formsy-react

formsy-react

A form input builder and validator for React.

Quick Start	API	1.x API

Background

christianalfoni wrote an article on forms and validation with React, Nailing that validation with React JS, the result of that was this library.

The main concept is that forms, inputs, and validation are done very differently across developers and projects. This React component aims to be that “sweet spot” between flexibility and reusability.

This project was originally located at christianalfoni/formsy-react if you're looking for old issues.

What You Can Do

1. Build any kind of form element components. Not just traditional inputs, but anything you want, and get that validation for free
2. Add validation rules and use them with simple syntax
3. Use handlers for different states of your form. (onSubmit, onValid, etc.)
4. Pass external errors to the form to invalidate elements (E.g. a response from a server)
5. Dynamically add form elements to your form and they will register/unregister to the form

Install

yarn add formsy-react react react-dom and use with webpack, browserify, etc.

Formsy component packages

• twisty/formsy-react-components - Bootstrap components for a Formsy-React form.
• zabute/formsy-semantic-ui-react - Semantic-Ui-React components for a Formsy-React form.

1.x to 2.x Upgrade Guide

The 2.0 release fixed a number of legacy decisions in the Formsy API, mostly a reliance on function props over value props passed down to wrapped components. However, the API changes are minor and listed below.

• getErrorMessage() => errorMessage
• getErrorMessages() => errorMessages
• getValue() => value
• hasValue() => hasValue
• isFormDisabled(): => isFormDisabled
• isFormSubmitted() => isFormSubmitted
• isPristine() => isPristine
• isRequired() => isRequired
• isValid(): => isValid
• showError() => showError
• showRequired() => showRequired

Quick Start

1. Build a Formsy element

…

withFormsy is a Higher-Order Component that exposes additional props to MyInput. See the API documentation to view a complete list of the props.

2. Use your Formsy element

…

This code results in a form with a submit button that will run the submit method when the form is submitted with a valid email. The submit button is disabled as long as the input is empty (required) and the value is not an email (isEmail). On validation error it will show the message: "This is not a valid email".

3. More

See the API for more information.

Contribute

• Fork repo
• yarn
• yarn lint runs lint checks
• yarn test runs the tests
• npm run deploy build and release formsy

Changelog

Check out our Changelog and releases

License

The MIT License (MIT)