React Native TapGestureHandler - how to call a function and send a custom id param - Magento

JoostDeVries
February 13, 2020
254 views
1 vote
2 Answers

class InfoScreen extends Component {
    constructor(props) {
        super(props);
        this.infoData =[
            {
                id:1,
                title: 'React Native',
                shortDescription: 'Wat is React Native en wat kan het voor u betekenen. Met React Native maken wij moderne apps op maat!',
                color:'green',
            },
            {
                id:2,
                title: 'Magento 2 koppeling',
                shortDescription: 'Een app met een Magento 2 koppeling is mogelijk. Link nu uw Magento 2 webshop met een moderne app!',
                color:'red',
            },
            {
                id:3,
                title: 'Koppeling met API',
                shortDescription: 'Wilt u data vanuit uw systeem in de app zien? Dit is zeker mogelijk zolang er bereik is via een API!',
                color:'blue',
            },
            {
                id:4,
                title: 'Onze waarde',
                shortDescription: 'Wat kan een React Native app voor u betekenen en hoe kunnen wij dit aan u leveren?',
                color:'orange',
            }
        ];

        for(let infoData of this.infoData){
            infoData.borderWidth = 10;
        };
        this.infoData[this.infoData.length - 1].borderWidth = 0;

        this.screenOpacity = new Value(1);

        this.onButtonClicked = event([
            {
                nativeEvent:({state})=>block([
                    cond(eq(state,State.END), set(this.screenOpacity, runTiming(new Clock(), 1, 0)))
                ])
            }
        ]);
    };
    render() { 
    return <View style={{flex:1}}>
      <Animated.View style={{opacity: this.screenOpacity}}>
        <ScrollView>
            {this.infoData.map((data) => {
              return (
                <Animated.View key={data.id} style={{...styles.InfoBlock, backgroundColor:data.color, borderBottomWidth:data.borderWidth}}>
                    <Text style={{...styles.textShadow, textAlign:'center',fontSize:30, color:'white', fontWeight:'bold', marginBottom:20}}>{data.title}</Text>
                    <Text style={{textAlign:'center',color:'white',fontSize:20, marginHorizontal: 20}}>{data.shortDescription}</Text>
                        <TapGestureHandler onHandlerStateChange={this.onButtonClicked}>
                        <Animated.View style={styles.button}>
                            <Text style={{fontSize: 15}}>Bekijk meer</Text>
                        </Animated.View>
                    </TapGestureHandler>
                </Animated.View>
              )
            })}
        </ScrollView>
      </Animated.View>
    </View>
  };  
}

How can I send my data.id to a custom function while also calling the react Animated.Event?
I have created multiple info views and each one has a button to go to the detail page for that info view. Currently, I have no idea how to do this because the onHandlerStateChange calls a react event for animating the screen in. How can I get this data.id from the TapGestureHandler to a function so that I can change the content on the detail screen appropriately?

Answers

You can achieve this using a inline callback function and which inturns call your actual function with required param.

Here It is.

<TapGestureHandler onHandlerStateChange={() => this.onButtonClicked(data.id)}>

If you need to pass the event as well, then prefer doing this

<TapGestureHandler onHandlerStateChange={(event) => this.onButtonClicked(event, data.id)}>

Also Make sure, You bind this variable properly inside the constructor function and call Animated.event instead of just event.

class InfoScreen extends Component {
    constructor(props) {
        super(props);
        this.infoData =[
            {
                id:1,
                title: 'React Native',
                shortDescription: 'Wat is React Native en wat kan het voor u betekenen. Met React Native maken wij moderne apps op maat!',
                color:'green',
            },
            {
                id:2,
                title: 'Magento 2 koppeling',
                shortDescription: 'Een app met een Magento 2 koppeling is mogelijk. Link nu uw Magento 2 webshop met een moderne app!',
                color:'red',
            },
            {
                id:3,
                title: 'Koppeling met API',
                shortDescription: 'Wilt u data vanuit uw systeem in de app zien? Dit is zeker mogelijk zolang er bereik is via een API!',
                color:'blue',
            },
            {
                id:4,
                title: 'Onze waarde',
                shortDescription: 'Wat kan een React Native app voor u betekenen en hoe kunnen wij dit aan u leveren?',
                color:'orange',
            }
        ];

        for(let infoData of this.infoData){
            infoData.borderWidth = 10;
        };
        this.infoData[this.infoData.length - 1].borderWidth = 0;

        this.screenOpacity = new Value(1);
        
        // Harding binding with this
        this.onButtonClicked = this.onButtonClicked.bind(this);
    };

    onButtonClicked(event, id) {
        console.log(event, id);
        // try calling with animated.event since the binding is implicit to InfoScreen class
        Animated.event([
            {
                nativeEvent:({state})=>block([
                    cond(eq(state,State.END), set(this.screenOpacity, runTiming(new Clock(), 1, 0)))
                ])
            }
        ])(event); // trigger the function with event passed from the function
    }


    render() { 
    return <View style={{flex:1}}>
      <Animated.View style={{opacity: this.screenOpacity}}>
        <ScrollView>
            {this.infoData.map((data) => {
              return (
                <Animated.View key={data.id} style={{...styles.InfoBlock, backgroundColor:data.color, borderBottomWidth:data.borderWidth}}>
                    <Text style={{...styles.textShadow, textAlign:'center',fontSize:30, color:'white', fontWeight:'bold', marginBottom:20}}>{data.title}</Text>
                    <Text style={{textAlign:'center',color:'white',fontSize:20, marginHorizontal: 20}}>{data.shortDescription}</Text>
                        <TapGestureHandler onHandlerStateChange={(event) =>this.onButtonClicked(event, data.id)}>
                        <Animated.View style={styles.button}>
                            <Text style={{fontSize: 15}}>Bekijk meer</Text>
                        </Animated.View>
                    </TapGestureHandler>
                </Animated.View>
              )
            })}
        </ScrollView>
      </Animated.View>
    </View>
  };  
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>

I hope this helps.

You could use Animated.call

this.onButtonClicked = event([
  {
    nativeEvent: ({ state }) =>
      block([
        cond(
          eq(state, State.END),
          set(this.screenOpacity, runTiming(new Clock(), 1, 0))
        ),
        cond(
          eq(state, State.END),
          call([], () => {
            console.log('Something here')
          })
        ),
      ]),
  },
]);

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React Native TapGestureHandler – how to call a function and send a custom id param – Magento

Answers