如何在react类组件中发布一个对象

Question

这是我的CustomerBill.js

import React, { Component } from "react";
import "bootstrap/dist/css/bootstrap.min.css";
import axios from "axios";
import $ from "jquery";
import Box from "@mui/material/Box";
import Button from "@mui/material/Button";
import CustomerTable from "./table";
class CustomerBill extends Component {
constructor() {
super();
this.state = {
Customer: "",
customerTable: {
index: Math.random(),
id: "",
paymentDescription: "",
quantity: "",
unitPrice: "",
},
};
this.handleSubmit = this.handleSubmit.bind(this);
this.handleChange = this.handleChange.bind(this);
}
handleChange = (e) => {
if (
["id", "paymentDescription", "quantity", "unitPrice"].includes(
e.target.name
)
) {
let customerTable = { ...this.state.customerTable };
customerTable[e.target.dataset.id][e.target.name] = e.target.value;
} else {
this.setState({ [e.target.name]: e.target.value });
}
};
addNewRow = () => {
this.setState((prevState) => ({
customerTable: [
...prevState.taskList,
{
index: Math.random(),
id: "",
paymentDescription: "",
quantity: "",
unitPrice: "",
},
],
}));
};
clickOnDelete(record) {
this.setState({
customerTable: this.state.customerTable.filter((r) => r !== record),
});
}
handleSubmit(event) {
event.preventDefault();
const bill = {
Customer: this.state.customerTable,
};
axios
.post(`http://localhost:4000/customer/bill`, bill)
.then((response) => {
console.log(response.data);
return $(".alert-success").show();
});
this.setState({
Customer: "",
});
}
render() {
let { customerTable } = this.state;
return (
<div>
<div className="container">
<div className="form-div">
<h1>Customer Bill</h1>
<Box
component="form"
onSubmit={this.handleSubmit}
noValidate
sx={{ mt: 1 }}
onChange={this.handleChange}
>
<div className="row" style={{ marginTop: 20 }}>
<div className="col-sm-3"></div>
<div className="col-sm-12">
<div className="card">
<div className="card-header text-center">
Bill Description
</div>
<div className="card-body">
<div className="row">
<div className="col-sm-4"></div>
</div>
<table>
<thead>
<tr>
<th className="text-center"> sN </th>
<th className="text-center"> Id </th>
<th className="text-center">
Payment Description
</th>
<th className="text-center"> Quantity </th>
</tr>
</thead>
<tbody>
<CustomerTable
id="customerTable"
add={this.addNewRow.bind(this)}
delete={this.clickOnDelete.bind(this)}
customerTable={customerTable}
/>
</tbody>
</table>
</div>
</div>
</div>
<div className="col-sm-1"></div>
</div>
<Button type="submit" fullWidth sx={{ mt: 3, mb: 2 }}>
<span className="btn btn-warning btn-block form-control form-group">
Submit
</span>
</Button>
</Box>
</div>
</div>
</div>
);
}
}
export default CustomerBill;

table.js

import React from "react";
const CustomerTable = (props, val, idx, post) => {
return props.customerTable.map((val, idx, post) => {
let id = `id-${idx}`,
paymentDescription = `paymentDescription-${idx}`,
quantity = `quantity-${idx}`,
unitPrice = `unitPrice-${idx}`;
return (
<tr key={val.index}>
<td>
<input
type="text"
name="id"
data-id={idx}
id={id}
className="form-control "
/>
</td>
<td>
<input
type="text"
name="paymentDescription"
id={paymentDescription}
data-id={idx}
className="form-control "
/>
</td>
<td>
<input
type="text"
name="quantity"
id={quantity}
data-id={idx}
className="form-control"
/>
</td>
<td>
<input
type="text"
name="unitPrice"
id={unitPrice}
data-id={idx}
className="form-control"
/>
</td>
<td>
{idx === 0 ? (
<button
onClick={() => props.add()}
type="button"
className="btn btn-primary"
>
Add Row
</button>
) : (
<button
className="btn btn-danger"
onClick={() => props.delete(val)}
>
Delete Row
</button>
)}
</td>
</tr>
);
});
};
export default CustomerTable;

我试图将customerTable对象发布到Customer数组中。然而，我得到未捕获的TypeError props.customerTable.map不是一个函数。我如何改进这段代码，以便能够将数据推送到客户数组作为对象。提前感谢

Answer 1

你的customerTable prop被初始化为一个对象，而不是一个数组，所以你不能在它上面使用map。

你应该这样初始化它:

customerTable: [{
index: Math.random(),
id: "",
paymentDescription: "",
quantity: "",
unitPrice: "",
}],

Answer 2

尝试使用Object.values()

检查下面的例子:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_objects/Object/values