willow-section-list

A simple React Native component that takes an array of data and renders a SectionList with alphabetically (or custom) sorted data.

Motivation

Unlike alternatives, this package takes an array of data rather than an object with letters as keys.

For example,

Other packages

const data = {
  A: [{...}, ...],
  B: [{...}, ...],
  C: [{...}, ...],
  ...
}

This package

const data = [{...}, {...}, {...}, ...]

For willow-section-list, the data does not need to be pre-formatted and sorted before use. The component handles all this logic internally. You can also provide an array of characters to sort your sections in a custom order.

Installation

Using npm:

npm install willow-section-list

or with yarn:

yarn add willow-section-list

Basic Usage

import { AlphabetList } from "willow-section-list";

const data = [
  { value: 'Lillie-Mai Allen', key: 'lCUTs2' },
  { value: 'Emmanuel Goldstein', key: 'TXdL0c' },
  { value: 'Winston Smith', key: 'zqsiEw' },
  { value: 'William Blazkowicz', key: 'psg2PM' },
  { value: 'Gordon Comstock', key: '1K6I18' },
  { value: 'Philip Ravelston', key: 'NVHSkA' },
  { value: 'Rosemary Waterlow', key: 'SaHqyG' },
  { value: 'Julia Comstock', key: 'iaT1Ex' },
  { value: 'Mihai Maldonado', key: 'OvMd5e' },
  { value: 'Murtaza Molina', key: '25zqAO' },
  { value: 'Peter Petigrew', key: '8cWuu3' },
]

render() {
  return (
    <AlphabetList
      data={data}
      indexLetterColor={'blue'}
      renderCustomItem={(item) => (
        <View style={styles.listItemContainer}>
          <Text style={styles.listItemLabel}>{item.value}</Text>
        </View>
      )}
      renderCustomSectionHeader={(section) => (
        <View style={styles.sectionHeaderContainer}>
          <Text style={styles.sectionHeaderLabel}>{section.title}</Text>
        </View>
      )}
    />
  )
}

API

Props

| Prop | Description | Type | Signature (func) | Default | | --- | --- | --- | --- | --- | | data | List of objects to be sorted and rendered in the SectionList. Each item must have both a value property and unique a key property. | array | | | | index (optional) | The characters used to sort each item into sections. These characters are rendered on the right-hand side and clicking on each item scrolls the user to its respective section. The default is the letters of the alphabet. | array | | ['a', 'b', 'c', 'd', 'e', 'f', ...] (see DEFAULT_CHAR_INDEX here)| | renderCustomItem (optional) | Render a row in the SectionList. Should return a valid React Element. | func | { item: { value: string, key: string } } : ReactElement | | | renderCustomSectionHeader (optional) | Render a section header in the SectionList. Should return a valid React Element. | func | { section: { title: string, index: number, data: array } } : ReactElement | | | getItemHeight (optional) | For sectionListGetItemLayout. This may be necessary if each item has a dynamic height. This allows for smooth scrolling and accurate positioning when scrolling to a section. | func | { sectionIndex: number, rowIndex: number } : number | | | sectionHeaderHeight (optional) | The height of the section header. | number | | 40 | | indexLetterColor (optional) | Changes the colour of each character in the letter index. | string | | #007aff |

You can also provide any valid SectionList props. A list of available props can be found here.

Custom index

You can provide a custom array of characters to the component using the index prop. For example, if we wanted to sort alphabetically in-reverse, we could do:

const customIndex = [
  'z',
  'y',
  'x',
  'w',
  ...
]

<AlphabetList
  ...
  index={customIndex}
/>

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update the tests as appropriate.

License

MIT