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handleSubmit

Ready to send to the server

handleSubmit:
((data: Object, e?: Event) => void, (errors: Object, e?: Event) => void) => Function

This function will receive the form data if form validation is successful.

Rules

  • You can easily submit form asynchronously with handleSubmit.

    // It can be invoked remotely as well
handleSubmit(onSubmit)();

// You can pass an async function for asynchronous validation.
handleSubmit(async (data) => await fetchAPI(data))

  • disabled inputs will appear as undefined values in form values. If you want to prevent users from updating an input and wish to retain the form value, you can use readOnly or disable the entire <fieldset />. Here is an example.

  • During the callback, if the function itself throws an error inside of handleSubmit, it will not swallow the error itself but bubble it up instead and isSubmitSuccessful will be remained as false.

    const onSubmit = () => {
  throw new Error('Something is wrong')
}

handleSubmit(onSubmit).catch((e) => {
  // you will need to catch that error
})

Props

NameTypeDescription
SubmitHandler(data: Object, e?: Event) => voidA successful callback.
SubmitErrorHandler(errors: Object, e?: Event) => voidAn error callback.
CodeSandbox 
import React from "react";
import { useForm } from "react-hook-form";

export default function App() {
  const { register, handleSubmit } = useForm();
  const onSubmit = (data, e) => console.log(data, e);
  const onError = (errors, e) => console.log(errors, e);

  return (
    <form onSubmit={handleSubmit(onSubmit, onError)}>
      <input {...register("firstName")} />
      <input {...register("lastName")} />
      <button type="submit">Submit</button>
    </form>
  );
}import React from "react";
import { useForm, SubmitHandler } from "react-hook-form";

type FormValues = {
  firstName: string;
  lastName: 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("firstName")} />
      <input {...register("lastName")} />
      <input type="email" {...register("email")} />

      <input type="submit" />
    </form>
  );
}
CodeSandbox 
import React from "react";
import { useForm } from "react-hook-form";

const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));

function App() {
  const { register, handleSubmit, errors, formState } = useForm();
  const onSubmit = async data => {
    await sleep(2000);
    if (data.username === "bill") {
      alert(JSON.stringify(data));
    } else {
      alert("There is an error");
    }
  };

  return (
    <form onSubmit={handleSubmit(onSubmit)}>
      <label htmlFor="username">User Name</label>
      <input placeholder="Bill" {...register("username"} />

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