我有两个按钮,一个是completedTasks
,另一个是incompleteTasks
所以当用户点击completedTasks
时,我想根据属性过滤状态数组。反之亦然。
但是,问题是在单击completedTasks
之后,我的状态数组变为仅completedTasks筛选值。这样,当我点击uncompetedTasks时,我就不会返回我的状态
这是我的两种方法:
const incompleteTasks = () => {
const tasks = todos.filter((todo) => todo.completed === false);
setTodos(tasks);
};
const completedTasks = () => {
const tasks = todos.filter((todo) => todo.completed === true);
setTodos(tasks);
};
如何修复此问题,使实际数组不被修改,只显示基于按钮单击的过滤属性。
-第一个解决方案可以使用一个状态来存储过滤器的状态
const [completed,setCompleted] = useState(null); //true , false
const incompleteTasks = () => setCompleted(false);
const completedTasks = () => setCompleted(true);
并使用filteredTodos显示
const filteredTodos = completed !==null ? todos.filter((todo) => todo.completed === completed):todos;
-第二个灵魂可以使用临时状态:
const [filteredTodos,setFilteredTodos] = useState([]);
const incompleteTasks = () => {
const tasks = todos.filter((todo) => todo.completed === false);
setFilteredTodos(tasks);
};
const completedTasks = () => {
const tasks = todos.filter((todo) => todo.completed === true);
setFilteredTodos(tasks);
};
然后在需要的位置显示filteredTodos。