Menu Button — Stimeo UI

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The stimeo--menu controller implements the WAI-ARIA Menu Button pattern: a button that opens a role=menu of commands with roving focus across role=menuitem children. Unlike stimeo--dropdown (a disclosure for arbitrary content), it manages arrow-key navigation, Home/End, and closes on Esc, Tab, outside click, or item activation. Static placement is owned by CSS; viewport-edge positioning is intentionally out of scope.

running

Keyboard

Key	Action
`Enter / Space / ↓`	Open the menu and focus the first item.
`↑`	Open the menu and focus the last item.
`↓ / ↑`	Move focus between items (wrapping).
`Home / End`	Focus the first / last item.
`Esc`	Close the menu and return focus to the trigger.

<%# Markup for the menu (APG Menu Button) demo.
    stimeo--menu is a full role="menu"/"menuitem" menu providing arrow-key roving
    focus, Esc, and outside click (distinct from the disclosure dropdown).
    Positioning (static placement) is the Playground's CSS. %>
<div class="menu" data-controller="stimeo--menu">
  <button
    type="button"
    class="menu__trigger"
    aria-haspopup="menu"
    aria-expanded="false"
    aria-controls="menu-list"
    data-stimeo--menu-target="trigger"
    data-action="click->stimeo--menu#toggle keydown->stimeo--menu#onTriggerKeydown">
    <%= t("components.menu.demo.trigger") %>
  </button>

  <%# role="menu". Each item is a role="menuitem" button (tabindex=-1). %>
  <ul id="menu-list" class="menu__list" role="menu" data-stimeo--menu-target="menu" hidden>
    <li role="none">
      <button type="button" role="menuitem" class="menu__item" tabindex="-1"
              data-stimeo--menu-target="item"
              data-action="click->stimeo--menu#activate
                           keydown->stimeo--menu#onItemKeydown"><%= t(
                "components.menu.demo.edit"
              ) %></button>
    </li>
    <li role="none">
      <button type="button" role="menuitem" class="menu__item" tabindex="-1"
              data-stimeo--menu-target="item"
              data-action="click->stimeo--menu#activate
                           keydown->stimeo--menu#onItemKeydown"><%= t(
                "components.menu.demo.duplicate"
              ) %></button>
    </li>
    <li role="none">
      <button type="button" role="menuitem" class="menu__item" tabindex="-1"
              data-stimeo--menu-target="item"
              data-action="click->stimeo--menu#activate
                           keydown->stimeo--menu#onItemKeydown"><%= t(
                "components.menu.demo.delete"
              ) %></button>
    </li>
  </ul>
</div>

/*
 * Presentation-only styles for the menu (Menu Button) demo.
 * Static placement (showing below the trigger) is this CSS's job. Dynamic collision
 * avoidance is not the library's responsibility (a future shared positioning module
 * will handle it).
 */

.menu {
  position: relative;
  display: inline-block;
}

.menu__trigger {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  cursor: pointer;
  border: 1px solid var(--border-interactive);
  border-radius: 0.375rem;
  background: var(--surface-card);
}

.menu__trigger[aria-expanded="true"] {
  border-color: var(--accent);
}

.menu__list {
  position: absolute;
  left: 0;
  margin: 0.25rem 0 0;
  padding: 0.25rem;
  list-style: none;
  min-width: 12rem;
  background: var(--surface-card);
  border: 1px solid var(--border-strong);
  border-radius: 0.375rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.menu__item {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  text-align: left;
  font-size: 0.95rem;
  color: var(--color-text);
  background: transparent;
  border: 0;
  border-radius: 0.25rem;
  cursor: pointer;
}

.menu__item:hover,
.menu__item:focus {
  background: var(--surface-subtle);
}

These demo styles use shared design tokens (light + dark). Copy the shared styles too, then toggle data-theme on your root element for dark mode.

The data-* attributes you add to your own HTML to wire this component. Put the data-controller below on a root element, then place its targets / values / actions inside that element.

On the root element data-controller="stimeo--menu"

Targets

Name	Description	Attribute
`trigger` required	The menu button that toggles the menu; carries `aria-haspopup`/`aria-expanded` and receives focus back on close.	`data-stimeo--menu-target="trigger"`
`menu` required	The `role="menu"` element shown/hidden via `hidden`.	`data-stimeo--menu-target="menu"`
`item`	A `role="menuitem"` command with roving focus; activating it closes the menu and returns focus to the trigger.	`data-stimeo--menu-target="item"`

Actions

Name	Description	Action
`activate`	Closes the menu after an item is activated and returns focus to the trigger.	`stimeo--menu#activate`
`close`	Closes the menu and reflects the collapsed state on the trigger.	`stimeo--menu#close`
`onItemKeydown`	Roving focus and closing keys inside the menu: Arrow keys (wrapping), Home/End, Escape (close+focus trigger), Tab (close).	`stimeo--menu#onItemKeydown`
`onTriggerKeydown`	Opens the menu from the trigger via keyboard: ArrowDown focuses the first item, ArrowUp the last.	`stimeo--menu#onTriggerKeydown`
`open`	Opens the menu and reflects the expanded state on the trigger.	`stimeo--menu#open`
`toggle`	Toggles the menu; when opening, focuses the first item.	`stimeo--menu#toggle`

State hooks

The library only manages these ARIA/data attributes and custom properties. Your CSS reads them to render the look — selectors like [aria-selected], [aria-expanded], or var(--stimeo--…) hook into this state.

Hook	Target	Meaning
`aria-expanded`	Trigger	"true" while the menu is open, "false" when closed.
`hidden`	Menu	Removed when open, present when closed.