[英]trying to populate datatable with data in json format but getting no data available error
[英]Getting element type is invalid error when trying to populate cards with JSON data
我知道這個錯誤已經發布了很多次,但沒有一個修復對我有用。 我已經堅持了一個星期了......
我在業余時間學習反應,我想制作一個網頁,它接受一個 json 對象,遍歷它來填充卡片,然后返回卡片。 這是在我導入到主頁的組件中制作的。 這是錯誤:
未捕獲的錯誤:元素類型無效:應為字符串(對於內置組件)或類/函數(對於復合組件)但得到:未定義。 您可能忘記從定義組件的文件中導出組件,或者您可能混淆了默認導入和命名導入。 檢查Dashboard
的渲染方法。
import React from 'react';
import { CardHeader, Card } from "@material-ui/core";
import render from "react-dom";
export default function CardComponent() {
let bedpressJSONObject = {
bedpress: {
"0": {
bedriftsnavn: "hei",
dato: "24.12.12",
info: "asdasdsadas"
},
"1": {
bedriftsnavn: "på",
dato: "14.05.22",
info: "gfdsgdfsbvfbvsrgf"
},
"2": {
bedriftsnavn: "dei",
dato: "15.2.12",
info: "243wresdfvxzgbtr"
}
}
};
let cardList = [];
Object.keys(bedpressJSONObject.bedpress).forEach(index => {
let card = bedpressJSONObject.bedpress[index];
console.log(card.dato)
cardList.push(
<Card>
<CardHeader
title={card.bedriftsnavn}
subtitle={card.dato}
actAsExpander={true}
showExpandableButton={true}
/>
<p>{card.info}</p>
</Card>
);
});
{
return (
<div className="card-list">
{cardList}
</div>
);
}
}
這是主頁:
import AppBar from "@material-ui/core/AppBar";
import { makeStyles } from "@material-ui/core/styles";
import Toolbar from "@material-ui/core/Toolbar";
import Typography from "@material-ui/core/Typography";
import "bootstrap/dist/css/bootstrap.min.css";
import React from "react";
import {CardComponent} from "../Components/CardsComponent";
import {DropdownMenu} from "../Components/DropdownComponent";
const useStyles = makeStyles(theme => ({
root: {
flexGrow: 1
},
menuButton: {
marginRight: theme.spacing(2)
}
}));
export default function Dashboard() {
const classes = useStyles();
return (
<div className={classes.root}>
<div>
<AppBar position="static" style={{ backgroundColor: "#182b36" }}>
<Toolbar variant="dense">
<DropdownMenu />
<Typography variant="h6" color="inherit">
Dashboard
</Typography>
</Toolbar>
</AppBar>
</div>
<CardComponent/>
</div>
);
}
任何幫助或提示將不勝感激!
而不是import {CardComponent} from "../Components/CardsComponent";
使用import CardComponent from "../Components/CardsComponent";
您在 CardComponent.js 中使用export default
和未命名導出
https://developer.mozilla.org/en-US/docs/web/javascript/reference/statements/export
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