Develop Reference

How to change change and track boolean state of each element in an array

Im trying to make it so that when a TouchableHighlight is pressed in react native it goes from one colour to another. I have state that is set to false and changes when the button is pressed. However this changes the colour for all elements in the map rather than for each item individually. Is there a way to update the state for each element independently?
Here is my code:
function OnboardingVibes() {
const [pressed, setPressed] = useState(false);
return (
<View style={{marginTop: 40}}>
<Text style={{fontSize: 22, color: '#FFF', marginBottom: 16}}>Vibes</Text>
<View style={styles.buttonContainer}>
{vibes.map((vibe) => {
return (
<TouchableHighlight onPress={() => setPressed(true)} style={{backgroundColor: pressed ? '#DDD' : '#4D2C5B', margin: 4, borderRadius: 4}} key={`vibe-${vibe}`}>
<Text style={styles.vibeButton}>{vibe}</Text>
</TouchableHighlight>
)
})}
</View>
</View>
);
}

One way to do it is to move the state down so you could have individual states. When the state is true at the top-level, all child components will receive the same state.
function TouchableVibe({vibe}) {
const [pressed, setPressed] = useState(false);
return (
<TouchableHighlight
onPress={() => setPressed(true)}
style={{
backgroundColor: pressed ? "#DDD" : "#4D2C5B",
margin: 4,
borderRadius: 4,
}}
>
<Text style={styles.vibeButton}>{vibe}</Text>
</TouchableHighlight>
);
}
function OnboardingVibes() {
return (
<View style={{ marginTop: 40 }}>
<Text style={{ fontSize: 22, color: "#FFF", marginBottom: 16 }}>
Vibes
</Text>
<View style={styles.buttonContainer}>
{vibes.map((vibe) => (
<TouchableVibe key={`vibe-${vibe}`} vibe={vibe} />
))}
</View>
</View>
);
}

const [pressed, setPressed] = useState(vibes.map(e=>false));
{vibes.map((vibe, index) => {
return (
<TouchableHighlight onPress={() => {
let new_Pressed =vibes.map(e=>false)
new_pressed[index]=true;
setPressed(new_pressed);
}}
style={{backgroundColor: pressed[index]
? '#DDD'
: '#4D2C5B',
margin: 4, borderRadius: 4}} key={`vibe-${vibe}`}>
<Text style={styles.vibeButton}>{vibe}</Text>
</TouchableHighlight>
)
})}

Instead of passing in a boolean to the state, pass in the id/vibe instead, and then in your conditional logic within the map you can determine if that single item is the same as the one you've clicked.
function OnboardingVibes() {
const [pressed, setPressed] = useState('');
return (
<View style={{marginTop: 40}}>
<Text style={{fontSize: 22, color: '#FFF', marginBottom: 16}}>Vibes</Text>
<View style={styles.buttonContainer}>
{vibes.map((vibe) => {
return (
<TouchableHighlight onPress={() => setPressed(vibe)} style={{backgroundColor: pressed === vibe ? '#DDD' : '#4D2C5B', margin: 4, borderRadius: 4}} key={`vibe-${vibe}`}>
<Text style={styles.vibeButton}>{vibe}</Text>
</TouchableHighlight>
)
})}
</View>
</View>
);
}

How to filter data of a List using Checkboxes in Expo?

I am trying to implement a function in Expo to filter my data using checkboxes. I have already completed my checkboxes and designed them accordingly. The data to be filtered is pulled from the Firebase database and displayed in the form of a list on my page. I have also created a button for the filtering, which is used so that when a user clicks this button, the filtering takes place according to the selection of the respective boxes. Attached is a picture that shows what has already been implemented and below the code for it. I would be very grateful if someone could help me with this, as I am relatively new to React Native and have not found anything in this regard.
Thanks in advance
Anbieterliste-Screen
function MyCheckbox() {
const [checked, onChange] = useState(false);
function onCheckmarkPress() {
onChange(!checked);
}
return (
<Pressable
style={[styles.checkboxBase, checked && styles.checkboxChecked]}
onPress={onCheckmarkPress}>
{checked && <Ionicons name="checkmark" size={18} color="white" />}
</Pressable>
);
}
export default function Anbieter({ route, navigation }) {
//CONSTS WHICH WE GOT FROM THE HOMEPAGE AND DECLARATION
const { latitude, longitude, address } = route.params;
var getLat = latitude;
var getLong = longitude;
var getAddress = JSON.stringify(address);
const [restaurentList, setRestaurentList] = useState()
const [currentUsers, setCurrentUsers] = useState()
const [ranges, setRanges] = useState(1)
const [showRange, setShowRange] = useState(false)
// THIS IS A LIST WHICH DISPLAY ALL RESTAURANTS BY GETTING DATA IN PARAMS IN NAME OF DATA
const ListButton = ({ title, data }) => {
return (
<TouchableOpacity onPress={() => { navigation.navigate('Produktubersicht', { data }) }} style={[styles.itemContainer]}>
<Image source={{ uri: data.anbieterImg }} style={{ width: '90%', marginLeft: '5%', height: 160 }} />
<Text style={{ fontSize: 16, fontWeight: "bold", marginLeft: 20 }}>{data.firmenname}</Text>
<Text style={{ fontSize: 16, fontWeight: "bold", marginLeft: 20, width: '90%' }}>Adresse:
<Text style={{ fontSize: 16, fontWeight: 'normal' }}>{data.adresse}</Text>
</Text>
<Text style={{ fontSize: 16, fontWeight: "bold", marginLeft: 20, width: '90%' }}>Kategorie:
<Text style={{ fontSize: 16, fontWeight: 'normal' }}>{data.kategorie}</Text>
</Text>
</TouchableOpacity>
);
}
// THIS FUNCTION IS USE TO CALL ALL RESTAURANT FROM FIREBASE DATABASE
const getRestaurents = async () => {
let arr = []
// THIS IS FIREBASE API ALL DATA IS COMING FROM FIREBASE
var ar = await firebase.database().ref("/anbieter/").once("child_added", snapshot => {
var obj = snapshot.val();
obj.id = snapshot.key;
arr.push(obj);
});
// ALL DATA OF RESTAURANT IS STORING IN STATE HERE THEN FROM HERE ALL DATA WILL DISPLAY
setRestaurentList(arr)
}
var users = firebase.auth().currentUser;
useEffect(() => {
// WE CALL GET RESTAURANTS API HERE BECAUSE THIS USEEFFECT JUST CALL ONCE WHEN COMPONENT RENDER
console.log(users, 'users');
getRestaurents()
}, []);
// THIS IS SIGN OUT BUTTON , WHEN USER CLICK FOR SIGNOUT THEN IT ASKS WHETHER HE/SHE IS SURE TO DO SO
const signOutFunc = async () => {
Alert.alert(
"Ausloggen?",
"Sind Sie sicher, dass Sie sich ausloggen möchten?",
[
{
text: "Bestätigen", onPress: async () => {
await AsyncStorage.removeItem('userName')
await AsyncStorage.removeItem('order')
firebase.auth().signOut();
navigation.navigate('Homepage');
}
},
{
text: "Abbrechen",
style: "cancel"
}
]
);
}
return (
<ScrollView>
{/* THIS IS THE PART OF ICON WHERE LOGIN , SIGNOUT , Bestellverlauf AND Warenkorb ICON ARE HERE */}
<View style={styles.container}>
<View style={{ flexDirection: 'row', justifyContent: 'space-between', marginRight: 5, marginVertical: 10 }}>
{users ?
<TouchableOpacity onPress={() => { signOutFunc() }}>
<Entypo name="log-out" size={30} color="black" />
</TouchableOpacity>
: null}
{users ?
<View style={{ flexDirection: 'row', }}>
<TouchableOpacity onPress={() => { navigation.navigate('Bestellverlauf') }} style={{ marginRight: 20 }}>
<Fontisto name="prescription" size={30} color="black" />
</TouchableOpacity>
<TouchableOpacity onPress={() => { navigation.navigate('Warenkorb') }}>
<Feather name="shopping-bag" size={30} color="black" />
</TouchableOpacity>
</View>
:
<TouchableOpacity style={{ flexDirection: 'row' }} onPress={() => { navigation.navigate('Anmelden') }}>
<FontAwesome5 name="user" size={30} color="black" />
<Text style={{ margin: 10 }}>Registration/Login</Text>
</TouchableOpacity>
}
</View>
<Text style={styles.textFirst}>Ermittelte Adresse:</Text>
<View style={{ alignContent: 'center', flexDirection: 'row', width: '90%' }}>
<Text style={{ marginBottom: 15, marginTop: 10, marginHorizontal: 10 }}>{getAddress} </Text>
<TouchableOpacity onPress={() => { setShowRange(!showRange) }}>
<MaterialCommunityIcons name="filter-plus" size={30} color="grey" />
</TouchableOpacity>
</View>
{/* THIS IS RANGE SLIDER FOR SORTING ALL RESTAURANTS */}
{showRange ?
<View>
<View style={{ flexDirection: 'row', justifyContent: "space-between" }}>
<Text style={{ marginLeft: '3%', fontSize: 14, fontWeight: 'bold' }}> Entfernung festlegen!</Text>
<Text style={{ marginLeft: '3%' }}> {Math.round(ranges)} km</Text>
</View>
<Slider maximumValue={100} style={{ width: '90%', marginLeft: '5%', marginTop: 10, }} value={ranges} onValueChange={(e) => setRanges(e)} />
<View style={{ marginTop: 10 }}>
<Text style={{ marginLeft: '3%', fontSize: 14, fontWeight: 'bold', marginBottom: 10, }}>Filterung nach Kategorie</Text>
<View style={styles.checkboxContainer}>
<MyCheckbox />
<Text style={styles.checkboxLabel}>Backware</Text>
</View>
<View style={styles.checkboxContainer}>
<MyCheckbox />
<Text style={styles.checkboxLabel}>Bioprodukte</Text>
</View>
<View style={styles.checkboxContainer}>
<MyCheckbox />
<Text style={styles.checkboxLabel}>Feinkost</Text>
</View>
<View style={styles.checkboxContainer}>
<MyCheckbox />
<Text style={styles.checkboxLabel}>Griechische Spezialitäten</Text>
</View>
<View style={styles.checkboxContainer}>
<MyCheckbox />
<Text style={styles.checkboxLabel}>Molkerei</Text>
</View>
<View style={styles.checkboxContainer}>
<MyCheckbox />
<Text style={styles.checkboxLabel}>Türkische Spezialitäten</Text>
</View>
<Button title="Filter anwenden..." color='#5271FF'/>
</View>
</View>
: null
}
<Text style={styles.textSecond}>Sie können gerne die Filterfunktion verwenden, indem Sie oben auf den Symbol klicken...</Text>
{restaurentList && restaurentList.map((val, i) => {
return <ListButton key={i} title={val.firmenname} data={val} />
})}
</View>
</ScrollView>
);
}

A better approach to avoid duplication of code is to create a filterList array and create dynamic filters component.
I modified your code, check the comments for the explanation.
function MyCheckbox({addFilter, removeFilter, filterIndex}) { // ADD THIS PROPS TO ADD AND REMOVE FILTERS
const [checked, onChange] = useState(false);
function onCheckmarkPress() {
onChange(!checked);
checked ? addFilter(filterIndex) : removeFilter(filterIndex)
}
return (
<Pressable
style={[styles.checkboxBase, checked && styles.checkboxChecked]}
onPress={onCheckmarkPress}>
{checked && <Ionicons name="checkmark" size={18} color="white" />}
</Pressable>
);
}
export default function Anbieter({ route, navigation }) {
//CONSTS WHICH WE GOT FROM THE HOMEPAGE AND DECLARATION
const { latitude, longitude, address } = route.params;
var getLat = latitude;
var getLong = longitude;
var getAddress = JSON.stringify(address);
const [restaurentList, setRestaurentList] = useState()
const [filteredRestaurantList, setFilteredRestaurentList] = useState() // <-- ADD THIS STATE TO KEEP TRACK OF THE FILTERED LIST TO DISPLAY
const [currentUsers, setCurrentUsers] = useState()
const [ranges, setRanges] = useState(1)
const [showRange, setShowRange] = useState(false)
const [filters, setFilters] = useState([]) // <-- ADD THIS STATE TO KEEP TRACK OF THE FILTERS SELECTED
const filterList = ["Backware", "Bioprodukte", "Feinkost", "Griechische Spezialitäten"] // <--- CREATE A FILTER ARRAY
const addFilter = (filterIndex) => { // <-- FUNCTION ADD FILTER
setFilters([...filters, filterList[filterIndex]])
}
const removeFilter = (filterIndex) => { // <-- FUNCTION REMOVE FILTER
const index = filters.indexOf(filterList[filterIndex]);
const newFilters = [...filters];
newFilters.splice(index, 1)
setFilters(newFilters)
}
// THIS IS A LIST WHICH DISPLAY ALL RESTAURANTS BY GETTING DATA IN PARAMS IN NAME OF DATA
const ListButton = ({ title, data }) => {
return (
<TouchableOpacity onPress={() => { navigation.navigate('Produktubersicht', { data }) }} style={[styles.itemContainer]}>
<Image source={{ uri: data.anbieterImg }} style={{ width: '90%', marginLeft: '5%', height: 160 }} />
<Text style={{ fontSize: 16, fontWeight: "bold", marginLeft: 20 }}>{data.firmenname}</Text>
<Text style={{ fontSize: 16, fontWeight: "bold", marginLeft: 20, width: '90%' }}>Adresse:
<Text style={{ fontSize: 16, fontWeight: 'normal' }}>{data.adresse}</Text>
</Text>
<Text style={{ fontSize: 16, fontWeight: "bold", marginLeft: 20, width: '90%' }}>Kategorie:
<Text style={{ fontSize: 16, fontWeight: 'normal' }}>{data.kategorie}</Text>
</Text>
</TouchableOpacity>
);
}
// THIS FUNCTION IS USE TO CALL ALL RESTAURANT FROM FIREBASE DATABASE
const getRestaurents = async () => {
let arr = []
// THIS IS FIREBASE API ALL DATA IS COMING FROM FIREBASE
var ar = await firebase.database().ref("/anbieter/").once("child_added", snapshot => {
var obj = snapshot.val();
obj.id = snapshot.key;
arr.push(obj);
});
// ALL DATA OF RESTAURANT IS STORING IN STATE HERE THEN FROM HERE ALL DATA WILL DISPLAY
setRestaurentList(arr)
setFilteredRestaurentList(arr)
}
var users = firebase.auth().currentUser;
useEffect(() => {
// WE CALL GET RESTAURANTS API HERE BECAUSE THIS USEEFFECT JUST CALL ONCE WHEN COMPONENT RENDER
console.log(users, 'users');
getRestaurents()
}, []);
useEffect(() => { // <--- ADD THIS TO UPDATE THE FILTER RESTAURANT LIST EVERY TIME THAT THE FILTER ARRAY CHANGE
const rList = [...restaurentList];
if (filters.length) {
const filteredList = rList.filter(r => {
const toAdd = filters.indexOf(r.category)
if (toAdd !== -1) {
return r
}
})
setFilteredRestaurentList(filteredList)
}else { // <-- IF THERE ARE NO FILTER; RESET TO ORIGINAL LIST
setFilteredRestaurentList(rList)
}
}, [filters]);
return (
<ScrollView>
{/* THIS IS THE PART OF ICON WHERE LOGIN , SIGNOUT , Bestellverlauf AND Warenkorb ICON ARE HERE */}
<View style={styles.container}>
<View style={{ flexDirection: 'row', justifyContent: 'space-between', marginRight: 5, marginVertical: 10 }}>
{users ?
<TouchableOpacity onPress={() => { signOutFunc() }}>
<Entypo name="log-out" size={30} color="black" />
</TouchableOpacity>
: null}
{users ?
<View style={{ flexDirection: 'row', }}>
<TouchableOpacity onPress={() => { navigation.navigate('Bestellverlauf') }} style={{ marginRight: 20 }}>
<Fontisto name="prescription" size={30} color="black" />
</TouchableOpacity>
<TouchableOpacity onPress={() => { navigation.navigate('Warenkorb') }}>
<Feather name="shopping-bag" size={30} color="black" />
</TouchableOpacity>
</View>
:
<TouchableOpacity style={{ flexDirection: 'row' }} onPress={() => { navigation.navigate('Anmelden') }}>
<FontAwesome5 name="user" size={30} color="black" />
<Text style={{ margin: 10 }}>Registration/Login</Text>
</TouchableOpacity>
}
</View>
<Text style={styles.textFirst}>Ermittelte Adresse:</Text>
<View style={{ alignContent: 'center', flexDirection: 'row', width: '90%' }}>
<Text style={{ marginBottom: 15, marginTop: 10, marginHorizontal: 10 }}>{getAddress} </Text>
<TouchableOpacity onPress={() => { setShowRange(!showRange) }}>
<MaterialCommunityIcons name="filter-plus" size={30} color="grey" />
</TouchableOpacity>
</View>
{/* THIS IS RANGE SLIDER FOR SORTING ALL RESTAURANTS */}
{showRange ?
<View>
<View style={{ flexDirection: 'row', justifyContent: "space-between" }}>
<Text style={{ marginLeft: '3%', fontSize: 14, fontWeight: 'bold' }}> Entfernung festlegen!</Text>
<Text style={{ marginLeft: '3%' }}> {Math.round(ranges)} km</Text>
</View>
<Slider maximumValue={100} style={{ width: '90%', marginLeft: '5%', marginTop: 10, }} value={ranges} onValueChange={(e) => setRanges(e)} />
<View style={{ marginTop: 10 }}>
<Text style={{ marginLeft: '3%', fontSize: 14, fontWeight: 'bold', marginBottom: 10, }}>Filterung nach Kategorie</Text>
{filterList.map((filterItem, index) => (
<View
key={index}
style={styles.checkboxContainer}>
<MyCheckbox
addFilter={addFilter} // <-- ADD THIS PROP
removeFilter={removeFilter} // <-- ADD THIS PROP
filterIndex={index} // <-- ADD THIS PROP
/>
<Text style={styles.checkboxLabel}>filterItem</Text>
</View>
))}
<Button title="Filter anwenden..." color='#5271FF'/>
</View>
</View>
: null
}
<Text style={styles.textSecond}>Sie können gerne die Filterfunktion verwenden, indem Sie oben auf den Symbol klicken...</Text>
{filteredRestaurantList && filteredRestaurantList.map((val, i) => {
return <ListButton key={i} title={val.firmenname} data={val} />
})}
</View>
</ScrollView>
);
}

How to rerender item by clicking on it expo js?

I have a flatlist with rendered list of items. I need for each item to change circle to checked-circle on click and go back on second click. I tried to do it with changing item prop isChecked but circle doesn't rerender until I go out of the screen and came back. How may I fix my problem?
Here is my rendering code:
const renderItems = ({ item }) => (
<TouchableOpacity
onPress={() => (item.isChecked = !item.isChecked)}
style={
item.isMarked
? {
backgroundColor: '#FE2C55',
flexDirection: 'row',
alignItems: 'center',
height: word_height
}
: { flexDirection: 'row', alignItems: 'center', height: word_height }
}
>
<View
style={{
width: 45,
justifyContent: 'center',
alignItems: 'center',
height: '100%',
backgroundColor: '#F6FFE0'
}}
>
{item.isChecked ? (
<Feather name="check-circle" size={25} color="#3D5201" />
) : (
<Feather name="circle" size={25} color="#3D5201" />
)}
</View>
<View style={styles.word_line}>
<View style={{ width: word_width, paddingLeft: 20 }}>
<Text style={{ fontSize: 20 }}>{item.word}</Text>
</View>
<View style={{ width: word_width, paddingLeft: 20 }}>
<Text style={{ fontSize: 20 }}>{item.translation}</Text>
</View>
</View>
</TouchableOpacity>
);

On this line, you are trying to mutate the props variable, so react will not update the component when the props state is mutated.
onPress={() => (item.isChecked = !item.isChecked)}
To do this, create a separate component (based on the name of the renderItems method, I guess it's just a function in the component) and add state to it.
Use useState and the initial state value that was taken from the props initialIsChecked
const Item = ({isMarked, isChecked: initialIsChecked, word, translation}) => {
const [isChecked, setIsChecked] = useState(initialIsChecked);
const handleClick = () => {
setIsChecked((prev) => !prev);
};
return (
<TouchableOpacity
onPress={handleClick}
style={
isMarked
? {
backgroundColor: '#FE2C55',
flexDirection: 'row',
alignItems: 'center',
height: word_height,
}
: {flexDirection: 'row', alignItems: 'center', height: word_height}
}>
<View
style={{
width: 45,
justifyContent: 'center',
alignItems: 'center',
height: '100%',
backgroundColor: '#F6FFE0',
}}>
{isChecked ? (
<Feather name="check-circle" size={25} color="#3D5201" />
) : (
<Feather name="circle" size={25} color="#3D5201" />
)}
</View>
<View style={styles.word_line}>
<View style={{width: word_width, paddingLeft: 20}}>
<Text style={{fontSize: 20}}>{word}</Text>
</View>
<View style={{width: word_width, paddingLeft: 20}}>
<Text style={{fontSize: 20}}>{translation}</Text>
</View>
</View>
</TouchableOpacity>
);
};
Then the list component should look something like this:
const List = () => {
return <ScrollView>
items.map((item) => (
<Item
key={item.id} // if there is id
isMarked={item.isMarked}
isChecked={item.isChecked}
word={item.word}
translation={item.translation}
/>
)
</ScrollView>;
};

How change the styling of dynamically generated JSX via a button click in React Native

I am generating JSX code based on an array values that I get from a backend API. As shown in the image below I am generating those boxes based on the length of the array. What I want is when I click on any of those boxes the background colour changes.
I want these boxes to behave like a radio button, so only one box has a different background colour at a time. The array name is "hasMultipleWeights".
I only included the relevant parts of the code ...
const ProductDetailsScreen = (props) => {
const productId = props.navigation.getParam("productId");
const selectedProduct = useSelector((state) =>
state.products.products.find((prod) => prod.id === productId)
);
const productsMultipleWeights = useSelector(
(state) => state.products.productsMultipleWeights
);
var hasMultipleWeights = productsMultipleWeights.find(
(prod) => Object.keys(prod)[0] == selectedProduct.id
);
if (hasMultipleWeights) {
hasMultipleWeights = hasMultipleWeights[Object.keys(hasMultipleWeights)[0]];
}
return (
<ScrollView style={{}}>
<View style={styles.screen}>
{hasMultipleWeights && (
<View style={{ alignItems: "center" }}>
<ScrollView
horizontal
contentContainerStyle={{ padding: 2 }}
showsHorizontalScrollIndicator={false}
>
{hasMultipleWeights.map((item) => (
<TouchableOpacity
key={item.id}
onPress={() => {}}
style={{
...styles.productOptions,
backgroundColor: 'white',
}}
>
<Text style={styles.productWeightVolumUnit}>
<Text style={styles.productWeightVolumeValue}>
{NS(item.weight, "Arabic")}
</Text>
{" "}
{selectedProduct.weightVolumeUnit}
</Text>
<MaterialCommunityIcons
name={
selectedProduct.weightVolumeUnit === "كغ"
? "weight-kilogram"
: selectedProduct.weightVolumeUnit === "مل"
? "water"
: "weight-gram"
}
size={26}
color="grey"
style={styles.weightIcon}
/>
</TouchableOpacity>
))}
</ScrollView>
</View>
)}
</View>
</ScrollView>
);
};
const styles = StyleSheet.create({
productOptions: {
shadowColor: "black",
shadowOpacity: 0.26,
elevation: 5,
borderRadius: 10,
backgroundColor: "white",
width: 85,
height: 65,
marginHorizontal: 6,
alignItems: "center",
justifyContent: "center",
shadowRadius: 2,
shadowOffset: { width: 0, height: 1 },
},
});

For changing the color dynamically you have to use state. So, create a new state to check the button that is "checked", you change it in your onPress method and then make the validation.
const ProductDetailsScreen = (props) => {
const [checkedButton, setCheckedButton] = React.useState('')
const productId = props.navigation.getParam("productId");
const selectedProduct = useSelector((state) =>
state.products.products.find((prod) => prod.id === productId)
);
const productsMultipleWeights = useSelector(
(state) => state.products.productsMultipleWeights
);
var hasMultipleWeights = productsMultipleWeights.find(
(prod) => Object.keys(prod)[0] == selectedProduct.id
);
if (hasMultipleWeights) {
hasMultipleWeights = hasMultipleWeights[Object.keys(hasMultipleWeights)[0]];
}
return (
<ScrollView style={{}}>
<View style={styles.screen}>
{hasMultipleWeights && (
<View style={{ alignItems: "center" }}>
<ScrollView
horizontal
contentContainerStyle={{ padding: 2 }}
showsHorizontalScrollIndicator={false}
>
{hasMultipleWeights.map((item) => (
<TouchableOpacity
key={item.id}
onPress={() => setCheckedButton(item.id)}
style={{
...styles.productOptions,
backgroundColor: checkedButton === item.id ? "grey" : "white",
}}
>
<Text style={styles.productWeightVolumUnit}>
<Text style={styles.productWeightVolumeValue}>
{NS(item.weight, "Arabic")}
</Text>
{" "}
{selectedProduct.weightVolumeUnit}
</Text>
<MaterialCommunityIcons
name={
selectedProduct.weightVolumeUnit === "كغ"
? "weight-kilogram"
: selectedProduct.weightVolumeUnit === "مل"
? "water"
: "weight-gram"
}
size={26}
color="grey"
style={styles.weightIcon}
/>
</TouchableOpacity>
))}
</ScrollView>
</View>
)}
</View>
</ScrollView>
);
};
const styles = StyleSheet.create({
productOptions: {
shadowColor: "black",
shadowOpacity: 0.26,
elevation: 5,
borderRadius: 10,
backgroundColor: "white",
width: 85,
height: 65,
marginHorizontal: 6,
alignItems: "center",
justifyContent: "center",
shadowRadius: 2,
shadowOffset: { width: 0, height: 1 },
},
});

Seems like you need to create checkedId state
const [ checkedId, setCheckedId ] = useState('')
useEffect(() =>
// set first box to red at first render
hasMultipleWeights && setCheckedId(hasMultipleWeights[0].id) ,[ hasMultipleWeights ])
...
<TouchableOpacity
key={item.id}
onPress={() =>setCheckedId(item.id)}
style={{
...styles.productOptions,
backgroundColor: item.id == checkedId ? 'red' : 'white',
}}
>

react native : there is way to pass a function into "onpress"?

there is way to pass a function into "onpress" ?
i need to pass the "postData" function into the "onpress" button ,
how can i do it?
in my code the has 2 "onpress" that i want to pass inside the "postData" .
if there some mistake so please let me know and i will fix it .
this is my code for example :
export default class OrderInformationScreen extends Component {
constructor(props) {
super(props);
const { state } = props.navigation;
this.state = {
title: state.params.data
}
//alert(JSON.stringify((state.params.data.SHORT_TEXT)))
}
postData = () => {
const postData = {
ACTOR_ID:"APAZ",
REPORT_KEY:"001",
WORK_ITEM_ID:"000018639250",
NOTE:"fun all time"
}
const axios = require('axios')
axios.post('https://harigotphat1.mekorot.co.il/ConfirmPackaotWS/OrderApprove/OrderApprove_OrderApp_Save_Approvement/'+ postData)
.then(function (response) {
console.log("roei response======>>>>",response);
})
}
render() {
return (
<>
<View
style={{
alignItems: 'flex-start',
justifyContent: 'center',
borderColor: 'blue',
flexDirection: "row",
justifyContent: 'space-evenly'
}}>
<TouchableOpacity onPress={() => console.log("cancel!")}>
<Avatar
size='large'
containerStyle={{ marginTop: 30 }}
activeOpacity={0.2}
rounded
source={require('../assets/down.png')} style={{ height: 80, width: 80 }}
onPress={() => console.log("cancel!")} />
<View >
<Text style={{ fontSize: 25, fontWeight: 'bold', color: 'red' }}>לדחות</Text>
</View>
</TouchableOpacity>
<TouchableOpacity onPress={() => console.log("works!")}> ///HERE I NEED PASS postData
<Avatar
size='large'
activeOpacity={0.1}
rounded
source={require('../assets/up.png')} style={{ height: 80, width: 80 }}
onPress={() => console.log("Works!")} />
<View>
<Text style={{ fontSize: 25, fontWeight: 'bold', color: 'green', marginHorizontal: 6 }}>לאשר</Text>
</View>
</TouchableOpacity>
</View>
<InfoTable headerInfo={this.state.title}></InfoTable>
</>
);
};
}

Check this updated code
export default class OrderInformationScreen extends Component {
constructor(props) {
super(props);
const { state } = props.navigation;
this.state = {
title: state.params.data
};
//alert(JSON.stringify((state.params.data.SHORT_TEXT)))
}
postData = () => {
const postData = {
ACTOR_ID: "APAZ",
REPORT_KEY: "001",
WORK_ITEM_ID: "000018639250",
NOTE: "fun all time"
};
const axios = require("axios");
axios
.post(
"https://harigotphat1.mekorot.co.il/ConfirmPackaotWS/OrderApprove/OrderApprove_OrderApp_Save_Approvement/" +
postData
)
.then(function(response) {
console.log("roei response======>>>>", response);
});
};
render() {
return (
<>
<View
style={{
alignItems: "flex-start",
justifyContent: "center",
borderColor: "blue",
flexDirection: "row",
justifyContent: "space-evenly"
}}
>
<TouchableOpacity onPress={() => console.log("cancel!")}>
<Avatar
size="large"
containerStyle={{ marginTop: 30 }}
activeOpacity={0.2}
rounded
source={require("../assets/down.png")}
style={{ height: 80, width: 80 }}
onPress={() => console.log("cancel!")}
/>
<View>
<Text style={{ fontSize: 25, fontWeight: "bold", color: "red" }}>
לדחות
</Text>
</View>
</TouchableOpacity>
<TouchableOpacity onPress={() => this.postData()}>
<Avatar
size="large"
activeOpacity={0.1}
rounded
source={require("../assets/up.png")}
style={{ height: 80, width: 80 }}
onPress={() => console.log("Works!")}
/>
<View>
<Text
style={{
fontSize: 25,
fontWeight: "bold",
color: "green",
marginHorizontal: 6
}}
>
לאשר
</Text>
</View>
</TouchableOpacity>
</View>
<InfoTable headerInfo={this.state.title}></InfoTable>
</>
);
}
}
Simply you can put function like this way
<TouchableOpacity onPress={() => this.postData()}> .... </TouchableOpacity>