[英]Flatlist is not updated?
class Parent extends React.Component {
constructor(props){
super(props);
this.state={data:[]}
}
componentDidMount(){
/ * I am loading data from the server * /
}
ratingCompleted=(id,favourite,i)=>{
if(favourite===0){
CustomerApi.AddFavourite(id);
}
else{
let newState = Object.assign({}, this.state.JSON_from_server);
newState[i].favourite = 0;
this.setState({JSON_from_server:newState,refresh:!this.state.refresh});}}
render(){
return(
<Child data={this.state.data} refresh={this.state.refresh}
ratingCompleted={this.ratingCompleted}/>
)
}
}
子組件
class Child extends React.Component {
constructor(props){
super(props);
this.state={refresh:this.props.refresh}
}
renderItem(data) {
let {item, index} = data;
let i=this.props.JSON_from_server.indexOf(item);
render(){
return(
<View>
<AirbnbRating count={1} defaultRating={item.favourite} size={30} showRating={false} onFinishRating={()=>{this.props.ratingCompleted(item.id,item.favourite,i);}}/>
</View>
)
}
}
<FlatList
keyExtractor = {( item, index ) => index.id }
data = { this.props.data}
renderItem={this.renderItem.bind(this)}
extraData={this.props.refresh}{
/ * set even extraData = {this.props}, extraData =
{this.state.refresh} or even subscribed to the parent
component so the update did not work. * /}
/>
)
}
}
當父組件中的數據更改時,子組件也不會更改。 用於父應該componentDidUpdate不起作用。 簡而言之,如果在子組件中,我該如何更新單位列表?
您應該做的是像這樣在子組件中使用ComponentWillRecieveProps
componentWillRecieveProps(nextProps){
if(JSON.stringify(this.props.data) !== JSON.stringify(nextProps.data)){
this.setState({ updateList: nextProps.data})
}
}
然后使用
this.state.updateList
用於更新FlatList
您也可以明確的子組件航行回來時,調用主要成分的功能,像這樣和呼叫的setState重新rendring
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