@curiouser/react-forms

Features

boilerplate-free field label and error rendering
validation tests and error messages as data and functions with support for validations conditioned upon form data
library of common form fields with support for supplying your own field components
use default store (component state) or supply your own functions describing how to write field values (you're responsible for supplying a values prop)
model first architecture-ready; bundle validations and data transformations into a single prop
observable
toggle validateAsYouGo
support for complex form data structures including collections, nested objects and collections, etc
support for collections with boilerplate management of persistent and temporary data

Install

NPM

npm install @curiouser/react-forms

Yarn

yarn add @curiouser/react-forms

Usage

Render a simple form

A simple login form with validation that requires both fields to be filled in and a password of at least 6 characters.

As a functional component (in the future hooks may be available)

import React from 'react';

import { Form, validator } from '@curiouser/react-forms';
import { PasswordField, TextField } from '@curiouser/react-forms';
import '@curiouser/react-forms/dist/index.css';

const formProps = {
  formName: 'my-form',
  initialValues: {
    password: '',
    username: '',
  },
  validations: [{
    names: [ 'username', 'password' ],
    tests: [[ validator.tests.required, validator.messages.required ]],
  }, {
    names: [ 'password' ],
    tests: [[ validator.tests.minLength(6), validator.messages.minLength(6) ]],
  }],
}

export default function MyForm () {
  const form = React.useRef();

  const handleSubmit = React.useCallback(() => {
    if (!form.current.validate() || form.current.state.isLoading) return;

    const formData = form.current.getData();

    // do something with formData...
  }, []);

  return (
    <Form ref={form} {...formProps}>
      <form onSubmit={handleSubmit}>
        <div className="form__fields">
          <TextField label="Name" name="username" />
          <PasswordField label="Password" name="password" />
        </div>
        <button type="submit">Sign in</button>
      </form>
    </Form>
  );
}

As a class component leveraging inheritance

import React from 'react';

import { Form, util, validator } from '@curiouser/react-forms';
import { PasswordField, TextField } from '@curiouser/react-forms';
import '@curiouser/react-forms/dist/index.css';

class MyForm extends Form {
  static defaultProps = {
    ...Form.defaultProps,
    formName: 'my-form',
    initialValues: {
      password: '',
      username: '',
    },
    validations: [{
      names: [ 'username', 'password' ],
      tests: [[ validator.tests.required, validator.messages.required ]],
    }, {
      names: [ 'password' ],
      tests: [
        [ validator.tests.minLength(6), validator.messages.minLength(6) ],
        [ validator.tests.minLength(8), () => `Password is weak, consider making it 8 characters or more`), { warning: true } ],
      ],
    }],
  };

  constructor (...args) {
    super(...args);
    util.bindMethods(this);
  }

  handleSubmit () {
    if (!this.validate() || this.state.isLoading) return;

    const formData = this.getData();

    // do something with formData...
  }

  render () {
    return super.render(
      <form className="form" onSubmit={this.handleSubmit}>
        <div className="form__fields">
          <TextField label="Name" name="username" />
          <PasswordField label="Password" name="password" />
        </div>
        <button type="submit">Sign in</button>
      </form>
    );
  }
}

More examples in the repo

Run all of the form examples in your browser with yarn start. Here are some common examples:

Extending with your own form field components

Form fields are broken into two, one representing the field (with label, error messaging and className generation) and the actual input/control component.

Field component

import React from 'react';
import Field from 'form/dist/components/fields/Field.jsx';
import NativeSelect from './NativeSelect.jsx';

export default function NativeSelectField (props) {
  return <Field {...props} ref={props.forwardedRef} component={NativeSelect} type="select" />
}

Input/Control component

import React from 'react';
import { util } from '@curiouser/react-forms';

export default function NativeSelect ({ forwardedRef, getValue, id, options, placeholder, required = true, setValue }) {
  const handleChange = React.useCallback((e) => setValue(e.target.value), [ setValue ]);

  return (
    <select id={id} onChange={handleChange} ref={forwardedRef} value={getValue()}>
      {util.renderIf(placeholder, () => (
        <option disabled={required} value="">{placeholder}</option>
      ))}
      {options.map(o => (
        <option key={o.value} value={o.value}>{o.label}</option>
      ))}
    </select>
  );
}

Styles

You're responsible for importing or linking the stylesheet with import '@curiouser/react-forms/dist/index.css'; or any other way you like, it's just a css file. The package styles don't try to do anything pretty for you, just provide functional styles. Class names try to follow the BEM naming convention.

CSS variables

The exported stylesheet predefines these CSS variables that you're encouraged to override.

.form {
  --form-color-error: red;
  --form-color-gray: #dedede;
  --form-color-warning: #fc9403;
  --form-field-height: 46px;
}