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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| import cn from 'classnames'; | ||
| import debounce from 'lodash.debounce'; | ||
| import React, { useCallback, useMemo, useState } from 'react'; | ||
| import { Person } from '../../types/Person'; | ||
|
|
||
| type Props = { | ||
| people: Person[]; | ||
| onSelect: (person: Person) => void; | ||
| onChange: () => void; | ||
| delay?: number; | ||
| }; | ||
|
|
||
| export const Autocomplete: React.FC<Props> = React.memo(function Autocomplete({ | ||
| people, | ||
| onSelect, | ||
| onChange, | ||
| delay = 300, | ||
| }) { | ||
| const [query, setQuery] = useState(''); | ||
| const [appliedQuery, setAppliedQuery] = useState(''); | ||
| const [isOpen, setIsOpen] = useState(false); | ||
| const [highlightIndex, setHighlightIndex] = useState<number>(-1); | ||
|
|
||
| const applyQuery = useMemo(() => { | ||
| return debounce((value: string) => { | ||
| setAppliedQuery(value); | ||
| }, delay); | ||
| }, [delay]); | ||
|
|
||
| const handleQueryChange = useCallback( | ||
| (event: React.ChangeEvent<HTMLInputElement>) => { | ||
| setQuery(event.target.value); | ||
| applyQuery(event.target.value); | ||
| onChange(); | ||
| setIsOpen(true); | ||
| setHighlightIndex(-1); | ||
| }, | ||
| [applyQuery, onChange], | ||
| ); | ||
|
|
||
| const suggestions = useMemo(() => { | ||
| if (!appliedQuery.trim()) { | ||
| return people; | ||
| } | ||
|
|
||
| return people.filter(p => | ||
| p.name.toLowerCase().includes(appliedQuery.toLowerCase()), | ||
| ); | ||
| }, [appliedQuery, people]); | ||
|
|
||
| const handleSelect = useCallback( | ||
| (person: Person) => { | ||
| setQuery(person.name); | ||
| setAppliedQuery(person.name); | ||
| setIsOpen(false); | ||
| onSelect(person); | ||
| }, | ||
| [onSelect], | ||
| ); | ||
|
|
||
| const handleKeyDown = (event: React.KeyboardEvent<HTMLInputElement>) => { | ||
| if (!isOpen || suggestions.length === 0) { | ||
| return; | ||
| } | ||
|
|
||
| if (event.key === 'ArrowDown') { | ||
| setHighlightIndex(prev => (prev + 1) % suggestions.length); | ||
| } else if (event.key === 'ArrowUp') { | ||
| setHighlightIndex(prev => | ||
| prev <= 0 ? suggestions.length - 1 : prev - 1, | ||
| ); | ||
| } else if (event.key === 'Enter' && highlightIndex >= 0) { | ||
| handleSelect(suggestions[highlightIndex]); | ||
| } | ||
| }; | ||
|
|
||
| return ( | ||
| <div className={cn('dropdown', { 'is-active': isOpen })}> | ||
| <div className="dropdown-trigger"> | ||
| <input | ||
| type="text" | ||
| placeholder="Enter a part of the name" | ||
| className="input" | ||
| value={query} | ||
| onChange={handleQueryChange} | ||
| onFocus={() => setIsOpen(true)} | ||
| onKeyDown={handleKeyDown} | ||
| aria-expanded={isOpen} | ||
| aria-controls="suggestions-list" | ||
| /> | ||
| </div> | ||
|
|
||
| {isOpen && ( | ||
| <div | ||
| id="suggestions-list" | ||
| className="dropdown-menu" | ||
| role="listbox" | ||
| data-cy="suggestions-list" | ||
| > | ||
| <div className="dropdown-content"> | ||
| {suggestions.map((person, index) => ( | ||
| <div | ||
| key={`${person.slug}-${index}`} | ||
| role="option" | ||
| aria-selected={highlightIndex === index} | ||
| className={cn('dropdown-item', { | ||
| 'is-active': highlightIndex === index, | ||
| })} | ||
| onClick={() => handleSelect(person)} | ||
| data-cy="suggestion-item" | ||
| > | ||
| <p className="has-text-link">{person.name}</p> | ||
| </div> | ||
| ))} | ||
| </div> | ||
| </div> | ||
| )} | ||
|
|
||
| {suggestions.length === 0 && query.trim() !== '' && ( | ||
| <div | ||
| className="notification is-danger is-light mt-3" | ||
| role="alert" | ||
| data-cy="no-suggestions-message" | ||
| > | ||
| <p className="has-text-danger">No matching suggestions</p> | ||
| </div> | ||
| )} | ||
| </div> | ||
| ); | ||
| }); | ||
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This violates the checklist item 'don't generate key on render'. The key
${person.slug}-${index}includesindexwhich changes when items reorder, forcing React to re-render the DOM node instead of moving it. Useperson.slugdirectly as the key since it's a stable identifier from the data.