sheetjs/demos/angular2/README.md

Angular 2+

The library can be imported directly from TS code with:

import * as XLSX from 'xlsx';

This demo uses an array of arrays (type Array<Array<any>>) as the core state. The component template includes a file input element, a table that updates with the data, and a button to export the data.

Array of Arrays

Array<Array<any>> neatly maps to a table with ngFor:

<table class="sjs-table">
  <tr *ngFor="let row of data">
    <td *ngFor="let val of row">
      {{val}}
    </td>
  </tr>
</table>

The aoa_to_sheet utility function returns a worksheet. Exporting is simple:

/* 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 */
const wbout: string = XLSX.write(wb, { bookType: 'xlsx', type: 'binary' });
saveAs(new Blob([s2ab(wbout)]), 'SheetJS.xlsx');

sheet_to_json with the option header:1 makes importing simple:

/* <input type="file" (change)="onFileChange($event)" multiple="false" /> */
/* ... (within the component class definition) ... */
  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}));
    };
    reader.readAsBinaryString(target.files[0]);
  }

Switching between Angular versions

Modules that work with Angular 2 largely work as-is with Angular 4. Switching between versions is mostly a matter of installing the correct version of the core and associated modules. This demo includes a package.json for Angular 2 and another package.json for Angular 4.

Switching to Angular 2 is as simple as:

$ cp package.json-angular2 package.json
$ npm install
$ ng serve

Switching to Angular 4 is as simple as:

$ cp package.json-angular4 package.json
$ npm install
$ ng serve

XLSX Symbolic Link

In this tree, node_modules/xlsx is a link pointing back to the root. This enables testing the development version of the library. In order to use this demo in other applications, add the xlsx dependency:

$ npm install --save xlsx

SystemJS Configuration

The default angular-cli configuration requires no additional configuration.

Some deployments use the SystemJS loader, which does require configuration. The SystemJS example shows the required meta and map settings:

SystemJS.config({
  meta: {
    'xlsx': {
      exports: 'XLSX' // <-- tell SystemJS to expose the XLSX variable
    }
  },
  map: {
    'xlsx': 'xlsx.full.min.js', // <-- make sure xlsx.full.min.js is in same dir
    'fs': '',     // <--|
    'crypto': '', // <--| suppress native node modules
    'stream': ''  // <--|
  }
});