So I have this post method with Axios and if I submit this, it said
Uncaught (in promise) Error: Network Error at createError (createError.js:16) at XMLHttpRequest.handleError (xhr.js:87)
If I use this method:
axios.post('http://localhost:5000/users', ({userid: this.state.userid})
it works. But if I add 2 or more arg to the axios post it gets error again:
axios.post('http://localhost:5000/users', ({userid: this.state.userid}, {fullname: this.state.fullname} ))
Here is my full code. As you can see I try different combinations of code, and it only works if I only pass 1 arg.
import React from 'react';
import axios from 'axios';
// import { Form } from 'antd';
// import { List, Card, Form } from 'antd';
export default class FormUser extends React.Component {
// constructor(props) {
// super(props)
// this.state = {
state = {
userid: '',
fullname: '',
usergroup:'',
emailid: '',
mobile: '',
title: '',
};
handleChange = event => {
this.setState({ userid: event.target.value });
this.setState({ fullname: event.target.value });
this.setState({ usergroup: event.target.value });
this.setState({ emailid: event.target.value });
this.setState({ mobile: event.target.value });
this.setState({ title: event.target.value });
}
handleSubmit = event => {
event.preventDefault();
// const userform = {userid: this.state.userid};
// const fullnameForm = {fullname: this.state.fullname};
// const usergroupForm = {usergroup: this.state.usergroup};
// const emailidForm = {emailid: this.state.emailid};
// const mobileForm = {mobile: this.state.mobile};
// const titleForm = {title: this.state.title};
axios.post('http://localhost:5000/users', ({userid: this.state.userid}, {fullname: this.state.fullname} ))
// { {userid: this.state.userid}, {fullname: this.state.fullname} , usergroup: this.state.usergroup, emailid: this.state.emailid, mobile: this.state.mobile, title: this.state.title })
// { userform, fullnameForm, usergroupForm, emailidForm, mobileForm, titleForm })
.then(res => {
console.log(res);
console.log(res.data);
})
}
render() {
return (
<form onSubmit={this.handleSubmit}>
<label>User Project ID: <input type="text" name="userid" onChange={this.handleChange}/></label><br/>
<label>Full Name: <input type="text" name="fullname" onChange={this.handleChange}/></label><br/>
<label>User Group: <input type="text" name="usergroup" onChange={this.handleChange}/></label><br/>
<label>Email: <input type="text" name="emailid" onChange={this.handleChange}/></label><br/>
<label>Mobile: <input type="text" name="mobile" onChange={this.handleChange}/></label><br/>
<label>Title: <input type="text" name="title" onChange={this.handleChange}/></label>
<button type="submit">Add</button>
</form>
)
}
}
AXIOS POST on Express
app.post('/users', function (req, res) {
var postData = req.body;
// postData.created_at = new Date();
connection.query("INSERT INTO users SET ?", postData, function (error, results, fields) {
if (error) throw error;
console.log(results.insertId);
res.end(JSON.stringify(results));
});
});
eventHandler for each state. Is there any way I can do this better? yes it would work something like this
import React, { Component } from 'react';
class UserForm extends Component {
constructor() {
super();
this.state = {
fname: '',
lname: '',
email: '',
};
}
onChange = (e) => {
/*
Because we named the inputs to match their
corresponding values in state, it's
super easy to update the state
*/
this.setState({ [e.target.name]: e.target.value });
}
render() {
const { fname, lname, email } = this.state;
return (
<form>
<input
type="text"
name="fname"
value={fname}
onChange={this.onChange}
/>
<input
type="text"
name="lname"
value={lname}
onChange={this.onChange}
/>
<input
type="text"
name="email"
value={email}
onChange={this.onChange}
/>
</form>
);
}
}
and about submission of the form your axios post would work something like this
onSubmit = (e) => {
e.preventDefault();
// get our form data out of state
const { fname, lname, email } = this.state;
axios.post('/', { fname, lname, email })
.then((result) => {
//access the results here....
});
}
axios.post(url[, data[, config]])'s 3rd argument is the Axios configuration object, which you're inadvertently passing in in
axios.post('http://localhost:5000/users', ({userid: this.state.userid}, {fullname: this.state.fullname} ))
so the request gets misconfigured and doesn't work.
Instead, all of the data to POST should be in the single data object.
axios.post('http://localhost:5000/users', {
userid: this.state.userid,
fullname: this.state.fullname,
})
So apparently I have to add eventhandler for each state. Is there any way I can do this better?
import React from 'react';
import axios from 'axios';
import { Form } from 'antd';
// import { List, Card, Form } from 'antd';
const FormItem = Form.Item;
export default class FormUser extends React.Component {
// constructor(props) {
// super(props)
// this.state = {
state = {
userid: '',
fullname: '',
usergroup: '',
emailid: '',
mobile: '',
title: '',
};
handleUserIDChange = event => {this.setState({ userid: event.target.value })}
handleFullNameChange = event => {this.setState({ fullname: event.target.value })}
handleUserGroupChange = event => {this.setState({ usergroup: event.target.value })}
handleEmailIDChange = event => {this.setState({ emailid: event.target.value })}
handleMobileChange = event => {this.setState({ mobile: event.target.value })}
handleTitleChange = event => {this.setState({ title: event.target.value })}
handleSubmit = event => {
event.preventDefault();
// const userform = {userid: this.state.userid};
// const fullnameForm = {fullname: this.state.fullname};
// const usergroupForm = {usergroup: this.state.usergroup};
// const emailidForm = {emailid: this.state.emailid};
// const mobileForm = {mobile: this.state.mobile};
// const titleForm = {title: this.state.title};
axios.post('http://localhost:5000/users',
{ userid: this.state.userid, fullname: this.state.fullname, usergroup: this.state.usergroup, emailid: this.state.emailid, mobile: this.state.mobile, title: this.state.title },)
.then(res => {
console.log(res);
console.log(res.data);
})
}
render() {
return (
// const formItemLayout = {
// labelCol: {
// xs: { span: 24 },
// sm: { span: 8 },
// },
// wrapperCol: {
// xs: { span: 24 },
// sm: { span: 16},
// },
// };
<Form onSubmit={this.handleSubmit}>
<FormItem>
<label>User Project ID: <input type="text" name="this.state.userid" onChange={this.handleUserIDChange} /></label>
</FormItem>
<FormItem>
<label>Full Name: <input type="text" name="this.state.fullname" onChange={this.handleFullNameChange} /></label><br />
</FormItem>
<FormItem>
<label>User Group: <input type="text" name="this.state.usergroup" onChange={this.handleUserGroupChange} /></label><br />
</FormItem>
<FormItem>
<label>Email: <input type="text" name="this.state.emailid" onChange={this.handleEmailIDChange} /></label>
</FormItem>
<FormItem>
<label>Mobile: <input type="text" name="this.state.mobile" onChange={this.handleMobileChange} /></label>
</FormItem>
<FormItem>
<label>Title: <input type="text" name="this.state.title" onChange={this.handleTitleChange} /></label>
</FormItem>
<button type="submit">Add</button>
</Form>
)
}
}
来源：https://stackoverflow.com/questions/50617966/axios-post-form-with-reactjs