CODEWITHSUNDEEP
react-nativereact-native-flatlist
ninh_nguyen
ninh_nguyen

Reputation: 309

How to know the state of scroll (up or down) in FlatList?

How to know the state of the scroll in FlatList? Like scrolling up or scrolling down? I want to know the state scrolling up or down to show or hide header in FlatList.

Upvotes: 3

Views: 8907

Answers (3)

Jeff Gu Kang
Jeff Gu Kang

Reputation: 4889

Use the onScroll property as below. (Official)

<ScrollView onScroll={this._onScroll} />


_onScroll = (event) {
    console.log(event.nativeEvent.contentOffset.y);
},

And for guarantee getting the value of scrolling's last frame, you need to set a property scrollEventThrottle={16}.

Upvotes: 3

AmerllicA
AmerllicA

Reputation: 32757

Actually, the FlatList component can use ScrollView props so you can use below code to find out your Y position of FlatList scrollbar:

<FlatList onScroll={(e) => console.log(e.nativeEvent.contentOffset.y)} ...

You should write it on some variable and compare it with the latest change, then you can understand scrollbar moves to down or up.

Hint: It starts from zero.

Upvotes: 4

Jeff Gu Kang
Jeff Gu Kang

Reputation: 4889

Normally, the header is called StickyHeader. And there is already a option called stickyHeaderIndices which takes the index of child to make sticky header.

Official

<ScrollView
  stickyHeaderIndices={[1]}
>

Upvotes: -1

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