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"
}
}
})
我认为更优雅的解决方案是创建更新后的状态对象，同时保留以前的state值。需要更新的Object属性可以以这样的数组形式提供
import React,{useState, useEffect} from 'react'
export default function Home2(props) {
const [x, setX] = useState({name : '',add : {full : '', pin : '', d : { v : '' }}})
const handleClick = (e, type)=>{
let obj = {}
if(type.length > 1){
var z = {}
var z2 = x[type[0]]
type.forEach((val, idx)=>{
if(idx === type.length - 1){
z[val] = e.target.value
}
else if(idx > 0){
Object.assign(z , z2) /*{...z2 , [val]:{} }*/
z[val] = {}
z = z[val]
z2 = z2[val]
}else{
z = {...z2}
obj = z
}
})
}else obj = e.target.value
setX( { ...x , [type[0]] : obj } )
}
return (
<div>
<input value = {x.name} onChange={e=>handleClick(e,["name"])}/>
<input value = {x.add.full} onChange={e=>handleClick(e,["add","full"])} />
<input value = {x.add.pin} onChange={e=>handleClick(e,["add","pin"])} /><br/>
<input value = {x.add.d.v} onChange={e=>handleClick(e,["add","d","v"])} /><br/>
{x.name} <br/>
{x.add.full} <br/>
{x.add.pin} <br/>
{x.add.d.v}
</div>
)
}
我认为更优雅的解决方案是创建更新后的状态对象，同时保留以前的state值。需要更新的Object属性可以以这样的数组形式提供
import React,{useState, useEffect} from 'react'
export default function Home2(props) {
const [x, setX] = useState({name : '',add : {full : '', pin : '', d : { v : '' }}})
const handleClick = (e, type)=>{
let obj = {}
if(type.length > 1){
var z = {}
var z2 = x[type[0]]
type.forEach((val, idx)=>{
if(idx === type.length - 1){
z[val] = e.target.value
}
else if(idx > 0){
Object.assign(z , z2) /*{...z2 , [val]:{} }*/
z[val] = {}
z = z[val]
z2 = z2[val]
}else{
z = {...z2}
obj = z
}
})
}else obj = e.target.value
setX( { ...x , [type[0]] : obj } )
}
return (
<div>
<input value = {x.name} onChange={e=>handleClick(e,["name"])}/>
<input value = {x.add.full} onChange={e=>handleClick(e,["add","full"])} />
<input value = {x.add.pin} onChange={e=>handleClick(e,["add","pin"])} /><br/>
<input value = {x.add.d.v} onChange={e=>handleClick(e,["add","d","v"])} /><br/>
{x.name} <br/>
{x.add.full} <br/>
{x.add.pin} <br/>
{x.add.d.v}
</div>
)
}
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。
我给您留下了一个实用函数来不可变地更新对象
/**
* Inmutable update object
* @param {Object} oldObject Object to update
* @param {Object} updatedValues Object with new values
* @return {Object} New Object with updated values
*/
export const updateObject = (oldObject, updatedValues) => {
return {
...oldObject,
...updatedValues
};
};
你可以这样用
const MyComponent = props => {
const [orderForm, setOrderForm] = useState({
specialities: {
elementType: "select",
elementConfig: {
options: [],
label: "Specialities"
},
touched: false
}
});
// I want to update the options list, to fill a select element
// ---------- Update with fetched elements ---------- //
const updateSpecialitiesData = data => {
// Inmutably update elementConfig object. i.e label field is not modified
const updatedOptions = updateObject(
orderForm[formElementKey]["elementConfig"],
{
options: data
}
);
// Inmutably update the relevant element.
const updatedFormElement = updateObject(orderForm[formElementKey], {
touched: true,
elementConfig: updatedOptions
});
// Inmutably update the relevant element in the state.
const orderFormUpdated = updateObject(orderForm, {
[formElementKey]: updatedFormElement
});
setOrderForm(orderFormUpdated);
};
useEffect(() => {
// some code to fetch data
updateSpecialitiesData.current("specialities",fetchedData);
}, [updateSpecialitiesData]);
// More component code
}
如果没有，您可以在这里找到更多实用程序:https://es.reactjs.org/docs/update.html
