Basically, I want the FlatList to have a onPress functionality (to explain simply) as well as the default scrolling functionality. Right now, if I have a FlatList inside a Pressable, then I am not able to scroll through the FlatList.
I have also tried to put Pressable inside the FlatList's RenderItem component, but I have a lot of items I'll be displaying, so it's going to inefficient.
Instead of Pressable wrapping the FlatList, I learnt that we can use React Native's Gesture Responder System on a simple View to get the behavior that I require.
<View
onStartShouldSetResponder={() => true}
onResponderRelease={doSomethingFunction}
>
<FlatList
data={someData}
renderItem={renderItemComponent}
/>
</View>
Try touch handling on FlatList item parent container like below so the scrolling issue would never come again and you can easily handle the touch on each item separately
<FlatList
style={{...}}
data={[...]}
keyExtractor={(item, index) => index.toString()}
renderItem={({ item }) => (
<TouchableWithoutFeedback onPress={() => {...}}>
<View>
....
</View>
</TouchableWithoutFeedback>
)}
/>
I'm building a mobile application with React Native, and I have a ScrollView inside one of the pages.
The problem is that I have in this page a FlatList so when I go to that page, I get this error:
VirtualizedLists should never be nested inside plain ScrollViews with the same orientation... The thing is, I set the ScrollView nestedScrollEnabled to true and I also set the FlatList's scrollEnabled to false because I don't really need the scroll there (I'm using it to render items from an enum) so I thought that should fix the error, but the error still persist.
It looks like this:
<ScrollView showsVerticalScrollIndicator={false} nestedScrollEnabled={true}>
<MyComponent />
</ScrollView>
And MyComponent has this FlatList:
<FlatList
scrollEnabled={false}
style={{padding: 8,marginBottom: 8,}}
data={categories}
numColumns={numOfColumns}
keyExtractor={category => category}
renderItem={item => renderItem(item.item)}
/>
It essentially looks like this:
<SafeAreaView>
<ScrollView>
<FlatList />
<OTHER COMPONENTS />
</ScrollView>
</SafeAreaView>
Your component FlatList and ScrollView have the same orientation(vertical), so you need put your component inside a ScrollView with horizontal orientation like this:
<View>
<ScrollView nestedScrollEnabled={true} style={{ width: "100%" }} >
<View>
<ScrollView horizontal={true} style={{ width: "100%" }}>
<MyComponent />
</ScrollView>
</View>
</ScrollView>
</View>
The error is because you are using a FlatList inside a ScrollView.
The FlatList is already a scrollable component,
FlatList are accepting props like ListHeaderComponent for rendering header content and ListFooterComponent for rendering footer content. Here you can remove the ScrollView and instead of that you can only render FlatList for making whole page scrollable
You need to change your code as shown below:
const _renderHeader = () => <Text>Your Header</Text>
const _renderFooter = () => <Text>Your Footer</Text>
const _renderFooter = () => <Text>FlatList items</Text>
<SafeAreaView>
<FlatList
data={data}
keyExtractor={(item, index) => String(index)}
renderItem={_renderItem}
ListHeaderComponent={_renderHeader}
ListFooterComponent={_renderFooter}
ListFooterComponentStyle={styles.footerStyle} //If you need to give specific styles for footer component
ListHeaderComponentStyle={styles.headerStyle} //for header comp style
/>
</SafeAreaView>
You don't want to use a ScrollView when you are using a FlatList
You can check the official docs for more clarification
I'm working on a react-native app and I have to put a list of object in a Scrollview, so I use the FlatList component to do it. This is the piece of code that generates the error:
<ScrollView contentContainerStyle={style}>
Other components
<FlatList
style={style}
data={data}
scrollEnabled={false}
keyExtractor={(item, index) => index.toString()}
renderItem={({ item, index}) => (somethings)}
/>
Other components
</ScrollView>
The complete error is: VirtualizedLists should never be nested inside plain ScrollViews with the same orientation because it can break windowing and other functionality - use another VirtualizedList-backed container instead.
Avoid using FlatList with the same orientation. Instead, restructure your code like this --
<ScrollView contentContainerStyle={style}>
Other components
{
data.map((item)=> <Somthing item={item}/>)
}
Other components
</ScrollView>
Flatlist has its own ScrollView you can scroll through the list using that so there is no need to put a flatlist into a ScrollView that is why its giving a warning, the both scrollview will clash and one of them (mostly the parent one) works.
The error is self explanatory and it should be in a developers best interest to avoid these kind of things even when it's just a false alarm.
Your particular situation could use the following solution:
<FlatList
data={data}
keyExtractor={(item, index) => `key-${index}`}
ListHeaderComponent={() => (
<SomeComponents>
...Some components those need to be on top of the list
</SomeComponents>
)}
ListFooterComponent={() => (
<SomeComponents>
...Some components those need to be below the list
</SomeComponents>
)}
renderItem={({ item, index}) => (somethings)}
/>
Another note, if you need more complex list that needs header and footer for the list itself, you can try SectionList.
Your component FlatList and ScrollView have the same orientation(vertical), so you need put your component inside a ScrollView with horizontal orientation like this:
<View>
<ScrollView nestedScrollEnabled={true} style={{ width: "100%" }} >
<View>
<ScrollView horizontal={true} style={{ width: "100%" }}>
<FlatList />
</ScrollView>
</View>
</ScrollView>
</View>
Solution 1: Use FlatList props ListHeaderComponent and create all of your page top section in that. Something like this:
This will not show any warning or error.
Solution 2:
Because only parent view will scroll (ScrollView) and not the child FlatList, so to get rid of the warning you can pass a prop scrollEnabled={false} to the FlatList.
If it doesn't go then import LogBox from react-native and write this in your component
useEffect(() => {
LogBox.ignoreLogs(["VirtualizedLists should never be nested"])
}, [])
hopefully, the warning will be removed.
Anyone want to solve this issue can use a custom VirtualizedScrollView like this:
import React from 'react';
import { FlatList } from 'react-native';
const VirtualizedScrollView = props => {
return (
<FlatList
{...props}
data={[]}
keyExtractor={(e, i) => 'dom' + i.toString()}
ListEmptyComponent={null}
renderItem={null}
ListHeaderComponent={() => (
<>{props.children}</>
)}
/>
);
};
export default VirtualizedScrollView;
Then if you use FlatList inside VirtualizedScrollView, it won't get the warning/error.
<VirtualizedScrollView>
<FlatList
/*--- your props ---*/
/>
</VirtualizedScrollView>
There is a npm package where I get this code, you can also use this package
Solution:
I have also encountered same problem with FlatList. Then the package below solved my problem.
'react-native-virtualized-view'
import { ScrollView } from 'react-native-virtualized-view'
if ScrollView is Vertical change Flatlist Horizontal
<ScrollView >
<FlatList
horizontal
data={lenders}
keyExtractor={(_, index) => index}
renderItem={(item) => {
return <Text>item</Text>
}}
/>
You can solve the 2 vertical ones(I'm assuming their side by side, separated with a segemented control?) by using the same flat list and switching out the data when it's switched. If they're just two vertical flat list's one after another use the SectionList.
For the horizontal one you can try putting the Horizontal FlatList in the ListHeaderComponent of the vertical FlatList and see what happens. It can be janky if you use a vertical FlatList in a vertical scroll view but maybe with two different axis it might be ok. The other option is two only show a few items in the horizontal scrollview and have a "Show More".
The last option is too re design/rethink the page so it's not doing so much. On mobile less is more and developers/designers like to get in the mindset of porting desktop thinking onto mobile. Might be worth a shot.
I used the SectionList approach to solve this & wanted to post a code example because I found the Section data required by React Native to be clear but also quite prescriptive.
renderList = ({empty, posts}: {empty: boolean, posts: Array<Object>}) => (
<SectionList
sections={[
{type: 'MAP', data: [{}]}, // Static sections.
{type: 'PROFILE', data: [{}]},
{type: 'POSTS', data: posts} // Dynamic section data replaces the FlatList.
]}
keyExtractor={(item, index) => index}
renderItem={({item, section}) => {
switch (section.type) {
// Different components for each section type.
case 'MAP':
return <MapView />;
case 'PROFILE':
return <Profile />;
case 'POSTS':
return <Post item={item} />;
default:
return null;
}
}}
ItemSeparatorComponent={() => <Separator />}
ListFooterComponent={() => <>{empty && <EmptyList />}</>}
/>
);
What's nice is that the content feels logically quite separate, so you can add sections easily or have different dynamic data sources.
(If you're building a form & want better keyboard handling, you could also try a KeyboardAwareSectionList from react-native-keyboard-aware-scroll-view.)
Flatlist has an integrated scrollview itself, so you can resolve this error by removing ScrollView Component, And let just the Fatlist component
Error ? you are trying to render a FlatList component inside a scrollview component, this is what is throwing the warning.
solution Render the components using Flatlist's ListHeaderComponent={} prop, i.e in your flatlist add the prop as follows
const FlatList_Header = () => {
return (
<View style={{
height: 45,
width: "100%",
backgroundColor: "#00B8D4",
justifyContent: 'center',
alignItems: 'center'
}}
>
<Text style={{ fontSize: 24, color: 'white' }}> Sample FlatList Header </Text>
</View>
);
}
<FlatList
data={BirdsName}
renderItem={({ item }) => <ItemRender name={item.name} />}
keyExtractor={item => item.id}
ItemSeparatorComponent={ItemDivider}
**ListHeaderComponent={FlatList_Header}**
ListHeaderComponentStyle={{ borderBottomColor: 'red', borderBottomWidth: 2 }}
/>
Note the use of the ListHeaderComponent in the code above, that should supress the warning.
Use flatList like this ListHeaderComponent and ListFooterComponent:
<FlatList ListHeaderComponent={
<ScrollView
style={styles.yourstyle}
showsVerticalScrollIndicator={false}
>
<View style={styles.yourstyle}>
</View>
</ScrollView>
}
data={this.state.images}
renderItem={({ item, index }) => {
return (
<View
style={styles.yourstyle}
>
<Image
source={{
uri: item,
}}
style={styles.yourstyle}
resizeMode={"contain"}
/>
<Text
numberOfLines={2}
ellipsizeMode="tail"
style={styles.yourstyle}
>
{item.name}
</Text>
</View>
);
}}
keyExtractor={({ name }, index) => index.toString()}
ListFooterComponent={
<View style={styles.yourstyle}></View>
}
/>
In my case it was happening due to nesting of ScrollView.
Try replacing some of the ScrollView from children components with React.Fragment.
The solution is very simple, please do not put the Flatlist component in the ScrollView.
They both have the same functionality but Flatlist has advantages and is more stable to use.
I'm trying to make use of CellRendererComponent in Flatlist (rn 0.62) to let the zIndex prop to work, and it does, but all the data is rendered at once.
If I try to set initialNumToRender={number} and windowSize={number} then it limits the render, but doesn't render after the number set in those props.
<FlatList
style={{ flex: 1 }}
horizontal
showsHorizontalScrollIndicator={false}
data={data}
CellRendererComponent={renderGanttCell}
keyExtractor={ganttKeyExtractor}
bounces={false}
scrollEventThrottle={16}
initialNumToRender={3}
windowSize={9}
/>
Changing CellRendererComponent to renderItem works without the zIndex, but all the data is lazy rendered.
Any work around to keep CellRendererComponent and lazy render the rest of the data?
I know this is late, but for anyone else (like me) arriving here. React Native VirtualizedList calls CellRendererComponent like so:
<CellRendererComponent
{...this.props}
style={cellStyle}
onLayout={onLayout}>
{element}
{itemSeparator}
</CellRendererComponent>
Your custom CellRendererComponent has to implement at least the onLayout prop:
function MyCustomCellRenderer(props) {
return(
<View onLayout={props.onLayout}>
...etc
</View>
)
}
React Native, Using PanResponder View as a parent and having flatlist as a child of the view, without PanResponder, flatlist scrolling is working fine but with PanResponder, flatlist scrolling is not working.
I dont find proper solution, but workaround is wrap the flatlist items in TouchableOpacity , it will make flatlist scrollable.
If you don't like TouchableOpacity's opacity then you can set activeOpacity to 1.
Example:
<View {...this.gestureHandlers.panHandlers} style={styles.container}>
<FlatList
horizontal={true}
data={this.state.FlatlistData}
renderItem={({ item }) => {
return (
<TouchableOpacity activeOpacity={1} style={styles.itemsStyle}>
{/* Your core view here */}
</TouchableOpacity>
)
}}
/>
</View>