我有两个页面Portfolio.js和PortfolioDetails.js。在Portfolio.js文件中,我正在从api中获取数据并在列表中显示所有投资组合。当我单击投资组合时,它将带我进入PortfolioDetails屏幕,该屏幕将仅显示来自投资组合中的来自api的股票。
例如,如果我单击ID为1的投资组合,则应该从投资组合ID为1的股票api中过滤掉股票,并在屏幕上显示所有这些股票。
到目前为止,我成功获取了两个api,并且当我单击一个投资组合时,它都将投资组合id参数传递到我的PortfolioDetails屏幕。我被困在必须根据传递的参数-id过滤要显示的股票的位置。
Portfolio.js文件
export default class Portfolio extends React.Component {
static navigationOptions = ({ navigation }) => {
return {
title: "Portfolio",
header: null,
};
};
constructor(props) {
super(props);
this.state = {
loading: true,
PortfolioSource: []
};
}
componentDidMount() {
fetch("http://127.0.0.1:8000/portfolios/")
.then(response => response.json())
.then((responseJson) => {
this.setState({
loading: false,
PortfolioSource: responseJson
})
})
.catch(error => console.log(error)) //to catch the errors if any
}
FlatListItemSeparator = () => {
return (
<View style={{
height: .5,
width: "100%",
backgroundColor: "rgba(0,0,0,0.5)",
}}
/>
);
}
renderItem = (data) =>
<TouchableOpacity style={styles.list} onPress={() => this.props.navigation.push('Details', { portid: data.item.id })} >
<Text style={styles.lightText}>{data.item.id}</Text>
<Text style={styles.lightText}>{data.item.portfolio_id}</Text>
<Text style={styles.lightText}>{data.item.name}</Text>
<Text style={styles.lightText}>{data.item.description}</Text>
<Text style={styles.lightText}>{data.item.gains}</Text></TouchableOpacity>
render() {
if (this.state.loading) {
return (
<View style={styles.loader}>
<ActivityIndicator size="large" color="#0c9" />
</View>
)
}
return (
<View style={styles.container}>
<FlatList
data={this.state.PortfolioSource}
ItemSeparatorComponent={this.FlatListItemSeparator}
renderItem={item => this.renderItem(item)}
keyExtractor={item => item.id.toString()}
/>
</View>
)
}
}
PortfolioDetails.js
export default class PortfolioDetails extends React.Component {
static navigationOptions = ({ navigation }) => {
return {
title: "PortfolioDetails",
header: null,
};
};
constructor(props) {
super(props);
this.state = {
loading: true,
PortfolioDetailsdataSource: [],
};
}
componentDidMount() {
fetch(`http://127.0.0.1:8000/stocks/`)
.then(response => response.json())
.then((responseJson) => {
this.setState({
loading: false,
PortfolioDetailsdataSource: responseJson
})
})
.catch(error => console.log(error)) //to catch the errors if any
}
FlatListItemSeparator = () => {
return (
<View style={{
height: .5,
width: "100%",
backgroundColor: "rgba(0,0,0,0.5)",
}}
/>
);
}
goToPrevScreen = () => {
this.props.navigation.goBack();
}
renderItem = (data) =>
<TouchableOpacity style={styles.list}>
<Text style={styles.lightText}>{data.item.id}</Text>
<Text style={styles.lightText}>{data.item.ticker}</Text>
<Text style={styles.lightText}>{data.item.price}</Text>
<Text style={styles.lightText}>{data.item.market_cap}</Text>
<Text style={styles.lightText}>{data.item.YTD}</Text>
<Text style={styles.lightText}>{data.item.OneYear}</Text>
<Text style={styles.lightText}>{data.item.TwoYear}</Text>
<Text style={styles.lightText}>{data.item.TTM_Sales_Growth}</Text>
<Text style={styles.lightText}>{data.item.PE_Ratio}</Text>
</TouchableOpacity>
render() {
if (this.state.loading) {
return (
<View style={styles.loader}>
<ActivityIndicator size="large" color="#0c9" />
</View>
)
}
return (
<View style={styles.container}>
<FlatList
data={this.state.PortfolioDetailsdataSource}
ItemSeparatorComponent={this.FlatListItemSeparator}
renderItem={item => this.renderItem(item)}
keyExtractor={item => item.id.toString()}
/>
<Text> portid: {this.props.navigation.state.params.portid} </Text>
<Button
onPress={() => this.goToPrevScreen()}
title="go back to Portfolio"
/>
</View>
)
}
}
您可以使用.find()。例如:
PortfolioDetailsDataSource.find(item => item.id === this.props.navigation.state.params.portId)
假设ID是唯一的,这将返回所需的对象,否则将返回通过条件的第一个匹配项。