lovecoding
/
VIP20


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269
							<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>代办事项</title>
    <script src="./babel.min.js"></script>
    <script src="./react.development.js"></script>
    <script src="./react-dom.development.js"></script>
    <link rel="stylesheet" href="./index.css" />
  </head>
  <body>
    <div id="root"></div>
    <script type="text/babel">
      function App() {
        return (
          <>
            <TodoApp />
          </>
        );
      }

      class TodoApp extends React.Component {
        constructor() {
          super();
          this.state = {
            todos: [
              {
                id: 1,
                title: '吃饭',
                completed: false,
              },
              {
                id: 2,
                title: '睡觉',
                completed: true,
              },
            ], // 所有代办, 默认值 为 []
            filters: 'all', // 过滤条件 值为 "all | active | completed", 默认值 all
          };

          this.clearCompletedTodos = this.clearCompletedTodos.bind(this);
          this.removeTodoById = this.removeTodoById.bind(this);
          this.toggleTodoStatus = this.toggleTodoStatus.bind(this);
        }

        toggleTodoStatus(id) {
          this.setState(({ todos }) => {
            for (var i = 0, l = todos.length; i < l; i++) {
              if (todos[i].id === id) {
                todos[i].completed = !todos[i].completed;
                break;
              }
            }

            return {
              todos,
            };
          });
        }

        removeTodoById(id) {
          if (!confirm('确定删除当前代办吗？')) return;

          this.setState((prevState) => ({
            todos: prevState.todos.filter((todo) => todo.id !== id),
          }));
        }

        clearCompletedTodos() {
          if (!confirm('确定清楚所有已完成的代办吗？')) return;

          this.setState((prevState) => ({
            todos: prevState.todos.filter((todo) => !todo.completed),
          }));
        }

        setFilters(text) {
          this.setState({
            filters: text,
          });
        }

        addTodo(title) {
          // 注意：this 必须是 组件实例
          this.setState((prevState) => ({
            todos: [
              ...prevState.todos,
              { id: Date.now(), title, completed: false },
            ],
          }));
        }

        toggleAllTodoStatus(completed) {
          // 注意：this 必须是 组件实例
          this.setState((prevState) => ({
            todos: prevState.todos.map((todo) => {
              todo.completed = completed;
              return todo;
            }),
          }));
        }

        calcUndoneTodoCount() {
          return this.state.todos.filter((todo) => !todo.completed).length;
        }

        // 根据filters，todos得到过滤后的代办数组
        renderTodos() {
          let { todos, filters } = this.state;
          if (filters === 'all') return todos;

          // return todos.filter((todo) =>
          //   filters === 'active'
          //     ? todo.completed === false
          //     : todo.completed === true
          // );

          return todos.filter((todo) =>
            filters === 'active' ? !todo.completed : todo.completed
          );
        }

        render() {
          // console.log(`output->render`);
          return (
            <section className="todoapp">
              <TodoHeader addTodo={this.addTodo.bind(this)} />
              <TodoMain
                todos={this.renderTodos()}
                toggleAll={this.toggleAllTodoStatus.bind(this)}
                remove={this.removeTodoById}
                toggle={this.toggleTodoStatus}
              />
              <TodoFooter
                undoneCount={this.calcUndoneTodoCount()}
                setFilters={this.setFilters.bind(this)}
                filter={this.state.filters}
                clear={this.clearCompletedTodos}
              />
            </section>
          );
        }
      }

      function TodoHeader({ addTodo }) {
        return (
          <header className="header">
            <h1>todos</h1>
            <input
              autoFocus="autofocus"
              autoComplete="off"
              placeholder="输入您要完成的任务?"
              className="new-todo"
              onKeyUp={(e) => {
                // 判断按下enter
                // console.log(`output->e`, e);
                if (e.which === 13) {
                  let title = e.target.value.trim();

                  if (!title) return alert('您输入的代办名称不合法！');

                  addTodo(title);
                  e.target.value = '';
                }
              }}
            />
          </header>
        );
      }
      function TodoMain({ todos, toggle, remove, toggleAll }) {
        return (
          <section className="main">
            <input
              id="toggle-all"
              type="checkbox"
              className="toggle-all"
              onChange={(e) => {
                toggleAll(e.target.checked);
              }}
            />
            <label htmlFor="toggle-all"></label>
            <ul className="todo-list">
              {todos &&
                todos.map((todo) => (
                  <TodoItem
                    key={todo.id}
                    todo={todo}
                    onRemove={remove}
                    onToggle={toggle}
                  />
                ))}
            </ul>
          </section>
        );
      }
      function TodoFooter({ undoneCount, setFilters, filter, clear }) {
        return (
          <footer className="footer">
            <span className="todo-count">
              <strong>{undoneCount}</strong> items left
            </span>
            <ul className="filters">
              <li>
                <a
                  href="#/all"
                  className={filter === 'all' ? 'selected' : ''}
                  onClick={() => {
                    setFilters('all');
                  }}
                >
                  All
                </a>
              </li>
              <li>
                <a
                  href="#/active"
                  className={filter === 'active' ? 'selected' : ''}
                  onClick={() => {
                    setFilters('active');
                  }}
                >
                  Active
                </a>
              </li>
              <li>
                <a
                  href="#/completed"
                  className={filter === 'completed' ? 'selected' : ''}
                  onClick={() => {
                    setFilters('completed');
                  }}
                >
                  Completed
                </a>
              </li>
            </ul>
            <button className="clear-completed" onClick={clear}>
              Clear completed
            </button>
          </footer>
        );
      }
      function TodoItem({ todo, onRemove, onToggle }) {
        return (
          <li className="todo">
            <div className="view">
              <input
                type="checkbox"
                className="toggle"
                checked={todo.completed}
                onChange={() => onToggle(todo.id)}
              />
              <label>{todo.title}</label>
              <button
                className="destroy"
                onClick={() => onRemove(todo.id)}
              ></button>
            </div>
          </li>
        );
      }

      const root = ReactDOM.createRoot(document.getElementById('root'));
      root.render(<App />);
    </script>
  </body>
</html>