How to Highlight Updated Items onRefresh of FlatList - react-native

Question

I set up a FlatList with an onRefresh function to update the state when the user drags down the screen. It works properly, however I was wondering how I can highlight items in the FlatList that have been updated after the refresh.
Say, for example, I want to change the background for a few seconds for any item in the list that was updated, then return to normal.
<FlatList
data={scores}
renderItem={({item}) => (
<View style={styles.scoreContainer}>
<ScoreRow data={item.away} />
<ScoreRow data={item.home} />
</View>
)}
keyExtractor={item => item.gameID}
refreshing={isRefreshing}
onRefresh={updateScores}
/>
The best I could do was add a useEffect in the ScoreRow component to detect if something changes within that component, but that only allows me to update one component at a time, not the entire View.
const [runUpdate, setRunUpdate] = useState(false)
const [runs, setRuns] = useState(data.R)
useEffect(() => {
if(runs !== data.R) {
setRunUpdate(true)
setRuns(data.R)
setTimeout(() => setRunUpdate(false), 10000)
}
}, [data.R])
I can't figure out how to detect a change on an an item in the View of the FlatList so that I can change the entire View the way I did each component.

Answer 1

You can achieve this by using data of FlatList. You have to make an extra parameter for this.
eg:
//Method to refresh data
_refreshMethod() {
// Do your code to fetch...
...
let newDataArray = data // Data fetch from server or some thing.
let updatedArray = []
newDataArray.map((data, index) => {
data["isNewItem"] = true;
updatedArray.push(data);
});
this.setState({scores: updatedArray})
this._callTimer()
}
// Method to update new item status after a delay
_callTimer() {
setTimeout(function() {
let updatedArray = []
this.state.scores.map((data, index) => {
data["isNewItem"] = false;
updatedArray.push(data);
});
this.setState({scores: updatedArray})
}, 3000); // The time you want to do...
}
Then change the style of row based on the state value.
<FlatList
data={this.state.scores}
renderItem={({item}) => (
<View style={item.isNewItem ? styles.yourNewItemStyle : styles.scoreContainer}>
<ScoreRow data={item.away} />
<ScoreRow data={item.home} />
</View>
)}
keyExtractor={item => item.gameID}
refreshing={isRefreshing}
onRefresh={updateScores}
extraData={this.state}
/>