react-native-flatlist
React native flatlist initial scroll to bottom
I had similar issue. If you want to have you chat messages start at the bottom, you could set “inverted” to true and display your messages and time tag in an opposite direction. Check here for “inverted” property for FlatList. https://facebook.github.io/react-native/docs/flatlist#inverted If you want to have you chat messages start at the top, which is … Read more
React Native FlatList not scrolling to end
Add style={{flex: 1}} for each View element who is a parent for FlatList.
Flatlist getItemLayout usecase
React Native FlatList optimises list view performance by only rendering rows that are currently visible on the screen, and unmounting rows that have been scrolled past. In order for FlatList to be able to do this, it needs to know the total height of the rows above the currently visible viewport, so it can set … Read more
FlatList ScrollView Error on any State Change – Invariant Violation: Changing onViewableItemsChanged on the fly is not supported
Based on @woodpav comment. Using functional components and Hooks. Assign both viewabilityConfig to a ref and onViewableItemsChanged to a useCallback to ensure the identities are stable and use those. Something like below: const onViewCallBack = React.useCallback((viewableItems)=> { console.log(viewableItems) // Use viewable items in state or as intended }, []) // any dependencies that require the … Read more
How to change height of in react native?
adding flexGrow: 0 to the flatList style worked for me, so it will be: flatList: { height: 50, backgroundColor: ‘red’, flexGrow: 0 }
Scroll to end of FlatList after displaying the keyboard
I’m making a chat component and I want about the same things. Did it like this: <FlatList ref={ref => this.flatList = ref} onContentSizeChange={() => this.flatList.scrollToEnd({animated: true})} onLayout={() => this.flatList.scrollToEnd({animated: true})} … /> Keyboard popping up triggers a layout, so that’s fixed. New chat messages arriving trigger content changes, so it also scrolls to the bottom … Read more
React Native – Use a keyExtractor with FlatList
“VirtualizedList: missing keys for items, make sure to specify a key property on an item or provide a custom keyExtractor” This is a warning that the elements of the list are missing keys. These unique keys are what allow the VirtualizedList (which is what FlatList is built on) to track items and are really important … Read more
React-Native scroll to top with Flatlist
The correct syntax is this.flatListRef.scrollToOffset({ animated: true, offset: 0 }); and you can also use scrollToIndex
TypeScript React Native Flatlist: How to give renderItem the correct type of it’s item?
I know it’s an old question but people googling it might still appreciate it. import { FlatList, ListRenderItem } from ‘react-native’ /* . . . */ renderItem: ListRenderItem<Emoticon> = ({ item }) => ( <ListItem title={item.name} checkmark={item.checked} /> );