client/src/components/Login.js
author Alexandre Segura <mex.zktk@gmail.com>
Mon, 26 Jun 2017 16:43:22 +0200
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Improve login errors.
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import React, { Component } from 'react';
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import { connect } from 'react-redux';
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import { bindActionCreators } from 'redux';
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import { Grid, Row, Col, Panel, FormGroup, ControlLabel, FormControl, Button, Alert, HelpBlock } from 'react-bootstrap';
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import '../App.css';
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import Navbar from './Navbar';
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import * as authActions from '../actions/authActions';
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class Login extends Component {
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  login = () => {
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    const username = this.username.value;
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    const password = this.password.value;
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    this.props.authActions.loginSubmit(username, password);
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  }
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  onClickRegister = (e) => {
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    e.preventDefault();
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    this.props.history.push('/register');
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  }
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  renderErrorMessage(errorMessages, fieldname) {
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    if (errorMessages && errorMessages.has(fieldname)) {
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      return errorMessages.get(fieldname).map((message, key) =>
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        <HelpBlock key={ key }>{ message }</HelpBlock>
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      );
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    }
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  }
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  renderNonFieldErrors(errorMessages) {
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    if (errorMessages && errorMessages.has('non_field_errors')) {
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      const errors = errorMessages.get('non_field_errors');
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      return (
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        <Alert bsStyle="danger">
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        { errors.map((message, key) =>
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          <p key={ key }>{ message }</p>
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        ) }
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        </Alert>
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      )
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    }
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  }
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  render() {
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    const panelHeader = (
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      <h4 className="text-uppercase text-center">Login</h4>
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    )
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    const errorMessages = this.props.login.get('errorMessages');
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    return (
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      <div>
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        <Navbar history={this.props.history} />
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        <Grid fluid>
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          <Row>
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            <Col md={6} mdOffset={3}>
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              <Panel header={ panelHeader } className="panel-login">
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                <form>
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                  <FormGroup validationState={ errorMessages && errorMessages.has('username') ? 'error' : null }>
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                    <ControlLabel>Username</ControlLabel>
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                    <FormControl componentClass="input" type="text" inputRef={ref => { this.username = ref; }} />
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                    { this.renderErrorMessage(errorMessages, 'username') }
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                  </FormGroup>
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                  <FormGroup validationState={ errorMessages && errorMessages.has('password') ? 'error' : null }>
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                    <ControlLabel>Password</ControlLabel>
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                    <FormControl componentClass="input" type="password" inputRef={ref => { this.password = ref; }} />
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                    { this.renderErrorMessage(errorMessages, 'password') }
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                  </FormGroup>
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                  { this.renderNonFieldErrors(errorMessages) }
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                  <Button block bsStyle="primary" onClick={this.login}>Login</Button>
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                </form>
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              </Panel>
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              <p className="text-center">
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                <a className="text-muted" href="/register" onClick={ this.onClickRegister }>Not registered yet? Create an account.</a>
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              </p>
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            </Col>
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          </Row>
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        </Grid>
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      </div>
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    );
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  }
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}
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function mapStateToProps(state, props) {
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  return {
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    login: state['login']
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  };
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}
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function mapDispatchToProps(dispatch) {
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  return {
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    authActions: bindActionCreators(authActions, dispatch)
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  }
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}
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export default connect(mapStateToProps, mapDispatchToProps)(Login);