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SheetJS 2023-07-02 15:31:24 -04:00
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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).
# SheetJS + React Native Demo
# Getting Started
>**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.
## Step 1: Start the Metro Server
First, you will need to start **Metro**, the JavaScript _bundler_ that ships _with_ React Native.
To start Metro, run the following command from the _root_ of your React Native project:
```bash
# using npm
npm start
# OR using Yarn
yarn start
```
## Step 2: Start your Application
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:
### For Android
```bash
# using npm
npm run android
# OR using Yarn
yarn android
```
### For iOS
```bash
# using npm
npm run ios
# OR using Yarn
yarn ios
```
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.
This is one way to run your app — you can also run it directly from within Android Studio and Xcode respectively.
## Step 3: Modifying your App
Now that you have successfully run the app, let's modify it.
1. Open `App.tsx` in your text editor of choice and edit some lines.
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!
For **iOS**: Hit <kbd>Cmd ⌘</kbd> + <kbd>R</kbd> in your iOS Simulator to reload the app and see your changes!
## Congratulations! :tada:
You've successfully run and modified your React Native App. :partying_face:
### Now what?
- 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).
- If you're curious to learn more about React Native, check out the [Introduction to React Native](https://reactnative.dev/docs/getting-started).
# Troubleshooting
If you can't get this to work, see the [Troubleshooting](https://reactnative.dev/docs/troubleshooting) page.
# Learn More
To learn more about React Native, take a look at the following resources:
- [React Native Website](https://reactnative.dev) - learn more about React Native.
- [Getting Started](https://reactnative.dev/docs/environment-setup) - an **overview** of React Native and how setup your environment.
- [Learn the Basics](https://reactnative.dev/docs/getting-started) - a **guided tour** of the React Native **basics**.
- [Blog](https://reactnative.dev/blog) - read the latest official React Native **Blog** posts.
- [`@facebook/react-native`](https://github.com/facebook/react-native) - the Open Source; GitHub **repository** for React Native.
Complete Reproduction of <https://docs.sheetjs.com/docs/demos/mobile/reactnative#demo>

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/**
* @format
*/
/* sheetjs (C) 2013-present SheetJS -- https://sheetjs.com */
import { utils } from 'xlsx';
import React, { Component } from 'react';
import { AppRegistry, StyleSheet, Text, Button, Alert, Image, ScrollView } from 'react-native';
import { Table, Row, Rows, TableWrapper } from 'react-native-table-component';
import {AppRegistry} from 'react-native';
import App from './App';
import {name as appName} from './app.json';
const make_width = ws => {
const aoa = utils.sheet_to_json(ws, {header:1}), res = [];
aoa.forEach((r) => { r.forEach((c, C) => { res[C] = Math.max(res[C]||60, String(c).length * 10); }); });
for(let C = 0; C < res.length; ++C) if(!res[C]) res[C] = 60;
return res;
};
AppRegistry.registerComponent(appName, () => App);
class SheetJSRN extends Component {
constructor(props) {
super(props);
this.state = {
data: ["SheetJS".split(""),[5,4,3,3,7,9,5],[8,6,7,5,3,0,9]],
widthArr: Array.from({length:7}, () => 20)
};
this.importFile = this.importFile.bind(this);
this.exportFile = this.exportFile.bind(this);
};
async importFile() { try {
/* select and parse file */
const wb = await pickAndParse();
/* convert first worksheet to AOA */
const wsname = wb.SheetNames[0];
const ws = wb.Sheets[wsname];
const data = utils.sheet_to_json(ws, {header:1});
/* update state */
this.setState({ data: data, widthArr: make_width(ws) });
} catch(err) { Alert.alert("importFile Error", "Error " + err.message); }}
async exportFile() { try {
/* convert AOA back to worksheet */
const ws = utils.aoa_to_sheet(this.state.data);
/* build new workbook */
const wb = utils.book_new();
utils.book_append_sheet(wb, ws, "SheetJS");
/* write file */
const res = await writeWorkbook(wb);
Alert.alert("exportFile success", "Exported to " + res);
} 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}> <Image source={require("./logo.png")} style={styles.image}/> &nbsp; SheetJS × React Native</Text>
<Button onPress={this.importFile} title="Import data from a spreadsheet" color="#841584" />
<Button disabled={!this.state.data.length} onPress={this.exportFile} title="Export data to XLSX" color="#841584" />
<Text style={styles.bolded}>Current Data</Text>
<ScrollView style={styles.table} horizontal={true} >
<Table style={styles.table}>
<TableWrapper>
<Row data={this.state.data[0]} style={styles.thead} textStyle={styles.text} widthArr={this.state.widthArr}/>
</TableWrapper>
<ScrollView vertical={true}>
<TableWrapper>
<Rows data={this.state.data.slice(1)} style={styles.tr} textStyle={styles.text} widthArr={this.state.widthArr}/>
</TableWrapper>
</ScrollView>
</Table>
</ScrollView>
</ScrollView>
); };
};
const styles = StyleSheet.create({
container: { flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: '#F5FCFF' },
welcome: { fontSize: 20, textAlign: 'center', margin: 10 },
bolded: { textAlign: 'center', color: '#333333', marginBottom: 5, fontWeight: "bold" },
thead: { height: 40, backgroundColor: '#f1f8ff' },
tr: { height: 30 },
text: { marginLeft: 5, },
table: { width: "100%" },
image: { height: 16, width: 16 }
});
AppRegistry.registerComponent('SheetJSRN', () => SheetJSRN);