在 React 中构建待办事项应用程序，使用过滤器，但需要一种方法来确保"complete"按钮只删除一个任务而不是两个任务

Question

我刚开始学习react，所以我学习了本教程https://developer.mozilla.org/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_components创建一个todo应用程序，然后对其进行调整以适应我正在进行的项目的要求。一切都按照它应该的方式进行，除了当我从关联方删除(完成(东西时，它也会从我的主方删除它。我理解为什么会发生这种情况的一般概念(我的代码中没有两个单独的列表(，只是不知道如何在不删除现有过滤器的情况下进行修复。我曾试图为这些任务实现一个单独的列表，但就是不知道如何进行

添加CodeSandBox以获取更多上下文：https://codesandbox.io/s/hungry-sky-5f482?file=/src/index.js检查任务项目，然后查看您已签入的项目"；显示关联任务"问题是在关联方上完成任务；显示所有任务"一边

App.js

const FILTER_MAP = {
All: () => true,
Associate: task => task.checked 
};
const FILTER_NAMES = Object.keys(FILTER_MAP);
function App(props) {
const [tasks, setTasks] = useState(props.tasks);
const [filter, setFilter] = useState('All');
function toggleTaskChecked(id) {
const updatedTasks = tasks.map(task => {
if (id === task.id) {
return {...task, checked: !task.checked}
}
return task;
});
setTasks(updatedTasks);
}
function completeTask(id) {
const remainingTasks = tasks.filter(task => id !== task.id);
setTasks(remainingTasks);
}
const taskList = tasks
.filter(FILTER_MAP[filter])
.map(task => (
<Todo
id={task.id}
name={task.name}
checked={task.checked}
key={task.id}
toggleTaskChecked={toggleTaskChecked}
completeTask={completeTask}
/>
));
const filterList = FILTER_NAMES.map(name => (
<FilterButton
key={name}
name={name}
isPressed={name === filter}
setFilter={setFilter}
/>
));
function addTask(name) {
const newTask = { id: "todo-" + nanoid(), name: name, checked: false };
setTasks([...tasks, newTask]);
}
return (
<div className="app">
<h1 className = "tasks-header">Task Tracker</h1>
<Form addTask={addTask}/>
<div className="list-buttons">
{filterList}
</div>
<ul
role="list"
className="todo-list"
aria-labelledby="list-heading"
>
{taskList}
</ul>
</div>
);
}
export default App

Todo.js

export default function Todo(props) {
return (
<li className="todo stack-small">
<div className="c-cb">
<input id={props.id} 
type="checkbox" 
defaultChecked={props.checked}
onChange={() => props.toggleTaskChecked(props.id)} 
/>
<label className="todo-label" htmlFor="todo-0">
{props.name}
</label>
</div>
<div className="btn-group">
<button type="button" 
className="complete-button"
onClick={() => props.completeTask(props.id)}
>
Complete 
</button>
</div>
</li>
);
}

index.js

const DATA = [
{ id: "todo-0", name: "Brush Teeth", checked: false },
{ id: "todo-1", name: "Make Dinner", checked: false },
{ id: "todo-2", name: "Walk Dog", checked: false },
{ id: "todo-3", name: "Run Reports", checked: false },
{ id: "todo-4", name: "Visit Mom", checked: false },
{ id: "todo-5", name: "Aerobics", checked: false },
{ id: "todo-6", name: "Project", checked: false },
{ id: "todo-7", name: "Lecture", checked: false },
{ id: "todo-8", name: "Have Lunch", checked: false }
];
ReactDOM.render(
<React.StrictMode>
<App tasks={DATA}/>
</React.StrictMode>,
document.getElementById('root')
);

FilterButton.js

function FilterButton(props) {
return (
<button
type="button"
className="toggle-btn"
aria-pressed={props.isPressed}
onClick={() => props.setFilter(props.name)}
>
<span className="visually-hidden">Show </span>
<span>{props.name}</span>
<span className="visually-hidden"> Tasks</span>
</button>
);
}
export default FilterButton;

Answer 1

我们有3个布尔字段：checked、completed、completedAssoc。

{
id: "todo-0",
name: "Brush Teeth",
checked: false,
completed: false,
completedAssoc: false
},

过滤器的工作方式如下：

const FILTER_MAP = {
All: (task) => !task.completed,
Associate: (task) => task.checked && !task.completedAssoc
};

最后completeTask和addTask:的变化

function completeTask(id) {
const complField = filter === "All" ? "completed" : "completedAssoc";
const updatedTasks = tasks.map((task) =>
id === task.id ? { ...task, [complField]: true } : task
);
setTasks(updatedTasks);
}
function addTask(name) {
const newTask = {
id: "todo-" + nanoid(),
name: name,
checked: false,
completed: false,
completedAssoc: false
};
setTasks([...tasks, newTask]);
}