Angular 7读取Excel文件的第一列并将其保存到数组中 [英] Angular 7 reading the first column of an excel file and save it into an array
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问题描述
我正在尝试上传一个Excel文件,其中第一列是ID列.
I am trying to upload an excel file, where the first column is an ID column.
我需要获取所有ID并将其保存到数组中,以便以后将其用于数据管理.
I need to take all the IDs and save them into an array to use them later for data management.
我正在使用XLSX
库:
import {read, write, utils} from 'xlsx';
对于html:
<input type="file" value="Upload Excel/CSV file" (change)="upload($event)" accept=".xlsx, .xls, .csv"/>
<button mat-fab color="warn" (click)="read()"><mat-icon color="warn">attach_file</mat-icon>Read Data</button>
我从开始:
read()
{
const file = new FileReader();
}
但是我无法告诉文件阅读器读取上传的文件.
But I am not able to tell the file reader to read the uploaded file.
编辑
我尝试使用文件输入的change事件:
I tried to use the change event of the file input:
upload(e)
{
let input = e.target;
for (var index = 0; index < input.files.length; index++) {
let reader = new FileReader();
reader.onload = () => {
// this 'text' is the content of the file
var text = reader.result;
console.log(reader.result)
}
reader.readAsText(input.files[index]);
};
}
但是读取结果就像加密一样.
But the read result is like an encryption.
推荐答案
此答案适用于.csv文件:
This answer will work for .csv files :
<input id="file" type="file" accept=".csv" (change)="fileUpload($event.target.files)">
fileUpload(files) {
if (files && files.length > 0) {
const file: File = files.item(0);
const reader: FileReader = new FileReader();
reader.readAsText(file);
reader.onload = (e) => {
const res = reader.result as string; // This variable contains your file as text
const lines = res.split('\n'); // Splits you file into lines
const ids = [];
lines.forEach((line) => {
ids.push(line.split(',')[0]); // Get first item of line
});
console.log(ids);
};
}
}
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