export default function Form() {
const [user, setUser] = useState({
    name: "",
    numOfQs: 0
})
console.log(user)
function handleUserDataChange(event) {
    setUser(prevUser => {
        return {
            ...prevUser,
            [event.target.name]: event.target.value
        }
    })
}
return (
    <>
        <input 
        type="text" 
        placeholder="username"
        name="name"
        value={user.name}
        onChange={handleUserDataChange} />
        <input 
        type="number" 
        name="numOfQs"
        value={user.numOfQs}
        onChange={handleUserDataChange} />
    </>
)}

I was trying to build my form using react, and when I tried to use input[type: number] on the form field it was giving me this error, don't know why. I was reading through react docs about forms, and everything from the checkbox, radio buttons, textarea was all working fine. but when I used an input element of the type number, I got the following error.

*!Warning: This synthetic event is reused for performance reasons. If you're seeing this, you're accessing the property target on a released/nullified synthetic event. This is set to null. If you must keep the original synthetic event around, use event.persist(). See fb.me/react-event-pooling for more information.

so, the problem only arises when an input of type "number" is introduced. when I remove it all of my other form elements work fine.

I'm still in the learning phase of react. please help me out.

CodePudding user response：

This happened because the event that passed into the function is used as an asynchronous event.

To fix this, decompose the event object

function handleUserDataChange(event) {

    const { name, value } = event.target;
    setUser(prevUser => {
        return {
            ...prevUser,
            [name]: value
        }
    })
}