search

Home  >  Q&A  >  body text

Callback function returning anonymous function gives error on onClick

import React from 'react'

export default function Test() {
  const handleClick = () => (label: string) => {
    console.log('label: ' + label)
  }

  return <button onClick={handleClick('red one')}>click me</button>
}

TypeScript compiler complains about my code, what am I doing wrong?

Type '(label: string) => void' is not assignable to type 'MouseEventHandler<HTMLButtonElement>'.
  Types of parameters 'label' and 'event' are incompatible.
    Type 'MouseEvent<HTMLButtonElement, MouseEvent>' is not assignable to type 'string'.ts(2322)
index.d.ts(1494, 9): The expected type comes from property 'onClick' which is declared here on type 'DetailedHTMLProps<ButtonHTMLAttributes<HTMLButtonElement>, HTMLButtonElement>'

P粉649990273P粉649990273285 days ago505

reply all(2)I'll reply

  • P粉587780103

    P粉5877801032024-04-03 14:56:23

    handleClick The function does not require any type of parameters, but you pass it a string.

    should be:

    import React from 'react'
    
    export default function Test() {
      const handleClick = (label: string) => () => {
        console.log('label: ' + label)
      }
    
      return 
    }

    reply
    0
  • P粉378890106

    P粉3788901062024-04-03 13:21:28

    vice versa

    should be

    (label: string) => (e: any) => {

    instead of

    (e: any) => (label: string) => {
    import React from 'react'
    
    export default function Test() {
      const handleClick = (label: string) => (e: any) => {
        console.log('label: ' + label)
      }
    
      return 
    }

    reply
    0
  • Cancelreply