react native scroll view scroll to code example
Example 1: how to detect onend reach of scrollview in react native
import React from 'react';
import {ScrollView, Text} from 'react-native';
const isCloseToBottom = ({layoutMeasurement, contentOffset, contentSize}) => {
const paddingToBottom = 20;
return layoutMeasurement.height + contentOffset.y >=
contentSize.height - paddingToBottom;
};
const MyCoolScrollViewComponent = ({enableSomeButton}) => (
<ScrollView
onScroll={({nativeEvent}) => {
if (isCloseToBottom(nativeEvent)) {
enableSomeButton();
}
}}
scrollEventThrottle={400}
>
<Text>Here is very long lorem ipsum or something...</Text>
</ScrollView>
);
export default MyCoolScrollViewComponent;
Example 2: react native scrollview
import React from 'react';
import { StyleSheet, Text, ScrollView } from 'react-native';
export default function App() {
return (
<ScrollView style={styles.scrollView}>
<Text style={styles.text}>
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad
minim veniam, quis nostrud exercitation ullamco laboris nisi ut
aliquip ex ea commodo consequat. Duis aute irure dolor in
reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
pariatur. Excepteur sint occaecat cupidatat non proident, sunt in
culpa qui officia deserunt mollit anim id est laborum.
</Text>
</ScrollView>
);
}
const styles = StyleSheet.create({
scrollView: {
backgroundColor: 'gray',
marginHorizontal: 20,
},
text: {
fontSize: 42,
},
});
Example 3: react native scroll to
import React, { useRef } from 'react';
import { ScrollView, View, Button } from 'react-native';
export default function scrollTo() {
const scrollRef = useRef();
const handleClick = number => {
scrollRef.current.ScrollTo({
y: (100 * number),
animated: true,
};
return (
<ScrollView ref={scrollRef} >
<View style={{height: '100px'}}>
<Button onPress={() => handleClick(1) title="1"/>
</View>
<View style={{height: '100px'}}>
<Button onPress={() => handleClick(2) title="2"/>
</View>
<View style={{height: '100px'}}>
<Button onPress={() => handleClick(3) title="3"/>
</View>
<View style={{height: '100px'}}>
<Button onPress={() => handleClick(4) title="4"/>
</View>
<View style={{height: '100px'}}>
<Button onPress={() => handleClick(5) title="5"/>
</View>
</ScrollView>
);
}