My problem is that my flat list is not being updated when I add an element to "entriesPerDay" in my Redux store. Both home screen and the Flat List have state mapped to props. I have tried: - passing the data to EntriesList through props from Home Screen - using the state from reducer as data provider of the EntriesList
Nothing seem to be working and the shouldComponentUpdate or any other relevant function is never called. REDUCER:
case NEW_ENTRY_LOCAL:
let newState = {...state};
newState.entriesPerDay.push(action.entry);
return{
...newState
}
HOME SCREEN:
(...)
render() {
return (
<View style={{ flex: 1, alignItems: 'flex-start', justifyContent: 'flex-start' }}>
<NavBar onItemPressed={this.onItemPressedHandler}/>
<DayPicker onDatePicked={this.onDatePickedHandler} />
<TotalTime totalTime={this.props.total} />
<EntriesList entries={this.props.entriesPerDay}/>
<Timer onEntryEnd={this.onEntryEndHandler} onTimeChanged={this.onTimeChangedHandler} onEntryCreate={this.onEntryCreateHandler}/>
<Button title="clickkk" onPress={this.onItemPressedHandler}>CLICK ME</Button>
</View>
);
}
FLAT LIST:
class entriesList extends React.Component {
componentDidMount()
{
reactMixin(entriesList, TimerMixin);
this.timer = setInterval(() => {
console.log(this.props.entriesPerDay);
}, 3000);
}
componentWillUnmount() {
clearInterval(this.timer);
}
shouldComponentUpdate(nextProps, nextState)
{
console.log("new props" + nextProps);
return true;
}
render()
{
return (
<FlatList style={styles.full}
data={this.props.entries}
extraData={this.props.entriesPerDay}
renderItem={
(info)=>(
<ListItem key={info.item.key}
startDateTime={info.item.startDateTime}
endDateTime = {info.item.endDateTime}
description = {info.item.description}
prevEntryEnd = {info.item.prevEntryEnd}
nextEntryStart = {info.item.nextEntryStart}
total = {info.item.totalTime}
/>
)
}
/>
);
}
}
const mapStateToProps = state => {
return {
serverCopy : state.entries.serverCopy,
entriesPerDay : state.entries.entriesPerDay,
pickedDate : state.entries.pickedDate,
total: state.entries.total,
local: state.entries.local
};
};
const mapDispatchToProps = dispatch => {
return {
onPickDate: (day) => dispatch(pickDay(day)),
onDataSet: (data) => dispatch(setData(data)),
onNewEntryLocal: (entry) => dispatch(newEntryLocal(entry)),
onEndEntryLocal: (entry) => dispatch(endEntryLocal(entry)),
};
};
export default connect(mapStateToProps, mapDispatchToProps)(entriesList)
;
Try :
case NEW_ENTRY_LOCAL:
let newEntriesPerDay = state.entriesPerDay.concat(action.entry);
return {
...state,
entriesPerDay: newEntriesPerDay
}
It is because entriesPerDay
was just beeing copied by reference in the newState in your previous example. redux
and react
compare the reference and see that it's the same so no re-render will happen. That's why you should copy it manually.
Note : Use concat instead of push to return a new array (new reference)
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