Skip to content

Instantly share code, notes, and snippets.

/index.html
Created Aug 18, 2016

Embed
What would you like to do?
JS Bin // source http://jsbin.com/tigakegijo
<!DOCTYPE html>
<html>
<head>
<script src="https://fb.me/react-15.3.0.min.js"></script>
<script src="https://fb.me/react-dom-15.3.0.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/redux/3.5.2/redux.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-redux/4.4.5/react-redux.js"></script>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<div id="root"></div>
<script id="jsbin-javascript">
/* global ReactRedux, Redux, ReactDOM */
////////////////////////////////////////////////
//
// Imports
//
'use strict';
var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };
function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) arr2[i] = arr[i]; return arr2; } else { return Array.from(arr); } }
var _ReactRedux = ReactRedux;
var connect = _ReactRedux.connect;
var Provider = _ReactRedux.Provider;
var _Redux = Redux;
var combineReducers = _Redux.combineReducers;
var createStore = _Redux.createStore;
////////////////////////////////////////////////
//
// Reducers (except root, see bottom)
//
// 2nd level reducer
// Here, `state` refers to the array of todo objects
var todos = function todos(state, action) {
if (state === undefined) state = [];
console.log("todos reducer called");
switch (action.type) {
// Returns a new array of todos, containing the added todo as described by `action`.
// The new todo is constructed by delegating to the `todo` reducer.
case 'ADD_TODO':
console.log('todos ADD_TODO');
// ... below is ES6 "spread operator" (arrays only)
return [].concat(_toConsumableArray(state), [todo(undefined, action)]);
// Returns a new array of todos, with an individual todo's completed status
// toggled as identified by `action.id`.
// Must operate on entire list (seems wrong somehow).
case 'TOGGLE_TODO':
console.log('todos TOGGLE_TODO');
return state.map(function (t) {
return todo(t, action);
});
default:
return state;
}
};
// 2nd level reducer
// Here, `state` refers to a simple configuration string (enum/atom)
// Remember, we are only returning the state we are concerned with
var visibilityFilter = function visibilityFilter(state, action) {
if (state === undefined) state = 'SHOW_ALL';
console.log("visibilityFilter reducer called");
switch (action.type) {
case 'SET_VISIBILITY_FILTER':
return action.filter;
default:
return state;
}
};
// 3rd level reducer.
// Here, `state` refers to a single todo object.
var todo = function todo(state, action) {
console.log("todo reducer called");
// Remember, no mutation.
// Initial state is considered (or not, in the ADD_TODO case),
// and used to construct a new state object, always.
switch (action.type) {
case 'ADD_TODO':
console.log('todo ADD_TODO');
return {
id: action.id,
text: action.text,
completed: false
};
case 'TOGGLE_TODO':
console.log('todo TOGGLE_TODO');
// Bail out if the action is for a different todo than the one passed in.
if (state.id !== action.id) {
return state;
}
// ... below is ES7 "Object Rest Destructuring"
// https://github.com/sebmarkbage/ecmascript-rest-spread/blob/master/Spread.md
// Think of it as "and the rest", or "override these object properties"
return _extends({}, state, {
completed: !state.completed
});
default:
return state;
}
};
////////////////////////////////////////////////
//
// React components
// (not including generated or root component/s)
//
// This is a "stateless component". It gets `props` passed in.
// https://facebook.github.io/react/blog/2015/09/10/react-v0.14-rc1.html#stateless-function-components
// Notice the curlybraces in the parameter list. This is destructuring
// `props` (e.g. filter = props.filter, children = props.children)
var TodoList = function TodoList(_ref) {
var todos = _ref.todos;
var onTodoClick = _ref.onTodoClick;
return React.createElement(
'ul',
null,
todos.map(function (todo) {
return React.createElement(Todo, _extends({
key: todo.id
}, todo, {
onClick: function () {
return onTodoClick(todo.id);
}
}));
})
);
};
var Todo = function Todo(_ref2) {
var onClick = _ref2.onClick;
var completed = _ref2.completed;
var text = _ref2.text;
return React.createElement(
'li',
{ onClick: onClick,
style: { textDecoration: completed ? 'line-through' : 'none' }
},
text
);
};
var Link = function Link(_ref3) {
var active = _ref3.active;
var children = _ref3.children;
var onClick = _ref3.onClick;
if (active) return React.createElement(
'span',
null,
children
);
return React.createElement(
'a',
{ href: '#',
onClick: function (e) {
e.preventDefault();
onClick();
}
},
children
);
};
var Footer = function Footer() {
return React.createElement(
'p',
null,
'Show:',
' ',
React.createElement(
FilterLink,
{
filter: 'SHOW_ALL' },
'All'
),
' ',
React.createElement(
FilterLink,
{
filter: 'SHOW_ACTIVE' },
'Active'
),
' ',
React.createElement(
FilterLink,
{ filter: 'SHOW_COMPLETED' },
'Completed'
)
);
};
// Intentionally not `const` here.
// We will override AddTodo later with a connected component.
var AddTodo = function AddTodo(_ref4) {
var dispatch = _ref4.dispatch;
var input = undefined;
return React.createElement(
'div',
null,
React.createElement('input', { ref: function (node) {
// This is a newer 0.14 syntax where ref can be a callback.
// n.b. no `this` available in a functional/stateless component.
// Here, we're making a closure over `input`, defined above.
input = node;
} }),
React.createElement(
'button',
{ onClick: function () {
dispatch(addTodo(input.value));
input.value = '';
} },
'Add todo'
)
);
};
////////////////////////////////////////////////
//
// react-redux mapping functions
//
// This takes Redux state, and returns the props needed
// for the presentational component.
var mapStateToTodoListProps = function mapStateToTodoListProps(state) {
console.log('mapStateToTodoListProps(): state.todos = ' + state.todos);
return {
todos: getVisibleTodos(state.todos, state.visibilityFilter)
};
};
// This takes the store's dispatch method, and returns the
// callbacks props needed for the presentational component.
var mapDispatchToTodoListProps = function mapDispatchToTodoListProps(dispatch) {
return {
onTodoClick: function onTodoClick(id) {
dispatch(toggleTodo(id));
}
};
};
var mapStateToFilterLinkProps = function mapStateToFilterLinkProps(state, ownProps) {
return {
active: ownProps.filter === state.visibilityFilter
};
};
var mapDispatchToFilterLinkProps = function mapDispatchToFilterLinkProps(dispatch, ownProps) {
return {
onClick: function onClick() {
console.log('FilterLink onClick');
dispatch(setVisibilityFilter(ownProps.filter));
}
};
};
////////////////////////////////////////////////
//
// react-redux container components generated by `connect`
//
// To create a container component, we use react-redux `connect`.
// We pass the mapStateToProps and mapDispatchToProps functions
// defined above.
//
// `connect` returns a curried function, which you call on the
// presentational component. *This* function returns a "connected"
// or "container" component.
//
// What is a connected component anyway?
//
// In the mapStateToProps function, we pluck any necessary state
// from the Redux store, and react-redux wires it to the React props.
//
// In the mapDispatchToProps function, we accept a callback to store.dispatch.
// We return an object, whose keys are callback attributes (`onClick` etc)
// and whose values are functions that actually perform dispatch.
//
// This allows us to take a stateless, dumb, presentation only component,
// and transform it into a component that knows how to get state from the store,
// and knows how to dispatch events to the store.
//
// The egghead redux video tutorials walk through how to implement `connect`
// by hand.
var VisibleTodoList = connect(mapStateToTodoListProps, mapDispatchToTodoListProps)(TodoList);
var FilterLink = connect(mapStateToFilterLinkProps, mapDispatchToFilterLinkProps)(Link);
// Default behavior of `connect` (with 0 parameters):
// Do not subscribe to any stores, inject `dispatch` as prop.
// This shorthand is equivalent to AddTodoHardWay, demonstrated below.
AddTodo = connect()(AddTodo);
// AddTodoTheHardWay = connect(
// state => {
// // AddToDo doesn't have any state to be mapped to props.
// // Could have just specified null here instead of an anon fn.
// return {};
// },
// dispatch => {
// // A bit hard to follow here.
// // The 2nd arg of `connect` is the mapDispatchToProps fn.
// // This function takes a dispatch function, returns callbacks as needed.
// // In other cases, we might return onSomethingClick callbacks here, calling
// // store.dispatch inside those callbacks as necessary.
// // In this case, we're just taking dispatch, and returning
// // {dispatch: dispatch}
//
// return { dispatch };
// }
// )(AddTodo);
////////////////////////////////////////////////
//
// Redux action creators
//
// You could just litter the action object boilerplate all throughout
// the code. This is just DRY/shorthand...
//
// ...but it's actually more than that.
// (?) Closures mean I can keep state
// (?) Async operations are handled here!
var nextToDoId = 0; // global :shrug:
var addTodo = function addTodo(text) {
return {
type: 'ADD_TODO',
id: nextToDoId++,
text: text
};
};
var setVisibilityFilter = function setVisibilityFilter(filter) {
return {
type: 'SET_VISIBILITY_FILTER',
filter: filter
};
};
var toggleTodo = function toggleTodo(id) {
return {
type: 'TOGGLE_TODO',
id: id
};
};
////////////////////////////////////////////////
//
// Helpers (just a filter, really)
//
var getVisibleTodos = function getVisibleTodos(todos, filter) {
console.log('getVisibleTodos: todos=' + todos + ' filter=' + filter);
switch (filter) {
case 'SHOW_ALL':
return todos;
case 'SHOW_COMPLETED':
return todos.filter(function (t) {
return t.completed;
});
case 'SHOW_ACTIVE':
return todos.filter(function (t) {
return !t.completed;
});
}
};
//////////////////////////////////////////////////
//
// Root reducer, root component, initial render
//
// Top level reducer.
var todoApp = combineReducers({
// n.b. following syntax is ES6 Object Initializer (shorthand property names)
todos: todos, // todos: todos,
visibilityFilter: visibilityFilter // visibilityFilter: visibilityFilter
});
// Create the Redux store from the root reducer.
var store = createStore(todoApp);
// Look at how simple the application is now!
// The top level React component needs no props.
var TodoApp = function TodoApp() {
return React.createElement(
'div',
null,
React.createElement(AddTodo, null),
React.createElement(VisibleTodoList, null),
React.createElement(Footer, null)
);
};
// react-redux <Provider> uses the React Context feature (`getChildContext`,
// `childContextTypes`) to inject the store, automatically subscribe and
// unsubscribe to it at the correct React lifecycle hooks (e.g. `componentDidMount`).
//
// See how <Provider> works here:
// https://github.com/rackt/react-redux/blob/master/src/components/Provider.js
ReactDOM.render(React.createElement(
Provider,
{ store: store },
React.createElement(TodoApp, null)
), document.getElementById('root'));
</script>
<script id="jsbin-source-javascript" type="text/javascript">/* global ReactRedux, Redux, ReactDOM */
////////////////////////////////////////////////
//
// Imports
//
const { connect, Provider } = ReactRedux;
const { combineReducers, createStore } = Redux;
////////////////////////////////////////////////
//
// Reducers (except root, see bottom)
//
// 2nd level reducer
// Here, `state` refers to the array of todo objects
const todos = (state = [], action) => {
console.log("todos reducer called");
switch (action.type) {
// Returns a new array of todos, containing the added todo as described by `action`.
// The new todo is constructed by delegating to the `todo` reducer.
case 'ADD_TODO':
console.log('todos ADD_TODO');
// ... below is ES6 "spread operator" (arrays only)
return [
...state,
todo(undefined, action)
];
// Returns a new array of todos, with an individual todo's completed status
// toggled as identified by `action.id`.
// Must operate on entire list (seems wrong somehow).
case 'TOGGLE_TODO':
console.log('todos TOGGLE_TODO');
return state.map(t =>
todo(t, action)
);
default:
return state;
}
};
// 2nd level reducer
// Here, `state` refers to a simple configuration string (enum/atom)
// Remember, we are only returning the state we are concerned with
const visibilityFilter = (state = 'SHOW_ALL', action) => {
console.log("visibilityFilter reducer called");
switch (action.type) {
case 'SET_VISIBILITY_FILTER':
return action.filter;
default:
return state;
}
};
// 3rd level reducer.
// Here, `state` refers to a single todo object.
const todo = (state, action) => {
console.log("todo reducer called");
// Remember, no mutation.
// Initial state is considered (or not, in the ADD_TODO case),
// and used to construct a new state object, always.
switch (action.type) {
case 'ADD_TODO':
console.log('todo ADD_TODO');
return {
id: action.id,
text: action.text,
completed: false
};
case 'TOGGLE_TODO':
console.log('todo TOGGLE_TODO');
// Bail out if the action is for a different todo than the one passed in.
if (state.id !== action.id) {
return state;
}
// ... below is ES7 "Object Rest Destructuring"
// https://github.com/sebmarkbage/ecmascript-rest-spread/blob/master/Spread.md
// Think of it as "and the rest", or "override these object properties"
return {
...state,
completed: !state.completed
};
default:
return state;
}
};
////////////////////////////////////////////////
//
// React components
// (not including generated or root component/s)
//
// This is a "stateless component". It gets `props` passed in.
// https://facebook.github.io/react/blog/2015/09/10/react-v0.14-rc1.html#stateless-function-components
// Notice the curlybraces in the parameter list. This is destructuring
// `props` (e.g. filter = props.filter, children = props.children)
const TodoList = ({ todos, onTodoClick }) => (
<ul>
{todos.map(todo =>
<Todo
key={todo.id}
{...todo}
onClick={() => onTodoClick(todo.id)}
/>
)}
</ul>
);
const Todo = ({ onClick, completed, text }) => {
return (
<li onClick={onClick}
style={{textDecoration: completed ? 'line-through' : 'none'}}
>
{text}
</li>
);
};
const Link = ({ active, children, onClick }) => {
if (active)
return <span>{children}</span>;
return (
<a href='#'
onClick={e => {
e.preventDefault();
onClick();
}}
>
{children}
</a>
);
};
const Footer = () => {
return (
<p>
Show:
{' '}
<FilterLink
filter='SHOW_ALL'>All</FilterLink>
{' '}
<FilterLink
filter='SHOW_ACTIVE'>Active</FilterLink>
{' '}
<FilterLink filter='SHOW_COMPLETED'>Completed</FilterLink>
</p>
);
};
// Intentionally not `const` here.
// We will override AddTodo later with a connected component.
let AddTodo = ({ dispatch }) => {
let input;
return (
<div>
<input ref={node => {
// This is a newer 0.14 syntax where ref can be a callback.
// n.b. no `this` available in a functional/stateless component.
// Here, we're making a closure over `input`, defined above.
input = node;
}} />
<button onClick={() => {
dispatch(addTodo(input.value));
input.value = '';
}}>
Add todo
</button>
</div>
);
};
////////////////////////////////////////////////
//
// react-redux mapping functions
//
// This takes Redux state, and returns the props needed
// for the presentational component.
const mapStateToTodoListProps = (state) => {
console.log(`mapStateToTodoListProps(): state.todos = ${state.todos}`);
return {
todos: getVisibleTodos(
state.todos,
state.visibilityFilter
)
};
};
// This takes the store's dispatch method, and returns the
// callbacks props needed for the presentational component.
const mapDispatchToTodoListProps = (dispatch) => {
return {
onTodoClick: (id) => {
dispatch(toggleTodo(id));
}
};
};
const mapStateToFilterLinkProps = (state, ownProps) => {
return {
active: ownProps.filter === state.visibilityFilter
};
};
const mapDispatchToFilterLinkProps = (dispatch, ownProps) => {
return {
onClick: () => {
console.log('FilterLink onClick');
dispatch(setVisibilityFilter(ownProps.filter));
}
};
};
////////////////////////////////////////////////
//
// react-redux container components generated by `connect`
//
// To create a container component, we use react-redux `connect`.
// We pass the mapStateToProps and mapDispatchToProps functions
// defined above.
//
// `connect` returns a curried function, which you call on the
// presentational component. *This* function returns a "connected"
// or "container" component.
//
// What is a connected component anyway?
//
// In the mapStateToProps function, we pluck any necessary state
// from the Redux store, and react-redux wires it to the React props.
//
// In the mapDispatchToProps function, we accept a callback to store.dispatch.
// We return an object, whose keys are callback attributes (`onClick` etc)
// and whose values are functions that actually perform dispatch.
//
// This allows us to take a stateless, dumb, presentation only component,
// and transform it into a component that knows how to get state from the store,
// and knows how to dispatch events to the store.
//
// The egghead redux video tutorials walk through how to implement `connect`
// by hand.
const VisibleTodoList = connect(
mapStateToTodoListProps, mapDispatchToTodoListProps
)(TodoList);
const FilterLink = connect(
mapStateToFilterLinkProps,
mapDispatchToFilterLinkProps
)(Link);
// Default behavior of `connect` (with 0 parameters):
// Do not subscribe to any stores, inject `dispatch` as prop.
// This shorthand is equivalent to AddTodoHardWay, demonstrated below.
AddTodo = connect()(AddTodo);
// AddTodoTheHardWay = connect(
// state => {
// // AddToDo doesn't have any state to be mapped to props.
// // Could have just specified null here instead of an anon fn.
// return {};
// },
// dispatch => {
// // A bit hard to follow here.
// // The 2nd arg of `connect` is the mapDispatchToProps fn.
// // This function takes a dispatch function, returns callbacks as needed.
// // In other cases, we might return onSomethingClick callbacks here, calling
// // store.dispatch inside those callbacks as necessary.
// // In this case, we're just taking dispatch, and returning
// // {dispatch: dispatch}
//
// return { dispatch };
// }
// )(AddTodo);
////////////////////////////////////////////////
//
// Redux action creators
//
// You could just litter the action object boilerplate all throughout
// the code. This is just DRY/shorthand...
//
// ...but it's actually more than that.
// (?) Closures mean I can keep state
// (?) Async operations are handled here!
let nextToDoId = 0; // global :shrug:
const addTodo = (text) => {
return {
type: 'ADD_TODO',
id: nextToDoId++,
text
};
};
const setVisibilityFilter = (filter) => {
return {
type: 'SET_VISIBILITY_FILTER',
filter
};
};
const toggleTodo = (id) => {
return {
type: 'TOGGLE_TODO',
id
};
};
////////////////////////////////////////////////
//
// Helpers (just a filter, really)
//
const getVisibleTodos = (todos, filter) => {
console.log(`getVisibleTodos: todos=${todos} filter=${filter}`);
switch (filter) {
case 'SHOW_ALL':
return todos;
case 'SHOW_COMPLETED':
return todos.filter(t => t.completed);
case 'SHOW_ACTIVE':
return todos.filter(t => !t.completed);
}
};
//////////////////////////////////////////////////
//
// Root reducer, root component, initial render
//
// Top level reducer.
const todoApp = combineReducers({
// n.b. following syntax is ES6 Object Initializer (shorthand property names)
todos, // todos: todos,
visibilityFilter // visibilityFilter: visibilityFilter
});
// Create the Redux store from the root reducer.
const store = createStore(todoApp);
// Look at how simple the application is now!
// The top level React component needs no props.
const TodoApp = () => {
return (
<div>
<AddTodo />
<VisibleTodoList />
<Footer />
</div>
);
};
// react-redux <Provider> uses the React Context feature (`getChildContext`,
// `childContextTypes`) to inject the store, automatically subscribe and
// unsubscribe to it at the correct React lifecycle hooks (e.g. `componentDidMount`).
//
// See how <Provider> works here:
// https://github.com/rackt/react-redux/blob/master/src/components/Provider.js
ReactDOM.render(
<Provider store={store}>
<TodoApp />
</Provider>,
document.getElementById('root')
);
</script></body>
</html>
/* global ReactRedux, Redux, ReactDOM */
////////////////////////////////////////////////
//
// Imports
//
'use strict';
var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };
function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) arr2[i] = arr[i]; return arr2; } else { return Array.from(arr); } }
var _ReactRedux = ReactRedux;
var connect = _ReactRedux.connect;
var Provider = _ReactRedux.Provider;
var _Redux = Redux;
var combineReducers = _Redux.combineReducers;
var createStore = _Redux.createStore;
////////////////////////////////////////////////
//
// Reducers (except root, see bottom)
//
// 2nd level reducer
// Here, `state` refers to the array of todo objects
var todos = function todos(state, action) {
if (state === undefined) state = [];
console.log("todos reducer called");
switch (action.type) {
// Returns a new array of todos, containing the added todo as described by `action`.
// The new todo is constructed by delegating to the `todo` reducer.
case 'ADD_TODO':
console.log('todos ADD_TODO');
// ... below is ES6 "spread operator" (arrays only)
return [].concat(_toConsumableArray(state), [todo(undefined, action)]);
// Returns a new array of todos, with an individual todo's completed status
// toggled as identified by `action.id`.
// Must operate on entire list (seems wrong somehow).
case 'TOGGLE_TODO':
console.log('todos TOGGLE_TODO');
return state.map(function (t) {
return todo(t, action);
});
default:
return state;
}
};
// 2nd level reducer
// Here, `state` refers to a simple configuration string (enum/atom)
// Remember, we are only returning the state we are concerned with
var visibilityFilter = function visibilityFilter(state, action) {
if (state === undefined) state = 'SHOW_ALL';
console.log("visibilityFilter reducer called");
switch (action.type) {
case 'SET_VISIBILITY_FILTER':
return action.filter;
default:
return state;
}
};
// 3rd level reducer.
// Here, `state` refers to a single todo object.
var todo = function todo(state, action) {
console.log("todo reducer called");
// Remember, no mutation.
// Initial state is considered (or not, in the ADD_TODO case),
// and used to construct a new state object, always.
switch (action.type) {
case 'ADD_TODO':
console.log('todo ADD_TODO');
return {
id: action.id,
text: action.text,
completed: false
};
case 'TOGGLE_TODO':
console.log('todo TOGGLE_TODO');
// Bail out if the action is for a different todo than the one passed in.
if (state.id !== action.id) {
return state;
}
// ... below is ES7 "Object Rest Destructuring"
// https://github.com/sebmarkbage/ecmascript-rest-spread/blob/master/Spread.md
// Think of it as "and the rest", or "override these object properties"
return _extends({}, state, {
completed: !state.completed
});
default:
return state;
}
};
////////////////////////////////////////////////
//
// React components
// (not including generated or root component/s)
//
// This is a "stateless component". It gets `props` passed in.
// https://facebook.github.io/react/blog/2015/09/10/react-v0.14-rc1.html#stateless-function-components
// Notice the curlybraces in the parameter list. This is destructuring
// `props` (e.g. filter = props.filter, children = props.children)
var TodoList = function TodoList(_ref) {
var todos = _ref.todos;
var onTodoClick = _ref.onTodoClick;
return React.createElement(
'ul',
null,
todos.map(function (todo) {
return React.createElement(Todo, _extends({
key: todo.id
}, todo, {
onClick: function () {
return onTodoClick(todo.id);
}
}));
})
);
};
var Todo = function Todo(_ref2) {
var onClick = _ref2.onClick;
var completed = _ref2.completed;
var text = _ref2.text;
return React.createElement(
'li',
{ onClick: onClick,
style: { textDecoration: completed ? 'line-through' : 'none' }
},
text
);
};
var Link = function Link(_ref3) {
var active = _ref3.active;
var children = _ref3.children;
var onClick = _ref3.onClick;
if (active) return React.createElement(
'span',
null,
children
);
return React.createElement(
'a',
{ href: '#',
onClick: function (e) {
e.preventDefault();
onClick();
}
},
children
);
};
var Footer = function Footer() {
return React.createElement(
'p',
null,
'Show:',
' ',
React.createElement(
FilterLink,
{
filter: 'SHOW_ALL' },
'All'
),
' ',
React.createElement(
FilterLink,
{
filter: 'SHOW_ACTIVE' },
'Active'
),
' ',
React.createElement(
FilterLink,
{ filter: 'SHOW_COMPLETED' },
'Completed'
)
);
};
// Intentionally not `const` here.
// We will override AddTodo later with a connected component.
var AddTodo = function AddTodo(_ref4) {
var dispatch = _ref4.dispatch;
var input = undefined;
return React.createElement(
'div',
null,
React.createElement('input', { ref: function (node) {
// This is a newer 0.14 syntax where ref can be a callback.
// n.b. no `this` available in a functional/stateless component.
// Here, we're making a closure over `input`, defined above.
input = node;
} }),
React.createElement(
'button',
{ onClick: function () {
dispatch(addTodo(input.value));
input.value = '';
} },
'Add todo'
)
);
};
////////////////////////////////////////////////
//
// react-redux mapping functions
//
// This takes Redux state, and returns the props needed
// for the presentational component.
var mapStateToTodoListProps = function mapStateToTodoListProps(state) {
console.log('mapStateToTodoListProps(): state.todos = ' + state.todos);
return {
todos: getVisibleTodos(state.todos, state.visibilityFilter)
};
};
// This takes the store's dispatch method, and returns the
// callbacks props needed for the presentational component.
var mapDispatchToTodoListProps = function mapDispatchToTodoListProps(dispatch) {
return {
onTodoClick: function onTodoClick(id) {
dispatch(toggleTodo(id));
}
};
};
var mapStateToFilterLinkProps = function mapStateToFilterLinkProps(state, ownProps) {
return {
active: ownProps.filter === state.visibilityFilter
};
};
var mapDispatchToFilterLinkProps = function mapDispatchToFilterLinkProps(dispatch, ownProps) {
return {
onClick: function onClick() {
console.log('FilterLink onClick');
dispatch(setVisibilityFilter(ownProps.filter));
}
};
};
////////////////////////////////////////////////
//
// react-redux container components generated by `connect`
//
// To create a container component, we use react-redux `connect`.
// We pass the mapStateToProps and mapDispatchToProps functions
// defined above.
//
// `connect` returns a curried function, which you call on the
// presentational component. *This* function returns a "connected"
// or "container" component.
//
// What is a connected component anyway?
//
// In the mapStateToProps function, we pluck any necessary state
// from the Redux store, and react-redux wires it to the React props.
//
// In the mapDispatchToProps function, we accept a callback to store.dispatch.
// We return an object, whose keys are callback attributes (`onClick` etc)
// and whose values are functions that actually perform dispatch.
//
// This allows us to take a stateless, dumb, presentation only component,
// and transform it into a component that knows how to get state from the store,
// and knows how to dispatch events to the store.
//
// The egghead redux video tutorials walk through how to implement `connect`
// by hand.
var VisibleTodoList = connect(mapStateToTodoListProps, mapDispatchToTodoListProps)(TodoList);
var FilterLink = connect(mapStateToFilterLinkProps, mapDispatchToFilterLinkProps)(Link);
// Default behavior of `connect` (with 0 parameters):
// Do not subscribe to any stores, inject `dispatch` as prop.
// This shorthand is equivalent to AddTodoHardWay, demonstrated below.
AddTodo = connect()(AddTodo);
// AddTodoTheHardWay = connect(
// state => {
// // AddToDo doesn't have any state to be mapped to props.
// // Could have just specified null here instead of an anon fn.
// return {};
// },
// dispatch => {
// // A bit hard to follow here.
// // The 2nd arg of `connect` is the mapDispatchToProps fn.
// // This function takes a dispatch function, returns callbacks as needed.
// // In other cases, we might return onSomethingClick callbacks here, calling
// // store.dispatch inside those callbacks as necessary.
// // In this case, we're just taking dispatch, and returning
// // {dispatch: dispatch}
//
// return { dispatch };
// }
// )(AddTodo);
////////////////////////////////////////////////
//
// Redux action creators
//
// You could just litter the action object boilerplate all throughout
// the code. This is just DRY/shorthand...
//
// ...but it's actually more than that.
// (?) Closures mean I can keep state
// (?) Async operations are handled here!
var nextToDoId = 0; // global :shrug:
var addTodo = function addTodo(text) {
return {
type: 'ADD_TODO',
id: nextToDoId++,
text: text
};
};
var setVisibilityFilter = function setVisibilityFilter(filter) {
return {
type: 'SET_VISIBILITY_FILTER',
filter: filter
};
};
var toggleTodo = function toggleTodo(id) {
return {
type: 'TOGGLE_TODO',
id: id
};
};
////////////////////////////////////////////////
//
// Helpers (just a filter, really)
//
var getVisibleTodos = function getVisibleTodos(todos, filter) {
console.log('getVisibleTodos: todos=' + todos + ' filter=' + filter);
switch (filter) {
case 'SHOW_ALL':
return todos;
case 'SHOW_COMPLETED':
return todos.filter(function (t) {
return t.completed;
});
case 'SHOW_ACTIVE':
return todos.filter(function (t) {
return !t.completed;
});
}
};
//////////////////////////////////////////////////
//
// Root reducer, root component, initial render
//
// Top level reducer.
var todoApp = combineReducers({
// n.b. following syntax is ES6 Object Initializer (shorthand property names)
todos: todos, // todos: todos,
visibilityFilter: visibilityFilter // visibilityFilter: visibilityFilter
});
// Create the Redux store from the root reducer.
var store = createStore(todoApp);
// Look at how simple the application is now!
// The top level React component needs no props.
var TodoApp = function TodoApp() {
return React.createElement(
'div',
null,
React.createElement(AddTodo, null),
React.createElement(VisibleTodoList, null),
React.createElement(Footer, null)
);
};
// react-redux <Provider> uses the React Context feature (`getChildContext`,
// `childContextTypes`) to inject the store, automatically subscribe and
// unsubscribe to it at the correct React lifecycle hooks (e.g. `componentDidMount`).
//
// See how <Provider> works here:
// https://github.com/rackt/react-redux/blob/master/src/components/Provider.js
ReactDOM.render(React.createElement(
Provider,
{ store: store },
React.createElement(TodoApp, null)
), document.getElementById('root'));
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.