I am trying to use react native to post the data into a php api in a mobile apps. But after I successful scan the barcode it read the data but it could not post the value to the api
scanner.js
import React, { useState, useEffect,Component,onMount} from 'react';
import { Text,TextInput, View, StyleSheet, Button } from 'react-native';
import { BarCodeScanner } from 'expo-barcode-scanner';
import {useNavigation} from'@react-navigation/native';
import {StatusBar} from 'expo-status-bar';
export default function Scanner () {
const [hasPermission, setHasPermission] = useState(null);
const [scanned, setScanned] = useState(false);
const [userid, setText] = useState('Not yet scanned')
const [currentDate, setCurrentDate] = useState('');
const navigation = useNavigation();
const askForCameraPermission = () => {
(async () => {
const { status } = await BarCodeScanner.requestPermissionsAsync();
setHasPermission(status === 'granted');
})()
}
// Request Camera Permission
useEffect(() => {
askForCameraPermission();
}, []);
Register = () => {
this.state={
userid:''
}
let userid = this.state.userid;
let InsertAPIURL = "http://localhost/api/insert.php";
let headers = {
'Accept': 'application/json',
'Content-Type': 'application/json'
};
const Data={userid};
fetch(InsertAPIURL, {
method: 'POST',
headers: headers,
body: JSON.stringify(Data)
})
.then((response) =>response.json())
.then((response)=>{
alert(response[0].Message);
})
.catch((error) => {
alert("Error"+error);
})
}
useEffect(() => {
var date = new Date().getDate(); //Current Date
var month = new Date().getMonth() + 1; //Current Month
var year = new Date().getFullYear(); //Current Year
var hours = new Date().getHours(); //Current Hours
var min = new Date().getMinutes(); //Current Minutes
var sec = new Date().getSeconds(); //Current Seconds
setCurrentDate(
date + '/' + month + '/' + year
+ ' ' + hours + ':' + min + ':' + sec
);
}, []);
// What happens when we scan the bar code
const handleBarCodeScanned = ({ type, data }) => {
setScanned(true);
setText(data )
};
// Check permissions and return the screens
if (hasPermission === null) {
return (
<View style={styles.container}>
<Text>Requesting for camera permission</Text>
</View>)
}
if (hasPermission === false) {
return (
<View style={styles.container}>
<Text style={{ margin: 10 }}>No access to camera</Text>
<Button title={'Allow Camera'} onPress={() => askForCameraPermission()} />
</View>)
}
// Return the View
return (
<View style={styles.container}>
<View style={styles.barcodebox}>
<BarCodeScanner
onBarCodeScanned={scanned ? undefined : handleBarCodeScanned}
style={{ height: 400, width: 400 }} />
</View>
<Text style={styles.maintext}>{userid + '\n'+currentDate}
</Text>
{
scanned && <Button title={'Scan again?'} onPress={() => setScanned(false)} color='tomato' />
}
{
scanned && <Button title={'OK'}onPress={Register}/>
}
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
alignItems: 'center',
justifyContent: 'center',
},
maintext: {
fontSize: 16,
margin: 20,
},
barcodebox: {
alignItems: 'center',
justifyContent: 'center',
height: 300,
width: 300,
overflow: 'hidden',
borderRadius: 30,
backgroundColor: 'tomato'
}
});
api php script
<?php
$CN = mysqli_connect('localhost', 'root', '');
$DB = mysqli_select_db($CN, 'memberdata');
$EncodedData = file_get_contents('php://input');
$DecodedData = json_decode($EncodedData, true);
$userid = $DecodedData['userid'];
$insertMemberData = "insert into member(user) values ('$userid')";
$register = mysqli_query($CN, $insertMemberData);
if ($register)
$Message = "Member has been registered successfully";
else
$Message = "Server Error... please try latter";
$Response[] = array("Message" => $Message);
echo json_encode($Response);
?>
high chance the error will be in Register function and the return side
I am new to react native I hope that someone could point out my mistake or error.
