Using ref in Typescript Nextjs

Question

I learning typescript in react but got an warning

import {useref} from 'react'

export default function test(){
   cons tmp = useRef()
   const data = tmp.current?.value
   return (
      <div>
        <input type ="text" ref={tmp}/>
      </div>

) }

but I got warning like this

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

can someone help me to fix it ?

and one more question, what Type Annotation of props.example() ?

Alex Wayne · Accepted Answer · 2021-05-29 19:10:14Z

12

You need to provide a type to useRef so it know what to expect. You also need to initialize it as null.

const tmp = useRef<HTMLInputElement>(null)

Then everything works as you expect.

Working example on Typescript playground

answered May 29, 2021 at 19:10

Alex Wayne

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2 Comments

just test Over a year ago

thanks, I have 1 more question, if I have a props example props.example(), what type annotation ?

Alex Wayne Over a year ago

Typically I defined react props like so: tsplay.dev/m3Akbw but if you need more help than that, please make a new question where you can explain your situation in full and get the proper help that you need.

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