How to highlight search results in React-Native FlatList? - react-native

Question

I'm newbie in React-native. I need to highlight the search results in my FlatList while I'm typing in search bar. There are 2 componenrs: react-native-highlight-words and react-native-text-highlight , But I cant figure out how to make use of them!
here is my code:
import React, { Component } from 'react';
import {StyleSheet, Text, View, FlatList, TouchableOpacity } from 'react-native';
import { List, ListItem, SearchBar } from 'react-native-elements';
import DropdownMenu from 'react-native-dropdown-menu';
import {Header, Left, Right, Icon} from 'native-base'
var SQLite = require('react-native-sqlite-storage')
var db = SQLite.openDatabase({name: 'test.sqlite', createFromLocation: '~dictionary.sqlite'})
var data = [["English", "Arabic", "Persian"]];
export default class App extends Component {
constructor(props) {
super(props)
this.state = {record: [], arrayholder : [], query:''};
db.transaction((tx) => {
tx.executeSql('SELECT * FROM tblWord', [], (tx, results) => {
let row = results.rows.item();
arrayholder = results.rows.raw()
record = results.rows.raw()
this.setState({arrayholder: arrayholder})
this.setState({ record: record })
}});});
}
searchFilterFunction = text => {
var newData = this.state.arrayholder;
newData = this.state.arrayholder.filter(item => {
const itemData = item.word_english.toLowerCase()
const textData = text.toLowerCase()
return itemData.indexOf(textData) > -1 });
this.setState({query: text,record: newData });
};
render() {
return (
<View style = {styles.container}>
<Header style={styles.headerStyle}>
...
</Header>
<View style={styles.menuView}>
<DropdownMenu
bgColor={"#B38687"}
activityTintColor={'green'}
titleStyle={{color: '#333333'}}
handler={(selection, row) => this.setState({text4: data[selection][row]})}
data={data}
>
</DropdownMenu>
</View >
<View >
<View style={styles.searchBarView}>
<SearchBar
placeholder="Search"
lightTheme
value = {this.state.query}
onChangeText={text => this.searchFilterFunction(text)}
autoCorrect={false}
inputStyle={{backgroundColor: 'white'}}
containerStyle={{backgroundColor: 'white', borderWidth: 1, borderColor:'#B38687', }}
/>
</View>
<View style={styles.flatListVew}>
<List containerStyle={{ flexDirection: 'column-reverse', borderTopWidth: 0, borderBottomWidth: 0 }} >
<FlatList
data={this.state.record}
keyExtractor={((item, index) => "itemNo-" + index)}
renderItem={({item}) => (
<ListItem
roundAvatar
onPress={() => {this.props.navigation.navigate('Screen2', {data: (item.word_english +'\n' + item.word_arabic)} ); }}
title={item.word_english}
containerStyle={{ borderBottomWidth: 0 }}
/> )}
/>
</List>
</View>
</View>
</View>);}
}
const styles = StyleSheet.create({
...
I want the results to look like this:
Any help would be greatly appreciated.

Answer 1

You can pass text or custom view to ListItem component as props for title. I am using React Native Highlight Words to highlight text as you stated.
add React Native Highlight Words by add the below line:
import Highlighter from 'react-native-highlight-words';
Update code for ListItem component for desired result:
<ListItem
roundAvatar
onPress={() => {this.props.navigation.navigate('Screen2', {data: (item.word_english +'\n' + item.word_arabic)} ); }}
title={
<Highlighter
highlightStyle={{backgroundColor: 'yellow'}}
searchWords={[this.state.query]}
textToHighlight={item.word_english}
/>}
containerStyle={{ borderBottomWidth: 0 }}
/>

Answer 2

You can highlight using your own styles.
Here is a simple example:
const myList = [{ text: 'Hi', id: 1 }, ... ]
class List extends Component {
this.state = { highlightedId: undefined }
render() {
return (
<FlatList
data={myList}
renderItem={({item}) => <Text style={item.id === this.state.highlightedId ? styles.hightlighted : undefined}>{item.text}</Text>}
/>
)
}
}
const styles = StyleSheet.create({
highlighted: {
backgroundColor: "yellow"
}
})
In your case you can adjust the containerStyle of the <ListItem />.

Answer 3

handleChangeText = param => {
const {categoryList} = this.state;
const regEx = "\\s*(" + param + ")\\s*"
const validator = new RegExp(regEx, 'i');
let filterData = [];
//here is categorylist is the data supplied to flatlist.
categoryList.forEach(item => {
let flag = validator.test(item.teamtype);
if (flag) {
//here set the highlighting color
}
})
};
Call the above function onChangeText() of your search field.