framework/js/old/common/components/SelectDropdown.js

import Dropdown from './Dropdown';
import icon from '../helpers/icon';

/**
 * The `SelectDropdown` component is the same as a `Dropdown`, except the toggle
 * button's label is set as the label of the first child which has a truthy
 * `active` prop.
 *
 * ### Props
 *
 * - `caretIcon`
 * - `defaultLabel`
 */
export default class SelectDropdown extends Dropdown {
  static initProps(props) {
    props.caretIcon = typeof props.caretIcon !== 'undefined' ? props.caretIcon : 'fas fa-sort';

    super.initProps(props);

    props.className += ' Dropdown--select';
  }

  getButtonContent() {
    const activeChild = this.props.children.filter((child) => child.props.active)[0];
    let label = (activeChild && activeChild.props.children) || this.props.defaultLabel;

    if (label instanceof Array) label = label[0];

    return [<span className="Button-label">{label}</span>, icon(this.props.caretIcon, { className: 'Button-caret' })];
  }
}