43. Autocomplete

Build an Autocomplete component in React that filters a list of options as the user types and allows selection via keyboard or mouse.

1. Input Field

• Text input for user typing
• Filter options based on input value
• Case-insensitive matching

2. Dropdown List

• Show filtered options below input
• Highlight matching text in options
• Show/hide dropdown based on input focus and matches

3. Selection

• Click option to select
• Keyboard navigation (Arrow Up/Down, Enter)
• Update input value on selection
• Close dropdown after selection

4. Data Structure

interface AutocompleteProps {
  options: string[];
  onSelect?: (value: string) => void;
  placeholder?: string;
}

Examples

const options = ['Apple', 'Banana', 'Cherry', 'Date', 'Elderberry'];

<Autocomplete 
  options={options}
  onSelect={(value) => console.log('Selected:', value)}
  placeholder="Search fruits..."
/>