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ReactJS form library to create uncontrolled form structures with nested fields, validations and much more!
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README.md

Create ReactJS uncontrolled form structures with nested fields, validations and much more! 🚀

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Overview

Unform is a performance focused library that helps you creating beautiful forms in React with the power of uncontrolled components performance and React Hooks.

Key features

  • Beautiful syntax;
  • React Hooks 😍;
  • Performance focused;
  • Use of uncontrolled components;
  • Integration with pickers, dropdowns and other libraries;

Why not Formik, Redux Form or another library?

Formik/Redux Form has a really great syntax while it has a really poor support to uncontrolled components and deep nested data structures. With unform it's easy to create forms with complex relationships without losing performance.

Roadmap

  • Native checkbox/radio support;
  • Styled components support;
  • React Native support (should we?);
  • Better docs;

Installation

Just add unform to your project:

yarn add @rocketseat/unform

Table of contents

Guides

Basics

Unform exposes three default form elements: <Input />, <Select /> and <Textarea />. Currently, <Select /> element does not support multiple values, you can use React Select example to achieve that.

import React from "react";
import { Form, Input } from "@rocketseat/unform";

function App() {
  function handleSubmit(data) {
    console.log(data);

    /**
     * {
     *   email: 'email@example.com',
     *   password: "123456"
     * }
     */
  };

  return (
    <Form onSubmit={handleSubmit}>
      <Input name="email" />
      <Input name="password" type="password" />

      <button type="submit">Sign in</button>
    </Form>
  );
}

Reset form

import React from "react";
import { Form, Input } from "@rocketseat/unform";

function App() {
  function handleSubmit(data, { resetForm }) {
    resetForm();
  };

  return (
    <Form onSubmit={handleSubmit}>
      <Input name="email" />
      <Input name="password" type="password" />

      <button type="submit">Sign in</button>
    </Form>
  );
}

Nested fields

import React from "react";
import { Form, Input, Scope } from "@rocketseat/unform";

function App() {
  function handleSubmit(data) {
    console.log(data);

    /**
     * {
     *   name: 'Diego',
     *   address: { street: "Name of street", number: 123 }
     * }
     */
  };

  return (
    <Form onSubmit={handleSubmit}>
      <Input name="name" />

      <Scope path="address">
        <Input name="street" />
        <Input name="number" />
      </Scope>

      <button type="submit">Save</button>
    </Form>
  );
}

Initial data

import React from "react";
import { Form, Input, Scope } from "@rocketseat/unform";

function App() {
  const initialData = {
    name: 'John Doe',
    address: {
      street: 'Sample Avenue',
    },
  }

  function handleSubmit(data) {};

  return (
    <Form onSubmit={handleSubmit} initialData={initialData}>
      <Input name="name" />

      <Scope path="address">
        <Input name="street" />
        <Input name="number" />
      </Scope>

      <button type="submit">Save</button>
    </Form>
  );
}

Validation

import React from "react";
import { Form, Input } from "@rocketseat/unform";
import * as Yup from 'yup';

const schema = Yup.object().shape({
  email: Yup.string()
    .email('Custom invalid email message')
    .required('Custom required message'),
  password: Yup.string().min(4).required(),
})

function App() {
  function handleSubmit(data) {};

  return (
    <Form schema={schema} onSubmit={handleSubmit}>
      <Input name="email" />
      <Input name="password" type="password" />

      <button type="submit">Save</button>
    </Form>
  );
}

Manipulate data

import React, { useState } from "react";
import { Form, Input } from "@rocketseat/unform";
import * as Yup from 'yup';

const schema = Yup.object().shape({
  name: Yup.string().required(),
  email: Yup.string().email().required(),
  password: Yup.string().when('$updatePassword', {
    is: true,
    then: Yup.string().min(4).required(),
    otherwise: Yup.string().strip(true)
  }),
})

function App() {
  const [updatePassword, setUpdatePassword] = useState(false);

  const initialData = {
    name: 'John Doe',
    email: 'johndoe@example.com',
  }

  function handleSubmit(data) {};

  return (
    <Form
      schema={schema}
      initialData={initialData}
      context={{ updatePassword }}
      onSubmit={handleSubmit}
    >
      <Input name="name" />
      <Input name="email" />

      <input
        type="checkbox"
        name="Update Password"
        checked={updatePassword}
        onChange={e => setUpdatePassword(e.target.checked)}
      />

      <Input name="password" type="password" />

      <button type="submit">Save</button>
    </Form>
  );
}

Custom elements

Sometimes we need to use third-party component in our forms. But don't you worry, Unform has your back! You can do that via useField which provides all the resources you need to use your component with Unform.

Below are some examples with react-select and react-datepicker.

React select

import React, { useRef, useEffect } from "react";
import Select from "react-select";

import { useField } from "@rocketseat/unform";

export default function ReactSelect({
  name,
  label,
  options,
  multiple,
  ...rest
}) {
  const ref = useRef(null);
  const { fieldName, registerField, defaultValue, error } = useField(name);

  function parseSelectValue(selectValue) {
    if (!multiple) {
      return selectValue ? selectValue.id : "";
    }

    return selectValue ? selectValue.map(option => option.id) : [];
  }

  useEffect(() => {
    registerField({
      name: fieldName,
      ref: ref.current,
      path: "state.value",
      parseValue: parseSelectValue,
      clearValue: selectRef => {
        selectRef.select.clearValue();
      }
    });
  }, [ref.current, fieldName]);

  function getDefaultValue() {
    if (!defaultValue) return null;

    if (!multiple) {
      return options.find(option => option.id === defaultValue);
    }

    return options.filter(option => defaultValue.includes(option.id));
  }

  return (
    <>
      {label && <label htmlFor={fieldName}>{label}</label>}

      <Select
        name={fieldName}
        aria-label={fieldName}
        options={options}
        isMulti={multiple}
        defaultValue={getDefaultValue()}
        ref={ref}
        getOptionValue={option => option.id}
        getOptionLabel={option => option.title}
        {...rest}
      />

      {error && <span>{error}</span>}
    </>
  );
}

React datepicker

import React, { useRef, useEffect, useState } from "react";
import ReactDatePicker from "react-datepicker";

import { useField } from "@rocketseat/unform";

import "react-datepicker/dist/react-datepicker.css";

export default function DatePicker({ name }) {
  const ref = useRef(null);
  const { fieldName, registerField, defaultValue, error } = useField(name);
  const [selected, setSelected] = useState(defaultValue);

  useEffect(() => {
    registerField({
      name: fieldName,
      ref: ref.current,
      path: "props.selected",
      clearValue: pickerRef => {
        pickerRef.clear();
      }
    });
  }, [ref.current, fieldName]);

  return (
    <>
      <ReactDatePicker
        name={fieldName}
        selected={selected}
        onChange={date => setSelected(date)}
        ref={ref}
      />
      {error && <span>{error}</span>}
    </>
  );
}

Contributing

Thanks for being interested on making this package better. We encourage everyone to help improving this project with some new features, bug fixes and performance issues. Please take a little bit of your time to read our guides, so this process can be faster and easier.

Contribution Guidelines

Take a moment to read about our Contribution Guidelines so you can understand how to submit an issue, commit and create pull requests.

Code of Conduct

We expect you to follow our Code of Conduct. You can read it to understand what kind of behaviour will and will not be tolerated.

License

MIT © Rocketseat

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