how to use SheetJS (js-xlsx) in angular 2

问题:

I'm learning angular2 and i wanted to use js-xlsx library in my project.

I installed xlsx npm install xlsx and jszip npm install jszip and added them in my index.html

<script src="node_modules/xlsx/dist/xlsx.core.min.js"></script>

<script src="node_modules/jszip/dist/jszip.min.js"></script>

and added the typescript defitions tsd install xlsx

and I'm using webpack

but when I used it in

import * as xlsx from 'xlsx'; 

but i get error module build failed: error: cannot resolve module 'xlsx'

回答1:

An easier method would be not using typings at all:

1. Add xlsx.core.min.js to your index.html file as you did. (I'm using angular-cli so my js files get copied to the dist/vendor directory)

   <script src="vendor/xlsx/dist/xlsx.core.min.js"></script>

2. In your module, do not use import but declare XLSX under your imports block.

   declare var XLSX: any;

If you're using angular-cli, you will need to add xlsx to your angular-cli-build.js file.

module.exports = function(defaults) {   return new Angular2App(defaults, {     vendorNpmFiles: [       'systemjs/dist/system-polyfills.js',       'systemjs/dist/system.src.js',       'zone.js/dist/**/*.+(js|js.map)',       'es6-shim/es6-shim.js',       'reflect-metadata/**/*.+(ts|js|js.map)',       'rxjs/**/*.+(js|js.map)',       '@angular/**/*.+(js|js.map)',       'moment/moment.js',        ....       'xlsx/**/*.+(js|js.map)'     ]}) }; 

回答2:

tryout ts-xlsx, it's simple to use
npm install --save ts-xlsx
then install the typings
npm install --save @types/xlsx

/* You can use as namespace: */ import * as XLSX from 'ts-xlsx'; let wb: XLSX.IWorkBook = XLSX.read(...)  /* Or straight forward import */ import { read, IWorkBook } from 'ts-xlsx'; let wb: IWorkBook = read(...) 

回答3:

The following is a working component who exports an xlsx file from an array of objects using js-xlsx lib on Angular 2/4:

import { Component, OnInit } from '@angular/core';  import { utils, write, WorkBook } from 'xlsx';  import { saveAs } from 'file-saver';  @Component({   selector: 'app-root',   templateUrl: './app.component.html',   styleUrls: ['./app.component.css'] }) export class AppComponent implements OnInit {   title = 'app';   table = [     {       First: 'one',       Second: 'two',       Third: 'three',       Forth: 'four',       Fifth: 'five'     },     {       First: 'un',       Second: 'deux',       Third: 'trois',       Forth: 'quatre',       Fifth: 'cinq'     },   ];    ngOnInit() {     const ws_name = 'SomeSheet';     const wb: WorkBook = { SheetNames: [], Sheets: {} };     const ws: any = utils.json_to_sheet(this.table);     wb.SheetNames.push(ws_name);     wb.Sheets[ws_name] = ws;     const wbout = write(wb, { bookType: 'xlsx', bookSST: true, type:  'binary' });  function s2ab(s) {   const buf = new ArrayBuffer(s.length);   const view = new Uint8Array(buf);   for (let i = 0; i !== s.length; ++i) {     view[i] = s.charCodeAt(i) & 0xFF;   };   return buf; }  saveAs(new Blob([s2ab(wbout)], { type: 'application/octet-stream' }), 'exported.xlsx');   } } 

You have to install xlsx and file-saver for this to work.

For the working example on exporting a xlsx file from an array of jsons on Angular2/4:

https://github.com/bogdancar/xlsx-json-to-xlsx-demo-Angular2

回答4:

Something else you might try is changing the link to use the full version, instead of core. The following worked for me:

<script lang="javascript" src="dist/xlsx.full.min.js"></script> 

This will change with your path. Yours would be:

<script src="node_modules/xlsx/dist/xlsx.full.min.js"></script> 

回答5:

I installed the xlsx package, e.g. "npm install --save xlsx". It updated the package.json file with xlsx as a dependency. And now in my component I can import it, e.g. "import * as XLSX from 'xlsx' ". I'm using Angular 4. I guess, in Angular 2 it should work exactly the same way. P.S. There is no need to include the javascript file in the index.html.

回答6:

For making xlsx work for angular 2+, you don't need any typings to be installed. Because the xlsx library contains the required typings in the package itself.

Step 1: Install xlsx using npm

npm install xlsx 

Step 2: Import xlsx in your service/component.

const XLSX = require('xlsx');

OR  

import * as XLSX from 'xlsx'; -- (This did not work for me)

Step 3: You can use the XLSX as below.

XLSX.utils.json_to_sheet(json); 

文章来源: how to use SheetJS (js-xlsx) in angular 2