React:导入CSV文件并解析 [英] React: import csv file and parse
问题描述
我有以下名为data.csv
的csv文件,它与我的js控制器位于同一文件夹中:
I have the following csv file that is named data.csv
and located in the same folder as my js controller:
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
在反应中,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:
In react, I need to import a csv file and parse it to JSON. I tried the following:
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.第一个console.log显示/static/media/data.0232d748.csv
,第二个显示以下内容:
This doesnt work for some reason. The first console.log displays /static/media/data.0232d748.csv
and the second displays the following:
{
"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.有人可以帮我吗?
I don't understand what I am doing wrong. Can someone help me?
推荐答案
要回答我自己的问题,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):
To answer my own question, I was able to rewrite it like this (/src/controllers/data-controller/data-controller.js
, added the full code for better clarity):
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,我使用内置的获取功能像流一样获取它,然后使用内置的流读取器读取流,并使用TextDecoder
解码数据.我也不得不移动文件.在将其放置在/public/data
.
Here I use the built in fetch to get it like a stream and then read the stream using the build in stream reader, and decode the data using TextDecoder
. I had to move the file also. Before it was located in /src/controllers/data-controller
but I had to move it to /public/data
.
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