Redux Form - Async Blur Validation Example

README.md

Redux Form - Async Blur Validation Example

The original example: Redux Form - Async Blur Validation Example

App.js

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

const store = createStore(reducer);

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

  handleSubmit(values) {
    const self = this;
    self.setState({debug: JSON.stringify(values)});
  }

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

export default App;

asyncValidate.js

const sleep = ms => new Promise(resolve => setTimeout(resolve, ms))

const asyncValidate = (values /*, dispatch */) => {
  return sleep(1000).then(() => {
    // simulate server latency
    if (['john', 'paul', 'george', 'ringo'].includes(values.username)) {
      const obj = { username: 'That username is taken' }
      throw obj;
    }
  })
}

export default asyncValidate

AsyncValidationForm.js

import React from 'react'
import { Field, reduxForm } from 'redux-form'
import validate from './validate'
import asyncValidate from './asyncValidate'
import {
  Form, FormGroup,
  Row, Col,
  Button
} from 'react-bootstrap'
import 'font-awesome/css/font-awesome.css'
import FontAwesome from 'react-fontawesome'

const renderField = ({
  input,
  label,
  type,
  meta: { asyncValidating, touched, error }
}) => (
  <FormGroup>
    <Row>
      <Col sm={2}>
        <label>{label}</label>
      </Col>
      <Col sm={8}>
        <input {...input} type={type} placeholder={label} size="40" />
        <span>
          {
            asyncValidating
            ? <FontAwesome name="spinner" spin />
            : ''
          }
        </span>
        {touched && error && <span>{error}</span>}
      </Col>
    </Row>
  </FormGroup>
)

const AsyncValidationForm = props => {
  const { handleSubmit, pristine, reset, submitting, asyncValidating } = props
  return (
    <Form onSubmit={handleSubmit}>
      <Field
        name="username"
        type="text"
        component={renderField}
        label="Username"
      />
      <Field
        name="password"
        type="password"
        component={renderField}
        label="Password"
      />
      <div>
        <Button type="submit" bsStyle="primary"
          disabled={asyncValidating || submitting}>
          Sign Up
        </Button>
        <Button type="button" bsStyle="default"
          disabled={pristine || submitting} onClick={reset}>
          Clear Values
        </Button>
      </div>
    </Form>
  )
}

export default reduxForm({
  form: 'asyncValidation', // a unique identifier for this form
  validate,
  asyncValidate,
  asyncBlurFields: ['username']
})(AsyncValidationForm)

cra-script.sh

#!/bin/bash

NAME=redux-form-async-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-async-validation",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "bootstrap": "^3.3.7",
    "font-awesome": "^4.7.0",
    "react": "^16.0.0",
    "react-bootstrap": "^0.31.5",
    "react-dom": "^16.0.0",
    "react-fontawesome": "^1.6.1",
    "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"
  }
}

reducer.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;

validate.js

const validate = values => {
  const errors = {}
  if (!values.username) {
    errors.username = 'Required'
  }
  if (!values.password) {
    errors.password = 'Required'
  }
  return errors
}

export default validate