react-dropdown-aria

react-dropdown-aria

Simple, lightweight, and accessible React dropdown component.

Purpose

This component was created to be a light weight and fully accessible dropdown component for React. For a more feature heavy and powerful dropdown look to the react-select package. (This dropdown is inspired by react-select)

Features

1. Fully customizable styling
2. Grouped options
3. Accessible
4. Type to find item
5. Custom render function props
6. Typescript typings included

Demo And Examples

For demo and examples see https://jfangrad.github.io/react-dropdown-aria/

Installation

Simply use npm or yarn to install the package.

// Yarn
$ yarn add react-dropdown-aria

// npm
$ npm install --save react-dropdown-aria

You can then include it in your project as needed:

import Dropdown from 'react-dropdown-aria';

Usage

Options should be provided to the Dropdown as an array of objects.

Simple Example:

<Dropdown
  ...
  options: {[
    { value: 'one' },
    { value: 'two' },
    { value: 'three' }
  ]}
/>

Each option object in the array of options can have the following keys:

key	Type	Default	Description
ariaLabel	string	null	Aria Label to be applied to the option
className	string	null	CSS class to be applied to this option
title	string	null	HTML title to be used for the option
value	string	null	The value to be displayed in the dropdown (Required)

Groups Example

Groups of items can also be implemented by pasing an array of objects of the following form to the dropdown options prop:

<Dropdown
  ...
  options: {[
    { label: 'Group 1', groupOptions: optionsGroup1 },
    { label: 'Group 2', groupOptions: optionsGroup2 },
  ]}
/>

Where the groupOptions is an array of options as described above, and the label is the string to display above the group in the dropdown.

Styling

Custom styling can be applied to the dropdown through 2 ways:

1. CSS className props (As seen in props table below)
2. Emotion JavaScript Objects passed to style prop

The suggested method is by using the style prop as shown in the Custom Styling Example. The following object keys are supported to apply style to the corresponding part of the dropdown:

Arrow, DropdownButton, DisplayedValue, DropdownWrapper, GroupContainer, GroupHeading, GroupDivider, OptionContainer, OptionItem

The style prop should be passed an object containing one or more of the above properties. Each of those properties should be a function that returns an object. An example is shown below:

const style = {
  OptionItem: (base, state, { selected }) => ({
    ...base,
    fontSize: '0.95em',
    color: selected ? 'white' : 'black',
    backgroundColor: selected ? '#00A3EF' : 'white',
    '&:hover': {
      backgroundColor: selected ? '#0092d6' : '#e0f5ff',
    },
    '&:focus': {
      backgroundColor: selected ? '#0092d6' : '#e0f5ff',
    },
  }),
  ...
}

As shown above, each function will be called with base and state at minimum and some will be provided a third extraState parameter which should be an object, as shown with optionStyle where the extraState contains whether an option is currently selected or not.

base - is the default styles object. It can either be spread out to extend the default styles (as shown above) or ommitted to ignore all default styles

state - is the internal state of the dropdown

Dropdown Props

Property	Type	Default	Description
ariaDescribedBy	string	null	ID of element that should be used to describe the dropdown
ariaLabel	string	null	Aria Label to be applied to the main dropdown button
ariaLabelledBy	string	null	ID of element that should be used as the label for the dropdown
arrowRenderer	function	undefined	Custom function to render the arrow for the dropdown
centerText	boolean	false	Whether main dropdown button text should be centered or not
className	string	undefined	CSS class to be applied to the drodown
contentClassName	string	undefined	CSS class to be applied to the dropdown option ul container
defaultOpen	boolean	false	Whether the dropdown should be open by default
disabled	boolean	false	Whether the dropdown should be disabled or not
height	number	null	Use to set the dropdown height manually
hideArrow	boolean	false	Controls whether dropdown component has the arrow or not
id	string	undefined	id to be passed to the main dropdown button
maxContentHeight	number	null	Controls the max height of the dropdown area that contains all options
openUp	boolean	false	Whether dropdown should open up or not
optionRenderer	function	undefined	Custom function to render the options displayed in the dropdown
options	array	[]	Array of option objects
optionClassName	string	undefined	CSS class to be applied to all options in the dropdown
pageKeyTraverseSize	number	10	Number of options page up or page down will move the current focused by
placeholder	string	Select...	Placeholder value for dropdown
value	string	null	The value of the option that is currently selected (as set by setSelected).
selectedValueClassName	string	undefined	CSS class to be applied to main drodown button text
searchable	boolean	true	Whether or not the keyboard can be used to quickly navigate to an item through typing
onChange	function	undefined	Function called when the selected value changes
style	object	{}	Use to change the style of the dropdown through js instead of css (see styling section)
width	number	null	Use to set the dropdown width manually

Developing

Clone the repo

git clone https://github.com/jfangrad/react-dropdown-aria.git

Install node modules

yarn install

Then in two seperate consoles start the library and demo

yarn lib:dev
yarn demo:dev