我有以下csv文件,该文件的名称data.csv与js控制器位于同一文件夹中:
data.csv
namn,vecka,måndag,tisdag,onsdag,torsdag,fredag,lördag,söndag Row01,a,a1,a2,a3,a4,a5,a6,a7 Row02,b,b1,b2,b3,b4,b5,b6,b7 Row03,c,c1,c2,c3,c4,c5,c6,c7 Row04,d,d1,d2,d3,d4,d5,d6,d7 Row05,e,e1,e2,e3,e4,e5,e6,e7 Row06,f,f1,f2,f3,f4,f5,f6,f7 Row07,g,g1,g2,g3,g4,g5,g6,g7 Row08,h,h1,h2,h3,h4,h5,h6,h7 Row09,i,i1,i2,i3,i4,i5,i6,i7 Row10,j,j1,j2,j3,j4,j5,j6,j7 Row11,k,k1,k2,k3,k4,k5,k6,k7 Row12,l,l1,l2,l3,l4,l5,l6,l7
作为响应,我需要导入一个csv文件并将其解析为JSON。我尝试了以下方法:
componentWillMount() { this.getCsvData(); } getData(result) { console.log(result); } getCsvData() { let csvData = require('./data.csv'); Papa.parse(csvData, { complete: this.getData }); }
由于某些原因,这不起作用。显示第一个console.log /static/media/data.0232d748.csv,第二个显示以下内容:
/static/media/data.0232d748.csv
{ "data": [ [ "/static/media/horoscope-data.0232d748.csv" ] ], "errors": [ { "type": "Delimiter", "code": "UndetectableDelimiter", "message": "Unable to auto-detect delimiting character; defaulted to ','" } ], "meta": { "delimiter": ",", "linebreak": "\n", "aborted": false, "truncated": false, "cursor": 41 } }
我不明白我在做什么错。有人能帮我吗?
为了回答我自己的问题,我可以像这样重写它(/src/controllers/data-controller/data- controller.js,添加了完整的代码以提高清晰度):
/src/controllers/data-controller/data- controller.js
import React from 'react'; import Papa from 'papaparse'; import {withRouter} from 'react-router-dom'; class DataController extends React.Component { constructor(props) { super(props); this.state = { data: [] }; this.getData = this.getData.bind(this); } componentWillMount() { this.getCsvData(); } fetchCsv() { return fetch('/data/data.csv').then(function (response) { let reader = response.body.getReader(); let decoder = new TextDecoder('utf-8'); return reader.read().then(function (result) { return decoder.decode(result.value); }); }); } getData(result) { this.setState({data: result.data}); } async getCsvData() { let csvData = await this.fetchCsv(); Papa.parse(csvData, { complete: this.getData }); } render() { return ( <section className="data-controller"> ... </section> ); } } export default withRouter(DataController);
在这里,我使用内置提取功能像流一样获取它,然后使用内置流读取器读取流,并使用解码数据TextDecoder。我也不得不移动文件。在它进入之前,/src/controllers/data- controller我不得不将其移动到/public/data。
TextDecoder
/src/controllers/data- controller
/public/data