CODEWITHSUNDEEP
reactjstypescriptreact-nativetypescript-typingsreact-native-textinput
Xiiryo
Xiiryo

Reputation: 3267

Passing refs on React Native with TypeScript: (property) React.MutableRefObject<null>.current: null Object is possibly 'null'.ts(2531)

I have several fields on a React Native form and I would like that the focus jump from one to the next one each time the user validate the field with the virtual keyboard.

I came up with something like that:

        <NamedTextInput
          name={'email'}
          ref={emailRef}
          ...
          onSubmitEditing={() => passwordRef.current.focus()}
        />
        
        <NamedTextInput
          name={'password'}
          ref={passwordRef}
          ...
        />

On current I get a TypeScript error:

(property) React.MutableRefObject<null>.current: null
Object is possibly 'null'.ts(2531)

I tried to add ! and ? marks but it ends into:

Property 'focus' does not exist on type 'never'.ts(2339)

Any idea to solve this ?

Thanks

Upvotes: 2

Views: 5742

Answers (1)

Xiiryo
Xiiryo

Reputation: 3267

Ok, I got this one. I forgot the typing in the useRef declaration:

const passwordRef = useRef<TextInput>(null)

Then I can add a ! mark or check the existence the current ref without getting the "never" error:

onSubmitEditing={() => (passwordRef.current && passwordRef.current.focus())}

Upvotes: 10

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