Disabling Buttons in React Based on Input Fields
To disable buttons in React based on the value of an input field, use the disabled prop with a value pointing to a useState hook:
import { useState } from 'react'
export default function App() {
const [email, setEmail] = useState('')
return (
<div>
<input
type="email"
value={email}
onChange={event => setEmail(event.target.value)}
/>
<button disabled={!email}>Subscribe</button>
</div>
)
}In this code example, we only want to enable the button once the email input field has some value. We can achieve this by introducing a new useState hook, and set the value of the input field to this variable using an onChange event.
This negated value is then used for the disabled prop, telling React to only enable the button if the field is not empty. Note that empty strings are evaluated as false in JavaScript.
You can do the same with multiple input fields too, you just need to combine the different useState variables together for the disabled prop.
Disable button after clicking it
You could also disable buttons after clicking them to prevent multiple clicks by attaching an onClick event listener to the button and set the currentTarget.disabled property to true:
const disableOnClick = event => event.currentTarget.disabled = true
return <button onClick={disableOnClick}>Send</button>
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