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firebase - 如何在表格中正确对齐显示来自 firebase 的数据。？使用 React Native。？

问题描述

我正在尝试通过对齐的 map 函数在表中显示对象名称和键。但只有对象数据名称对齐显示，对象键值不对齐显示。我需要帮助。！

应用程序.js

import React, { Component } from 'react';
import { Text, View, ImageBackground, StyleSheet, ScrollView } from 'react-native';
import CustomHeader from '../CustomHeader';
import firebase from '../../database/firebase';

import { DataTable } from 'react-native-paper';

var categories = [];
var categories1 = [];
var data;
// var key;
// var data;
var count = 0;

export default class Bus_Schedule extends Component {
    constructor(props) {
        super(props);
        this.state = {
            dataArray: {},
            arrayList: [],
            menu1:[],
            menu2: [],
          };

    }
    componentDidMount() {
        // firebase.database().ref('Schedule/Route-01/').on('value', querySnapShot => {
        //    data = querySnapShot.val() ? querySnapShot.val() : {};

        //    console.log("Data submit")
        //   let todoItems = {...data};
        //   console.log(todoItems);
        //   this.setState({
        //     dataArray: todoItems,
        //   });
        // });



        ///

        // var data1 = [];
        // console.log("letter send");
        // firebase.database().ref('Schedule/Route-01/').once("value").then(snapshot => {
        //   var data1 = Object.keys(snapshot.val());
        //   console.log(data1);
          
        // })
        
        

        firebase.database().ref('Scheduleinfo/-Md0XP_If-zG3F3qnNmv/').once('value').then(function(snapshot) {

          console.log("        Again");

          // this.setState({
          //   menu1: snapshot.val()
          // })

          // const categories = []
          // var categories1 = []

          snapshot.forEach(function(snap) {
             const item = snap.val();
             categories.push({ key: snap.key, data: snap.val() });

            const item1 = snap.key;
              categories1.push(item1);
              count++;

            
              // Array1 = item;
              // console.log(Array1);
              // let item1 = snap.key ? snap.key : {};
              // Array2 = item1;
              
             
                 
          });
          console.log(count);

          /// For object Values
        //   console.log("Values");
        //  console.log(categories);
        //   this.setState( {    //PASSING VARIABLE TO STATE
        //     menu1 :categories
        // })
        // console.log(this.state.menu1);
         /// For object Names
         console.log("Names");
        console.log(categories1);
          this.setState( {    //PASSING VARIABLE TO STATE
            menu2 :categories1
        })
        console.log(this.state.menu2);


      //  if (categories1 === "123")
      //  {
      //    console.log("SRK");
      //  } 
      //  else{
      //   console.log("No data");

      //  }

      //   categories1.map(x => {
      //   if (x === '123' || x === '456'){
      //    console.log(x);
      //   }else{
      //     console.log("nothing");
      //   }
      // })



      /// Use this method to login user ///
     /// With State Array ///
     
     const name = "AlFateh";
      for(let i =0 ; i< count; i++)
      {
        if(this.state.menu2[i] == name)
        {
          console.log(name);
        }
        // console.log('nothing');
      }
    


       
        
          
         
     }.bind(this));

      }


      empty()
      {
        categories1 = [];
        categories = [];

      }
      
    render() {
        let todosKeys = Object.keys(this.state.dataArray);
        
        return (
            <View
            style={styles.container}>
            <CustomHeader title="Bus Schedule" navigation={this.props.navigation} />

            <DataTable style={{ top: -12 }}>
              <DataTable.Header style={{ backgroundColor: '#F7EA6D' }}>
                <DataTable.Title style={{ justifyContent: 'center', alignItems: 'center' }}><Text style={{ fontSize: 20, fontWeight: "bold" }}>Route-1</Text></DataTable.Title>
              </DataTable.Header>

              <DataTable.Header style={{ backgroundColor: '#F7EA6D' }}>
              <DataTable.Title style={{ marginLeft:35 }}><Text style={{ fontSize: 20, fontWeight: "bold" }}>PLACE                DEPT.TIME</Text></DataTable.Title>
            </DataTable.Header>
              

              {
                categories.map(({ key, data }, key1) => (
                  <View style={{ backgroundColor: "#D1FDFF",}} key={key1} id={key1}>
                    <DataTable.Row>
                      <DataTable.Cell style={{ marginLeft: 50, }}>
                        <Text style={{ fontSize: 15, fontWeight: "bold" }} key={key1} id={key1}>
                          {key}
                        </Text>
                                    
                        <View
                          style={{
                          
                            alignItems:'center',
                            justifyContent:'center',
                            alignSelf:'center',
                            flexDirection:'column',
                            
                          }}
                          key={`key_1`}
                          id={`key_1`}
                        >
                          <Text key={`key_2`} id={`key_2`} style={{paddingLeft: 34, marginLeft: 100, textAlign: 'center', fontSize: 15, fontWeight: "bold"}}>
                            {data}
                          </Text>
                        </View>
                      </DataTable.Cell>
                    </DataTable.Row>
                  </View>
                ))
              }

            </DataTable>

           
          
            
            {this.empty()}
          </View>

        );

    }
}



const styles = StyleSheet.create({
    container: {
        backgroundColor: '#FEF9E7',
        flex: 1,
        
    },

    appButtonText: {
        fontSize: 15,
        color: "#fff",
        fontWeight: "bold",
        alignSelf: "center",
        textTransform: "uppercase"
    }

});

我正在尝试通过对齐的 map 函数在表中显示对象名称和键。但只有对象数据名称对齐显示，对象键值不对齐显示。我需要帮助。！

对象键值未对齐的输出

标签： firebasereact-nativefirebase-realtime-databasereact-hooksstyles

解决方案

您应该将密钥和数据分开DataTable.Cell

<DataTable.Row>
  <DataTable.Cell>{key}</DataTable.Cell>
  <DataTable.Cell>{data}</DataTable.Cell>
</DataTable.Row>

对标题做同样的事情

<DataTable.Header>
  <DataTable.Title>PLACE</DataTable.Title>
  <DataTable.Title>DEPT.TIME</DataTable.Title>
</DataTable.Header>

并在这些组件中修改您的样式

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