docs.sheetjs.com/docz/static/reactnative/App.tsx

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/* sheetjs (C) SheetJS -- https://sheetjs.com */
import React, { useState, useCallback } from 'react';
import { StyleSheet, Text, Button, Alert, Image, ScrollView } from 'react-native';
import { Table, Row, Rows, TableWrapper } from 'react-native-table-component';
import { read, utils, WorkSheet } from 'xlsx';
const make_width = (ws: WorkSheet): number[] => {
const aoa = utils.sheet_to_json(ws, {header:1}), res: number[] = [];
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;
};
function App(): JSX.Element {
const [data, setData] = useState<any[]>([
"SheetJS".split(""),
[5,4,3,3,7,9,5],
[8,6,7,5,3,0,9]
]);
const [widths, setWidths] = useState<number[]>(Array.from({length:7}, () => 20));
const importFile = useCallback(async() => {
try {
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const ab = await (await fetch("https://docs.sheetjs.com/pres.numbers")).arrayBuffer();
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const wb = read(ab);
/* 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 */
setData(data);
setWidths(make_width(ws));
} catch(err) {
Alert.alert("importFile Error", "Error " + ((err as any).message || err));
}
}, []);
return (
<ScrollView contentContainerStyle={styles.container}>
<Text style={styles.welcome}> </Text>
<Text style={styles.welcome}> <Image source={require("./logo.png")} style={styles.image}/> &nbsp; SheetJS × React Native</Text>
<Button onPress={importFile} title="Import data from a spreadsheet" color="#841584" />
<Text style={styles.bolded}>Current Data</Text>
<ScrollView style={styles.table} horizontal={true} >
<Table style={styles.table}>
<TableWrapper>
<Row data={data[0]} style={styles.thead} textStyle={styles.text} widthArr={widths}/>
</TableWrapper>
<ScrollView>
<TableWrapper>
<Rows data={data.slice(1)} style={styles.tr} textStyle={styles.text} widthArr={widths}/>
</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 }
});
export default App;