We Keep Coding

How to call multiple screens on one page in React Native

I have made a Home page in which there are three buttons in the header (like a tab navigator) I want something like on clicking each button a screen appears beneath the header, as shown in the image below:
Here's what I have tried:
constructor(props) {
super(props);
this.state = {
initialstate: 0, //Setting initial state for screens
};
}
render(){
return(
<View style={styles.container}>
<TouchableOpacity onPress={() => this.setState({ initialstate: 0})}>
<Image source={require('../../assets/add.png')}
resizeMode="contain"/>
</TouchableOpacity>
<TouchableOpacity onPress={() => this.setState({ cardstate: 1})}>
<Image source={require('../../assets/request.png')}
resizeMode="contain"/>
</TouchableOpacity>
<TouchableOpacity onPress={() => this.setState({ cardstate: 2})}>
<Image source={require('../../assets/send.png')}
resizeMode="contain"/>
</TouchableOpacity>
{this.state.initialstate == 0 ? ( <RequestComp/> ) : ( <TopUpComp/> ) }
//Over Here when I use the Third Screen like " : <SendComp/> " it gives me JSX error says "EXPECTED }"
</View>

Ciao, what you need seems more like a popup that appears from the bottom of the screen. I use react-native-popup-ui Toast component to do that.
Something like:
import { Root, Toast } from 'popup-ui'
...
<Root>
<View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
<TouchableOpacity
onPress={() =>
Toast.show({
title: 'User created',
text: 'Your user was successfully created, use the app now.',
color: '#2ecc71'
})
}
>
<Text>Call Toast</Text>
</TouchableOpacity>
</View>
</Root>
And the result is:
Note: I have android and the Taost is overlapped by android navigation bar but on iOS you should see all the Toast component

you are using a ternary operator ( initial ? true : false ) which can work only for two components in your case.

React-Native render a Card Component using FlatList not working

I'm new to React-Native I want to render the Card Component with different json data from an external file. My problem which i don't see is that the card component image is not showing and the card components are not stacking on top of each other. This is what i have so far. The card Component is being rendered through it's parent component which is Recipie.
Below is the Parent Component Recipie
import RecipieData from '../Data/Data'
const Recipies = () => {
return (
<View style={styles.background}>
<View style={styles.cards}>
<FlatList
style={{height: '100%'},{width:"100%"}}
data={RecipieData}
keyExtractor={item => item.id}
renderItem={({ item }) =>
<Card
image={item.photo}
title={item.name}
time={item.time}
/>
}
/>
</View>
</View>
)
}
export default Recipies
const styles = StyleSheet.create({
background:{
backgroundColor:'#F2F2F2',
height: "100%",
flex: 1,
},
cards:{
marginHorizontal:20,
marginVertical:30,
}
})
`
Here is the Child Component Card
const Card = (props) => {
return (
<View style={styles.card}>
<LikeButton/>
<Image style={styles.image} source={{uri: props.image}}/>
<Text style={styles.title}>{props.title}</Text>
<Text style={styles.time}>{props.time}</Text>
</View>
)
}
export default Card
const styles = StyleSheet.create({
card:{
marginVertical:15,
width:'100%',
borderRadius:35,
backgroundColor:'black',
},
image:{
marginLeft:0,
padding:0,
width:'100%',
height:'100%',
borderRadius:30,
position:'relative',
opacity:0.65
},
title:{
position:'absolute',
marginTop:65,
marginBottom:0,
marginHorizontal:20,
fontSize: 30,
color:'white',
fontWeight:'bold'
}, time:{
width:'20%',
textAlign:'center',
marginVertical: 20,
position:'absolute',
backgroundColor: Colors.green,
color:'white',
fontSize: 25,
fontWeight:'bold',
bottom:0,
borderRadius:20,
marginLeft: 20
}
})
I've tried everything . I'm really trying to get the card components stacked in a column view with the props from the external json file called RecipieData. Please can someone help me it will be much appreciated!!!!

you can try this cards:{ marginHorizontal:20, marginVertical:30, flex : 1 }

renderItem should return a component.Use this
renderItem={({ item }) =>
return(<Card
image={item.photo}
title={item.name}
time={item.time}
/>)}

Show Empty list message only after Loader get ended in React Native using Flat list

I have a flat list, which gets its data source as a state. Actually, this data is from firebase, and i have been using redux. So, the data is fetched in the actions, and using callback i get the data to state.
What i want to achieve is, when there is no data found from the api, An empty list message should be show in the view. Actually , i achieved this using "ListEmptyComponent". But whats happening is the screen starts with empty message, and the spinner loads below it, and then if data found the message goes away as well as spinner.
But, what i wanted is, when the view gets rendered the first thing everyone should see is the spinner, and then if data empty spinner hides then empty list message displays.
How to achieve this ?
My Action :
export const fetchOrderHistory = (phone, callback) => {
return (dispatch) => {
dispatch({ type: START_SPINNER_ACTION_FOR_ORDER_HISTORY })
firebase.database().ref('orders/'+phone)
.on('value', snapshot => {
const snapShotValue = snapshot.val();
callback(snapShotValue);
dispatch ({ type: ORDER_HISTORY_FETCHED , payload: snapshot.val()});
dispatch({ type: STOP_SPINNER_ACTION_FRO_ORDER_HISTORY })
});
};
};
My Flat List & spinner:
<FlatList
data={this.state.historyOfOrders}
keyExtractor={item => item.uid}
ListEmptyComponent={this.onListEmpty()}
renderItem={({ item }) => (
<Card
containerStyle={{ borderRadius: 5 }}
>
<View style={styles.topContainerStyle}>
<View>
<TouchableOpacity
onPress={() => this.props.navigation.navigate('ViewOrderScreen', {itemsOfOrder: item}) }
>
<View style={styles.viewOrderContainer}>
<View style={styles.viewOrderTextContainer}>
<Text style={styles.viewOrderTextStyle}>View Order</Text>
</View>
<Icon
name='ios-arrow-forward'
type='ionicon'
color='#ff7675'
/>
</View>
</TouchableOpacity>
</View>
</View>
</View>
</Card>
)}
/>
{this.props.isSpinnerLoading &&
<View style={styles.loading}>
<ActivityIndicator size="large" color="#03A9F4"/>
</View> }
My Call back at componentWillMount which set state:
componentWillMount() {
this.props.fetchOrderHistory((this.props.phone), (snapShotValue)=> {
const userOrderHistory = _.map(snapShotValue, (val,uid) => ({uid, ...val}))
this.setState({ historyOfOrders: userOrderHistory })
});
}
My EmptyList Message:
onListEmpty = () => {
return <View style={{ alignSelf: 'center' }}>
<Text style={{ fontWeight: 'bold', fontSize: 25 }}>No Data</Text>
</View>
}
My State:
state = { historyOfOrders: "" }
I am getting the spinner values from the reducers, using mapStateToProps.
Kindly Guide me, through

you have to do two things for that.
First, show Flatlist only if the loader is stopped. Second, set default value of this.state.historyOfOrders is null and check if this.state.historyOfOrders not null then only show Flatlist.
Here is a code:
{(!this.props.isSpinnerLoading && this.state.historyOfOrders != null) ?
(
<FlatList
data={this.state.historyOfOrders}
keyExtractor={item => item.uid}
ListEmptyComponent={this.onListEmpty()}
renderItem={({ item }) => (
<Card containerStyle={{ borderRadius: 5 }}>
<View style={styles.topContainerStyle}>
<View>
<TouchableOpacity onPress={() => this.props.navigation.navigate('ViewOrderScreen', {itemsOfOrder: item}) }>
<View style={styles.viewOrderContainer}>
<View style={styles.viewOrderTextContainer}>
<Text style={styles.viewOrderTextStyle}>View Order</Text>
</View>
<Icon
name='ios-arrow-forward'
type='ionicon'
color='#ff7675'
/>
</View>
</TouchableOpacity>
</View>
</View>
</Card>
)}
/>
) : null
}
With this condition, even if you want loader above Flatlist you can do that.

The path you should take is rendering only the spinner when the loading flag is set and rendering the list when loading flag is false.
Your render method should be like below
render()
{
if(this.props.isSpinnerLoading)
{
return (<View style={styles.loading}>
<ActivityIndicator size="large" color="#03A9F4"/>
</View> );
}
return (/** Actual List code here **/);
}

Pass, Receive, and Use function into child Component

I'm still learning ReactJS / React Native and I'm stuck with a stupid thing I'm sure. Here's my case: I want to receive data in my child component and display it in a Modal. So:
I have a function like this (axios, API, ...):
getProductInfo = (product_id) => {
axios.get(
`API-EXAMPLE`
)
.then((response) => {
this.setState({
isVisible: false,
productInfo: response.data
})
console.log(this.state.productInfo);
})
}
I pass the function to my Child Component with the "onModalPress":
<CatalogList productsList={this.state.displayProducts} onModalPress={this.getProductInfo}/>
And here, some info about the Child Component:
const CatalogList = ({productsList, onModalPress}) => (
<Card containerStyle={styles.container}>
<View style={{ padding:20, margin:0, flexDirection: 'row', flexWrap: 'wrap', flex: 1, justifyContent: 'space-between' }}>
{
productsList.map((p, i) => {
return (
<TouchableHighlight key={i} onPress={() => onModalPress(p.id)}>
<View style={style.card}>
<View style={style.content}>
<View style={{width: 170, zIndex: 2}}>
<Text style={style.name}>{p.id}</Text>
<Text style={style.name}>{p.name}</Text>
<Text style={style.winemaker}>Domaine : {p.domain}</Text>
<Text style={style.winemaker}>Origine : {p.wine_origin}</Text>
<Text style={style.aop}>Appellation : {p.appellation}</Text>
</View>
<Image
style={style.image}
source={{ uri: p.image, width: 140, height: 225, }}
/>
</View>
<View style={style.entitled}>
<Text style={[style.priceText, style.cadetGrey]}>{p.publicPriceText}</Text>
<Text style={style.priceText}>{p.subscriberPriceText}</Text>
</View>
<View style={style.row}>
<Text style={[style.price, style.cadetGrey]}>{p.price} €</Text>
<Text style={style.price}>{p.subscriber_price} €</Text>
</View>
<View style={[{backgroundColor: p.label_colour}, style.label]}>
<Text style={style.labelText}>{p.label}</Text>
</View>
<Modal isVisible={false}>
<View style={{ flex: 1 }}>
{/* <Text>{productInfo.rewiew_wine_waiter}</Text> */}
</View>
</Modal>
</View>
</TouchableHighlight>
);
})
}
</View>
</Card>
);
The "p.id" comes from another data (productList) that I get with another Axios API Call. With "p.id" I get the product_id I need in my function
getProductInfo
Everything works and I display the info inside my console.log (this.state.productInfo).
My issue and I think is easy... It's how can I "store/stock" this info I have in the console.log in a const/props to use it in my Modal and call it like in this example:
<Modal isVisible={false}>
<View style={{ flex: 1 }}>
<Text>{productInfo.rewiew_wine_waiter}</Text>
</View>
</Modal>
Of course, any other advice is welcome!

React is all about one-way data flow down the component hierarchy
Let's assume that you have a Container component that fetch all the data:
class MyContainer extends Component{
state = {
myItensToDisplay: []
}
componentDidMount(){
//axios request
.then(res => this.setState({myItensToDisplay: res.itens}))
}
}
Looking good! Now you have all the data you want to display fetched and stored in your container's state. Let's pass it to a Itemcomponent:
class MyContainer extends Component{
// All the code from above
render(){
const itens = this.state.myDataToDisplay.map( item =>{
return(<Item name={item.name} price={item.price} />);
})
return(
<div>
{itens}
</div>
)
}
}
Now you are fetching all the data you want to display in a parent component and distributing that data to it's childrens via props.

Rendering Child Component in React Native

I am using React Native and React Navigation to build a simple app.
I have got the basic structure working with stub state but I am having problem with changing state via callback and re-render.
In my screen, I have simple start button
`<View style={styles.buttonContainer}>
<TouchableOpacity
style={[myStyles.buttonStyle, { backgroundColor: color }]}
onPress={() => handlePress(button.title)}
>
<Text style={myStyles.textStyle}>{button.title}</Text>
</TouchableOpacity>
</View>`
Problem:
After I update my parent Component state, my child component does not instantly render to match the state change. I understood React will re-render all child components when parent state is changed?
Instead, I have to move back to previous screen and navigate again to my button screen to see that the button's color and text has changed correctly.
I've read about requiring a componentWillReceiveProps(nextProps) handler but I am not sure how to use it. I put a console.log('nextProps', nextProps) inside but it does not get fired.
From navigation perspective, the Root component is on index[0] and my button view is at index[3] so it's the 3rd screen from the root.
EDIT 1: Added Code
myButton screen:
export class TeamsScreen extends React.Component {
static navigationOptions = ({ navigation }) => ({
title: `${navigation.state.params.game.name}: Select Team`,
headerTintColor: 'white',
headerStyle: {
backgroundColor: 'black',
},
headerVisible: true
})
componentWillReceiveProps(nextProps) {
console.log('nextProps', nextProps);
}
render() {
const { navigate, setParams } = this.props.navigation;
const { game, player, setGameState } = this.props.navigation.state.params;
const color = game.status === 'Start' ? 'green' : 'red';
const index = game.indexOf(player);
const status = game.status;
console.log('index', index);
console.log('status', status);
return (
<View style={styles.container}>
<View style={styles.buttonContainer}>
<TouchableOpacity
style={[myStyles.buttonStyle, { backgroundColor: color }]}
onPress={() => setGameState(index, status)}
>
<Text style={myStyles.textStyle}>{game.status}</Text>
</TouchableOpacity>
</View>
<View style={styles.buttonContainer}>
<Button
onPress={() => navigate('ChangeDriverScreen', { team, game })}
title='Change Driver'
/>
</View>
<View style={{ marginTop: 40, marginBottom: 20 }}>
<Text style={{ fontSize: 16, color: 'white', alignSelf: 'center' }}>Teams</Text>
</View>
<View style={{ height: 250 }}>
<FlatList
data={player.teams}
renderItem={({item}) =>
<View style={styles.buttonContainer}>
<Button
onPress={() => navigate('TeamSelectedStartScreen', { team: item })}
title={item.name}
/>
</View>}
keyExtractor={item => item.name}
/>
</View>
<Image
style={{ alignSelf: 'center', justifyContent: 'flex-end', height: 75, width: 250, resizeMode: 'stretch'}}
source={require('./images/icons/playerPlaceholder.png')}
/>
</View>
)}}
Then the onPress function that is called back:
setGameState = (gameIndex, status) => {
console.log('setGameState', gameIndex, status);
console.log('gameStateBefore', this.state.game);
const newGameState = this.state.game.map(t => {
console.log(this.state.game.indexOf(t));
if (this.state.game.indexOf(t) === gameIndex) {
const newStatus = status === 'Start' ? 'Stop' : 'Start';
t.status = newStatus; /*eslint no-param-reassign: "off"*/
console.log('inside if', t.status);
console.log('inside if game', t);
return t;
}
return t;
});
console.log('new Game State', newGameState);
this.setState(() => ({
game: newGameState
}));
}
So the setState method works (as re-navigating back to screen 3 shows the correct state but core question is how to get immediate re-render of screen 3 when setState is called from Screen 0.