Question 108380 in React native Question posted in
The official React Native documentation can be found here.

String Striping React Native

I am trying to strip part of a string in react native. And I am getting an error saying that String.slice() method cannot read from an undefined.

<TextInput style={styles.largeFormInput}
onChange={(event) => {

          let value = event.target.value;
          setBio(value.slice(0, 10));
        }}

        value={bio} name={"bio"}
        placeholder={"Brief Biography (i.e. hobbies, family life, welness tools & programs that work for you)"} placeholderStyle={styles.placeholderStyle} />

{/* was expecting the string to strip correctly and it works fine on web, but it does not work on my expo go simulator */}

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3

Answers


  1. 0

    There’s no onChange listener in TextInput.

    You should be using onChangeText={text => onChangeText(text)} as per
    ref-doc

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  2. 0

    try use onChangeText instead of onChange

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  3. 0

    The event.target.value is undefined. You have to use onChangeText

    onChangeText={(value) => setBio(value.slice(0, 10))}
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