xsheetjs/demos/react/react-native.js

180 lines
6.0 KiB
JavaScript

/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
import XLSX from 'xlsx';
import React, { Component } from 'react';
import {
AppRegistry,
StyleSheet,
Text,
View,
Button,
Alert,
Image,
ScrollView,
TouchableWithoutFeedback
} from 'react-native';
import { Table, Row, Rows, TableWrapper } from 'react-native-table-component';
// react-native-file-access
var Base64 = function() {
var map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
return {
encode: function(input) {
var o = "";
var c1 = 0, c2 = 0, c3 = 0, e1 = 0, e2 = 0, e3 = 0, e4 = 0;
for (var i = 0; i < input.length; ) {
c1 = input.charCodeAt(i++);
e1 = c1 >> 2;
c2 = input.charCodeAt(i++);
e2 = (c1 & 3) << 4 | c2 >> 4;
c3 = input.charCodeAt(i++);
e3 = (c2 & 15) << 2 | c3 >> 6;
e4 = c3 & 63;
if (isNaN(c2)) {
e3 = e4 = 64;
} else if (isNaN(c3)) {
e4 = 64;
}
o += map.charAt(e1) + map.charAt(e2) + map.charAt(e3) + map.charAt(e4);
}
return o;
},
decode: function(input) {
var o = "";
var c1 = 0, c2 = 0, c3 = 0, e1 = 0, e2 = 0, e3 = 0, e4 = 0;
input = input.replace(/[^\w\+\/\=]/g, "");
for (var i = 0; i < input.length; ) {
e1 = map.indexOf(input.charAt(i++));
e2 = map.indexOf(input.charAt(i++));
c1 = e1 << 2 | e2 >> 4;
o += String.fromCharCode(c1);
e3 = map.indexOf(input.charAt(i++));
c2 = (e2 & 15) << 4 | e3 >> 2;
if (e3 !== 64) {
o += String.fromCharCode(c2);
}
e4 = map.indexOf(input.charAt(i++));
c3 = (e3 & 3) << 6 | e4;
if (e4 !== 64) {
o += String.fromCharCode(c3);
}
}
return o;
}
};
}();
import { Dirs, FileSystem } from 'react-native-file-access';
const DDP = Dirs.DocumentDir + "/";
const readFile = (path, enc) => FileSystem.readFile(path, "base64");
const writeFile = (path, data, enc) => FileSystem.writeFile(path, data, "base64");
const input = res => Base64.decode(res);
const output = str => Base64.encode(str);
// react-native-fs
/*
import { writeFile, readFile, DocumentDirectoryPath } from 'react-native-fs';
const DDP = DocumentDirectoryPath + "/";
const input = res => res;
const output = str => str;
*/
// react-native-fetch-blob
/*
import RNFetchBlob from 'react-native-fetch-blob';
const { writeFile, readFile, dirs:{ DocumentDir } } = RNFetchBlob.fs;
const DDP = DocumentDir + "/";
const input = res => res.map(x => String.fromCharCode(x)).join("");
const output = str => str.split("").map(x => x.charCodeAt(0));
*/
const make_cols = refstr => Array.from({length: XLSX.utils.decode_range(refstr).e.c + 1}, (x,i) => XLSX.utils.encode_col(i));
const make_width = refstr => Array.from({length: XLSX.utils.decode_range(refstr).e.c + 1}, () => 60);
export default class SheetJS extends Component {
constructor(props) {
super(props);
this.state = {
data: [[2,3,4],[3,4,5]],
widthArr: [60, 60, 60],
cols: make_cols("A1:C2")
};
this.importFile = this.importFile.bind(this);
this.exportFile = this.exportFile.bind(this);
};
importFile() {
Alert.alert("Rename file to sheetjs.xlsx", "Copy to " + DDP, [
{text: 'Cancel', onPress: () => {}, style: 'cancel' },
{text: 'Import', onPress: () => {
readFile(DDP + "sheetjs.xlsx", 'ascii').then((res) => {
/* parse file */
const wb = XLSX.read(input(res), {type:'binary'});
/* convert first worksheet to AOA */
const wsname = wb.SheetNames[0];
const ws = wb.Sheets[wsname];
const data = XLSX.utils.sheet_to_json(ws, {header:1});
/* update state */
this.setState({ data: data, cols: make_cols(ws['!ref']), widthArr: make_width(ws['!ref']) });
}).catch((err) => { Alert.alert("importFile Error", "Error " + err.message); });
}}
]);
}
exportFile() {
/* convert AOA back to worksheet */
const ws = XLSX.utils.aoa_to_sheet(this.state.data);
/* build new workbook */
const wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, "SheetJS");
/* write file */
const wbout = XLSX.write(wb, {type:'binary', bookType:"xlsx"});
const file = DDP + "sheetjsw.xlsx";
writeFile(file, output(wbout), 'ascii').then((res) =>{
Alert.alert("exportFile success", "Exported to " + file);
}).catch((err) => { Alert.alert("exportFile Error", "Error " + err.message); });
};
render() {
return (
<ScrollView contentContainerStyle={styles.container} vertical={true}>
<Text style={styles.welcome}> </Text>
<Text style={styles.welcome}>SheetJS React Native Demo</Text>
<Text style={styles.instructions}>Import Data</Text>
<Button onPress={this.importFile} title="Import data from a spreadsheet" color="#841584" />
<Text style={styles.instructions}>Export Data</Text>
<Button disabled={!this.state.data.length} onPress={this.exportFile} title="Export data to XLSX" color="#841584" />
<Text style={styles.instructions}>Current Data</Text>
<ScrollView style={styles.table} horizontal={true} >
<Table style={styles.table}>
<TableWrapper>
<Row data={this.state.cols} style={styles.thead} textStyle={styles.text} widthArr={this.state.widthArr}/>
</TableWrapper>
<TouchableWithoutFeedback>
<ScrollView vertical={true}>
<TableWrapper>
<Rows data={this.state.data} style={styles.tr} textStyle={styles.text} widthArr={this.state.widthArr}/>
</TableWrapper>
</ScrollView>
</TouchableWithoutFeedback>
</Table>
</ScrollView>
</ScrollView>
);
};
};
const styles = StyleSheet.create({
container: { flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: '#F5FCFF' },
welcome: { fontSize: 20, textAlign: 'center', margin: 10 },
instructions: { textAlign: 'center', color: '#333333', marginBottom: 5 },
thead: { height: 40, backgroundColor: '#f1f8ff' },
tr: { height: 30 },
text: { marginLeft: 5 },
table: { width: "100%" }
});
AppRegistry.registerComponent('SheetJS', () => SheetJS);