是否可以读取excel工作表并在前端显示其内容?
我在想,我是否可以使用XLSX读取excel工作表的内容,并在前端显示其内容 我试着使用是否可以读取excel工作表并在前端显示其内容?,excel,angular,typescript,Excel,Angular,Typescript,我在想,我是否可以使用XLSX读取excel工作表的内容,并在前端显示其内容 我试着使用 tmpArray= []; reader.onload = function(e : any) { var data = new Uint8Array(e.target.result); var workbook = XLSX.read(data, {type: 'array'}); let worksheet = workbook.Sheets[workbook.SheetNames[
tmpArray= [];
reader.onload = function(e : any) {
var data = new Uint8Array(e.target.result);
var workbook = XLSX.read(data, {type: 'array'});
let worksheet = workbook.Sheets[workbook.SheetNames[0]];
// sample values //
let desired_cell = worksheet['B5'];
let cellB16 = worksheet['B16'];
// sample values //
let desired_value12 = (cellB16 ? cellB16.v : undefined);
tmpArray.push[desired_value12];
};
but outside this onload function, array of tmpArray don't exist anymore.
So what i wanted is to access the tmpArray and it's contents after the onload function. Is there any work around to do this?
试试这个
在您的打字脚本文件中
import * as XLSX from 'xlsx';
onFileChange(evt: any) {
/* wire up file reader */
const target: DataTransfer = <DataTransfer>(evt.target);
if (target.files.length !== 1) throw new Error('Cannot use multiple files');
const reader: FileReader = new FileReader();
reader.onload = (e: any) => {
/* read workbook */
const bstr: string = e.target.result;
const wb: XLSX.WorkBook = XLSX.read(bstr, { type: 'binary' });
/* grab first sheet */
const wsname: string = wb.SheetNames[0];
const ws: XLSX.WorkSheet = wb.Sheets[wsname];
/* save data */
this.data = <AOA>(XLSX.utils.sheet_to_json(ws, { header: 1 }));
console.log(this.data);
};
reader.readAsBinaryString(target.files[0]);
}
export(): void {
/* generate worksheet */
const ws: XLSX.WorkSheet = XLSX.utils.aoa_to_sheet(this.data);
/* generate workbook and add the worksheet */
const wb: XLSX.WorkBook = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, 'Sheet1');
/* save to file */
XLSX.writeFile(wb, this.fileName);
}
从“XLSX”导入*为XLSX;
onFileChange(evt:any){
/*连接文件读取器*/
常量目标:数据传输=(evt.target);
如果(target.files.length!==1)抛出新错误(“无法使用多个文件”);
常量读取器:FileReader=newfilereader();
reader.onload=(e:any)=>{
/*阅读工作手册*/
常量bstr:string=e.target.result;
常量wb:XLSX.WorkBook=XLSX.read(bstr,{type:'binary'});
/*抢第一张*/
const wsname:string=wb.SheetNames[0];
const ws:XLSX.WorkSheet=wb.Sheets[wsname];
/*保存数据*/
this.data=(XLSX.utils.sheet_to_json(ws,{header:1}));
console.log(this.data);
};
reader.readAsBinaryString(target.files[0]);
}
导出():无效{
/*生成工作表*/
const ws:XLSX.WorkSheet=XLSX.utils.aoa_to_sheet(this.data);
/*生成工作簿并添加工作表*/
const wb:XLSX.WorkBook=XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb,ws,“Sheet1”);
/*保存到文件*/
XLSX.writeFile(wb,this.fileName);
}
尝试此操作-读取excel文件
从“XLSX”导入*作为XLSX
请进行以下更改,您将能够从任何位置访问
tmpArray
的值
tmpArray; // changed here and moved it to outside the function
let self = this; // please note this change
reader.onload = function(e : any) {
var data = new Uint8Array(e.target.result);
var workbook = XLSX.read(data, {type: 'array'});
let worksheet = workbook.Sheets[workbook.SheetNames[0]];
// sample values //
let desired_cell = worksheet['B5'];
let cellB16 = worksheet['B16'];
// sample values //
let desired_value12 = (cellB16 ? cellB16.v : undefined);
self.tmpArray = desired_value12; // changed here
};
只是
this
关键字的计算结果是当前执行上下文的ThisBinding的值。因此,您必须有一个简单的变通方法来访问该值之外的值function@Opkko林:你试过这个吗?我好像不能像这样把它绑起来。我写的只是一个抽象版本。它说组件中不存在tmpArray。@OpkkoLim更新了答案,请将tmpArray
移动到组件类中函数定义之外的顶部(就像任何普通变量声明一样)。嗨@Joel Joseph,我也得出了相同的结论,但是,当我将值推入tmpArray时,它说里面的值是未定义的。导致一些问题。我必须将值转换为json吗?必须这样做。我不能将工作表保存到新文件中吗?我只想在onload期间显示值{header:1}实际上做什么?对不起,我不明白XLS@dasunse的自述文件或index.d.ts
tmpArray; // changed here and moved it to outside the function
let self = this; // please note this change
reader.onload = function(e : any) {
var data = new Uint8Array(e.target.result);
var workbook = XLSX.read(data, {type: 'array'});
let worksheet = workbook.Sheets[workbook.SheetNames[0]];
// sample values //
let desired_cell = worksheet['B5'];
let cellB16 = worksheet['B16'];
// sample values //
let desired_value12 = (cellB16 ? cellB16.v : undefined);
self.tmpArray = desired_value12; // changed here
};