我如何使用嵌套的对象数组渲染复选框

Question

我有一个呈现多天复选框的复选框组件。我需要打印所选复选框的值。下面给出的示例如下所示：

const [state, setState] = useState({ 
    "firstName": "",
    "lastName" : "",
    "mobileNumber" : "",
    "avalabilities": [{"availabilityId": "",

    day: [
      {
        value: "sun",
        name: "Sunday"
      },
      {
        value: "mon",
        name: "Monday"
      },
      {
        value: "tue",
        name: "Tuesday"
      },
      {
        value: "wed",
        name: "Wednesday"
      },
      {
        value: "thur",
        name: "Thursday"
      },
      {
        value: "fri",
        name: "Friday"
      },
      {
        value: "sat",
        name: "Saturday"
      }
    ],
    "isChecked": false,
    "checked" : false,
    "allChecked": false,
    "error": null});

这是下面给出的控制台值

{firstName: '', lastName: '', mobileNumber: '', avalabilities: Array(1), …}
allChecked: false
avalabilities: Array(1)
0:
availabilityId: ""
day: (7) [{…}, {…}, {…}, {…}, {…}, {…}, {…}]
[[Prototype]]: Object
length: 1
[[Prototype]]: Array(0)
close: false
disabled: false
error: null
firstName: ""
isChecked: false
isPending: false
lastName: ""
mobileNumber: ""
open: false

这就是我尝试渲染数组的方式

{(avalabilities ||  [{}]).map((av, index) => {
    return (
      <div key={av.availabilityId}>


<>
            {av.day.map((item) => {
              return (
                <div>
                  <input
                    checked={item.checked || false}
                    onChange={() => handleChange3(item.value)}
                    type="checkbox"
                  />
                </div>
              );
            })}
          </>

但是日数组映射的错误如下所示

are not valid as a React child (found: object with keys {value, name}). If you meant to render a collection of children, use an array instead.

const checkedHandler = (event) => {
        
        setState(...)
        
        //Well, here I don't know how change the particular value of the 
     array...}

非常感谢任何帮助。

Answer 1

如果我是对的，您希望显示每个复选框的值并在我们切换任何复选框时保存相应的复选框值。您有 avalabilities 数组，并且在每个对象中我们都有另一个 day 数组。我渲染所有 avalabilities。现在，当我切换任何复选框时，我将三件事传递给 checkHandler:

e 是复选框的原生事件
avIndex 这是 avalabilities 数组
index 这是天数组中对象的索引。

现在每天对象，我设置一个键 checked 并通过从 e.target.checked.

获取值来存储该复选框的值

希望这能解决您的问题

newState.avalabilities[avIndex].day[index].checked = e.target.checked;

import { useState } from 'react';

export default function App() {
    const [state, setState] = useState({
        firstName: '',
        lastName: '',
        mobileNumber: '',
        avalabilities: [
            {
                availabilityId: '',
                day: [
                    { value: 'sun', name: 'Sunday' },
                    { value: 'mon', name: 'Monday' },
                    { value: 'tue', name: 'Tuesday' },
                    { value: 'wed', name: 'Wednesday' },
                    { value: 'thur', name: 'Thursday' },
                    { value: 'fri', name: 'Friday' },
                    { value: 'sat', name: 'Saturday' }
                ],
                isChecked: false,
                checked: false,
                allChecked: false,
                error: null
            }
        ]
    });

    const checkedHandler = (e, avIndex, index) => {
        console.log(e.target.checked, avIndex, index);
        setState((prev) => {
            let newState = { ...prev };
            newState.avalabilities[avIndex].day[index].checked = e.target.checked;
            return newState;
        });
    };

    return (
        <>
            {state.avalabilities.map((av, avIndex) => (
                <div key={av.availabilityId}>
                    {av.day.map((item, index) => (
                        <div key={index}>
                            <input
                                checked={item?.checked || false}
                                onChange={(e) => checkedHandler(e, avIndex, index)}
                                type='checkbox'
                            />
                            <span>{item.name}</span>
                        </div>
                    ))}
                </div>
            ))}
        </>
    );
}

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