@acusti/dropdown

Dropdown is a React component that renders a menu-like UI with a trigger that the user clicks to disclose a dropdown positioned below the trigger. The body of the dropdown can include any DOM, and many dropdowns can be combined to form a multi-item menu, like the system menu in the top toolbar of macOS.

The three primary design goals for the existence of this component:

1. Best-in-class UX (inspired by macOS native menus) with excellent keyboard support
2. Best-in-class DX with the simplest possible API:
   1. To create a dropdown with a <button> trigger, pass in a single child element with the body of the dropdown
   2. To create a dropdown with a custom trigger, pass in exactly two child elements; the first is the trigger, the second is the body of the dropdown
   3. To create a dropdown with a list of items as the body, use the data-ukt-item boolean to mark dropdown items, or use data-ukt-value="foo" to specify that an element is a dropdown item and the value of that item at the same time (otherwise, the value is the text content of the dropdown item element)
   4. To style your dropdowns, use CSS; there are a collection of CSS custom properties used internally to style them if that works best for you, or just override the minimal default CSS as appropriate
3. Lightweight bundle size with the bare minimum of dependencies (see minzipped size above)

See the storybook docs and demo to get a feel for what it can do.

Usage

npm install @acusti/dropdown
# or
yarn add @acusti/dropdown

Props

This is the type signature for the props you can pass to Dropdown. The unique features provided by the component are called out and explained above the corresponding prop via JSDoc comments:

type Props = {
    /**
     * Boolean indicating if the user can submit a value not already in the
     * dropdown.
     */
    allowCreate?: boolean;
    /**
     * Boolean indicating if the user can submit an empty value (i.e. clear
     * the value). Defaults to true.
     */
    allowEmpty?: boolean;
    /**
     * Can take a single React element or exactly two renderable children.
     */
    className?: string;
    disabled?: boolean;
    hasItems?: boolean;
    isOpenOnMount?: boolean;
    isSearchable?: boolean;
    keepOpenOnSubmit?: boolean;
    label?: string;
    /**
     * Only usable in conjunction with {isSearchable: true}.
     * Used as search input’s name.
     */
    name?: string;
    onClick?: (event: React.MouseEvent<HTMLElement>) => unknown;
    onClose?: () => unknown;
    onMouseDown?: (event: React.MouseEvent<HTMLElement>) => unknown;
    onMouseUp?: (event: React.MouseEvent<HTMLElement>) => unknown;
    onOpen?: () => unknown;
    onSubmitItem?: (payload: Item) => void;
    /**
     * Only usable in conjunction with {isSearchable: true}.
     * Used as search input’s placeholder.
     */
    placeholder?: string;
    style?: React.CSSProperties;
    /**
     * Only usable in conjunction with {isSearchable: true}.
     * Used as search input’s tabIndex.
     */
    tabIndex?: number;
    /**
     * Used as search input’s value if props.isSearchable === true
     * Used to determine if value has changed to avoid triggering onSubmitItem if not
     */
    value?: string;
};