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README.md
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This is a new [**React Native**](https://reactnative.dev) project, bootstrapped using [`@react-native-community/cli`](https://github.com/react-native-community/cli).
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# SheetJS + React Native Demo
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# Getting Started
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>**Note**: Make sure you have completed the [React Native - Environment Setup](https://reactnative.dev/docs/environment-setup) instructions till "Creating a new application" step, before proceeding.
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## Step 1: Start the Metro Server
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First, you will need to start **Metro**, the JavaScript _bundler_ that ships _with_ React Native.
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To start Metro, run the following command from the _root_ of your React Native project:
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```bash
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# using npm
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npm start
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# OR using Yarn
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yarn start
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```
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## Step 2: Start your Application
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Let Metro Bundler run in its _own_ terminal. Open a _new_ terminal from the _root_ of your React Native project. Run the following command to start your _Android_ or _iOS_ app:
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### For Android
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```bash
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# using npm
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npm run android
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# OR using Yarn
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yarn android
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```
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### For iOS
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```bash
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# using npm
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npm run ios
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# OR using Yarn
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yarn ios
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```
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If everything is set up _correctly_, you should see your new app running in your _Android Emulator_ or _iOS Simulator_ shortly provided you have set up your emulator/simulator correctly.
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This is one way to run your app — you can also run it directly from within Android Studio and Xcode respectively.
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## Step 3: Modifying your App
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Now that you have successfully run the app, let's modify it.
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1. Open `App.tsx` in your text editor of choice and edit some lines.
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2. For **Android**: Press the <kbd>R</kbd> key twice or select **"Reload"** from the **Developer Menu** (<kbd>Ctrl</kbd> + <kbd>M</kbd> (on Window and Linux) or <kbd>Cmd ⌘</kbd> + <kbd>M</kbd> (on macOS)) to see your changes!
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For **iOS**: Hit <kbd>Cmd ⌘</kbd> + <kbd>R</kbd> in your iOS Simulator to reload the app and see your changes!
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## Congratulations! :tada:
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You've successfully run and modified your React Native App. :partying_face:
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### Now what?
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- If you want to add this new React Native code to an existing application, check out the [Integration guide](https://reactnative.dev/docs/integration-with-existing-apps).
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- If you're curious to learn more about React Native, check out the [Introduction to React Native](https://reactnative.dev/docs/getting-started).
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# Troubleshooting
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If you can't get this to work, see the [Troubleshooting](https://reactnative.dev/docs/troubleshooting) page.
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# Learn More
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To learn more about React Native, take a look at the following resources:
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- [React Native Website](https://reactnative.dev) - learn more about React Native.
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- [Getting Started](https://reactnative.dev/docs/environment-setup) - an **overview** of React Native and how setup your environment.
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- [Learn the Basics](https://reactnative.dev/docs/getting-started) - a **guided tour** of the React Native **basics**.
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- [Blog](https://reactnative.dev/blog) - read the latest official React Native **Blog** posts.
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- [`@facebook/react-native`](https://github.com/facebook/react-native) - the Open Source; GitHub **repository** for React Native.
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Complete Reproduction of <https://docs.sheetjs.com/docs/demos/mobile/reactnative#demo>
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index.js
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/**
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* @format
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*/
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/* 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 {AppRegistry} from 'react-native';
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import App from './App';
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import {name as appName} from './app.json';
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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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AppRegistry.registerComponent(appName, () => App);
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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);
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