Develop Reference

Struggling with controlling state in modal react-native - data not refreshing

I'm building a basic nutrition app that shows user's info regarding items they searched.
However, when my user selects an item from the flat list, I have a modal component that pops up and shows more info regarding the item. However, when I press back on my modal and select a new item on the FlatList, the data is remaining the same from the first item I pressed :(
export default class Tracker extends React.Component {
static navigationOptions = {
title: "Tracker",
};
//storing results from the api into this local state
constructor(props) {
super(props);
this.state = {
isLoading: true,
dataSource: null,
show: false,
};
}
`
fetchData = (item) => {
console.log(item);
fetch(
`https://api.edamam.com/api/food-database/parser?
ingr=${item}&app_id=${APP_ID}&app_key=${APP_KEY}`
)
.then((response) => response.json())
.then((responseJson) => {
console.log(responseJson);
// console.log(responseJson.hints[1].food.nutrients);
this.setState({
// passing in all the hints info into itemArray, which contains all the info regarding
the items
itemArray: responseJson.hints,
});
})
.catch((error) => {
console.log(error);
});
// dimisses keyboard if they press the button on the screen
Keyboard.dismiss();
};
<Button
title="Search"
onPress={() => this.fetchData(this.state.item)}
/>``
<View style={styles.ViewFilterContainer}>
<TouchableOpacity style={styles.ViewFilterContainer}>
<View style={styles.filterButtonView}>
<Text style={styles.filterText}> Filter </Text>
</View>
</TouchableOpacity>
</View>
<View style={styles.paddingForResultsContainer}>
<FlatList
style={styles.resultsBackground}
data={this.state.itemArray}
renderItem={({ item, index }) => (
<TouchableOpacity
onPress={() => this.setState({
show: true
})} //() => navigate("foodInfo")
>
<View style={styles.resultsContainer}>
<View style={styles.textView}>
<Text style={styles.resultsText}>
{item.food.label}
{item.food.brand}
</Text>
</View>
<View style={styles.nutritionResultsText}>
<Text style={styles.resultsTextSubInfo}>
F: {Math.round(item.food.nutrients.FAT)}
</Text>
<Text style={styles.resultsTextSubInfo}>
C: {Math.round(item.food.nutrients.CHOCDF)}
</Text>
<Text style={styles.resultsTextSubInfo}>
P: {Math.round(item.food.nutrients.PROCNT)}
</Text>
<Text style={styles.resultsTextSubInfo}>
K/Cal: {Math.round(item.food.nutrients.ENERC_KCAL)}
</Text>
</View>
</View>
<Modal transparent={true} visible={this.state.show}>
<View style={styles.modalView}>
<View>
<Text>{item.food.brand}</Text>
</View>
<Button title="Back" onPress={() => this.setState({show:false})}/>
</View>
</Modal>
</TouchableOpacity>
)}
/>
</View>

Updating informations from modal-React native

On my react native app I display information that I fetched from the server this way:
So when I click update profil, I display a modal with text input on it in order to give the user the opportunity to change the information of his profile. The modal look like this:
Now I already created a Fetch Post function that, when I click on the button update it sends static information to the server and the modal closes. but the profile page doesn't refresh until I get out of it and come back.
My question is: whats the best way to get the values from the textinputs, send them through post. and refresh the screen after the modal closes?. Should i use formik?
Here is a look at my code:
export default function MprofilScreen({ navigation }) {
const [modalVisible, setModalVisible] = useState(false);
const [Data, setData] = useState([]);
useEffect(() => {
fetch('******')
.then((response) => response.json())
.then((res) => {
console.log("repooooonse")
console.log(res)
setData(res)
})
.done();
}, []);
return (
<View style={{ flex: 1, backgroundColor: 'white' }} >
<Modal
animationType="slide"
transparent={true}
visible={modalVisible}
onRequestClose={() => {
Alert.alert("Modal has been closed.");
}}>
<View style={styles.modalView}>
<TouchableOpacity
style={{ ...styles.openButton, backgroundColor: "#2196F3" }}
onPress={() => {
setModalVisible(!modalVisible);
}}
>
<Text style={styles.textStyle}>close</Text>
</TouchableOpacity>
<ScrollView>
<Text style={styles.text}>Nom:</Text>
<TextInput style={styles.text_input} placeholder="nom" />
....
<Text style={styles.text}>Ville :</Text>
<TextInput style={styles.text_input} placeholder="Ville " />
<TouchableOpacity
style={{ ...styles.openButton, backgroundColor: "#2196F3" }}
onPress={() => {
setModalVisible(!modalVisible);
}}
>
<Text style={styles.textStyle}>Delete</Text>
</TouchableOpacity>
</ScrollView>
</View>
</Modal>
<TouchableOpacity style={styles.btn}
onPress={() => {
setModalVisible(true);
}}>
<Text style={{ color: 'white', fontSize: 15 }}> Update profil</Text>
</TouchableOpacity>
<View >
<View style={styles.main_container}>
<Text style={styles.text}>Nom:</Text>
<Text style={styles.text1}>{Data.nom}</Text>
</View>
.....
<View style={styles.main_container}>
<Text style={styles.text}>Ville:</Text>
<Text style={styles.text1}> {Data.ville}</Text>
</View>
</View>
</View>
);
}
I'm new to react native and I'll appreciate your help!

I'll assume you have the fetching details in componentDidMount of that profile page, and since modal also resides in it, so page doesnt refresh. What you can do is call that function again on modalClose.
suppose you have,
getDetails = () => {
.... fetch details
}
and in componentDidMount you call like :
componentDidmount(){
this.getDetails();
}
So same you can call on modalClose the same function after updating it.
onModalClose = () => {
this.getDetails()
}
hope its clear.feel free for doubtys

Show Loader when a button is clicked

I'm trying to obtain a loader when a button is clicked (for a signup) without create another page (only to show the loader).
How can I do??
This is my code and what I tried (but it doesn't appears)
class Signup extends Component {
constructor(props) {
super(props);
this.state = {
//code about signup
isLoading: false
};
}
showLoader = () =>{
this.setState({ isLoading: true})
this.registrazione()
}
registrazione() {
//code about signup
}
render() {
return (
<View style={style.container}>
//code about signup
<View style={style.footer}>
<TouchableOpacity
style={[style.button, style.buttonOK]}
onPress={() => this.showLoader()}
>
<Text style={[style.buttonTesto]}>Signup</Text>
</TouchableOpacity>
<ActivityIndicator animating={this.state.isLoading} size="large" color="#56cbbe" />
</View>
</KeyboardAwareScrollView>
</View>
</View>
);
}
}

First of all you have one closing View tag that is not needed.
Assuming that's just mistake in question, you could do it with JS ternary operator. Like this:
<View style={style.container}>
//code about signup
<View style={style.footer}>
{(!this.state.isLoading) ? <TouchableOpacity
style={[style.button, style.buttonOK]}
onPress={() => this.showLoader()}
>
<Text style={[style.buttonTesto]}>Signup</Text>
</TouchableOpacity> : <ActivityIndicator animating={this.state.isLoading} size="large" color="#56cbbe" />}
</View>
</KeyboardAwareScrollView>
</View>
You can learn more about ternary operators here
This should replace your button with loading animation.
Don't hesitate to ask any more questions if you have any! I'm glad to help!

How to get user id from firebase in react native?

I need your help I'm using firebase for my app. I'm trying to get the users ID not the logged users no all users I have. I want to show their (uid) simply like in an alert for each user. Also, I'm showing them in a flatlist and when I set item.uid in an alert it shows (undefined). But, all the other data of the user is shown correctly. This what I did until now:
**
users.js
**
export default class usersList extends React.Component{
state = {
loading: false,
uid: '',
users: [],
items: []
};
componentDidMount() {
let itemsRef = f.database().ref('users').once('value').then(snapshot => {
var data = snapshot.val();
var items = Object.values(data);
this.setState({items});
console.log(snapshot.val())
});
}
renderItem({item}) {
return (
<View key={index} style={{width: '100%', overflow:'hidden', marginBottom: 5, justifyContent:'space-between', borderBottomWidth:1, borderColor: 'grey'}}>
<View>
<View style={{padding:5, width:'100%', flexDirection: 'row', justifyContent: 'space-between'}}>
<Text>{item.email}</Text>
</View>
</View>
</View>
)
}
render() {
return (
<View style={styles.container}>
<ScrollView>
{
this.state.items.length > 0
? <ItemComponent items={this.state.items} navigation={this.props.navigation} />
: <Text>No stores</Text>
}
</ScrollView>
</View>
);
}
}
//ItemComponent.js
export default class ItemComponent extends Component {
static propTypes = {
items: PropTypes.array.isRequired
};
render() {
return (
<View style={styles.itemsList}>
{this.props.items.map((item, index) => {
return (
<View key={index}>
<TouchableOpacity
onPress={ () => alert(item.uid)}>
<Text style={styles.itemtext}>{item.email}</Text>
</TouchableOpacity>
</View>
)
})}
</View>
);
}
}

firebase.database().ref('user').on('value', (datasnapshot) => {
this.setState({
_id: datasnapshot.key
});`

This solution worked for me
<Text style={styles.yourStyleHere}>UID: {auth.currentUser?.uid} </Text>

How to avoid jsx styling error in react native?

Whenever I tried to build UI from scratch I'm getting this error adjacent jsx element must be wrapped in an enclosing tag. I don't know how to solve this. Because I tried different methods, I've tried to put the blocks within View component withflex:1 but non-use. Is there any proper solution for this. This is becoming a great challenge for me because I can't design any components of my own. What to do please help me. Following is my code.
screen.js
export default class FirstScreen extends Component {
constructor(props){
super(props);
this.state = {
showPopupDialog: false,
workType: "",
workers: []
}
}
componentWillMount(){
fetch('http://192.168.1.6:3000/api/worker', {
method:'GET',
headers:{
Accept: 'application/json'
}
})
.then(response => response.json())
.then(responseData =>
this.setState({
workers:responseData
})
)
}
onPressYes = (workType) => {
console.log(workType);
}
popupDialog = (id, workType) => {
this.setState ({
showPopupDialog: true,
workType: workType
});
//make sure you set showPopupDialog to false and workType to "" when you click yes or no button in PopupDialog component so that it will work the next time you click on card
}
render() {
const { workers, workType, showPopupDialog} = this.state;
return (
<View style={{flex:1}}>
<Header />
<ScrollView>
{workers.map((a, index)=> (
<View style={{flex:1}}>
<CardSection>
<TouchableOpacity onPress={() => this.popupDialog(a.id, a.work_type)}>
<View style={{ maringTop: 10, marginLeft:120}}>
<Image style={{ height: 100, width: 100 }} source={{ uri: a.work_type == 'Carpenter' ? images[0].image : images[1].image}}/>
<Text style={{marginLeft:20, fontSize:20}}>{a.work_type}</Text>
</View>
</TouchableOpacity>
</CardSection>
</View>
))}
{showPopupDialog && <PopupDialog
dialogStyle={{ backgroundColor: "#FFFFFF", height: 180, width:300, borderWidth:1,padding:10}}
overlayBackgroundColor="#fff" dismissOnTouchOutside={true}>
<View style={styles.dialogContentView}>
<Text style={{fontSize:18, margingTop:10,color:"#000000"}}>Are you sure you want to submit?</Text>
<View style={{flexDirection:'row'}}>
<View style={styles.button_1}>
<Button title="Yes" color="#FF6633" onPress={() => this.onPressYes(workType)}/>
</View>
<View style={styles.button_1}>
<Button title="No" color="#FF6633" onPress={() =>this._onPressNo() }/>
</View>
</View>
</View>
</PopupDialog>}
</ScrollView>
</View>
);
}
}
The issue I'm facing is I can't place the <PopupDialog> component adjacent to <CardSection> , in order to that I put the <PopupDialog> within <View> ,even though it doesn't solve my issue.Please help..Please

Give a try with below corrected code.
There are two things that needs be corrected
You are doing .map but you are not returning anything which I have
corrected in the code below
export default class FirstScreen extends Component {
constructor(props){
super(props);
this.state = {
workType: "",
workers: []
}
}
componentWillMount(){
fetch('http://192.168.1.6:3000/api/worker', {
method:'GET',
headers:{
Accept: 'application/json'
}
})
.then(response => response.json())
.then(responseData =>
this.setState({
workers:responseData
})
)
}
onPressYes = (workType) => {
console.log(workType);
}
popUpDialog = (id, workType) => {
this.setState ({
workType: workType
});
this.popupDialog.show();
//make sure you set workType to "" when you click yes or no button in PopupDialog component so that it will work the next time you click on card
}
render() {
const { workers, workType} = this.state;
return (
<View style={{flex:1}}>
<Header />
<ScrollView>
{workers.map((a, index)=> (
<View style={{flex:1}}>
<CardSection>
<TouchableOpacity onPress={() => this.popUpDialog(a.id, a.work_type)}>
<View style={{ maringTop: 10, marginLeft:120}}>
<Image style={{ height: 100, width: 100 }} source={{ uri: a.work_type == 'Carpenter' ? images[0].image : images[1].image}}/>
<Text style={{marginLeft:20, fontSize:20}}>{a.work_type}</Text>
</View>
</TouchableOpacity>
</CardSection>
</View>
))}
<PopupDialog ref={popupDialog => {
this.popupDialog = popupDialog;
}}
dialogStyle={{ backgroundColor: "#FFFFFF", height: 180, width:300, borderWidth:1,padding:10}}
overlayBackgroundColor="#fff" dismissOnTouchOutside={true}>
<View style={styles.dialogContentView}>
<Text style={{fontSize:18, margingTop:10,color:"#000000"}}>Are you sure you want to submit?</Text>
<View style={{flexDirection:'row'}}>
<View style={styles.button_1}>
<Button title="Yes" color="#FF6633" onPress={() => this.onPressYes(workType)}/>
</View>
<View style={styles.button_1}>
<Button title="No" color="#FF6633" onPress={() =>this._onPressNo() }/>
</View>
</View>
</View>
</PopupDialog>
</ScrollView>
</View>
);
}
}

If I understand your question correctly...
You can return multiple root elements in jsx by wrapping is in a <React.Fragment> element (you can use <> and </> in v16.2 and later). Fragments are new in React v16. Prior to that, you just have to wrap them in some element (a div or span, usually).

The problem is that you have this structure:
<a>
{this.state.workers.map((a, index)=>
<b/>
<c/>
)}
</a>
Since <b/><c/> is parsed separately and there's no enclosing element, you're getting the error. But an enclosing element isn't necessary for the final structure, which does have an enclosing element. The solution is to simply return an array of JSX elements, like this:
<a>
{this.state.workers.map((a, index)=>
[<b/>,
<c/>]
)}
</a>