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react-final-form

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react-final-form

High performance subscription-based form state management for React

0.0.5
Source
npm
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431K
5.8%
Maintainers
1
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What is react-final-form?

react-final-form is a framework-agnostic form state management library for React. It provides a simple and flexible way to manage form state, validation, and submission handling in React applications.

What are react-final-form's main functionalities?

Form State Management

This feature allows you to manage the state of your form fields. The code sample demonstrates a simple form with two fields, 'firstName' and 'lastName', and a submit button. The form state is managed and displayed in real-time.

const MyForm = () => (
  <Form
    onSubmit={formValues => {
      console.log(formValues);
    }}
    render={({ handleSubmit, form, submitting, pristine, values }) => (
      <form onSubmit={handleSubmit}>
        <div>
          <label>First Name</label>
          <Field name="firstName" component="input" type="text" placeholder="First Name" />
        </div>
        <div>
          <label>Last Name</label>
          <Field name="lastName" component="input" type="text" placeholder="Last Name" />
        </div>
        <div>
          <button type="submit" disabled={submitting || pristine}>
            Submit
          </button>
        </div>
        <pre>{JSON.stringify(values, 0, 2)}</pre>
      </form>
    )}
  />
);

Field-Level Validation

This feature allows you to add validation to individual fields. The code sample shows how to add a 'required' validation to the 'firstName' and 'lastName' fields.

const required = value => (value ? undefined : 'Required');

const MyForm = () => (
  <Form
    onSubmit={formValues => {
      console.log(formValues);
    }}
    render={({ handleSubmit }) => (
      <form onSubmit={handleSubmit}>
        <div>
          <label>First Name</label>
          <Field name="firstName" component="input" type="text" placeholder="First Name" validate={required} />
        </div>
        <div>
          <label>Last Name</label>
          <Field name="lastName" component="input" type="text" placeholder="Last Name" validate={required} />
        </div>
        <div>
          <button type="submit">
            Submit
          </button>
        </div>
      </form>
    )}
  />
);

Form-Level Validation

This feature allows you to add validation to the entire form. The code sample demonstrates how to validate the 'firstName' and 'lastName' fields at the form level.

const validate = values => {
  const errors = {};
  if (!values.firstName) {
    errors.firstName = 'Required';
  }
  if (!values.lastName) {
    errors.lastName = 'Required';
  }
  return errors;
};

const MyForm = () => (
  <Form
    onSubmit={formValues => {
      console.log(formValues);
    }}
    validate={validate}
    render={({ handleSubmit }) => (
      <form onSubmit={handleSubmit}>
        <div>
          <label>First Name</label>
          <Field name="firstName" component="input" type="text" placeholder="First Name" />
        </div>
        <div>
          <label>Last Name</label>
          <Field name="lastName" component="input" type="text" placeholder="Last Name" />
        </div>
        <div>
          <button type="submit">
            Submit
          </button>
        </div>
      </form>
    )}
  />
);

Other packages similar to react-final-form

    formik

    Formik is a popular form library for React that provides a higher-level API for managing form state, validation, and submission. It is similar to react-final-form but offers more built-in hooks and components for easier integration.

    react-hook-form

    React Hook Form is a performant, flexible, and extensible form library for React. It uses hooks to manage form state and validation, making it a lightweight alternative to react-final-form with a focus on performance.

    redux-form

    Redux Form is a form state management library that integrates with Redux. It is similar to react-final-form but is more tightly coupled with Redux, making it suitable for applications that already use Redux for state management.

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Package last updated on 26 Nov 2017

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