app.js

import React from 'react';
import ReactDOM from 'react-dom';
import Formsy from 'formsy-react';

import MyInput from './../components/Input';

const currentYear = new Date().getFullYear();

const validators = {
  time: {
    regexp: /^(([0-1]?[0-9])|([2][0-3])):([0-5]?[0-9])(:([0-5]?[0-9]))?$/,
    message: 'Not valid time'
  },
  decimal: {
    regexp: /(^\d*\.?\d*[0-9]+\d*$)|(^[0-9]+\d*\.\d*$)/,
    message: 'Please type decimal value'
  },
  binary: {
    regexp: /^([0-1])*$/,
    message: '10101000'
  }
};

Formsy.addValidationRule('isYearOfBirth', (values, value) => {
  value = parseInt(value);
  if (typeof value !== 'number') {
    return false;
  }
  return value < currentYear && value > currentYear - 130;
});

const App = React.createClass({
  submit(data) {
    alert(JSON.stringify(data, null, 4));
  },
  render() {
    return (
      <Formsy.Form onSubmit={this.submit} className="custom-validation">
        <MyInput name="year" title="Year of Birth" type="number" validations="isYearOfBirth" validationError="Please type your year of birth" />
        <DynamicInput name="dynamic" title="..." />
        <button type="submit">Submit</button>
      </Formsy.Form>
    );
  }
});

const DynamicInput = React.createClass({
  mixins: [Formsy.Mixin],
  getInitialState() {
    return { validationType: 'time' };
  },
  changeValue(event) {
    this.setValue(event.currentTarget.value);
  },
  changeValidation(validationType) {
    this.setState({ validationType: validationType });
    this.setValue(this.getValue());
  },
  validate() {
    const value = this.getValue();
    console.log(value, this.state.validationType);
    return value ? validators[this.state.validationType].regexp.test(value) : true;
  },
  getCustomErrorMessage() {
    return this.showError() ? validators[this.state.validationType].message : '';
  },
  render() {
    const className = 'form-group' + (this.props.className || ' ') + (this.showRequired() ? 'required' : this.showError() ? 'error' : null);
    const errorMessage = this.getCustomErrorMessage();

    return (
      <div className={className}>
        <label htmlFor={this.props.name}>{this.props.title}</label>
        <input type='text' name={this.props.name} onChange={this.changeValue} value={this.getValue()}/>
        <span className='validation-error'>{errorMessage}</span>
        <Validations validationType={this.state.validationType} changeValidation={this.changeValidation}/>
      </div>
    );
  }
});

const Validations = React.createClass({
  changeValidation(e) {
    this.props.changeValidation(e.target.value);
  },
  render() {
    const { validationType } = this.props;
    return (
      <fieldset onChange={this.changeValidation}>
        <legend>Validation Type</legend>
        <div>
          <input name='validationType' type='radio' value='time' defaultChecked={validationType === 'time'}/>Time
        </div>
        <div>
          <input name='validationType' type='radio' value='decimal' defaultChecked={validationType === 'decimal'}/>Decimal
        </div>
        <div>
          <input name='validationType' type='radio' value='binary' defaultChecked={validationType === 'binary'}/>Binary
        </div>
      </fieldset>
    );
  }
});

ReactDOM.render(<App/>, document.getElementById('example'));