Material-UI表格中如何显示动态数据？

Question

我有返回一些表格数据的 API。我需要在表格中显示这些数据。我不清楚如何实现这个目标。假设我想显示字段id并name存储在groups. 如何在 Material-UI 表中显示它们？请在下面查看我当前的代码。它不会抛出任何错误。但两者都没有显示包含数据的表格。import '../../App.css';import React, { useEffect } from 'react'import { makeStyles } from '@material-ui/core/styles';import Grid from '@material-ui/core/Grid';import Table from '@material-ui/core/Table';import TableBody from '@material-ui/core/TableBody';import TableCell from '@material-ui/core/TableCell';import TableContainer from '@material-ui/core/TableContainer';import TableHead from '@material-ui/core/TableHead';import TableRow from '@material-ui/core/TableRow';import Paper from '@material-ui/core/Paper';import axios from 'axios'import config from '../../config/config.json';const useStyles = makeStyles((theme) => ({    root: {        width: '100%',    },    heading: {        fontSize: theme.typography.pxToRem(18),        fontWeight: theme.typography.fontWeightBold,    },    content: {        fontSize: theme.typography.pxToRem(14),        fontWeight: theme.typography.fontWeightRegular,        textAlign: "left",        marginTop: theme.spacing.unit*3,        marginLeft: theme.spacing.unit*3,        marginRight: theme.spacing.unit*3    },    table: {        minWidth: 650,    },    tableheader: {        fontWeight: theme.typography.fontWeightBold,        color: "#ffffff",        background: "#3f51b5"    },    tableCell: {        background: "#f50057"    },    button: {        fontSize: "12px",        minWidth: 100    },}));export function Main() {    const [groups, setGroup] = React.useState('');    const classes = useStyles();    const options = {        'headers': {            'Authorization': `Bearer ${localStorage.getItem('accessToken')}`        }    }

Answer 1

我认为问题是你使用this.setState而不是setGroup

useEffect(() => {

    axios.get(config.api.url + '/api/test', options)

        .then( (groups) => {

            setGroup(groups)

        })

        .catch( (error) => {

            console.log(error);

        })

}, [])

改变你的地图功能

{Object.keys(groups).map( (row, index) => (

  <TableRow key={index} selected="false">

    <TableCell>{row._id}</TableCell>

    <TableCell>{row.user_id}</TableCell>

  </TableRow>))}

import '../../App.css';

import React, { useEffect } from 'react'

import { makeStyles } from '@material-ui/core/styles';

import Grid from '@material-ui/core/Grid';

import Table from '@material-ui/core/Table';

import TableBody from '@material-ui/core/TableBody';

import TableCell from '@material-ui/core/TableCell';

import TableContainer from '@material-ui/core/TableContainer';

import TableHead from '@material-ui/core/TableHead';

import TableRow from '@material-ui/core/TableRow';

import Paper from '@material-ui/core/Paper';

import axios from 'axios'

import config from '../../config/config.json';

const useStyles = makeStyles((theme) => ({

    root: {

        width: '100%',

    },

    heading: {

        fontSize: theme.typography.pxToRem(18),

        fontWeight: theme.typography.fontWeightBold,

    },

    content: {

        fontSize: theme.typography.pxToRem(14),

        fontWeight: theme.typography.fontWeightRegular,

        textAlign: "left",

        marginTop: theme.spacing.unit*3,

        marginLeft: theme.spacing.unit*3,

        marginRight: theme.spacing.unit*3

    },

    table: {

        minWidth: 650,

    },

    tableheader: {

        fontWeight: theme.typography.fontWeightBold,

        color: "#ffffff",

        background: "#3f51b5"

    },

    tableCell: {

        background: "#f50057"

    },

    button: {

        fontSize: "12px",

        minWidth: 100

    },

}));

export function Main() {

    const [groups, setGroup] = React.useState([]);

    const classes = useStyles();

    const options = {

        'headers': {

            'Authorization': `Bearer ${localStorage.getItem('accessToken')}`

        }

    }

useEffect(() => {

        axios.get(config.api.url + '/api/test', options)

            .then( (groups) => {

                setGroup(groups.data.subtask)

                console.log(groups.data.subtask);

            })

            .catch( (error) => {

                console.log(error);

            })

    }, [])

return (

    <div className={classes.root}>

        <Grid container spacing={3}>

            <Grid item xs={12} className={classes.content}>

                <TableContainer component={Paper}>

                    <Table id="split_table" size="small">

                        <TableHead>

                        </TableHead>

                        <TableBody>

                                {Object.keys(groups).map( (item, index) => (

                                <TableRow key={index} selected="false">

                                    <TableCell>{item.user_id}</TableCell>

                                    <TableCell>{item.task_name}</TableCell>

                                </TableRow>))}

                        </TableBody>

                    </Table>

                </TableContainer>

            </Grid>    

        </Grid>

    </div>

)

Answer 2

我认为这是Object.keys(groups).

它不是 React 状态，所以它不会重新渲染？

您能否尝试创建一个 groupKey 状态，然后在组更新时使用 Effect 更新状态。

const [groupKey,setGroupKey] = useState([]);

useEffect(() => {

  setGroupKey(Object.keys(groups));

},[groups]);

在组件中，使用

{groupKey.map((item, index) => (

  <TableRow key={index} selected="false">

    <TableCell>{item.user_id}</TableCell>

    <TableCell>{item.task_name}</TableCell>

  </TableRow>))

}

你明白了。

Answer 3

像下面这样的东西应该有所帮助：