xsheetjs/demos/angular2/nscript.ts

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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
/* vim: set ts=2: */
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import { Component } from '@angular/core';
import { encoding } from '@nativescript/core/text';
import { File, Folder, knownFolders, path } from '@nativescript/core/file-system';
import { Dialogs } from '@nativescript/core';
import { Page, GridLayout, WebView, DockLayout, Button } from '@nativescript/core';
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import * as XLSX from './xlsx.full.min';
@Component({
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selector: 'ns-app',
template: `
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<Page>
<GridLayout rows="auto, *, auto">
<!-- data converted to HTML and rendered in web view -->
<WebView row="1" src="{{html}}"></WebView>
<DockLayout row="2" dock="bottom" stretchLastChild="false">
<Button text="Import File" (tap)="import()" style="padding: 10px"></Button>
<Button text="Export File" (tap)="export()" style="padding: 10px"></Button>
</DockLayout>
</GridLayout>
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</Page>
`
})
export class AppComponent {
html: string = "";
constructor() {
const ws = XLSX.utils.aoa_to_sheet([[1,2],[3,4]]);
this.html = XLSX.utils.sheet_to_html(ws);
};
/* Import button */
async import() {
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const filename: string = "SheetJSNS.csv";
/* find appropriate path */
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const target: Folder = knownFolders.documents() || knownFolders.ios.sharedPublic();
const url: string = path.normalize(target.path + "///" + filename);
const file: File = File.fromPath(url);
try {
/* get binary string */
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const bstr: string = await file.readText(encoding.ISO_8859_1);
/* read workbook */
const wb = XLSX.read(bstr, { type: "binary" });
/* grab first sheet */
const wsname: string = wb.SheetNames[0];
const ws = wb.Sheets[wsname];
/* update table */
this.html = XLSX.utils.sheet_to_html(ws);
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Dialogs.alert(`Attempting to read to ${filename} in ${url}`);
} catch(e) {
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Dialogs.alert(e.message);
}
};
/* Export button */
async export() {
const wb = XLSX.read(this.html, { type: "string" });
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const filename: string = "SheetJSNS.csv";
/* generate binary string */
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const wbout: string = XLSX.write(wb, { bookType: 'csv', type: 'binary' });
/* find appropriate path */
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const target: Folder = knownFolders.documents() || knownFolders.ios.sharedPublic();
const url: string = path.normalize(target.path + "///" + filename);
const file: File = File.fromPath(url);
/* attempt to save binary string to file */
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await file.writeText(wbout, encoding.ISO_8859_1);
Dialogs.alert(`Wrote to ${filename} in ${url}`);
};
}