98 lines
3.6 KiB
JavaScript
98 lines
3.6 KiB
JavaScript
/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
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import XLSX from 'xlsx';
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import React, { Component } from 'react';
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import { AppRegistry, StyleSheet, Text, View, Button, Alert, Image } from 'react-native';
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import { Table, Row, Rows } from 'react-native-table-component';
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// react-native-fs
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import { writeFile, readFile, DocumentDirectoryPath } from 'react-native-fs';
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const DDP = DocumentDirectoryPath + "/";
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const input = res => res;
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const output = str => str;
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// react-native-fetch-blob
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/*
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import RNFetchBlob from 'react-native-fetch-blob';
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const { writeFile, readFile, dirs:{ DocumentDir } } = RNFetchBlob.fs;
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const DDP = DocumentDir + "/";
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const input = res => res.map(x => String.fromCharCode(x)).join("");
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const output = str => str.split("").map(x => x.charCodeAt(0));
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*/
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const make_cols = refstr => Array.from({length: XLSX.utils.decode_range(refstr).e.c + 1}, (x,i) => XLSX.utils.encode_col(i));
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export default class SheetJS extends Component {
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constructor(props) {
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super(props);
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this.state = {
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data: [[1,2,3],[4,5,6]],
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cols: make_cols("A1:C2")
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};
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this.importFile = this.importFile.bind(this);
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this.exportFile = this.exportFile.bind(this);
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};
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importFile() {
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Alert.alert("Rename file to sheetjs.xlsx", "Copy to " + DDP, [
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{text: 'Cancel', onPress: () => {}, style: 'cancel' },
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{text: 'Import', onPress: () => {
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readFile(DDP + "sheetjs.xlsx", 'ascii').then((res) => {
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/* parse file */
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const wb = XLSX.read(input(res), {type:'binary'});
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/* convert first worksheet to AOA */
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const wsname = wb.SheetNames[0];
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const ws = wb.Sheets[wsname];
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const data = XLSX.utils.sheet_to_json(ws, {header:1});
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/* update state */
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this.setState({ data: data, cols: make_cols(ws['!ref']) });
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}).catch((err) => { Alert.alert("importFile Error", "Error " + err.message); });
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}}
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]);
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}
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exportFile() {
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/* convert AOA back to worksheet */
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const ws = XLSX.utils.aoa_to_sheet(this.state.data);
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/* build new workbook */
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const wb = XLSX.utils.book_new();
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XLSX.utils.book_append_sheet(wb, ws, "SheetJS");
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/* write file */
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const wbout = XLSX.write(wb, {type:'binary', bookType:"xlsx"});
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const file = DDP + "sheetjsw.xlsx";
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writeFile(file, output(wbout), 'ascii').then((res) =>{
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Alert.alert("exportFile success", "Exported to " + file);
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}).catch((err) => { Alert.alert("exportFile Error", "Error " + err.message); });
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};
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render() { return (
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<View style={styles.container}>
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<Image style={{width: 128, height: 128}} source={require('./logo.png')} />
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<Text style={styles.welcome}>SheetJS React Native Demo</Text>
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<Text style={styles.instructions}>Import Data</Text>
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<Button onPress={this.importFile} title="Import data from a spreadsheet" color="#841584" />
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<Text style={styles.instructions}>Export Data</Text>
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<Button disabled={!this.state.data.length} onPress={this.exportFile} title="Export data to XLSX" color="#841584" />
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<Text style={styles.instructions}>Current Data</Text>
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<Table style={styles.table}>
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<Row data={this.state.cols} style={styles.thead} textStyle={styles.text}/>
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<Rows data={this.state.data} style={styles.tr} textStyle={styles.text}/>
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</Table>
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</View>
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); };
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};
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const styles = StyleSheet.create({
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container: { flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: '#F5FCFF' },
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welcome: { fontSize: 20, textAlign: 'center', margin: 10 },
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instructions: { textAlign: 'center', color: '#333333', marginBottom: 5 },
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thead: { height: 40, backgroundColor: '#f1f8ff' },
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tr: { height: 30 },
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text: { marginLeft: 5 },
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table: { width: "100%" }
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});
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AppRegistry.registerComponent('SheetJS', () => SheetJS);
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