react-functional-select

react-functional-select

Micro-sized & micro-optimized select component for React.js.

Key features:

• Fully-featured package that is truly lightweight: 8 KB (gzipped)!
• Extensible styling API with styled-components
• Opt-in properties to make the component fully accessible
• Effortlessly scroll, filter, and key through datasets numbering in the tens of thousands via react-window + performance-first code. See in memory load tests from 100 to 50,000 options here!
• Async mode for fetching dynamic options from a remote server using the search input value (starting in v2.1.0)

Peer dependencies:

• styled-components for dynamic styling/theming via CSS-in-JS
• react-window for integrated menu option data virtualization/windowing

Overview

Essentially, this is a focused subset of react-select's API that is engineered for ultimate performance and minimal bundle size. It is built entirely using React Hooks and FunctionComponents. The primary design principal revolves around weighing the cost/benefits of adding a feature against the impact to performance & # of lines of code its addition would have.

I opted to exclude less "in-demand" features such as:

• Preventing scroll events on the app's body if the menu is open TODO: add code example
• Closing an open menu if the app's body is scrolled TODO: add code example

These feature would have added significant overhead to the package. In addition, if we expose the right public methods and/or callback properties, this feature should be trivial to add to wrapping components - proper decoupling and abstraction of code is key to keeping such channels open for similar customizations that can be kept out of this package.

Installation

$ npm i react-window styled-components react-functional-select
$ yarn add react-window styled-components react-functional-select

Note that you need to be on a react version that supports hooks, e.g.
react@^16.8 react-dom@^16.8 react-is@^16.8

Usage

• Demo
• Stories source code

You can find a similar example, along with others, in the storybook..

import { Select } from 'react-functional-select';
import React, { useState, useEffect, useCallback } from 'react';
import { Card, CardHeader, CardBody, Container, SelectContainer } from './helpers/styled';

type CityOption = {
  readonly id: number;
  readonly city: string;
  readonly state: string;
};

const _cityOptions: CityOption[] = [
  { id: 1, city: 'Austin', state: 'TX' },
  { id: 2, city: 'Denver', state: 'CO' },
  { id: 3, city: 'Chicago', state: 'IL' },
  { id: 4, city: 'Phoenix', state: 'AZ' },
  { id: 5, city: 'Houston', state: 'TX' }
];

const SingleSelectDemo: React.FC = () => {
  const [isInvalid, setIsInvalid] = useState<boolean>(false);
  const [isDisabled, setIsDisabled] = useState<boolean>(false);
  const [isClearable, setIsClearable] = useState<boolean>(true);
  const [selectedOption, setSelectedOption] = useState<CityOption | null>(null);

  const getOptionValue = useCallback((option: CityOption): number => option.id, []);
  const onOptionChange = useCallback((option: CityOption | null): void => setSelectedOption(option), []);
  const getOptionLabel = useCallback((option: CityOption): string => `${option.city}, ${option.state}`, []);

  useEffect(() => {
    isDisabled && setIsInvalid(false);
  }, [isDisabled]);

  return (
    <Container>
      <Card>
        <CardHeader>
          {`Selected Option: ${JSON.stringify(selectedOption || {})}`}
        </CardHeader>
        <CardBody>
          <SelectContainer>
            <Select
              isInvalid={isInvalid}
              options={_cityOptions}
              isDisabled={isDisabled}
              isClearable={isClearable}
              onOptionChange={onOptionChange}
              getOptionValue={getOptionValue}
              getOptionLabel={getOptionLabel}
            />
          </SelectContainer>
        </CardBody>
      </Card>
    </Container>
  );
};

Properties

All properties are technically optional (with a few having default values). Very similar with react-select's API.

Note that the following non-primitive properties should be properly memoized if defined:
clearIcon, caretIcon, options, renderOptionLabel, renderMultiOptions, onMenuOpen, onOptionChange, onKeyDown, getOptionLabel, getOptionLabel, getOptionValue, onInputBlur, onInputFocus, onInputChange, onSearchChange, getIsOptionDisabled, getFilterOptionString, themeConfig

Property	Type	Default	Description
inputId	string	undefined	The id of the autosize search input
selectId	string	undefined	The id of the parent div
ariaLabel	string	undefined	Aria label (for assistive tech)
isMulti	bool	false	Does the control allow for multiple selections (defaults to single-value mode)
async	bool	false	Is the component in 'async' mode - when in 'async' mode, updates to the input search value will NOT cause the effect useMenuOptions to execute (this effect parses options into stateful value menuOptions)
autoFocus	bool	false	Focus the control following initial mount of component
isLoading	bool	false	Is the select in a state of loading - shows loading dots animation
isInvalid	bool	false	Is the current value invalid - control recieves invalid styling
inputDelay	number	undefined	The debounce delay in for the input search (milliseconds)
isDisabled	bool	false	Is the select control disabled - recieves disabled styling
required	bool	false	Is the select control required - applied to the input element. When true, the optionally specified CSS from the themeConfig.input.cssRequired field will be applied to the input element.
placeholder	string	Select option..	Placeholder text for the select value
menuWidth	ReactText	100%	Width of the menu
menuItemSize	number	35	The height of each option in the menu (px)
isClearable	bool	false	Is the select value clearable
noOptionsMsg	string	No options	The text displayed in the menu when there are no options available
loadingMsg	string	Loading...	The text displayed in the menu when isLoading === true
clearIcon	ReactNode OR ((state: Partial<IndicatorIconsProps>) => ReactNode)	undefined	Custom clear icon node - state forwarded to a function is { menuOpen, isLoading, isInvalid, isDisabled }
caretIcon	ReactNode OR ((state: Partial<IndicatorIconsProps>) => ReactNode)	undefined	Custom caret icon node - state forwarded to a function is { menuOpen, isLoading, isInvalid, isDisabled }
loadingNode	ReactNode	undefined	Custom loading node
options	array	[]	The menu options
isSearchable	bool	true	Whether to enable search functionality or not
hideSelectedOptions	bool	false	Hide the selected option from the menu (if undefined and isMulti = true, then defaults to true)
openMenuOnClick	bool	true	If true, the menu can be toggled by clicking anywhere on the select control; if false, the menu can only be toggled by clicking the 'caret' icon on the far right of the control
menuMaxHeight	number	300	Max height of the menu element - this effects how many options react-window will render
menuOverscanCount	number	1	correlates to react-window property overscanCount: The number of items (options) to render outside of the visible area. Increasing the number can impact performance, but is useful if the option label is complex and the renderOptionLabel prop is defined
itemKeySelector	ReactText	undefined	If defined, will use the property in your original options as each option's key, rather than the parsed stateful value menuOptions index (this needs to be a unique property - so properties such as id or value). This relates to the itemKey property in dependency react-window - more info here
menuScrollDuration	number	300	Duration of scroll menu into view animation
addClassNames	bool	false	Should static classNames be generated for container elements (enable if styling using CSS stylesheets)
ariaLabelledBy	string	undefined	HTML ID of an element that should be used as the label (for assistive tech)
openMenuOnFocus	bool	false	Open the menu when the select control recieves focus
initialValue	any	undefined	Initial select value
tabSelectsOption	bool	true	Select the currently focused option when the user presses tab
blurInputOnSelect	bool	false	Remove focus from the input when the user selects an option (useful for dismissing the keyboard on touch devices)
closeMenuOnSelect	bool	true	Close the select menu when the user selects an option
isAriaLiveEnabled	bool	false	Enables visually hidden div that reports stateful information (for assistive tech)
scrollMenuIntoView	bool	true	Performs animated scroll to show menu in view when menu is opened (if there is room to do so)
backspaceClearsValue	bool	true	Remove the currently focused option when the user presses backspace
filterMatchFrom	'any' OR 'start'	'any'	Position in stringified option to match search input
menuPosition	'top' OR 'auto' OR 'bottom'	'bottom'	Determines where menu will be placed in relation to the control - 'auto' will first check if menu has space to open below the control, otherwise it will open above the control.
filterIgnoreCase	bool	true	Search input ignores case of characters when comparing
filterIgnoreAccents	bool	false	Search input will strip diacritics from string before comparing
onMenuOpen	(...args: any[]): void	undefined	Callback function executed after the menu is opened
onMenuClose	(...args: any[]): void	undefined	Callback function executed after the menu is closed
onOptionChange	(data: any): void	undefined	Callback function executed after a new option is selected
onKeyDown	(e: KeyboardEvent<HTMLDivElement>, input?: string, focusedOption?: FocusedOption): void	undefined	Callback function executed onKeyDown event
getOptionLabel	(data: any): ReactText	undefined	Resolves option data to React.ReactText to be displayed as the label by components (by default will use option.label)
getOptionValue	(data: any): ReactText	undefined	Resolves option data to React.ReactText to compare option values (by default will use option.value)
onInputBlur	(e: FocusEvent<HTMLInputElement>): void	undefined	Handle blur events on the search input
onInputFocus	(e: FocusEvent<HTMLInputElement>): void	undefined	Handle focus events on the search input
onInputChange	(value: string): void	undefined	Handle change events on the search input
onSearchChange	(value: string): void	undefined	Callback executed after the debounced search input value is persisted to the component's state - if no debounce is defined via the inputDelay property, it probably makes more sense to use onInputChange instead.
renderOptionLabel	(data: any): ReactNode	undefined	Formats option labels in the menu and control as JSX.Elements or React Components (by default will use getOptionLabel)
renderMultiOptions	(params: MultiParams): ReactNode	undefined	Allows for customization as to how multi-select options should be formatted. The MultiParams contains the array of selected options { selected: Array<{ data: any, value: ReactText, label: ReactText}>, renderOptionLabel: (data: any): ReactNode }. Left and right arrow key navigation will also be disabled when this property is defined.
getIsOptionDisabled	(data: any): boolean	undefined	When defined will evaluate each option to determine whether it is disabled or not (if not specified, each option will be evaluated as to whether or not it contains a property of isDisabled with a value of true)
getFilterOptionString	(option: any): string	undefined	When defined will take each option and generate a string used in the filtering process (by default, will use option.label)
themeConfig	Partial<DefaultTheme>	undefined	Object that takes specified property key-value pairs and merges them into the theme object

Inspiration

This project was inspired by react-select.

License

MIT licensed. Matt Areddia © 2019.