This component provides a dropdown menu of action items. When closed, it displays a text-only button, icon-only button, or a selector box. Selecting a menuitem completes the associated action and closes the menu. It should have at least one menuitem component as a child.
After an action is executed make sure to properly handle focus for accessibility reasons.
In a compound component like Select or Action Menu, child components are rendered in the parent's
slot element, part of its shadow DOM tree. Slots essentially serve as a placeholder for markup that you the developer define in the light DOM tree, like
<wm-option>, text content, or other child elements.
The browser distributes the child elements defined in the light DOM into the shadow DOM of the parent. The result is a flattened DOM tree—a merger of the the light DOM and the shadow DOM. This flattened tree is what you see in DevTools and what is rendered on the page.
With the standard implementation of the component, dynamically updating the child items will throw an error. Elm's efficient diffing of the DOM will register that only the child items have changed and try to update them, but the component has already been composed.
Rendering the component in a Keyed node and giving it a dynamic id will cause the entire component, rather than just the child items, to render anew, avoiding the error.