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Redux 19: react todo list example (filtering a todo)
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<div id="root"></div> | |
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const todo = (state, action) => { | |
switch (action.type) { | |
case 'ADD_TODO': | |
return { | |
id: action.id, | |
text: action.text, | |
completed: false | |
}; | |
case 'TOGGLE_TODO': | |
if(state.id !== action.id) { | |
return state; | |
} | |
//...state doesn't work? | |
return Object.assign({}, state, | |
{completed: !state.completed} | |
); | |
default: | |
return state; | |
} | |
} | |
const todos = (state=[], action) => { | |
switch (action.type) { | |
case 'ADD_TODO': | |
return [ | |
...state, | |
todo(undefined, action) | |
]; | |
case 'TOGGLE_TODO': | |
return state.map(t => todo(t, action)); | |
default: | |
return state; | |
} | |
}; | |
const visibilityFilter = ( | |
state = "SHOW_ALL", action) => { | |
switch (action.type) { | |
case 'SET_VISIBILITY_FILTER': | |
return action.filter; | |
default: | |
return state; | |
} | |
}; | |
const { combineReducers } = Redux; | |
const todoApp = combineReducers({ | |
todos, | |
visibilityFilter | |
}); | |
const {createStore} = Redux; | |
const store = createStore(todoApp); | |
const { Component } = React; | |
const FilterLink = ({ | |
filter, | |
currentFilter, | |
children | |
}) => { | |
if (filter === currentFilter) { | |
return <span>{children}</span> | |
} | |
return ( | |
<a href='#' | |
onClick={e => { | |
e.preventDefault(); | |
store.dispatch({ | |
type: 'SET_VISIBILITY_FILTER', | |
filter | |
}); | |
}} | |
> | |
{children} | |
</a> | |
); | |
} | |
const getVisibleTodos = ( | |
todos, | |
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 | |
); | |
} | |
} | |
let nextTodoId = 0; | |
class TodoApp extends Component { | |
render() { | |
const { | |
todos, | |
visibilityFilter | |
} = this.props; | |
const visibleTodos = getVisibleTodos( | |
todos, | |
visibilityFilter | |
); | |
return ( | |
<div> | |
<input ref = {node => { | |
this.input = node; | |
}} /> | |
<button onClick={() => { | |
store.dispatch({ | |
type: 'ADD_TODO', | |
text: this.input.value, | |
id: nextTodoId++ | |
}); | |
this.input.value = ''; | |
}}> | |
Add Todo | |
</button> | |
<ul> | |
{visibleTodos.map(todo => | |
<li key={todo.id} | |
onClick={() => { | |
store.dispatch({ | |
type: 'TOGGLE_TODO', | |
id: todo.id | |
}); | |
}} | |
style={{ | |
textDecoration: | |
todo.completed ? | |
'line-through' : | |
'none' | |
}}> | |
{todo.text} | |
</li> | |
)} | |
</ul> | |
show: | |
{' '} | |
<FilterLink | |
filter='SHOW_ALL' | |
currentFilter={visibilityFilter} | |
> | |
All | |
</FilterLink> | |
{' '} | |
<FilterLink | |
filter='SHOW_ACTIVE' | |
currentFilter={visibilityFilter} | |
> | |
Active | |
</FilterLink> | |
{' '} | |
<FilterLink | |
filter='SHOW_COMPLETED' | |
currentFilter={visibilityFilter} | |
> | |
Completed | |
</FilterLink> | |
</div> | |
) | |
}; | |
} | |
const render = () => { | |
ReactDOM.render( | |
// Render the TodoApp Component to the <div> with id 'root' | |
<TodoApp | |
{...store.getState()} | |
/>, | |
document.getElementById('root') | |
) | |
}; | |
store.subscribe(render); | |
render(); |
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<script src="https://wzrd.in/standalone/expect@latest"></script> | |
<script src="https://wzrd.in/standalone/deep-freeze@lates"></script> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/redux/3.0.4/redux.js"></script> | |
<script src="https://unpkg.com/react@15/dist/react.min.js"></script> | |
<script src="https://unpkg.com/react-dom@15/dist/react-dom.min.js"></script> |
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