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React Native Firebase - Push data to Array allowing to display in a FlatList


By : L.Zoe
Date : September 16 2020, 08:00 AM
With these it helps 1st thing, you have mechanics object in state so you need to access it like
code :
console.log(this.state.mechanics)
let mechanicsTemp = [];
snapshot.forEach(function (childSnapshot) {
    // key will be the auth ID for each user
    var key = childSnapshot.key;
    var mechanicName = snapshot.child(key + '/name').val();
    mechanicsTemp.push({_name: mechanicName, _key: key});
});

this.setState({ mechanics:mechanicsTemp })


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Display Flatlist Array for React Native


By : umesh
Date : March 29 2020, 07:55 AM
I hope this helps you . Your problem is more of filtering the array to find a specific object. So here's my approach- First find the required cluster in your Cluster array. I am assuming that it exists. Necessary error handling can be done.
code :
const getClusterByName = (name) => 
    Cluster.find(cluster => cluster.hasOwnProperty(name))[name]
<FlatList
    data={getClusterByName('cluster1')}
    ...
/>

How to display data using FlatList in react native?


By : Joe Sysel
Date : March 29 2020, 07:55 AM
this will help renderItem accepts a function which takes the current list item as an argument and renders a component. You can think of it as the "map" function like in listItems.map(item => .
I'd recommend you create a presentational "card" component to encapsulate the view rendering logic (e.g. MarketingUpdateCard) and just pass the list item data as props:
code :
renderItem={({ item }) => (
  <MarketingUpdateCard {...item} />
)}
// MarketingUpdateCard.js
const MarketingUpdateCard = ({ project_name, title, description, image }) => (
    <View>
      // your current card template here
    </View>
)

React-Native Firebase Display array of objects using FlatList


By : user2769273
Date : March 29 2020, 07:55 AM
wish help you to fix your issue The reason is that .on('child_added') returns a single object for each item in the groups node.
In your case you need to use .once('value'), which will return you a collection (object) with the items, that you have to convert into an array:
code :
firebase.database().ref('/groups').once('value', function(snapshot) {
    var returnArray = [];

    snapshot.forEach(function(snap) {
        var item = snap.val();
        item.key = snap.key;

        returnArray.push(item);
    });

    // this.setState({ dataArray: returnArray })
    return returnArray;  
});

How to display data using array in flatlist react-native


By : user3610317
Date : March 29 2020, 07:55 AM
I wish did fix the issue. How to display data using array in flatlist in react-native. , Try this its a dummy example you can use your own :
code :
import React from 'react';
import { SafeAreaView, View, FlatList, StyleSheet, Text } from 'react-native';
import Constants from 'expo-constants';

const DATA = [
  {
    id: 'bd7acbea-c1b1-46c2-aed5-3ad53abb28ba',
    title: 'First Item',
  },
  {
    id: '3ac68afc-c605-48d3-a4f8-fbd91aa97f63',
    title: 'Second Item',
  },
  {
    id: '58694a0f-3da1-471f-bd96-145571e29d72',
    title: 'Third Item',
  },
];

function Item({ title }) {
  return (
    <View style={styles.item}>
      <Text style={styles.title}>{title}</Text>
      <Text>Button</Text>
    </View>
  );
}

export default function App() {
  return (
    <SafeAreaView style={styles.container}>
      <FlatList
        data={DATA}
        renderItem={({ item }) => <Item title={item.title} />}
        keyExtractor={item => item.id}
      />
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    marginTop: Constants.statusBarHeight,
  },
  item: {
    backgroundColor: '#f9c2ff',
    padding: 20,
    marginVertical: 8,
    marginHorizontal: 16,
    flexDirection:'row'
  },
  title: {
    fontSize: 32,
  },
});

React Native FlatList component data constantly refreshing after firebase data call without consistent display of Fireba


By : user3656965
Date : March 29 2020, 07:55 AM
Any of those help In my experience, FlatList performs better if you put a setTimeout in the function that's called by onEndReached. I have experienced FlatLists constantly refreshing because it hasn't finished loading more data before onEndReached gets called again. FlatList is supposed to have something built in that prevents this being an issue, but it doesn't always work.
Using bounces={false} in FlatList can also help with this, since sometimes a bounce will cause onEndReached to be triggered twice in a row before the FlatList has finished updating.
code :
gettingData(){

   this.setState({refreshing: true, showFooter: true});

       this.GetMyData().then(() => {
       this.setState({refreshing: false, showFooter: false, loading: false});
   });

     }


 waitingForData(){

   setTimeout(() => {
     if(this.state.showFooter === false && this.state.listData.length > 0){
       //console.log('getting after waiting');
       this.gettingData();
     }else{
       //console.log('waiting again');
       this.waitingForData();
     }
   }, 15000)

 }

_onEndList = () => {

  if(this.state.showFooter === false && this.state.listData.length > 0){
    //console.log('getting');
    this.gettingData();


  }else{
//console.log('waiting');
    this.waitingForData();
  }

}
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