README.md

RangeSlider

A highly optimized and fully customizable pure JS component for value range selection.

The component is not re-rendered while user moves the thumb.
Even if there is a label, only the label component is re-rendered when values are changed.

RangeSlider uses React Native's Animated library to transform thumbs / label / selected rail.
These optimizations help to achieve as much native look & feel as possible using only the JS layer.

Version 1

The version 1 was using native Android and iOS views.
That gives native look & feel in favor of flexibility.
You can find the version 1 here.

Installation

• npm: npm install --save rn-range-slider
• yarn: yarn add rn-range-slider

Usage

RangeSlider uses react hooks, so this component doesn't work with React Native versions below 0.59.0

You can find basic implementation of needed components (Thumb, Rail, RailSelected, Label, Notch) here.

...

import RangeSlider from 'rn-range-slider';

...

const renderThumb = useCallback(() => <Thumb/>, []);
const renderRail = useCallback(() => <Rail/>, []);
const renderRailSelected = useCallback(() => <RailSelected/>, []);
const renderLabel = useCallback(value => <Label text={value}/>, []);
const renderNotch = useCallback(() => <Notch/>, []);
const handleValueChange = useCallback((low, high) => {
  setLow(low);
  setHigh(high);
}, []);

...

<Slider
  style={styles.slider}
  min={0}
  max={100}
  step={1}
  floatingLabel
  renderThumb={renderThumb}
  renderRail={renderRail}
  renderRailSelected={renderRailSelected}
  renderLabel={renderLabel}
  renderNotch={renderNotch}
  onValueChanged={handleValueChange}
/>

...

Properties

Name	Description	Type	Default Value
min	Minimum value of slider	number	required
max	Maximum value of slider	number	required
minRange	Minimum range of thumbs allowed to be selected by the user. Note: it is still possible to set values closer to each other than minRange programmatically. If disableRange is set to true, maximum value allowed for user will be max - minRange.	number	0
step	Step of slider	number	1
low	Low value of slider	number	Initially min value will be set if not provided
high	High value of slider	number	Initially max value will be set if not provided
floatingLabel	If set to true, labels will not take space in component tree. Instead they will be rendered over the content above the slider (like a small popup).	boolean	false
disableRange	Slider works as an ordinary slider with 1 control if true	boolean	false
disabled	Any user interactions will be ignored if true	boolean	false
allowLabelOverflow	If set to true, labels are allowed to be drawn outside of slider component's bounds. Otherwise label's edges will never get out of component's edges.	boolean	false
renderThumb	Should render the thumb.	() => Node	required
renderRail	Should render the "rail" for thumbs. Rendered component should have flex: 1 style so it won't fill up the whole space.	() => Node	required
renderRailSelected	Should render the selected part of "rail" for thumbs. Rendered component should not have flex: 1 style so it fills up the whole space.	() => Node	required
renderLabel	Should render label above thumbs. If no function is passed, no label will be drawn.	(value: number) => Node	undefined
renderNotch	Should render the notch below the label (above the thumbs). Classic notch is a small triangle below the label. If allowLabelOverflow is not set to true, the notch will continue moving with thumb even if the label has already reached the edge of the component and can't move further.	() => Node	undefined
onValueChanged	Will be called when a value was changed. If disableRange is set to true, the second argument should be ignored. fromUser will be true if the value was changed by user's interaction.	(low: number, high: number, fromUser: boolean) => void	undefined
onTouchStart	Will be called when user starts interaction with slider. If disableRange is set to true, the second argument should be ignored.	(low: number, high: number) => void	undefined
onTouchEnd	Will be called when user ends interaction with slider. If disableRange is set to true, the second argument should be ignored.	(low: number, high: number) => void	undefined

All the other props (e.g. style) will be passed to root container component.

A special section about permanent labels.

The label of active thumb is a hint for a user. It's not showing selected values permanently. It's a bad UI and UX to have a data for user in a moving label. If you need to show current selected values to the user, add Text components to some static place in the screen and set the text based on selected low and high values. I didn't and won't add that functionality to this component. Any issues about this will be closed immediately.