我一直在通过 axios 从我的 MongoDB 服务器导入 JSON 文件。我能够成功获取数据,但无法在图表上显示。我已经看到了其他答案,似乎很容易将每个键列存储在一个单独的变量中,然后加载到labels
对象data
,但是这种更优化并且 Chartjs 也允许我们使用其文档中列出的这种方法,但我可能会在某个地方出错。需要帮助,因为我需要为我的项目实施它
import React, { useState } from 'react';
import axios from 'axios';
import { useEffect } from 'react';
import {Bar, Line} from 'react-chartjs-2';
const URL = process.env.REACT_APP_SERVER_URL || 'http://localhost:5000/';
function ChartRoughPage(props) {
const [historicalData,setHistoricalData] = useState([]);
useEffect(()=>{
axios.get(URL+'stock/BLUEDART')
.then((response)=>{
if(response.status===200){
console.log(response.data)
setHistoricalData(response.data)
}
else{
console.log("ERROR: "+response.status+" , "+response.statusText)
}
})
.catch((err) => console.log.err);
},[]);
return (
<div>
<Line
data={{
datasets:[{
label:'Everyday Chart',
data : historicalData,
parsing:{
xAxisKey:'DATE',
yAxisKey:'CLOSE'
}
}]
}}
/>
</div>
);
}
export default ChartRoughPage;
输出:它只显示一个没有数据的图表
为了更好地理解这里是文档的链接: https ://www.chartjs.org/docs/latest/general/data-structures.html
我还尝试在我的代码上进行以下操作:
- 尝试将其写入选项
...
<Line
data={{
datasets:[{
data : historicalData
}]
}}
options={{
parsing:{
xAxisKey:'Date',
yAxisKey:'Close'
}
}}
/>
...
- 提供静态数据,例如:
historicalData = [{Date : '22-02-2000',Close: 56},{Date : '22-03-2000',Close: 656},{Date : '23-05-2000',Close: 6}]
我从MongoDB作为 JSON 发送的文档也是这样的(所有值都可以通过它们的键访问):
{"_id":{"$oid":"some-object-id"},"Date":"2019-01-03","Symbol":"20MICRONS","Series":"EQ","Prev Close":{"$numberDouble":"44.05"},"Open":{"$numberDouble":"44.05"},"High":{"$numberDouble":"44.1"},"Low":{"$numberDouble":"43.1"},"Last":{"$numberDouble":"43.4"},"Close":{"$numberDouble":"43.45"},"VWAP":{"$numberDouble":"43.48"},"Volume":{"$numberInt":"15741"},"Turnover":{"$numberDouble":"68447485000.0"},"Trades":{"$numberDouble":"368.0"},"Deliverable Volume":{"$numberInt":"9487"},"%Deliverble":{"$numberDouble":"0.6027"}}
将不胜感激您的帮助!