redux-form-validations

A collection of utilities for validations in redux-form V6

Note: this project is under initial development, API may change (we will follow sem-ver).

Example

$ npm install --save redux-form-validations

import { React } from 'react';
import { reduxForm } from 'redux-form';
import { buildValidations, isPresent, isZipCode, isDateInPast, isDateAfter } from 'redux-form-validations';
import { uniq } from 'lodash';

const { warn, validate } = buildValidations({
  firstName: {
    validate: isPresent
  },
  lastName: {
    warn: {
      ...isPresent,
      errorMessage: 'Last names are helpful'
    }
  },
  zipCode: {
    validate: {
      ...isZipCode,
      required: true
    }
  },
  dateApplied: {
    validate: [
      isDateInPast,
      isDateAfter('04/19/1988'),
      {
        ...isPresent,
        validateIf: (allValues, value) => allValues.dependentField
      }
    ]
  },
  _fieldArrays: {
    hobbies: {
      _error: {
        validate: {
          validator: (fields) => {
            const names = field.map(field => field.name);
            return uniq(names).length === names.length;
          },
          errorMessage: 'Hobby names must be unique'
        }
      }
    }
  }
});

class MyForm extends React.Component { ... }

export default reduxForm({ warn, validate })(MyForm);

Custom validators

Every field defined in your schema object has top-level keys warn and validate which are used to build warn and validate functions for redux-form connected components. These keys take a validator object, which has the shape:

validator: Function (allFields, value) => Boolean If the return value is true, then the field is valid, if false, an error is added. errorMessage: String || Function (allField, value) => String The error message that is returned with the validate or warn function call when the validator returns false.

Alternatively, you can assign a function that returns a validator object to either warn or validate that will receive props from your ReduxForm wrapped component. This is helpful if you need to validate based on information outside of the form state.

Example:

const { warn, validate } = buildValidations({
  firstName: {
    validate: (props) => ({
      validator: (fields) => {
        return props.someBoolean && fields.numbers > 0,
      }
    }),
  },
});

Prior work

redux-form-schema is the main inspiration for this project. After redux-form moved to V6, this project was deprecated, since a large part of its functionality was obselete. However, we still liked being able to define our validations with a simple and declarative API. This small library aims to supply that abstraction with some built-in validators and configuration options.

Contributing/ Todos

This is a green project, and we are open to feature suggestions and other improvements. Additionally, you can contribute by helping with these outstanding todos:

• Tighten up API for V1
• Add documentation
• Add more validators for common uses
• More configuration options