CODEWITHSUNDEEP
reactjstypescripteventsinput
Sujio
Sujio

Reputation: 457

React Typescript input onChange event type?

I'm trying to get text from a input element, setting it to state and then rendering it back into the input box. However I think my event typing is wrong? I've searched online and tried implementing many solutions but none have worked so far. Any help is appreciated.

my component:

import React, { ChangeEvent, ChangeEventHandler, useState } from "react";

export default function Unidirectionflow() {
  const [state4, setState4] = useState("");
  const [state5, setState5] = useState("");

  let handleChange4 = (e: React.FormEvent<HTMLInputElement>): void => {
    setState3((e.target as HTMLInputElement).value);
  };

  let handleChange5 = (event: ChangeEvent<HTMLInputElement>) => {
    setState5(event.currentTarget.value);
  };

  return (
    <main>
      <input type="text" value={state4} onChange={() => handleChange4} />
      <input type="text" value={state5} onChange={() => handleChange5} />
    </main>
  );
}

Typescript input onchange event.target.value

React TypeScript: Correct Types for onChange

Can't type in React TextField Input

https://react-typescript-cheatsheet.netlify.app/docs/basic/getting-started/forms_and_events/

Upvotes: 1

Views: 29648

Answers (4)

LEMUEL ADANE
LEMUEL ADANE

Reputation: 8846

Just do this:

handleChange = (event: Event) => {
      const { value } = event.target as unknown as { value: string };
      setState(value);
};
  
<input type='text' onChange={handleChange} />

And the squeegee lines will go away.

Upvotes: 1

Ana Carla Paiva
Ana Carla Paiva

Reputation: 1

onChange={handleChange} See if this can help you!

Upvotes: 0

Nawaraj Jaishi
Nawaraj Jaishi

Reputation: 491

You can do like this

export default function Unidirectionflow() {
const [states, setStates] = useState({
state3:'',
state4:''
})

const handleChange = (
    e: React.ChangeEvent<HTMLTextAreaElement | HTMLInputElement>
  ) => {
    setStates({
      ...states,
      [e.target.name]: e.target.value.trim(),
    });
  };

  return (
    <main>
      <input type="text" name="state3" value={states.state3} onChange={handleChange} />
      <input type="text" name="state4" value={states.state4} onChange={handleChange} />
    </main>
  );
};

Upvotes: 4

Amila Senadheera
Amila Senadheera

Reputation: 13265

You have forgot to pass the event when calling the function

Try this

onChange={(e) => handleChange(e)}

Or

onChange={handleChange}

Code sandbox => https://codesandbox.io/s/dreamy-pateu-1mc6j?file=/src/App.tsx

Upvotes: -2

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