React Native - getItemLayout setting for multiple columns
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I want to implement a scrollToIndex function for my flatlist. However, it prompts and out of range error. I am wondering is it related to getItemLayout inside flatlist if it is single column only.
getItemLayout = (data, index) => (
length: win.width*0.335, offset: (win.width*0.335)*index, index
)
render()
return(
<FlatList
numColumns=3
ref=(ref) => this.dataList = ref;
renderItem=( item, index ) => this._renderItem(item, index)
data=this.state.data
extraData=this.state
getItemLayout=this.getItemLayout//required for scrollToIndex
style= flex: 1, paddingBottom: win.height * 0.02
keyExtractor=(item, index) => index
/>
)
react-native
asked Nov 14 '18 at 11:27
rayray
6119
add a comment |
I want to implement a scrollToIndex function for my flatlist. However, it prompts and out of range error. I am wondering is it related to getItemLayout inside flatlist if it is single column only.
getItemLayout = (data, index) => (
length: win.width*0.335, offset: (win.width*0.335)*index, index
)
render()
return(
<FlatList
numColumns=3
ref=(ref) => this.dataList = ref;
renderItem=( item, index ) => this._renderItem(item, index)
data=this.state.data
extraData=this.state
getItemLayout=this.getItemLayout//required for scrollToIndex
style= flex: 1, paddingBottom: win.height * 0.02
keyExtractor=(item, index) => index
/>
)
react-native
asked Nov 14 '18 at 11:27
rayray
6119
add a comment |
I want to implement a scrollToIndex function for my flatlist. However, it prompts and out of range error. I am wondering is it related to getItemLayout inside flatlist if it is single column only.
getItemLayout = (data, index) => (
length: win.width*0.335, offset: (win.width*0.335)*index, index
)
render()
return(
<FlatList
numColumns=3
ref=(ref) => this.dataList = ref;
renderItem=( item, index ) => this._renderItem(item, index)
data=this.state.data
extraData=this.state
getItemLayout=this.getItemLayout//required for scrollToIndex
style= flex: 1, paddingBottom: win.height * 0.02
keyExtractor=(item, index) => index
/>
)
react-native
asked Nov 14 '18 at 11:27
rayray
6119
I want to implement a scrollToIndex function for my flatlist. However, it prompts and out of range error. I am wondering is it related to getItemLayout inside flatlist if it is single column only.
getItemLayout = (data, index) => (
length: win.width*0.335, offset: (win.width*0.335)*index, index
)
render()
return(
<FlatList
numColumns=3
ref=(ref) => this.dataList = ref;
renderItem=( item, index ) => this._renderItem(item, index)
data=this.state.data
extraData=this.state
getItemLayout=this.getItemLayout//required for scrollToIndex
style= flex: 1, paddingBottom: win.height * 0.02
keyExtractor=(item, index) => index
/>
)
react-native
react-native
asked Nov 14 '18 at 11:27
rayray
6119
asked Nov 14 '18 at 11:27
rayray
6119
asked Nov 14 '18 at 11:27
rayray
6119
asked Nov 14 '18 at 11:27
rayray
6119
asked Nov 14 '18 at 11:27
rayray
6119
6119
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
React Native FlatList getItemLayout for multiple columns
The idea is the FlatList just needs to know for this index, how tall is it (length), how do I jump to it (offset) and pass back the current index. Not sure why they need the index as that doesn't change.
const FIXED_ITEM_HEIGHT = 100
const NUM_COLUMNS = 3
getItemLayout = (data, index) => (
length: FIXED_ITEM_HEIGHT,
offset: FIXED_ITEM_HEIGHT * Math.floor(index / NUM_COLUMNS),
index
)
HOWEVER... This feature doesn't work as it's supposed to. It fires on scroll but the index doesn't change. There are many known issues at the time of this writing so don't use it in production.
https://github.com/facebook/react-native/issues/20467
So currently Facebook gets an unlike on this feature.
answered Feb 23 at 17:24
Jason SebringJason Sebring
13.5k66364
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
React Native FlatList getItemLayout for multiple columns
The idea is the FlatList just needs to know for this index, how tall is it (length), how do I jump to it (offset) and pass back the current index. Not sure why they need the index as that doesn't change.
const FIXED_ITEM_HEIGHT = 100
const NUM_COLUMNS = 3
getItemLayout = (data, index) => (
length: FIXED_ITEM_HEIGHT,
offset: FIXED_ITEM_HEIGHT * Math.floor(index / NUM_COLUMNS),
index
)
HOWEVER... This feature doesn't work as it's supposed to. It fires on scroll but the index doesn't change. There are many known issues at the time of this writing so don't use it in production.
https://github.com/facebook/react-native/issues/20467
So currently Facebook gets an unlike on this feature.
answered Feb 23 at 17:24
Jason SebringJason Sebring
13.5k66364
add a comment |
React Native FlatList getItemLayout for multiple columns
The idea is the FlatList just needs to know for this index, how tall is it (length), how do I jump to it (offset) and pass back the current index. Not sure why they need the index as that doesn't change.
const FIXED_ITEM_HEIGHT = 100
const NUM_COLUMNS = 3
getItemLayout = (data, index) => (
length: FIXED_ITEM_HEIGHT,
offset: FIXED_ITEM_HEIGHT * Math.floor(index / NUM_COLUMNS),
index
)
HOWEVER... This feature doesn't work as it's supposed to. It fires on scroll but the index doesn't change. There are many known issues at the time of this writing so don't use it in production.
https://github.com/facebook/react-native/issues/20467
So currently Facebook gets an unlike on this feature.
answered Feb 23 at 17:24
Jason SebringJason Sebring
13.5k66364
add a comment |
React Native FlatList getItemLayout for multiple columns
The idea is the FlatList just needs to know for this index, how tall is it (length), how do I jump to it (offset) and pass back the current index. Not sure why they need the index as that doesn't change.
const FIXED_ITEM_HEIGHT = 100
const NUM_COLUMNS = 3
getItemLayout = (data, index) => (
length: FIXED_ITEM_HEIGHT,
offset: FIXED_ITEM_HEIGHT * Math.floor(index / NUM_COLUMNS),
index
)
HOWEVER... This feature doesn't work as it's supposed to. It fires on scroll but the index doesn't change. There are many known issues at the time of this writing so don't use it in production.
https://github.com/facebook/react-native/issues/20467
So currently Facebook gets an unlike on this feature.
answered Feb 23 at 17:24
Jason SebringJason Sebring
13.5k66364
React Native FlatList getItemLayout for multiple columns
The idea is the FlatList just needs to know for this index, how tall is it (length), how do I jump to it (offset) and pass back the current index. Not sure why they need the index as that doesn't change.
const FIXED_ITEM_HEIGHT = 100
const NUM_COLUMNS = 3
getItemLayout = (data, index) => (
length: FIXED_ITEM_HEIGHT,
offset: FIXED_ITEM_HEIGHT * Math.floor(index / NUM_COLUMNS),
index
)
HOWEVER... This feature doesn't work as it's supposed to. It fires on scroll but the index doesn't change. There are many known issues at the time of this writing so don't use it in production.
https://github.com/facebook/react-native/issues/20467
So currently Facebook gets an unlike on this feature.
answered Feb 23 at 17:24
Jason SebringJason Sebring
13.5k66364
edited Feb 23 at 19:16
answered Feb 23 at 17:24
Jason SebringJason Sebring
13.5k66364
answered Feb 23 at 17:24
Jason SebringJason Sebring
13.5k66364
answered Feb 23 at 17:24
Jason SebringJason Sebring
13.5k66364
13.5k66364
add a comment |
add a comment |
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