@reactzero/combo

Headless, accessible React combo & select. Zero dependencies. ARIA 1.2 compliant, < 7 kB gzipped.

Features

• Zero dependencies — Only peer depends on React 18+. No runtime surprises.
• Headless architecture — Full control over markup and styling via the useCombo hook
• Pre-built component — Drop-in <Combo> with render props for quick setup
• ARIA 1.2 compliant — Keyboard navigation, screen reader support, live region announcements
• Tiny bundle — Hook: 4.8 kB, Full: 6.7 kB, CSS: 2.5 kB (all brotli)
• CSS custom properties — 40+ design tokens, built-in dark and high-contrast themes
• TypeScript first — Full generic type inference on all APIs
• Multiple variants — Combobox, select dropdown, grouped items, custom triggers

AI Reference

Feed the AI reference file to your AI coding assistant for complete API docs, examples, and patterns:

• View on GitHub: ai-reference.md
• Direct fetch URL (for AI tools): https://raw.githubusercontent.com/motiondesignlv/ReactZero-Combo/main/ai-reference.md

Installation

npm install @reactzero/combo

Quick Start — Headless Hook

import { useCombo } from "@reactzero/combo/hook";

function MyCombo() {
  const items = ["Apple", "Banana", "Cherry", "Date"];

  const {
    isOpen,
    filteredItems,
    highlightedIndex,
    selectedItem,
    getLabelProps,
    getInputProps,
    getToggleButtonProps,
    getClearButtonProps,
    getMenuProps,
    getItemProps,
    getChevronProps,
    hasSelection,
    icons,
    chevronIcon,
  } = useCombo({ items });

  return (
    <div>
      <label {...getLabelProps()}>Fruit</label>
      <div>
        <input {...getInputProps({ placeholder: "Search..." })} />
        {hasSelection && (
          <button {...getClearButtonProps()}>{icons.clear}</button>
        )}
        <button {...getToggleButtonProps()}>
          <span {...getChevronProps()}>{chevronIcon}</span>
        </button>
      </div>
      <ul {...getMenuProps()} style={{ display: isOpen ? "block" : "none" }}>
        {isOpen &&
          filteredItems.map((item, index) => (
            <li
              key={index}
              {...getItemProps({ item, index })}
              style={{
                background:
                  highlightedIndex === index ? "#dbeafe" : "transparent",
                fontWeight: selectedItem === item ? 600 : 400,
              }}
            >
              {String(item)}
            </li>
          ))}
      </ul>
    </div>
  );
}

Quick Start — Pre-built Component

import { Combo } from "@reactzero/combo";
import "@reactzero/combo/styles";

function App() {
  return (
    <Combo
      items={["Apple", "Banana", "Cherry", "Date"]}
      label="Favorite Fruit"
      placeholder="Search fruits..."
      onSelectedItemChange={(item) => console.log("Selected:", item)}
      renderItem={({ item, isHighlighted, isSelected }) => (
        <div style={{ fontWeight: isSelected ? 600 : 400 }}>{String(item)}</div>
      )}
    />
  );
}

Import Paths

Path	Size	Description
@reactzero/combo/hook	4.8 kB	Hook + types only
@reactzero/combo	6.7 kB	Hook + Combo + Portal + LiveRegion
@reactzero/combo/styles	2.5 kB	Base structural CSS
@reactzero/combo/themes/dark.css	—	Dark theme tokens
@reactzero/combo/themes/high-contrast.css	—	High-contrast theme tokens

Variants

Select Dropdown

<Combo
  items={["United States", "Canada", "Mexico"]}
  variant="select"
  placeholder="Choose a country..."
/>

Grouped Items

<Combo
  groups={[
    { label: "Fruits", items: ["Apple", "Banana"] },
    { label: "Vegetables", items: ["Carrot", "Broccoli"] },
  ]}
  items={[]}
  placeholder="Search..."
/>

Custom Trigger

<Combo
  items={items}
  renderTrigger={({
    getInputProps,
    getToggleButtonProps,
    isOpen,
    chevronIcon,
  }) => (
    <div className="my-trigger">
      <input {...getInputProps()} />
      <button {...getToggleButtonProps()}>{chevronIcon}</button>
    </div>
  )}
/>

Theming

Override CSS custom properties to customize the appearance:

.my-combobox {
  --rzero-combo-input-border: 2px solid #6366f1;
  --rzero-combo-input-focus-ring: 0 0 0 3px rgba(99, 102, 241, 0.3);
  --rzero-combo-item-highlighted-bg: #e0e7ff;
  --rzero-combo-item-selected-color: #4f46e5;
}

Or use built-in themes:

<Combo items={items} theme="dark" />

Documentation

• Live Demo & Examples
• AI Reference — feed to your AI coding assistant for complete API docs

License

MIT