在嵌套对象中，在React with Hooks中更新状态的正确方法是什么?
export Example = () => {
const [exampleState, setExampleState] = useState(
{masterField: {
fieldOne: "a",
fieldTwo: {
fieldTwoOne: "b"
fieldTwoTwo: "c"
}
}
})
如何使用setExampleState将exampleState更新为a(附加字段)?
const a = {
masterField: {
fieldOne: "a",
fieldTwo: {
fieldTwoOne: "b",
fieldTwoTwo: "c"
}
},
masterField2: {
fieldOne: "c",
fieldTwo: {
fieldTwoOne: "d",
fieldTwoTwo: "e"
}
},
}
}
b(改变值)?
const b = {masterField: {
fieldOne: "e",
fieldTwo: {
fieldTwoOne: "f"
fieldTwoTwo: "g"
}
}
})
你想要创建状态的对象
let teams = {
team: [
{
name: "one",
id: "1"
},
]
}
使团队的状态为对象
const [state, setState] = useState(teams);
像这样更新状态
setState((prevState)=>({...prevState,team:[
...prevState.team,
{
name: "two",
id: "2"
}
]}))
更新后状态变为
{
team: [
{
name: "one",
id: "1"
},
{
name: "two",
id: "2"
}
]
}
要渲染项目根据当前状态使用地图功能
{state.team.map((curr_team) => {
return (
<div>
<p>{curr_team.id}</p>
<p>{curr_team.name}</p>
</div>
)
})}
我迟到了。：）
@aseferov回答在意图是重新进入整个对象结构时非常有效。然而，如果目标/目标是更新Object中的特定字段值，我认为下面的方法更好。
情境:
const [infoData, setInfoData] = useState({
major: {
name: "John Doe",
age: "24",
sex: "M",
},
minor:{
id: 4,
collegeRegion: "south",
}
});
更新特定的记录需要回调到之前的状态prevState
在这里:
setInfoData((prevState) => ({
...prevState,
major: {
...prevState.major,
name: "Tan Long",
}
}));
也许
setInfoData((prevState) => ({
...prevState,
major: {
...prevState.major,
name: "Tan Long",
},
minor: {
...prevState.minor,
collegeRegion: "northEast"
}));
我希望这对试图解决类似问题的人有所帮助。
最初我在useState中使用object，但后来我移动到useReducer钩子用于复杂的情况。重构代码时，我感到性能有所提高。
当您有涉及多个子值的复杂状态逻辑时，或者当下一个状态依赖于前一个状态时，useReducer通常比useState更可取。
useReducer React文档
我已经实现了这样的钩子供我自己使用:
/**
* Same as useObjectState but uses useReducer instead of useState
* (better performance for complex cases)
* @param {*} PropsWithDefaultValues object with all needed props
* and their initial value
* @returns [state, setProp] state - the state object, setProp - dispatch
* changes one (given prop name & prop value) or multiple props (given an
* object { prop: value, ...}) in object state
*/
export function useObjectReducer(PropsWithDefaultValues) {
const [state, dispatch] = useReducer(reducer, PropsWithDefaultValues);
//newFieldsVal={[field_name]: [field_value], ...}
function reducer(state, newFieldsVal) {
return { ...state, ...newFieldsVal };
}
return [
state,
(newFieldsVal, newVal) => {
if (typeof newVal !== "undefined") {
const tmp = {};
tmp[newFieldsVal] = newVal;
dispatch(tmp);
} else {
dispatch(newFieldsVal);
}
},
];
}
更多相关的钩子。
function App() {
const [todos, setTodos] = useState([
{ id: 1, title: "Selectus aut autem", completed: false },
{ id: 2, title: "Luis ut nam facilis et officia qui", completed: false },
{ id: 3, title: "Fugiat veniam minus", completed: false },
{ id: 4, title: "Aet porro tempora", completed: true },
{ id: 5, title: "Laboriosam mollitia et enim quasi", completed: false }
]);
const changeInput = (e) => {todos.map(items => items.id === parseInt(e.target.value) && (items.completed = e.target.checked));
setTodos([...todos], todos);}
return (
<div className="container">
{todos.map(items => {
return (
<div key={items.id}>
<label>
<input type="checkbox"
onChange={changeInput}
value={items.id}
checked={items.completed} /> {items.title}</label>
</div>
)
})}
</div>
);
}
谢谢Philip，这帮助了我-我的用例是我有一个有很多输入字段的表单，所以我保持初始状态为对象，我不能更新对象状态。上面的帖子帮助了我:)
const [projectGroupDetails, setProjectGroupDetails] = useState({
"projectGroupId": "",
"projectGroup": "DDD",
"project-id": "",
"appd-ui": "",
"appd-node": ""
});
const inputGroupChangeHandler = (event) => {
setProjectGroupDetails((prevState) => ({
...prevState,
[event.target.id]: event.target.value
}));
}
<Input
id="projectGroupId"
labelText="Project Group Id"
value={projectGroupDetails.projectGroupId}
onChange={inputGroupChangeHandler}
/>
