What is Section list?

What is Section list?

The React Native SectionList component is a list view component which sets the list of data into broken logical section. The broken data can be implemented using its section header prop renderSectionHeader. To implement the SectionList component, we need to import SectionList from 'react-native' library.

How do you create a list in react native?

Create a list using 'React Native Elements'

  1. react-native init listApp && cd listApp. To begin, install the react-native-elements lib:
  2. npm install react-native-elements --save. ...
  3. npm install react-native-vector-icons --save. ...
  4. react-native link react-native-vector-icons. ...
  5. npm install axios --save. ...
  6. react-native run-ios. ...
  7. react-native run-android.

How do you optimize Flatlist react native?

8 ways to optimize React native FlatList performance

  1. Avoid arrow functions inline for renderItem. ...
  2. Don't use 1080P HD images in the list. ...
  3. Optimize maxToRenderPerBatch prop. ...
  4. Optimize windowSize prop. ...
  5. Use getItemLayout to optimize flatlist react native. ...
  6. Use fewer Views in your list item to optimize flatlist react native. ...
  7. Use keyExtractor prop. ...
  8. Use PureComponent or memo carefully.

What is onEndReachedThreshold?

In 2020, onEndReachedThreshold represents the number of screen lengths you should be from the bottom before it fires the event. I use onEndReachedThreshold={2} to fire onEndReached when I'm two full screen lengths away.

How do you use extraData FlatList?

For quick and simple solution Try:

  1. set extra data to a boolean value. extraData={this.state.refresh}
  2. Toggle the value of boolean state when you want to re-render/refresh list this.setState({ refresh: ! this.state.refresh })

Is FlatList scrollable?

cardcontainer , that should let you scroll. The FlatList/ScrollView contentContainerStyle prop wraps all the child components—what's "inside" the FlatList if you will—and should never have a defined height or flex value. If you need to set a flex: 1 for the FlatList itself use style={{flex: 1}} instead. Cheers!

How do you get the FlatList index?

In order to get an index of FlatList item - spread the itemData inside renderItem. For those who want an easy way, react-native-swiper-flatlist provides getCurrentIndex and OnIndexChange methods to find index.

What is FlatList?

Flatlist is the easiest way to render a scrollable list of items. We just have to pass the data (as an array) without any formatting to it and it will render the items. Flatlist works efficiently with large data as it renders only those items that are displaying on the screen, and not all the items at once.

What is keyExtractor in FlatList?

Without setting this prop, FlatList would not know it needs to re-render any items because it is a PureComponent and the prop comparison will not show any changes. keyExtractor tells the list to use the id s for the react keys instead of the default key property.

What is SafeAreaView?

The purpose of SafeAreaView is to render content within the safe area boundaries of a device. It is currently only applicable to iOS devices with iOS version 11 or later.

What is the difference between ScrollView and FlatList in react native?

ScrollView renders all its react child components at once, but this has a performance downside. ... FlatList renders items lazily, when they are about to appear, and removes items that scroll way off screen to save memory and processing time.

How do I scroll in react JS?

Scroll to Item from within the List Component

  1. import React from 'react'; const list = [ ... ]; const List = () => (
    • const ref = React. createRef(); const handleClick = () => ref. current. scrollIntoView({ behavior: 'smooth', block: 'start',
    • }); return (