CODEWITHSUNDEEP
javascriptreact-nativereact-native-ios
vishal dharankar
vishal dharankar

Reputation: 7746

How to pass a function to a component as a property in React Native

I have created a JS function which returns a view with some subcomponent and I am reusing the code.I want to know how can I pass a function to the component which is created by a function 

const MenuItem = ({title,indicatorColor,index,onPressItem}) => (
      <TouchableOpacity onPress={()=>onPressItem(index)} >
        <View
          style={{
            paddingLeft: 20,
            paddingBottom: 15,
            paddingTop: 15,
            flexDirection: 'row',
            width: 150,
            borderRightWidth: 2,
            borderRightColor: 'Colors.GREY_TWO',
            backgroundColor: indicatorColor,
            alignItems: 'center',
          }}>
          <View 
            style={{
              backgroundColor: 'black',
              height: 5,
              width: 5,
              borderRadius: 3,
              alignSelf: 'center',
  
            }} 
          /> 
          <Text style={{fontSize: 15, left: 5,alignItems: 'center',}}>{title}</Text>
        </View>
      </TouchableOpacity>
  );

  const onMenuItemPress = (index) => {
      console.log('menu selected:'.index);
  }
  
  <MenuItem title='Sort' indicatorColor='red' index='0' onPress={onMenuItemPress} />

Above code throws and an error saying onMenuPress is not a function,please suggest.

Upvotes: 0

Views: 43

Answers (2)

Javlonbek Sharipov
Javlonbek Sharipov

Reputation: 151

const MenuItem = ({title,indicatorColor,index,onPressItem}) => (
          <TouchableOpacity onPress={()=>onPressItem(index)} >
            <View
              style={{
                paddingLeft: 20,
                paddingBottom: 15,
                paddingTop: 15,
                flexDirection: 'row',
                width: 150,
                borderRightWidth: 2,
                borderRightColor: 'Colors.GREY_TWO',
                backgroundColor: indicatorColor,
                alignItems: 'center',
              }}>
              <View 
                style={{
                  backgroundColor: 'black',
                  height: 5,
                  width: 5,
                  borderRadius: 3,
                  alignSelf: 'center',

                }} 
              /> 
              <Text style={{fontSize: 15, left: 5,alignItems: 'center',}}>{title}</Text>
            </View>
          </TouchableOpacity>
      );

      const onMenuItemPress = (index) => {
          console.log('menu selected:'.index);
      }

      <MenuItem title='Sort' indicatorColor='red' index='0' onPressItem={onMenuItemPress} />

You should use onPressItem and not onPress in props

Upvotes: 1

Travis James
Travis James

Reputation: 1939

Wrap the function inside the Component you are returning:

const MenuItem = ({title,indicatorColor,index,onPressItem}) => {

     const onMenuItemPress = (index) => {
         console.log('menu selected:'.index);
     }

     return (
      <TouchableOpacity onPress={()=>onPressItem(index)} >
        <View
          style={{
            paddingLeft: 20,
            paddingBottom: 15,
            paddingTop: 15,
            flexDirection: 'row',
            width: 150,
            borderRightWidth: 2,
            borderRightColor: 'Colors.GREY_TWO',
            backgroundColor: indicatorColor,
            alignItems: 'center',
          }}>
          <View 
            style={{
              backgroundColor: 'black',
              height: 5,
              width: 5,
              borderRadius: 3,
              alignSelf: 'center',

            }} 
          /> 
          <Text style={{fontSize: 15, left: 5,alignItems: 'center',}}>{title} 
          </Text>
        </View>
      </TouchableOpacity>
     )
  };


  <MenuItem title='Sort' indicatorColor='red' index='0' onPress={onMenuItemPress} />

Upvotes: 0

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