sheetjs/demos/angular2/ionic.ts

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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
/* vim: set ts=2: */
import { Component } from '@angular/core';
import * as XLSX from 'xlsx';
import { File } from '@ionic-native/file';
type AOA = any[][];
@Component({
selector: 'page-home',
template: `
<ion-header><ion-navbar><ion-title>SheetJS Ionic Demo</ion-title></ion-navbar></ion-header>
<ion-content padding>
<ion-grid>
<ion-row *ngFor="let row of data">
<ion-col *ngFor="let val of row">
{{val}}
</ion-col>
</ion-row>
</ion-grid>
</ion-content>
<ion-footer>
<input type="file" (change)="onFileChange($event)" multiple="false" />
<button ion-button color="secondary" (click)="import()">Import Data</button>
<button ion-button color="secondary" (click)="export()">Export Data</button>
</ion-footer>
`
})
export class HomePage {
data: any[][] = [[1,2,3],[4,5,6]];
constructor(public file: File) {};
read(bstr: string) {
/* read workbook */
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}));
};
write(): XLSX.WorkBook {
/* 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, 'SheetJS');
return wb;
};
/* File Input element for browser */
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) => {
const bstr: string = e.target.result;
this.read(bstr);
};
reader.readAsBinaryString(target.files[0]);
};
/* Import button for mobile */
async import() {
try {
const target: string = this.file.documentsDirectory || this.file.externalDataDirectory || this.file.dataDirectory || '';
const dentry = await this.file.resolveDirectoryUrl(target);
const url: string = dentry.nativeURL || '';
alert(`Attempting to read SheetJSIonic.xlsx from ${url}`)
const bstr: string = await this.file.readAsBinaryString(url, "SheetJSIonic.xlsx");
this.read(bstr);
} catch(e) {
const m: string = e.message;
alert(m.match(/It was determined/) ? "Use File Input control" : `Error: ${m}`);
}
};
/* Export button */
async export() {
const wb: XLSX.WorkBook = this.write();
const filename: string = "SheetJSIonic.xlsx";
try {
/* generate Blob */
const wbout: ArrayBuffer = XLSX.write(wb, { bookType: 'xlsx', type: 'array' });
const blob: Blob = new Blob([wbout], {type: 'application/octet-stream'});
/* find appropriate path for mobile */
const target: string = this.file.documentsDirectory || this.file.externalDataDirectory || this.file.dataDirectory || '';
const dentry = await this.file.resolveDirectoryUrl(target);
const url: string = dentry.nativeURL || '';
/* attempt to save blob to file */
await this.file.writeFile(url, filename, blob, {replace: true});
alert(`Wrote to SheetJSIonic.xlsx in ${url}`);
} catch(e) {
if(e.message.match(/It was determined/)) {
/* in the browser, use writeFile */
XLSX.writeFile(wb, filename);
}
else alert(`Error: ${e.message}`);
}
};
}