Example: Todo List

This is the complete source code of the tiny todo app we built during the basics tutorial.

Entry Point

index.js

import React from 'react';
import { createStore } from 'redux';
import { Provider } from 'react-redux';
import App from './containers/App';
import todoApp from './reducers';

let store = createStore(todoApp);

let rootElement = document.getElementById('root');
React.render(
  // The child must be wrapped in a function
  // to work around an issue in React 0.13.
  <Provider store={store}>
    {() => <App />}
  </Provider>,
  rootElement
);

Action Creators and Constants

actions.js

/*
 * action types
 */

export const ADD_TODO = 'ADD_TODO';
export const COMPLETE_TODO = 'COMPLETE_TODO';
export const SET_VISIBILITY_FILTER = 'SET_VISIBILITY_FILTER';

/*
 * other constants
 */

export const VisibilityFilters = {
  SHOW_ALL: 'SHOW_ALL',
  SHOW_COMPLETED: 'SHOW_COMPLETED',
  SHOW_ACTIVE: 'SHOW_ACTIVE'
};

/*
 * action creators
 */

export function addTodo(text) {
  return { type: ADD_TODO, text };
}

export function completeTodo(index) {
  return { type: COMPLETE_TODO, index };
}

export function setVisibilityFilter(filter) {
  return { type: SET_VISIBILITY_FILTER, filter };
}

Reducers

reducers.js

import { combineReducers } from 'redux';
import { ADD_TODO, COMPLETE_TODO, SET_VISIBILITY_FILTER, VisibilityFilters } from './actions';
const { SHOW_ALL } = VisibilityFilters;

function visibilityFilter(state = SHOW_ALL, action) {
  switch (action.type) {
  case SET_VISIBILITY_FILTER:
    return action.filter;
  default:
    return state;
  }
}

function todos(state = [], action) {
  switch (action.type) {
  case ADD_TODO:
    return [...state, {
      text: action.text,
      completed: false
    }];
  case COMPLETE_TODO:
    return [
      ...state.slice(0, action.index),
      Object.assign({}, state[action.index], {
        completed: true
      }),
      ...state.slice(action.index + 1)
    ];
  default:
    return state;
  }
}

const todoApp = combineReducers({
  visibilityFilter,
  todos
});

export default todoApp;

Smart Components

containers/App.js

import React, { Component, PropTypes } from 'react';
import { connect } from 'react-redux';
import { addTodo, completeTodo, setVisibilityFilter, VisibilityFilters } from '../actions';
import AddTodo from '../components/AddTodo';
import TodoList from '../components/TodoList';
import Footer from '../components/Footer';

class App extends Component {
  render() {
    // Injected by connect() call:
    const { dispatch, visibleTodos, visibilityFilter } = this.props;
    return (
      <div>
        <AddTodo
          onAddClick={text =>
            dispatch(addTodo(text))
          } />
        <TodoList
          todos={visibleTodos}
          onTodoClick={index =>
            dispatch(completeTodo(index))
          } />
        <Footer
          filter={visibilityFilter}
          onFilterChange={nextFilter =>
            dispatch(setVisibilityFilter(nextFilter))
          } />
      </div>
    );
  }
}

App.propTypes = {
  visibleTodos: PropTypes.arrayOf(PropTypes.shape({
    text: PropTypes.string.isRequired,
    completed: PropTypes.bool.isRequired
  })),
  visibilityFilter: PropTypes.oneOf([
    'SHOW_ALL',
    'SHOW_COMPLETED',
    'SHOW_ACTIVE'
  ]).isRequired
};

function selectTodos(todos, filter) {
  switch (filter) {
  case VisibilityFilters.SHOW_ALL:
    return todos;
  case VisibilityFilters.SHOW_COMPLETED:
    return todos.filter(todo => todo.completed);
  case VisibilityFilters.SHOW_ACTIVE:
    return todos.filter(todo => !todo.completed);
  }
}

// Which props do we want to inject, given the global state?
// Note: use https://github.com/faassen/reselect for better performance.
function select(state) {
  return {
    visibleTodos: selectTodos(state.todos, state.visibilityFilter),
    visibilityFilter: state.visibilityFilter
  };
}

// Wrap the component to inject dispatch and state into it
export default connect(select)(App);

Dumb Components

components/AddTodo.js

import React, { findDOMNode, Component, PropTypes } from 'react';

export default class AddTodo extends Component {
  render() {
    return (
      <div>
        <input type='text' ref='input' />
        <button onClick={(e) => this.handleClick(e)}>
          Add
        </button>
      </div>
    );
  }

  handleClick(e) {
    const node = findDOMNode(this.refs.input);
    const text = node.value.trim();
    this.props.onAddClick(text);
    node.value = '';
  }
}

AddTodo.propTypes = {
  onAddClick: PropTypes.func.isRequired
};

components/Footer.js

import React, { Component, PropTypes } from 'react';

export default class Footer extends Component {
  renderFilter(filter, name) {
    if (filter === this.props.filter) {
      return name;
    }

    return (
      <a href='#' onClick={e => {
        e.preventDefault();
        this.props.onFilterChange(filter);
      }}>
        {name}
      </a>
    );
  }

  render() {
    return (
      <p>
        Show:
        {' '}
        {this.renderFilter('SHOW_ALL', 'All')}
        {', '}
        {this.renderFilter('SHOW_COMPLETED', 'Completed')}
        {', '}
        {this.renderFilter('SHOW_ACTIVE', 'Active')}
        .
      </p>
    );
  }
}

Footer.propTypes = {
  onFilterChange: PropTypes.func.isRequired,
  filter: PropTypes.oneOf([
    'SHOW_ALL',
    'SHOW_COMPLETED',
    'SHOW_ACTIVE'
  ]).isRequired
};

components/Todo.js

import React, { Component, PropTypes } from 'react';

export default class Todo extends Component {
  render() {
    return (
      <li
        onClick={this.props.onClick}
        style={{
          textDecoration: this.props.completed ? 'line-through' : 'none',
          cursor: this.props.completed ? 'default' : 'pointer'
        }}>
        {this.props.text}
      </li>
    );
  }
}

Todo.propTypes = {
  onClick: PropTypes.func.isRequired,
  text: PropTypes.string.isRequired,
  completed: PropTypes.bool.isRequired
};

components/TodoList.js

import React, { Component, PropTypes } from 'react';
import Todo from './Todo';

export default class TodoList extends Component {
  render() {
    return (
      <ul>
        {this.props.todos.map((todo, index) =>
          <Todo {...todo}
                key={index}
                onClick={() => this.props.onTodoClick(index)} />
        )}
      </ul>
    );
  }
}

TodoList.propTypes = {
  onTodoClick: PropTypes.func.isRequired,
  todos: PropTypes.arrayOf(PropTypes.shape({
    text: PropTypes.string.isRequired,
    completed: PropTypes.bool.isRequired
  }).isRequired).isRequired
};