starts with it; Enter, Space or ArrowDown open the menu on its first row, ArrowUp on its last. Inside a menu, ArrowRight opens a submenu or, on a plain row, moves to the next menu; ArrowLeft closes a submenu or, at the top level, moves to the previous menu; Escape closes the menu and returns focus to its trigger.

The start and end slots hold what sits beside the menus (an app icon, a document title, a "Saved" status); they are outside the menubar role. Activated rows fire menu-select, which bubbles from the row through the bar.

Attributes

NameTypeDefaultDescription
aria-labelstring | nullnullAccessible name of the menu bar ("Application", "Document").

Slots

NameDescription
defaultThe menus: c2-menubar-menu elements.
startContent before the menus, outside the menubar role (a logo or app icon).
endContent after the menus, outside the menubar role (a title, status or actions).

Events

NameTypeDescription
menu-selectCustomEvent<MenuSelectEventDetail>Bubbles from an activated row: detail.value, detail.checked and detail.data of that row.

CSS parts

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

NameDescription
menusThe element with the menubar role that holds the menus.

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-menubar
--c2-menubar--gappixel8pxSpace between the start slot, the menus and the end slot.
--c2-menubar--menus-gappixel2pxSpace between two triggers.
--c2-menubar--background-colorcolor#ffffff
--c2-menubar--borderborder1px solid #e4e4e7
--c2-menubar--border-radiusborder-radius8px
--c2-menubar--box-shadowbox-shadownone
--c2-menubar--padding-toppadding4px
--c2-menubar--padding-rightpadding4px
--c2-menubar--padding-bottompadding4px
--c2-menubar--padding-leftpadding4px

c2-menubar-menu

One menu of a c2-menubar: a trigger labelled label ("File", "Edit", …) and the rows it opens. The trigger is a native button with the menuitem role, and the menu is a c2-menu anchored under it, so the rows are everything a c2-menu takes: c2-menu-item children (checkbox and radio rows, shortcuts, descriptions, submenus), <hr> separators and <h1>–<h6> group headings.

Keyboard and pointer movement across the bar belong to the c2-menubar around it; on its own the element behaves like a menu button (Enter, Space or ArrowDown open on the first row, ArrowUp on the last, Escape closes).

Attributes

NameTypeDefaultDescription
labelstring—The trigger's text, which is also its accessible name.
openbooleanfalseWhether the menu is showing. Set it to open or close the menu from code.
disabledbooleanfalseLeaves the trigger focusable and announced but never opens the menu; the bar's arrow keys skip it.
placementPlacementbottom-startPreferred placement of the menu (floating-ui names); it flips near the viewport edge.
menu-labelstring—Accessible name of the menu surface. Defaults to the trigger's name.

Slots

NameDescription
defaultThe rows: c2-menu-item elements, <hr> separators and <h1>–<h6> group headings.

Events

NameTypeDescription
menu-selectCustomEvent<MenuSelectEventDetail>Bubbles from the activated row (from c2-menu-item, unchanged).
toggleToggleEventThe menu opened or closed; newState is open or closed.

CSS parts

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

NameDescription
triggerThe native button that opens the menu.

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-menubar-menu
c2-menubar-menu > trigger
--c2-menubar-menu__trigger--heightpixel28px
--c2-menubar-menu__trigger--padding-leftpadding10px
--c2-menubar-menu__trigger--padding-rightpadding10px
--c2-menubar-menu__trigger--border-radiusborder-radius6px
--c2-menubar-menu__trigger--font-sizefont-size14px
--c2-menubar-menu__trigger--font-weightfont-weight—
--c2-menubar-menu__trigger--font-familyfont-family—
--c2-menubar-menu__trigger--colorcolor#18181b
--c2-menubar-menu__trigger--background-colorcolortransparent
c2-menubar-menu > trigger > hover
--c2-menubar-menu__trigger__hover--background-colorcolor#f4f4f5
--c2-menubar-menu__trigger__hover--colorcolor—
c2-menubar-menu > trigger > open
--c2-menubar-menu__trigger__open--background-colorcolor#f4f4f5
--c2-menubar-menu__trigger__open--colorcolor—
--c2-menubar-menu__trigger__open--font-weightfont-weight—
c2-menubar-menu > trigger > focus
--c2-menubar-menu__trigger__focus--outlineoutline2px solid rgba(2, 101, 220, 0.4)
--c2-menubar-menu__trigger__focus--outline-offsetpixel0px
c2-menubar-menu > trigger > disabled
--c2-menubar-menu__trigger__disabled--opacitynumber0.38
c2-menubar-menu > menu
--c2-menubar-menu__menu--offsetpixel4pxGap between the trigger and its menu.
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