JavaScript Top Menu

@lemonadejs/topmenu · ✓ 4 contract checks · framework-agnostic · zero dependencies

<Topmenu /> — a horizontal menu bar, composed ON the Contextmenu block exactly like v5 ( inside the topmenu template): each top item with a submenu opens one shared Contextmenu right under itself. Ported faithfully from the v5 plugin:

• mousedown on a titled item toggles its dropdown (same item closes, another item switches)
• while the menu is open, hovering another top item moves the open dropdown to it (menubar behavior)
• keyboard: ArrowLeft/ArrowRight walk enabled items (wrapping, skipping disabled); with the menu open they move the OPEN dropdown; Enter or Space toggles, ArrowDown/ArrowUp open the submenu. Up/Down/Enter/ Escape inside the dropdown belong to the composed Contextmenu — closing it lands focus back on the menubar item
• focusin selects the focused item; focusout of the whole bar clears the selection highlight (the remembered index survives, as in v5)
• full ARIA: menubar / menuitem (the menubar directly owns its items), aria-haspopup, aria-expanded, aria-label, roving tabindex (one tab stop for the bar; disabled items unreachable)

v5 → v6 mapping: options keeps the v5 item model ({ title, submenu, disabled }; submenu items are Contextmenu items). self.open(index) → api.open(index). api.close() is new — the inner Contextmenu ref is private in v6, so a programmatic dismiss needs a surface.

Example

live

LemonadeJS

import { html } from 'lemonadejs';
import Topmenu from '@lemonadejs/topmenu';

const App = (props, { state }) => {
    const action = state('nothing yet');
    const pick = (name) => () => (action.value = name);

    const options = [
        { title: 'File', submenu: [
            { title: 'New', icon: 'note_add', shortcut: 'Ctrl+N', onclick: pick('File > New') },
            { title: 'Open', icon: 'folder_open', shortcut: 'Ctrl+O', onclick: pick('File > Open') },
            { type: 'line' },
            { title: 'Export', icon: 'ios_share', submenu: [
                { title: 'As CSV', onclick: pick('Export > CSV') },
                { title: 'As PDF', onclick: pick('Export > PDF') },
            ] },
        ] },
        { title: 'Edit', submenu: [
            { title: 'Copy', icon: 'content_copy', shortcut: 'Ctrl+C', onclick: pick('Edit > Copy') },
            { title: 'Paste', icon: 'content_paste', shortcut: 'Ctrl+V', onclick: pick('Edit > Paste') },
            { title: 'Delete', icon: 'delete', disabled: true },
        ] },
        { title: 'Help', submenu: [{ title: 'About', icon: 'info', onclick: pick('Help > About') }] },
    ];

    return html`<div>
        <${Topmenu} options="${options}" />
        <p>Last action: <b>${action}</b></p>
    </div>`;
};

Installation

npm install @lemonadejs/topmenu

import Topmenu from '@lemonadejs/topmenu';
import '@lemonadejs/topmenu/style.css';

Three deployment forms, one component:

html`<${Topmenu} />`                       // by value (no registration)
setComponents({ Topmenu });               // then <Topmenu /> by name anywhere
createWebComponent(Topmenu);              // <lm-topmenu> in plain HTML/any framework

Props

Every declared prop arrives as a live state — pass a value for a snapshot or a state for a two-way live wire. Attribute strings are coerced to the declared type.

API

import { ref } from 'lemonadejs';
const topmenu = ref();
html`<${Topmenu} ref="${topmenu}" />`;
// topmenu.current.open(...)  ·  topmenu.current.close(...)

• open()
• close()

Styling

All classes follow the lm-topmenu-* convention; visual variants are data-* attributes on the root. Override freely — there is no styling engine to fight.

Contract

The machine-readable schema ships with the package:

import contract from '@lemonadejs/topmenu/contract.json';

verify.json carries the conformance proof produced by verify(Topmenu).

Looking for the v5 plugin? See the archived v5 documentation.