React native ScrollView scroll to position

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The simplest way of scroll to position in react native using ScrollView ref.

Introduction

The simplest way of auto-scroll store scrolled position on our state and use in the vertical and horizontal auto-scroll.

but how it is possible auto-scroll in react native?

for auto-scroll, we are use scrollView as a ref, and ScrollView provides scrollTo function for scrolling on any position in a scroll view.

First Create Refs on Class

Refs provide a way to access DOM nodes or React elements created in the render method. ~ from the react-native document

Copy 
1class MyComponent extends React.Component {
2  constructor(props) {
3    super(props);
4    this.ScrollView = React.createRef();
5  }
6}

Store scrolled height and width on state

State generally use in react-native to store data.

Copy 
1<ScrollView
2  showsVerticalScrollIndicator={false}
3  // define ref
4  ref={ref => (this.ScrollView = ref)}
5  // use for store scrolled value
6  onScroll={event =>
7      this.setState({horizontalScroll:event.nativeEvent.contentOffset.x, VerticalScroll:event.nativeEvent.contentOffset.y})
8  }
9>
10// Your list data
11</ScrollView>

Use ScrollView ref to scroll to a destination position

Copy 
1// auto scroll function
2autosScroll(){
3
4   // X use for horizontal
5   let horizontalScroll = this.state.horizontalScroll;
6
7   // Y use for Vertical
8   let VerticalScroll = this.state.VerticalScroll;
9
10  this.ScrollView.scrollTo({x: horizontalScroll, y: VerticalScroll, animated: true});
11}

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