Redux Form - Synchronous Validation Example

README.md

Redux Form - Synchronous Validation Example

Original example: Redux Form - Synchronous Validation Example

App.js

import React from 'react';
import SyncValidationForm from './SyncValidationForm';
import { createStore } from 'redux';
import { Provider } from 'react-redux';
import reducer from './reducers';
import "bootstrap/dist/css/bootstrap.css";

const store = createStore(reducer);

class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {};
    this.setState({debug: ''});
  }

  submit(values) {
    this.setState({debug: JSON.stringify(values)});
  }

  render() {
    const submit = this.submit.bind(this);
    return (
      <Provider store={store}>
        <div>
          <SyncValidationForm onSubmit={submit} />
          <div>
            <pre>{this.state.debug}</pre>
          </div>
        </div>
      </Provider>
    );
  }
}

export default App;

cra-script.sh

#!/bin/bash

NAME=redux-form-sync-validation

echo -n "This script runs create-react-app $NAME. Proceed? (Y/N) "
read YN
if [ x$YN != xY ]
then
  echo "Bye."
  exit
fi

# Delete this line only if you are sure what is done from this line on.
exit

create-react-app $NAME
cd $NAME
cp -v ../package.json .
cd src
rm -f App.* logo.svg
cp -v ../../*.js .
cd ..
yarn install

echo 'To launch the dev server, run `yarn run start`.'

package.json

{
  "name": "redux-form-sync-validation",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "bootstrap": "^3.3.7",
    "react": "^16.0.0",
    "react-bootstrap": "^0.31.5",
    "react-dom": "^16.0.0",
    "react-redux": "^5.0.6",
    "redux": "^3.7.2",
    "redux-form": "^7.1.2"
  },
  "devDependencies": {
    "react-scripts": "1.0.14"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  }
}

reducers.js

import { combineReducers } from 'redux';
import { reducer as formReducer } from 'redux-form';

const rootReducer = combineReducers({
  // ...your other reducers here
  // you have to pass formReducer under 'form' key,
  // for custom keys look up the docs for 'getFormState'
  form: formReducer
});

export default rootReducer;

SyncValidationForm.js

import React from 'react';
import { Field, reduxForm } from 'redux-form';
import {
  Form, FormGroup,
  Grid, Row, Col,
  Button
} from 'react-bootstrap';

const validate = values => {
  const errors = {}
  if (!values.username) {
    errors.username = 'Required'
  } else if (values.username.length > 15) {
    errors.username = 'Must be 15 characters or less'
  }
  if (!values.email) {
    errors.email = 'Required'
  } else if (!/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i.test(values.email)) {
    errors.email = 'Invalid email address'
  }
  if (!values.age) {
    errors.age = 'Required'
  } else if (isNaN(Number(values.age))) {
    errors.age = 'Must be a number'
  } else if (Number(values.age) < 18) {
    errors.age = 'Sorry, you must be at least 18 years old'
  }
  return errors
};

const warn = values => {
  const warnings = {}
  if (values.age < 19) {
    warnings.age = 'Hmm, you seem a bit young...'
  }
  return warnings
};

const renderField = ({
  input,
  label,
  type,
  meta: { touched, error, warning }
}) => (
  <FormGroup>
    <Grid>
      <Row>
        <Col sm={2}>
          <label>{label}</label>
        </Col>
        <Col sm={8}>
          <input {...input} placeholder={label} type={type} size="48" />
          {
            touched &&
            ((error && <span>{error}</span>) ||
              (warning && <span>{warning}</span>))
          }
        </Col>
      </Row>
    </Grid>
  </FormGroup>
);

const SyncValidationForm = props => {
  const { handleSubmit, pristine, reset, submitting } = props;
  return (
    <Form onSubmit={handleSubmit} horizontal >
      <Field
        name="username"
        type="text"
        component={renderField}
        label="Username"
      />
      <Field name="email" type="email" component={renderField} label="Email" />
      <Field name="age" type="number" component={renderField} label="Age" />
      <div>
        <Button type="submit" bsStyle="primary" disabled={submitting}>
          Submit
        </Button>
        <Button type="button" bsStyle="default"
          disabled={pristine || submitting} onClick={reset}>
          Clear Values
        </Button>
      </div>
    </Form>
  );
};

export default reduxForm({
  form: 'syncValidation', // a unique identifier for this form
  validate, // <--- validation function given to redux-form
  warn // <--- warning function given to redux-form
})(SyncValidationForm);