Develop Reference

React native : Flatlist inside scrollview

My goal is for this entire block to be scrollable.
I tried all kinds of ways to achieve the goal but without success.
I tried with ListHeaderComponent and moved the entire top view to it and it didn't work.
And I also tried <FlatList nestedScrollEnabled />
And it didn't work either.
What is the correct way to reach the scroll?
I come from here :
const renderAccordians = () => {
const items: JSX.Element[] = [];
areaData.forEach(item => {
items.push(<Accordian item={item} key={item.title} />);
});
return items;
};
To here :
return (
<View>
<View style={styles.row}>
<TouchableOpacity onPress={() => onClickFather()}>
<MaterialIcons size={24} name={data.checked ? 'check-box' : 'check-box-outline-blank'} color={'black'} />
</TouchableOpacity>
<Text style={[styles.title]}>{data.title}</Text>
<TouchableOpacity style={styles.row} onPress={() => toggleExpand()}>
<MaterialIcons name={expanded ? 'arrow-drop-up' : 'arrow-drop-down'} size={30} color={'black'} />
</TouchableOpacity>
</View>
<View style={styles.parentHr} />
{expanded && (
<FlatList
data={data.data}
numColumns={1}
scrollEnabled={false}
renderItem={({ item, index }) => (
<View>
<TouchableOpacity style={[styles.childRow, styles.button]} onPress={() => onClick(index)}>
<MaterialIcons
size={24}
name={item.checked ? 'check-box' : 'check-box-outline-blank'}
color={'black'}
/>
<Text style={[styles.itemInActive]}>{item.key}</Text>
</TouchableOpacity>
<View style={styles.childHr} />
</View>
)}
/>
)}
</View>
);

Since your FlatList will be part of an Accordion component, you "can't" embed the ExpandButton inside the Flatlist > ListHeaderComponent ... cause It'll simply hide the whole FlatList along with it's Header when you collapse your accorddion...
keyExtractor is also missing in your FlatList .. I added index as a key here which is not recommended BTW, you better use a unique field in your listItem like id...
return (
<View style={{ flex: 1}}> // <<--- Look here
<View style={styles.row}>
<TouchableOpacity onPress={() => onClickFather()}>
<MaterialIcons
size={24}
name={data.checked ? 'check-box' : 'check-box-outline-blank'}
color={'black'}
/>
</TouchableOpacity>
<Text style={[styles.title]}>{data.title}</Text>
<TouchableOpacity style={styles.row} onPress={() => toggleExpand()}>
<MaterialIcons
name={expanded ? 'arrow-drop-up' : 'arrow-drop-down'}
size={30}
color={'black'}
/>
</TouchableOpacity>
</View>
<View style={styles.parentHr} />
{expanded && (
<FlatList
data={data.data}
numColumns={1}
scrollEnabled={true} // <<--- Look here
keyExtractor={(_, index) => index.toString()} // <<=== Look here
contentContainerStyle={{flexGrow: 1}} // <<--- Look here
renderItem={({ item, index }) => (
<View>
<TouchableOpacity
style={[styles.childRow, styles.button]}
onPress={() => onClick(index)}
>
<MaterialIcons
size={24}
name={item.checked ? 'check-box' : 'check-box-outline-blank'}
color={'black'}
/>
<Text style={[styles.itemInActive]}>{item.key}</Text>
</TouchableOpacity>
<View style={styles.childHr} />
</View>
)}
/>
)}
</View>
);

If it does not work, I think you should create a component and use map datalist to render all the items and putting them into the ScrollView tag.
<ScrollView
style={styles.messageContain}
ref={ref => {
this.scrollView = ref;
}}
{data.data.map((item, index) => {
return <YourComponent key={index} data={item} />;
})}
</ScrollView>

How can conditional rendering for array map

I have condition for profile page
I want to show user profile data
name . age etc..So I map array to get each user data
but problem is when there is no data in firestore , this profile page is empty
this is really disappointed
I want to conditional rendering the following rendering
But error is
jsx expression must have one parent element
so how can render this correctly
return (
<SafeAreaView style={styles.container}>
{values.map((value)=>(
<React.Fragment key={value.id}>
<View style={styles.header}></View>
<Image style={styles.avatar} source={{uri : value.photo}}/>
<View style={styles.body}>
<View style={styles.bodyContent}>
<Text style={styles.name}>{value.displayName}</Text>
<View style={styles.label}>
<Text >My Job is - </Text>
<Text>{value.job}</Text>
</View>
<View style={styles.label}>
<Text>My Age is - </Text>
<Text >{value.age}</Text>
</View>
<View style={styles.label}>
<Text>My Gender is - </Text>
<Text >{value.gender}</Text>
</View>
<View style={styles.label}>
<Text>I want to meet - </Text>
<Text >{value.interestIn}</Text>
</View>
</View>
</View>
</React.Fragment>
))}
<View style={tw("p-10 flex-row items-center justify-between px-5")}>
<Pressable
style={
tw('p-3 rounded-xl bg-red-400')} onPress={goedit}>
<Text style={styles.text}>Edit Profile</Text>
</Pressable>
<Pressable
style={
tw('p-3 rounded bg-red-400')} onPress={logout}>
<Text style={styles.text}>LOGOUT</Text>
</Pressable>
</View>
</SafeAreaView>
)
I want to show user profile page as template even no data in firestore
can someone help me

Just add a <> ontop of the map and then </> on the bottom to close it. If you need flex then you can switch out the <></> for

You could try something like this, but paste your logic inside if statement:
const renderValues = () => {
values.map((value) => {
if (value) {
return (
<View>
<Text>data</Text>
</View>
);
} else {
return <View>no data</View>;
}
});
};
return <>{renderValues()}</>;

const renderValues = () => {
values.map((value) => {
if (value) {
return (
<React.Fragment key={value.id}>
<View style={styles.header} />
<Image style={styles.avatar} source={{ uri: value.photo }} />
<View style={styles.body}>
<View style={styles.bodyContent}>
<Text style={styles.name}>{value.displayName}</Text>
<View style={styles.label}>
<Text>My Job is - </Text>
<Text>{value.job}</Text>
</View>
<View style={styles.label}>
<Text>My Age is - </Text>
<Text>{value.age}</Text>
</View>
<View style={styles.label}>
<Text>My Gender is - </Text>
<Text>{value.gender}</Text>
</View>
<View style={styles.label}>
<Text>I want to meet - </Text>
<Text>{value.interestIn}</Text>
</View>
</View>
</View>
</React.Fragment>
);
} else {
return <View>no data</View>;
}
});
};
return (
<SafeAreaView style={styles.container}>
<>
{renderValues()}
<View style={tw('p-10 flex-row items-center justify-between px-5')}>
<Pressable style={tw('p-3 rounded-xl bg-red-400')} onPress={goedit}>
<Text style={styles.text}>Edit Profile</Text>
</Pressable>
<Pressable style={tw('p-3 rounded bg-red-400')} onPress={logout}>
<Text style={styles.text}>LOGOUT</Text>
</Pressable>
</View>
</>
</SafeAreaView>
);

Warning: Cannot update a component from inside the function body of a different component. in TouchableOpacity

I got this error
Warning: Cannot update a component from inside the function body of a different component.
How to fix this ?
When I remove touchable opacity, it's not showing anymore
<View style={styles.SaD}>
<TouchableOpacity onPress={(e) = props.locationSetState(1)}> // here
<Text style={styles.text1}>Choose your starting point</Text>
</TouchableOpacity>
<TouchableOpacity onPress={(e) = props.locationSetState(2)}>
<Text style={styles.text1}>Choose destination</Text>
</TouchableOpacity>
</View>

details are not sufficient to understand your problem but according to what I understand from your code try using react hooks and try this
function App() {
const [state,setState]=React.useState(null);
console.log(state);
return (
<View style={styles.SaD}>
<TouchableOpacity onPress={(e) => setState(1)}>
<Text style={styles.text1}>Choose destination</Text>
</TouchableOpacity>
<TouchableOpacity onPress={(e) => setState(2)}>
<Text style={styles.text1}>Choose destination</Text>
</TouchableOpacity>
</View>
);
}

Automatically scroll ScrollView in KeyboardAvoidingView when I add a new TextInput

I am working with a KeyboardAvoidingView and it's working perfectly fine except for one small issue. In the code below I have a TouchableOpacity that when clicked runs the function addName() which appends to an array and creates a new TextInput - basically when you click it, it adds a new TextInput to the ScrollView.
The KeyboardAvoidingView works perfectly fine except every time a new TextInput is added/rendered, I have to scroll down to see it. Do you know how I can make it automatically scroll to the bottom when a new TextInput is rendered?
Here is my code for the KeyboardAvoidingView:
<KeyboardAvoidingView
style={styles.container}
behavior={Platform.OS == "ios" ? "padding" : "height"}
>
<HeaderComponent
name={this.props.route.params.bill.barName + " Tab"}
navigation={this.props.navigation}
goHome={true}
goHomePrompt={true}
/>
<View
style={{
marginTop: 30,
marginLeft: 10,
}}
>
<Text
style={{ color: "white", fontSize: 18 }}
allowFontScaling={false}
>
Add people to split with...
</Text>
</View>
<ScrollView keyboardShouldPersistTaps={"handled"}>
{this.state.nameInput.map((value, index) => (
<View style={styles.nameContainer} key={index}>
<View
style={{
width: "90%",
}}
>
<TextInput
style={styles.textInputContainer}
value={value}
onChange={this.handleText(index)}
placeholder={"Enter name..."}
placeholderTextColor={"#333333"}
maxLength={50}
/>
</View>
<View
style={{
width: "10%",
}}
>
<TouchableOpacity
onPress={() => this.handleDelete(index)}
>
<Icon name="cancel" type="material" color="red" />
</TouchableOpacity>
</View>
</View>
))}
<TouchableOpacity onPress={() => this.addName()}>
<Text style={styles.addPerson}>+ Add Person</Text>
</TouchableOpacity>
</ScrollView>
<View style={styles.bottomContainer}>
<TouchableOpacity
style={styles.continueButton}
onPress={() => {
// filters through array to make sure there are no empty strings
let nameInput = this.state.nameInput.filter(
(name) => name !== ""
);
if (
nameInput.length > 1 &&
new Set(nameInput).size === nameInput.length
) {
this.setState({ nameInput, loading: false });
} else {
alert(
"Please make sure there are at least two people and no duplicate names!"
);
}
}}
>
<Text style={styles.continueButtonText} allowFontScaling={false}>
Continue to Split Tab
</Text>
</TouchableOpacity>
</View>
</KeyboardAvoidingView>
And here is my code for the addName() function:
addName = () => {
let nameInput = this.state.nameInput.concat("");
this.setState({
nameInput,
});
};

This page has the solution I was looking for: Is it possible to keep a ScrollView scrolled to the bottom?

React Native : How to call child refs from the parent's event funtion?

Have parent tag as <TouchableWithoutFeedback> and child as <Image>, trying to change the image source from the parent onPress function, but getting error. how can I archive this using refs? or any other way to resolve it?
React-native version : 0.56
Error :
Cannot read property 'favIcon' of undefined
Sample Code :
const fav = require('../../images/favorite.png');
const nonfav = require('../../images/not_favorite.png');
updateFavorite = (id) => {
this.props.refs.favIcon.source(fav);
}
render(){
return (
<View style={styles.container}>
<TouchableWithoutFeedback onPress={ this.updateFavorite.bind(this, 1) }>
<View style={ styles.imageView }>
<Image refs="favIcon" source={ nonfav } />
</View>
</TouchableWithoutFeedback>
<TouchableWithoutFeedback onPress={ this.updateFavorite.bind(this, 2) }>
<View style={ styles.imageView }>
<Image refs="favIcon" source={ nonfav } />
</View>
</TouchableWithoutFeedback>
</View>
)
}
Note : change only the child image of onPressed, not all images.

try it using nativeProps, like
import resolveAssetSource from 'resolveAssetSource';
this.refs['favIcon'].setNativeProps({
src: [resolveAssetSource(fav)]
});
refer this for more.
It might not work with react-native 0.50+ versions but according to this comment it should work with 0.57.1

Updating properties of elements in React is best done by calling setState method. Try the following
updateFavorite = (event) => {
event.target.setAttribute('src', fav)
}
render(){
return (
<View style={styles.container}>
<TouchableWithoutFeedback>
<View style={ styles.imageView }>
<img ref={ref => this.favIcon = ref} src={nonFav} onPress={ this.updateFavorite }/>
</View>
</TouchableWithoutFeedback>
<TouchableWithoutFeedback>
<View style={ styles.imageView }>
<img ref={ref => this.favIcon = ref} src={nonFav} onPress={ this.updateFavorite } />
</View>
</TouchableWithoutFeedback>
</View>
)
}