您如何按交易在本机中创建的日期对交易列表进行分组？

Question

我有一个 JSON 测试交易列表，我可以显示它们及其执行日期，但我希望能够对这些进行分组，例如所有已执行的交易今天列在一个显示 'Today' 的横幅下，而在同一日期执行的其他交易则在显示该日期的横幅下。我试图想办法实现这一点，但我很挣扎，任何帮助将不胜感激。

下面是我试图在其中创建此功能的组件。

import React from 'react';
import {
  Text,
  SafeAreaView,
  StatusBar,
  ActivityIndicator,
  FlatList,
  View,
  List,
  Image,
  SectionList,
} from 'react-native';
import moment from 'moment';
import transactions from '../testdata/transactions.json';
import Icon from 'react-native-ionicons'

var datetest = [moment(transactions[0].addedtime).calendar()];
 
moment.locale('en-uk', {
  calendar: {
    lastDay: '[Yesterday ]',
    sameDay: '[Today]',
    nextDay: '[Tomorrow]',
    lastWeek: 'L',
    nextWeek: 'dddd',
    sameElse: 'L',
  },
});

class TransactionsComponent extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
      isLoading: true,
      dataSource: [],
      epochDate: [],
    };
  }

  componentDidMount() {
    this.setState({
      isLoading: false,
      dataSource: transactions,
      epochDate: datetest,
    });
  }

  
  renderSeparator = () => {
    return (
      <View
        style={{
          height: 0,
          width: '100%',
          backgroundColor: '#F5F5F5 ',
          marginLeft: '0%',
        }}
      />
    );
  };
  

  render() {
    if (this.state.isLoading) {
      return (
        <View style={{flex: 1, padding: 20}}>
          <ActivityIndicator />
        </View>
      );
    }
  }


 

  render() {
    return (
      <View style={{width: '100%'}}>
        <FlatList
          data={this.state.dataSource}
          renderItem={({item}) => (
            <View
              style={{
                flex: 1,
                flexDirection: 'column',
                borderBottomColor: '#5AA8C8',
                borderBottomWidth: 1,
                paddingBottom: 10,
              }}>

              
              { <View style={{marginLeft: '3%'}}>
                <Text style={{fontWeight: 'bold', fontSize: 18}}>
                  {moment(item.addedtime).calendar()}
                </Text>
              </View> }
              <View style={{marginLeft: '5%', flexDirection: 'row', flex: 2,}}>
                <View
                  style={{flexDirection: 'row', alignItems: 'center', flex: 3}}>
                  <Image
                    style={{width: 40, height: 40}}
                    source={{uri: item.iconblob}}
                  />
                
                  <Text
                    style={{fontSize: 16, color: 'grey', fontWeight: 'bold'}}>
                    {'  '}
                    {item.merchantname}
                  </Text>
                </View>
                <View
                  style={{
                    flex: 1,
                    flexDirection: 'row',
                    alignItems: 'center',
                    justifyContent: 'flex-end',
                    marginRight: '3%',
                  }}>
                  <Text style={{fontSize: 18, color: 'black'}}>
                    <Text style={{fontSize: 12, color: 'grey'}}>CHF</Text>
                    {parseFloat(item.billingamountauthorised / 100).toFixed(2)}
                   
                  </Text>
                  <View style= {{flex :6, flexDirection:"row", justifyContent:"flex-end"}}>
                    <Icon name="arrow-dropright" color="#5AA8C8" />
                    </View>
                </View>
              </View>
            </View>
          )}
          keyExtractor={item => item.uniqueref}
          //containerStyle={{borderBottomWidth: 0}}
        />
      </View>
    );
  }
}

export default TransactionsComponent;

这是 JSON 的示例，addedtime 是交易创建的纪元日期

[   
    {
    "billingamountauthorised": "1",
    "iconblob": "https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/cb/cf/bb/cbcfbb61-4d03-4f4e-ecf7-b7582688435f/source/512x512bb.jpg",
    "merchantname": "K Kiosk Sihlquai",
    "merchantstreet": "Sihlquai",
    "addedtime": 1576590342000,
    "uniqueref": "A446806878486B5B"
},
{
    "billingamountauthorised": "750",
    "iconblob": "https://upload.wikimedia.org/wikipedia/en/thumb/d/d3/Starbucks_Corporation_Logo_2011.svg/1024px-Starbucks_Corporation_Logo_2011.svg.png",
    "merchantname": "Starbucks",
    "merchantstreet": "Rue du Mont-Blanc",
    "addedtime": 1576590342000,
    "uniqueref": "D0868EB65DC2DE585"
},
    {
        "billingamountauthorised": "1",
        "iconblob": "https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/cb/cf/bb/cbcfbb61-4d03-4f4e-ecf7-b7582688435f/source/512x512bb.jpg",
        "merchantname": "K Kiosk Sihlquai",
        "merchantstreet": "Sihlquai",
        "addedtime": 1576590342000,
        "uniqueref": "A446806878486B5B0"
    },
    {
        "billingamountauthorised": "100",
        "iconblob": "https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/cb/cf/bb/cbcfbb61-4d03-4f4e-ecf7-b7582688435f/source/512x512bb.jpg",
        "merchantname": "K Kiosk Sihlquai",
        "merchantstreet": "Sihlquai",
        "addedtime": 1575554709000,
        "uniqueref": "0D10B5F56A73D73DD"
        
    },
    {
        "billingamountauthorised": "1320",
        "iconblob": "https://pbs.twimg.com/profile_images/568401882444349441/KDWvUHCJ_400x400.jpeg",
        "merchantname": "Schweizerische Bundesbahnen",
        "merchantstreet": "Bahnhofplatz",
        "addedtime": 1575554709000,
        "uniqueref": "2F3D907B0FF675216"
    }
  ]

这是目前交易的样子，每笔交易旁边都显示日期，无论日期是否与另一笔交易相同。

Answer 1

如果您打算使用 SectionList，则需要根据日期对项目进行分组。为了做到这一点，您可以在 JavaScript.

中使用 reduce 方法

const JSON_DATA = [
  {
    "billingamountauthorised": "1",
    "iconblob": "https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/cb/cf/bb/cbcfbb61-4d03-4f4e-ecf7-b7582688435f/source/512x512bb.jpg",
    "merchantname": "K Kiosk Sihlquai",
    "merchantstreet": "Sihlquai",
    "addedtime": 1576590342000,
    "uniqueref": "A446806878486B5B"
  },
  {
    "billingamountauthorised": "750",
    "iconblob": "https://upload.wikimedia.org/wikipedia/en/thumb/d/d3/Starbucks_Corporation_Logo_2011.svg/1024px-Starbucks_Corporation_Logo_2011.svg.png",
    "merchantname": "Starbucks",
    "merchantstreet": "Rue du Mont-Blanc",
    "addedtime": 1576590342000,
    "uniqueref": "D0868EB65DC2DE585"
  },
  {
    "billingamountauthorised": "1",
    "iconblob": "https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/cb/cf/bb/cbcfbb61-4d03-4f4e-ecf7-b7582688435f/source/512x512bb.jpg",
    "merchantname": "K Kiosk Sihlquai",
    "merchantstreet": "Sihlquai",
    "addedtime": 1576590342000,
    "uniqueref": "A446806878486B5B0"
  },
  {
    "billingamountauthorised": "100",
    "iconblob": "https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/cb/cf/bb/cbcfbb61-4d03-4f4e-ecf7-b7582688435f/source/512x512bb.jpg",
    "merchantname": "K Kiosk Sihlquai",
    "merchantstreet": "Sihlquai",
    "addedtime": 1575554709000,
    "uniqueref": "0D10B5F56A73D73DD"

  },
  {
    "billingamountauthorised": "1320",
    "iconblob": "https://pbs.twimg.com/profile_images/568401882444349441/KDWvUHCJ_400x400.jpeg",
    "merchantname": "Schweizerische Bundesbahnen",
    "merchantstreet": "Bahnhofplatz",
    "addedtime": 1575554709000,
    "uniqueref": "2F3D907B0FF675216"
  }
]

let data = Object.values(JSON_DATA.reduce((acc, item) => {
  if (!acc[item.addedtime]) acc[item.addedtime] = {
    title: item.addedtime,
    data: []
  };
  acc[item.addedtime].data.push(item);
  return acc;
}, {}))

现在您可以像下面的演示那样使用 React-Native SectionList。

import React, { Component } from 'react';
import { StyleSheet, Text, View, SectionList, Image } from 'react-native';

const JSON_DATA = [
  {
    "billingamountauthorised": "1",
    "iconblob": "https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/cb/cf/bb/cbcfbb61-4d03-4f4e-ecf7-b7582688435f/source/512x512bb.jpg",
    "merchantname": "K Kiosk Sihlquai",
    "merchantstreet": "Sihlquai",
    "addedtime": 1576590342000,
    "uniqueref": "A446806878486B5B"
  },
  {
    "billingamountauthorised": "750",
    "iconblob": "https://upload.wikimedia.org/wikipedia/en/thumb/d/d3/Starbucks_Corporation_Logo_2011.svg/1024px-Starbucks_Corporation_Logo_2011.svg.png",
    "merchantname": "Starbucks",
    "merchantstreet": "Rue du Mont-Blanc",
    "addedtime": 1576590342000,
    "uniqueref": "D0868EB65DC2DE585"
  },
  {
    "billingamountauthorised": "1",
    "iconblob": "https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/cb/cf/bb/cbcfbb61-4d03-4f4e-ecf7-b7582688435f/source/512x512bb.jpg",
    "merchantname": "K Kiosk Sihlquai",
    "merchantstreet": "Sihlquai",
    "addedtime": 1576590342000,
    "uniqueref": "A446806878486B5B0"
  },
  {
    "billingamountauthorised": "100",
    "iconblob": "https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/cb/cf/bb/cbcfbb61-4d03-4f4e-ecf7-b7582688435f/source/512x512bb.jpg",
    "merchantname": "K Kiosk Sihlquai",
    "merchantstreet": "Sihlquai",
    "addedtime": 1575554709000,
    "uniqueref": "0D10B5F56A73D73DD"

  },
  {
    "billingamountauthorised": "1320",
    "iconblob": "https://pbs.twimg.com/profile_images/568401882444349441/KDWvUHCJ_400x400.jpeg",
    "merchantname": "Schweizerische Bundesbahnen",
    "merchantstreet": "Bahnhofplatz",
    "addedtime": 1575554709000,
    "uniqueref": "2F3D907B0FF675216"
  }
]

const DATA = Object.values(JSON_DATA.reduce((acc, item) => {

  if (!acc[item.addedtime]) acc[item.addedtime] = {
    title: item.addedtime,
    data: []
  };
  acc[item.addedtime].data.push(item);
  return acc;

}, {}))


export default class App extends Component {

  renderItems = ({ item }) => {
    return (
      <View style={styles.itemStyle}>
        <Image
          style={{ width: 60, height: 60 }}
          source={{ uri: item.iconblob }}
        />
        <Text>{item.merchantname}</Text>
        <Text>{item.merchantstreet}</Text>
      </View>
    )
  }

  renderHeader = ({ section }) => {
    return (
      <View style={styles.headerStyle}>
        <Text>{section.title}</Text>
      </View>
    )
  }

  render() {
    return (
      <SectionList
        sections={DATA}
        keyExtractor={(item, index) => item + index}
        renderItem={this.renderItems}
        renderSectionHeader={this.renderHeader}
      />
    );
  }

}

const styles = StyleSheet.create({
  itemStyle: {
    backgroundColor: '#dcdee0',
    padding: 10,
    margin: 5,
  },
  headerStyle: {
    paddingLeft: 10,
    paddingVertical: 10,
  },
});

希望对您有所帮助。尝试根据您的要求修改代码。

您如何按交易在本机中创建的日期对交易列表进行分组？

How do you group a list of transactions by the date they're created in react native?

javascript

react-native

mobile-application

react-native-flatlist

react-native-sectionlist