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Component

Language Select

Single-select listbox for languages with an optional native name.

  • Component
  • React
  • TSX
  • Tailwind CSS
  • MIT

What it does

Capabilities

  • Semantic HTML
  • ARIA
  • Associated labels

Preview

Live component

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devsnips.site/library/react/components/selects/language-select/
fluid · no fixed width 100%
No dependencies Responsive · Light/dark · Focus-visible

Install

Add to your project

terminal
npx devsnips add React/Components/Selects/language-select
registry path: React/Components/Selects/language-select

Source

Implementation

code.tsx 
import type { KeyboardEvent, ReactNode, RefObject } from "react";
import { useEffect, useId, useRef, useState } from "react";

export type SelectSize = "sm" | "md" | "lg";

export interface LanguageOption {
  value: string;
  label: string;
  nativeName?: string;
  disabled?: boolean;
}

export interface LanguageSelectProps {
  label?: string;
  options: LanguageOption[];
  value?: string;
  defaultValue?: string;
  onChange?: (value: string, option: LanguageOption) => void;
  size?: SelectSize;
  placeholder?: string;
  id?: string;
  name?: string;
  className?: string;
}

function cx(...parts: Array<string | false | null | undefined>): string {
  return parts.filter(Boolean).join(" ");
}

const SIZES: Record<SelectSize, string> = {
  sm: "h-8 text-[13px] [&_svg]:size-[14px]",
  md: "h-9 text-sm [&_svg]:size-4",
  lg: "h-11 text-sm [&_svg]:size-[18px]",
};

function ChevronDown({ className }: { className?: string }) {
  return (
    <svg className={className} viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth={1.75} strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
      <path d="m6 9 6 6 6-6" />
    </svg>
  );
}

function GlobeIcon({ className }: { className?: string }) {
  return (
    <svg className={className} viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth={1.75} strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
      <circle cx="12" cy="12" r="9" />
      <path d="M3 12h18M12 3a15 15 0 0 1 0 18M12 3a15 15 0 0 0 0 18" />
    </svg>
  );
}

/**
 * Language single-select. Options may carry a `nativeName` (e.g. "中文" for a
 * spoken language, or a short locale code) which is shown next to the label as
 * muted text. The trigger shows the selected label (plus its native name when
 * present). Full WAI-ARIA combobox/listbox pattern: ArrowUp/Down/Home/End move
 * the active option, Enter/Space selects, Escape closes; outside-click closes.
 * Controlled (value/onChange) and uncontrolled (defaultValue) both supported.
 */
export function LanguageSelect({
  label = "Language",
  options,
  value,
  defaultValue = "",
  onChange,
  size = "md",
  placeholder = "Select a language",
  id,
  name,
  className,
}: LanguageSelectProps) {
  const generatedId = useId();
  const triggerId = id ?? `language-select-${generatedId}`;
  const listboxId = `${triggerId}-listbox`;

  const [internalValue, setInternalValue] = useState(defaultValue);
  const selectedValue = value ?? internalValue;
  const selected = options.find((o) => o.value === selectedValue) ?? null;

  const [open, setOpen] = useState(false);
  const [activeIndex, setActiveIndex] = useState(() => {
    const enabled = options.findIndex((o) => !o.disabled);
    return enabled === -1 ? 0 : enabled;
  });
  const triggerRef = useRef<HTMLButtonElement>(null);
  const listboxRef = useRef<HTMLDivElement>(null);

  function openListbox(nextActive?: number) {
    setOpen(true);
    const cur = selected ? options.indexOf(selected) : -1;
    const fallback = options.findIndex((o) => !o.disabled);
    const start = nextActive ?? (cur >= 0 ? cur : fallback);
    setActiveIndex(Math.max(0, Math.min(options.length - 1, start < 0 ? 0 : start)));
  }

  function choose(option: LanguageOption) {
    if (option.disabled) return;
    if (value === undefined) setInternalValue(option.value);
    onChange?.(option.value, option);
    setOpen(false);
    triggerRef.current?.focus();
  }

  function moveActive(step: number) {
    setActiveIndex((cur) => {
      let next = cur;
      for (let i = 0; i < options.length; i++) {
        next = (next + step + options.length) % options.length;
        if (!options[next].disabled) return next;
      }
      return cur;
    });
  }

  function onKeyDown(event: KeyboardEvent<HTMLButtonElement>) {
    switch (event.key) {
      case "ArrowDown":
        event.preventDefault();
        if (!open) openListbox();
        else moveActive(1);
        break;
      case "ArrowUp":
        event.preventDefault();
        if (!open) openListbox(options.length - 1);
        else moveActive(-1);
        break;
      case "Home":
        if (open) { event.preventDefault(); for (let i = 0; i < options.length; i++) if (!options[i].disabled) { setActiveIndex(i); break; } }
        break;
      case "End":
        if (open) { event.preventDefault(); for (let i = options.length - 1; i >= 0; i--) if (!options[i].disabled) { setActiveIndex(i); break; } }
        break;
      case "Enter":
      case " ":
      case "Spacebar":
        event.preventDefault();
        if (open) choose(options[activeIndex]);
        else openListbox();
        break;
      case "Escape":
        if (open) { event.preventDefault(); setOpen(false); }
        break;
      case "Tab":
        if (open) setOpen(false);
        break;
    }
  }

  const selectedIndex = selected ? options.indexOf(selected) : -1;

  return (
    <div className="w-full">
      <label htmlFor={triggerId} className="mb-2 block text-[13px] font-medium leading-5 text-[var(--ds-color-foreground)]">
        {label}
      </label>
      <div className="relative">
        {name ? <input type="hidden" name={name} value={selectedValue} readOnly /> : null}
        <button
          ref={triggerRef}
          id={triggerId}
          type="button"
          aria-haspopup="listbox"
          aria-expanded={open}
          aria-controls={open ? listboxId : undefined}
          aria-activedescendant={open ? `${triggerId}-opt-${activeIndex}` : undefined}
          onClick={() => (open ? setOpen(false) : openListbox())}
          onKeyDown={onKeyDown}
          className={cx(
            "inline-flex w-full items-center gap-2 rounded-[var(--ds-radius-sm)] border bg-[var(--ds-color-input)] pl-3 pr-2.5 text-left text-[var(--ds-color-foreground)] transition-colors duration-150 ease-out hover:bg-[var(--ds-color-input-hover,var(--ds-color-input))] focus:bg-[var(--ds-color-input-focus,var(--ds-color-input))] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)] disabled:pointer-events-none disabled:bg-[var(--ds-color-muted)] disabled:text-[var(--ds-color-muted-foreground)] disabled:opacity-60 motion-reduce:transition-none",
            "border-[var(--ds-color-border)] focus:border-[var(--ds-color-border-strong)]",
            SIZES[size],
            className,
          )}
        >
          <GlobeIcon className="shrink-0 text-[var(--ds-color-muted-foreground)]" />
          <span className={cx("flex-1 truncate", !selected && "text-[var(--ds-color-muted-foreground)]")}>
            {selected ? (
              <span className="inline-flex items-center gap-2">
                <span className="truncate">{selected.label}</span>
                {selected.nativeName ? (
                  <span className="truncate text-[var(--ds-color-muted-foreground)]">{selected.nativeName}</span>
                ) : null}
              </span>
            ) : placeholder}
          </span>
          <ChevronDown className={cx("shrink-0 text-[var(--ds-color-muted-foreground)] transition-transform duration-150 motion-reduce:transition-none", open && "rotate-180")} />
        </button>
        {open ? (
          <LanguagePanel
            ref={listboxRef}
            id={listboxId}
            labelledby={triggerId}
            options={options}
            activeIndex={activeIndex}
            selectedIndex={selectedIndex}
            triggerId={triggerId}
            onChoose={choose}
            onHover={setActiveIndex}
            onOutside={() => setOpen(false)}
          />
        ) : null}
      </div>
    </div>
  );
}

export default LanguageSelect;

function LanguagePanel({
  ref,
  id,
  labelledby,
  options,
  activeIndex,
  selectedIndex,
  triggerId,
  onChoose,
  onHover,
  onOutside,
}: {
  ref: RefObject<HTMLDivElement>;
  id: string;
  labelledby: string;
  options: LanguageOption[];
  activeIndex: number;
  selectedIndex: number;
  triggerId: string;
  onChoose: (o: LanguageOption) => void;
  onHover: (i: number) => void;
  onOutside: () => void;
}) {
  useEffect(() => {
    function onDown(e: MouseEvent) {
      if (ref.current && !ref.current.contains(e.target as Node)) onOutside();
    }
    document.addEventListener("mousedown", onDown);
    return () => document.removeEventListener("mousedown", onDown);
  }, [onOutside, ref]);

  useEffect(() => {
    const el = ref.current?.querySelector(`[data-i="${activeIndex}"]`);
    el?.scrollIntoView({ block: "nearest" });
  }, [activeIndex, ref]);

  return (
    <div
      ref={ref}
      id={id}
      role="listbox"
      aria-labelledby={labelledby}
      className="absolute z-20 mt-1.5 max-h-60 w-full overflow-auto rounded-[var(--ds-radius-md)] border border-[var(--ds-color-border)] bg-[var(--ds-color-surface-elevated)] p-1 shadow-[var(--ds-shadow-md)]"
    >
      {options.map((option, i) => (
        <button
          key={option.value}
          id={`${triggerId}-opt-${i}`}
          type="button"
          data-i={i}
          role="option"
          aria-selected={i === selectedIndex}
          aria-disabled={option.disabled || undefined}
          disabled={option.disabled}
          onMouseEnter={() => onHover(i)}
          onClick={() => onChoose(option)}
          className={cx(
            "flex w-full items-center justify-between gap-2 rounded-[var(--ds-radius-sm)] px-2.5 py-1.5 text-left text-[13px] text-[var(--ds-color-foreground)] transition-colors motion-reduce:transition-none focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)]",
            i === activeIndex ? "bg-[var(--ds-color-surface-hover)]" : "",
            i === selectedIndex ? "font-medium" : "",
            option.disabled ? "cursor-not-allowed text-[var(--ds-color-muted-foreground)] opacity-60" : "",
          )}
        >
          <span className="flex min-w-0 items-baseline gap-2">
            <span className="truncate">{option.label}</span>
            {option.nativeName ? (
              <span className="truncate text-[var(--ds-color-muted-foreground)]">{option.nativeName}</span>
            ) : null}
          </span>
          {i === selectedIndex ? (
            <svg className="shrink-0 text-[var(--ds-color-primary)]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth={2} strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
              <path d="M20 6 9 17l-5-5" />
            </svg>
          ) : null}
        </button>
      ))}
    </div>
  );
}
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devsnips://components/selects/language-select
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Page:
https://devsnips.site/library/react/components/selects/language-select/

Install: npx devsnips add
React/Components/Selects/language-select

This is the Language Select — Single-select listbox for languages with an optional native name.

Use this DevSnips resource as the starting point for my project.
Adapt it to my project's stack and conventions, fix any issues,
and make it production-ready while preserving its intended design
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Resource URI
devsnips://components/selects/language-select