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Jay Vijay Modi
Jay Vijay Modi

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Using useState to edit the style of a Component in React Native

I am new to using state management and was finding difficulty editing styles of a component using useState. Currently I have a swiper component that holds my main images and below that I have a thumbnail gallery for each of those images with a borderWidth:1. What I want is that only the border for the current slide should be active while the others show no borderWidth. Currently my display looks like this where all the thumbnails have a border:

export default function App() { 

    const [activeBorder, setActiveBorder] = useState();
      const [activeIndex, setActiveIndex] = useState();
      const fishMapping = ["Fish Azure", "Fish Salmon", "Fish Another"];
      const onIndexChanged = (index) => setActiveIndex(index);

      return (
        <View style={{ flex: 1 }}>
          <ImageBackground
            style={globalStyles.backgroundImage}
            source={require('./resource/images/bg1080.jpeg')}
          >
          <Fish onIndexChanged={onIndexChanged}/>
          <BottomImages />
          { activeIndex && <Text>`Fish` ${fishMapping[activeIndex]}</Text> }
          </ImageBackground>
        </View>
      );
    }
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And for the thumbnails below this is my code:
BottomImages.js:

export default class BottomImages extends Component { 

    state = {
        columns: 3,
      };

      render() {
        const { columns } = this.state;
        return (
          <View style={styles.container}>
            <FlatList
              numColumns={columns}
              data={[
                require('../resource/images/AzureDamsel.png'),
                require('../resource/images/BicolourAngelfish.png'),
                require('../resource/images/ClownTriggerfish.png'),
              ]}
              renderItem={({ item }) => {
                return (
                  <ListItem
                    itemWidth={(ITEM_WIDTH - 10 * columns) / columns}
                    image={item}
                  />
                );
              }}
              keyExtractor={(index) => {
                return index;
              }}
            />
          </View>
        );
      }
    }
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ListItem.js which holds my thumbnail images as well as the borderbox for the images:

const ListItem = (props) => {  

      const { itemWidth } = props;

      return (
        <TouchableWithoutFeedback>
          <Animated.View
            style={{
              margin: 5,
            }}>
            <Image
              style={{
                width: itemWidth,
                height: 50,
                borderWidth: 1,
                borderColor: '#000',
              }}
              source={props.image}></Image>
          </Animated.View>
        </TouchableWithoutFeedback>
      );
    };
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Here's a link to the snack just in case: Sandbox

Discussion (4)

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rbayuokt profile image
Rizky Bayu Oktavian

do you need my help ? just contact me, dont worry I'll help you

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jayvijaymodi1 profile image
Jay Vijay Modi Author

Hey how can I contact you. Can you give me your email please

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rbayuokt profile image
Rizky Bayu Oktavian

It's on my github @rbayuokt

Thread Thread
jayvijaymodi1 profile image
Jay Vijay Modi Author

Hey Rizky, I tried to reach out but it didn't seem to work. I have a doubt regarding React Parallax at the moment if you could kindly help me out with:
stackoverflow.com/questions/688737...