103 lines
4.0 KiB
JavaScript
103 lines
4.0 KiB
JavaScript
/* sheetjs (C) 2013-present SheetJS -- https://sheetjs.com */
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import { utils } from 'xlsx';
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import React, { Component } from 'react';
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import { AppRegistry, StyleSheet, Text, Button, Alert, Image, ScrollView } from 'react-native';
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import { Table, Row, Rows, TableWrapper } from 'react-native-table-component';
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import { read, write } from 'xlsx';
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import { getDocumentAsync } from 'expo-document-picker';
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import { documentDirectory, readAsStringAsync, writeAsStringAsync } from 'expo-file-system';
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async function pickAndParse() {
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const result = await getDocumentAsync({copyToCacheDirectory: true});
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const path = result.uri;
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const res = await readAsStringAsync(path, { encoding: "base64" });
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return read(res, {type: 'base64'});
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}
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async function writeWorkbook(wb) {
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const wbout = write(wb, {type:'base64', bookType:"xlsx"});
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const file = documentDirectory + "sheetjsw.xlsx";
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await writeAsStringAsync(file, wbout, { encoding: "base64" });
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return file;
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};
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const make_width = ws => {
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const aoa = utils.sheet_to_json(ws, {header:1}), res = [];
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aoa.forEach((r) => { r.forEach((c, C) => { res[C] = Math.max(res[C]||60, String(c).length * 10); }); });
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for(let C = 0; C < res.length; ++C) if(!res[C]) res[C] = 60;
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return res;
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};
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class SheetJSRN 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: ["SheetJS".split(""),[5,4,3,3,7,9,5],[8,6,7,5,3,0,9]],
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widthArr: Array.from({length:7}, () => 20)
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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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async importFile() { try {
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/* select and parse file */
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const wb = await pickAndParse();
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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 = utils.sheet_to_json(ws, {header:1});
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/* update state */
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this.setState({ data: data, widthArr: make_width(ws) });
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} catch(err) { Alert.alert("importFile Error", "Error " + err.message); }}
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async exportFile() { try {
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/* convert AOA back to worksheet */
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const ws = utils.aoa_to_sheet(this.state.data);
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/* build new workbook */
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const wb = utils.book_new();
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utils.book_append_sheet(wb, ws, "SheetJS");
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/* write file */
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const res = await writeWorkbook(wb);
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Alert.alert("exportFile success", "Exported to " + res);
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} catch(err) { Alert.alert("exportFile Error", "Error " + err.message); }}
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render() { return (
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<ScrollView contentContainerStyle={styles.container} vertical={true}>
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<Text style={styles.welcome}> </Text>
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<Text style={styles.welcome}> <Image source={require("./logo.png")} style={styles.image}/> SheetJS × React Native</Text>
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<Button onPress={this.importFile} title="Import data from a spreadsheet" color="#841584" />
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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.bolded}>Current Data</Text>
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<ScrollView style={styles.table} horizontal={true} >
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<Table style={styles.table}>
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<TableWrapper>
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<Row data={this.state.data[0]} style={styles.thead} textStyle={styles.text} widthArr={this.state.widthArr}/>
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</TableWrapper>
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<ScrollView vertical={true}>
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<TableWrapper>
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<Rows data={this.state.data.slice(1)} style={styles.tr} textStyle={styles.text} widthArr={this.state.widthArr}/>
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</TableWrapper>
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</ScrollView>
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</Table>
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</ScrollView>
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</ScrollView>
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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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bolded: { textAlign: 'center', color: '#333333', marginBottom: 5, fontWeight: "bold" },
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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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image: { height: 16, width: 16 }
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});
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AppRegistry.registerComponent('SheetJSRN', () => SheetJSRN); |