useFilter

Provides localized string search functionality that is useful for filtering or matching items in a list. Options can be provided to adjust the sensitivity to case, diacritics, and other parameters.

Introduction#

useFilter provides functions for filtering or searching based on substring matches. The builtin JavaScript string methods startsWith, endsWith, and includes could be used for this, but do not implement locale sensitive matching. useFilter provides options to allow ignoring case, diacritics, and Unicode normalization forms, which are implemented according to locale-specific rules. It automatically uses the current locale set by the application, either via the default browser language or via the I18nProvider.

API#

Interface#

Example#

The following example implements a filterable list using a contains matching strategy that ignores both case and diacritics.

import {useFilter} from '@react-aria/i18n';

function Example() {
  const composers = [
    'Wolfgang Amadeus Mozart',
    'Johann Sebastian Bach',
    'Ludwig van Beethoven',
    'Claude Debussy',
    'George Frideric Handel',
    'Frédéric Chopin',
    'Johannes Brahms',
    'Pyotr Ilyich Tchaikovsky',
    'Antonín Dvořák',
    'Felix Mendelssohn',
    'Béla Bartók',
    'Niccolò Paganini'
  ];

  let { contains } = useFilter({
    sensitivity: 'base'
  });

  let [value, setValue] = React.useState('');
  let matchedComposers = composers.filter((composer) =>
    contains(composer, value)
  );

  return (
    <>
      <label htmlFor="search-input">Filter:</label>
      <input
        type="search"
        id="search-input"
        value={value}
        onChange={(e) => setValue(e.target.value)}
      />
      <ul style={{ height: 300 }}>
        {matchedComposers.map((composer, i) => <li key={i}>{composer}</li>)}
      </ul>
    </>
  );
}

import {useFilter} from '@react-aria/i18n';

function Example() {
  const composers = [
    'Wolfgang Amadeus Mozart',
    'Johann Sebastian Bach',
    'Ludwig van Beethoven',
    'Claude Debussy',
    'George Frideric Handel',
    'Frédéric Chopin',
    'Johannes Brahms',
    'Pyotr Ilyich Tchaikovsky',
    'Antonín Dvořák',
    'Felix Mendelssohn',
    'Béla Bartók',
    'Niccolò Paganini'
  ];

  let { contains } = useFilter({
    sensitivity: 'base'
  });

  let [value, setValue] = React.useState('');
  let matchedComposers = composers.filter((composer) =>
    contains(composer, value)
  );

  return (
    <>
      <label htmlFor="search-input">Filter:</label>
      <input
        type="search"
        id="search-input"
        value={value}
        onChange={(e) => setValue(e.target.value)}
      />
      <ul style={{ height: 300 }}>
        {matchedComposers.map((composer, i) => (
          <li key={i}>
            {composer}
          </li>
        ))}
      </ul>
    </>
  );
}

import {useFilter} from '@react-aria/i18n';

function Example() {
  const composers = [
    'Wolfgang Amadeus Mozart',
    'Johann Sebastian Bach',
    'Ludwig van Beethoven',
    'Claude Debussy',
    'George Frideric Handel',
    'Frédéric Chopin',
    'Johannes Brahms',
    'Pyotr Ilyich Tchaikovsky',
    'Antonín Dvořák',
    'Felix Mendelssohn',
    'Béla Bartók',
    'Niccolò Paganini'
  ];

  let { contains } =
    useFilter({
      sensitivity: 'base'
    });

  let [value, setValue] =
    React.useState('');
  let matchedComposers =
    composers.filter(
      (composer) =>
        contains(
          composer,
          value
        )
    );

  return (
    <>
      <label htmlFor="search-input">
        Filter:
      </label>
      <input
        type="search"
        id="search-input"
        value={value}
        onChange={(e) =>
          setValue(
            e.target
              .value
          )}
      />
      <ul
        style={{
          height: 300
        }}
      >
        {matchedComposers
          .map((
            composer,
            i
          ) => (
            <li key={i}>
              {composer}
            </li>
          ))}
      </ul>
    </>
  );
}