xsheetjs/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.

Other scripts in this demo show:

• ionic deployment for iOS, android, and browser

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: 'array' });
saveAs(new Blob([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 package.json-angular# files for Angular 2, Angular 4, and Angular 5

To test a particular Angular version, overwrite package.json:

# switch to Angular 2
$ cp package.json-angular2 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': ''  // <--|
  }
});

Ionic

Reproducing the full project is a little bit tricky. The included ionic.sh script performs the necessary installation steps.

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

<ion-grid>
  <ion-row *ngFor="let row of data">
    <ion-col *ngFor="let val of row">
      {{val}}
    </ion-col>
  </ion-row>
</ion-grid>

@ionic-native/file reads and writes files on devices. readAsBinaryString returns strings that can be parsed with the binary type, and array type can easily be converted to blobs that can be exported with writeFile:

/* read a workbook */
const bstr: string = await this.file.readAsBinaryString(url, filename);
const wb: XLSX.WorkBook = XLSX.read(bstr, {type: 'binary'});

/* write a workbook */
const wbout: ArrayBuffer = XLSX.write(wb, { bookType: 'xlsx', type: 'array' });
let blob = new Blob([wbout], {type: 'application/octet-stream'});
this.file.writeFile(url, filename, blob, {replace: true});