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react-native-read-more

React native library to show text in a condensed way and expand when needed. Can be used with native or expo on all platforms. Supports TS/JS both. It's a pure JS solution and does not requires any native dependencies.

Installation

npm i @fawazahmed/react-native-read-more --save

or with yarn

yarn add @fawazahmed/react-native-read-more

Usage

import React from 'react';
import {SafeAreaView, StyleSheet, View} from 'react-native';
import ReadMore from '@fawazahmed/react-native-read-more';

const Home = () => {
  return (
    <SafeAreaView style={styles.safe}>
      <View style={styles.root}>
        <ReadMore numberOfLines={3} style={styles.textStyle}>
          {
            "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum."
          }
        </ReadMore>
      </View>
    </SafeAreaView>
  );
};

const styles = StyleSheet.create({
  safe: {
    flex: 1,
  },
  root: {
    flex: 1,
    padding: 16,
  },
  textStyle: {
    fontSize: 14,
  },
});

export default Home;

Props

Prop	Type	Required	Note
style	object or array	no	text style
seeMoreText	string	no	defaults to See more
seeMoreStyle	object or array	no	text style for See more text
seeLessText	string	no	defaults to See less
seeLessStyle	object or array	no	text style for See less text
ellipsis	string	no	defaults to ...
wrapperStyle	object or array	no	style for wrapper View
numberOfLines	number	no	defaults to 3
animate	bool	no	defaults to true => applies a subtle animation to see more and see less text, not the complete text itself
customTextComponent	React component	no	defaults to Text
expandOnly	bool	no	defaults to false => hide see less option similar to a linkedIn post
onExpand	func	no	optional callback executed when expanded
onCollapse	func	no	optional callback executed when collapsed
onReady	func	no	optional callback executed when see more placement measurements are completed, this function will pass 2 arguments ({ canExpand, expandedLinesCount }), where canExpand is a boolean specifying if text can be expanded and expandedLinesCount is a number indicating the number of lines when text is in expanded state.
collapsed	bool	no	Control collapsed state programatically see issue
debug	bool	no	print debug logs to examine
seeMoreContainerStyleSecondary	object	no	Incase of text overlap, pass { position: 'relative' } see issue (not recommended)
onSeeMore	func	no	when a function is passed, will disable the default See More toggling and use the custom callback instead. Useful to do things like open a modal instead of expanding text when See More is pressed.
onSeeLess	func	no	when a function is passed, will disable the default See Less toggling and use the custom callback instead. Useful to do things like open a modal instead of collapsing text when See Less is pressed.

Any additional props are passed down to underlying Text component.

Usage with HTML

HTML rendering is not part of this package, but can be done easily with the help of any custom html to text library. For sample code, refer to this issue

Run example

git clone https://github.com/fawaz-ahmed/react-native-read-more.git
cd react-native-read-more/example
yarn install # or npm install

# to run on iOS
yarn ios

#to run on android
yarn android

Why another library ?

This module will calculate where to position See more and See less within the same paragraph instead of occupying another line. It is a drop-in replacement for Text component and you can control when to apply the see more functionality by configuring the numberOfLines prop. Moreover, you can also pass your own custom implementation of Text component like ParsedText (sample code) etc.

Testing with Jest

Make sure to add jest.useFakeTimers(); to your test file. See Stackoverflow post and jest timer mocks

Seeing issues or any feedback or feature suggest ?

Create an issue with github.

Troubleshooting

• If you observe See more shown always in android, pass prop allowFontScaling={false}, refer to this issue
• If you have any nested components other than Text, refer to this issue

Known issues

Android only if numberOfLines with a value of 1 is passed down as a prop, text in android devices will overlap at the end of line. This is an issue in react-native where text from other lines concatenates into the first one even if we add \n to the first line, where the lines returned from onTextLayout indicates a different response. To overcome this issue, use numberOfLines greater than 1.