Prevent users from clicking buttons until all mandatory fields are filled out using react-hook-form

I am seeking guidance on how to dynamically disable a button based on the input values of both Name and State in the given code snippet. Specifically, I want to restrict button functionality until both name and state fields are filled out, regardless of whether the email field is empty or not.

import React from "react";
import { useForm, SubmitHandler } from "react-hook-form";

type FormValues = {
  name: string;
  state: string;
  email: string;
};

export default function App() {
  const { register, handleSubmit } = useForm<FormValues>();
  const onSubmit: SubmitHandler<FormValues> = data => console.log(data);

  return (
    <form onSubmit={handleSubmit(onSubmit)}>
      <input {...register("name")} />
      <input {...register("state")} />
      <input type="email" {...register("email")} />

      <input type="submit" />
    </form>
  );
}

Answer №1

To accomplish this, you can use the isValid property from the formState object. Simply disable the button when isValid is false and ensure that the required property is set to true for both name and state using the register method. This way, the button will be disabled whenever either the name or state field is empty, without consideration of the email input.

Here is a functional implementation:

import React from "react";
import { useForm, SubmitHandler } from "react-hook-form";

type FormValues = {
  name: string;
  state: string;
  email: string;
};

export default function App() {
  const { register, handleSubmit, formState } = useForm<FormValues>();
  const onSubmit: SubmitHandler<FormValues> = data => console.log(data);

  return (
    <form onSubmit={handleSubmit(onSubmit)}>
      <input {...register("name", {required: true})} />
      <input {...register("state", {required: true})} />
      <input type="email"   {...register("email")}/>

      {/* Disable submit button when Name or State is empty */}
      <input type="submit" disabled={!formState.isValid} />
    </form>
  );
}

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