smov/src2/components/SelectBox.js

import { useRef, useState, useEffect } from "react";
import "./SelectBox.css";

function Option({ option, ...props }) {
  return (
    <div className="option" {...props}>
      <input type="radio" className="radio" id={option.id} />
      <label htmlFor={option.id}>
        <div className="item">{option.name}</div>
      </label>
    </div>
  );
}

export function SelectBox({ options, selectedItem, setSelectedItem }) {
  if (!Array.isArray(options)) {
    throw new Error("Items must be an array!");
  }

  const [active, setActive] = useState(false);

  const containerRef = useRef();

  const handleClick = (e) => {
    if (containerRef.current.contains(e.target)) {
      // inside click
      return;
    }
    // outside click
    closeDropdown();
  };

  const closeDropdown = () => {
    setActive(false);
  };

  useEffect(() => {
    // add when mounted
    document.addEventListener("mousedown", handleClick);
    // return function to be called when unmounted
    return () => {
      document.removeEventListener("mousedown", handleClick);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  const onOptionClick = (e, option, i) => {
    e.stopPropagation();
    setSelectedItem(i);
    closeDropdown();
  };

  const handleSelectedKeyPress = (event) => {
    if (event.code === "Enter" || event.code === "Space") {
      setActive((a) => !a);
    }
  };

  const handleOptionKeyPress = (option, i) => (event) => {
    if (event.code === "Enter" || event.code === "Space") {
      onOptionClick(event, option, i);
    }
  };

  return (
    <div
      className="select-box"
      ref={containerRef}
      onClick={() => setActive((a) => !a)}
    >
      <div
        className="selected"
        tabIndex={0}
        onKeyPress={handleSelectedKeyPress}
      >
        {options ? <Option option={options[selectedItem]} /> : null}
      </div>
      <div className={"options-container" + (active ? " active" : "")}>
        {options.map((opt, i) => (
          <Option
            option={opt}
            key={i}
            onClick={(e) => onOptionClick(e, opt, i)}
            tabIndex={active ? 0 : undefined}
            onKeyPress={active ? handleOptionKeyPress(opt, i) : undefined}
          />
        ))}
      </div>
    </div>
  );
}