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index.js
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index.js
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import React from 'react';
import {useRef} from 'react';
import { combineReducers } from './combinedReducers';
import { createStore } from './createStore';
import ReactDOM from 'react-dom';
import './index.css';
const ADD_TODO = "ADD_TODO";
const TOGGLE_TODO = "TOGGLE_TODO";
const SET_VISIBILITY_FILTER = 'SET_VISIBILITY_FILTER';
const SHOW_ALL = "SHOW_ALL";
const SHOW_ACTIVE = "SHOW_ACTIVE";
const SHOW_COMPLETED = "SHOW_COMPLETED";
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;
}
return {
...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 FilterLink = ({
filter,
children,
currentFilter,
onClick
}) => {
if(filter === currentFilter) return <span>{children}</span>
return (
<a
href='_'
onClick={e => {
e.preventDefault();
onClick(filter)
}}
>
{children}
</a>
)
};
const Footer = ({
visibilityFilter,
onFilterClick,
}) => (
<p>
Show:
<br />
<FilterLink filter={SHOW_ALL} currentFilter={visibilityFilter} onClick={onFilterClick}>{SHOW_ALL}</FilterLink>
<br />
<FilterLink filter={SHOW_ACTIVE} currentFilter={visibilityFilter} onClick={onFilterClick}>{SHOW_ACTIVE}</FilterLink>
<br />
<FilterLink filter={SHOW_COMPLETED} currentFilter={visibilityFilter} onClick={onFilterClick}>{SHOW_COMPLETED}</FilterLink>
</p>
);
const getVisibleTodos = (todos, filter) => {
switch(filter){
case SHOW_ACTIVE:
return todos.filter(todo => !todo.completed);
case SHOW_COMPLETED:
return todos.filter(todo => todo.completed);
default:
return todos;
}
}
const Todo = ({
onClick,
completed,
text
}) => (
<li
onClick={onClick}
>
{completed? <strike>{text}</strike> : text}
</li>
);
const TodoList = ({
todos,
onTodoClick,
}) => (
<ul>
{todos.map(todo =>
<Todo
key={todo.id}
{...todo}
onClick={() => onTodoClick(todo.id)}
/>
)}
</ul>
);
const AddTodo = ({
onAddClick
}) => {
const inputEl = useRef(null);
return (
<div>
<input ref={inputEl} type="text" />
<button onClick={() => {
if(inputEl.current.value !== ""){
onAddClick(inputEl.current.value);
inputEl.current.value="";
}
}}
>
Add Todo
</button>
</div>
);
}
let nextTodoId = 0;
const TodoApp = ({todos, visibilityFilter}) => {
const visibileTodos = getVisibleTodos(todos,visibilityFilter);
return(
<div>
<AddTodo
onAddClick={text => store.dispatch({
type: ADD_TODO,
id: nextTodoId++,
text
})}
/>
<TodoList todos={visibileTodos}
onTodoClick={id => store.dispatch({
type: TOGGLE_TODO,
id
})}
/>
<Footer
visibilityFilter={visibilityFilter}
onFilterClick={filter => store.dispatch({
type: SET_VISIBILITY_FILTER,
filter
})}
/>
</div>
)};
const todoApp = combineReducers({todos,visibilityFilter});
const store = createStore(todoApp);
const render = () => ReactDOM.render(
<React.StrictMode>
<TodoApp
todos={store.getState().todos}
visibilityFilter={store.getState().visibilityFilter}
/>
</React.StrictMode>,
document.getElementById('root')
);
store.subscribe(render);
render();