<分区>
我在我的 React 网络应用程序中收到错误消息“‘$’未定义”。我使用 create-react-app 来初始化应用程序。我读到我需要将 jquery $ 导入我的应用程序，但我不需要将它用于我制作的另一个 React 应用程序。
问题来 self 在 _login() 函数中的行:
const email = $("#email").val()
const password = $("#password").val()
我使用模板文字从输入标签中获取电子邮件和密码的值。从使用 React 16.0 开始，我应该可以不用从 jQuery 导入 $，特别是如果我的其他项目不必这样做的话。
import React, {Component} from 'react';
import styled from 'styled-components';
import axios from 'axios';
const Container = styled.div`
width: 100%;
display: flex;
flex-direction: column;
align-items: center;
`;
class LoginScreen extends Component {
constructor(props){
super(props);
this.state ={
clients: [],
projects: [],
}
}
_login = () => {
const email = $("#email").val()
const password = $("#password").val()
const request = {"auth": {"email": email, "password": password}}
console.log(request)
axios.post('http://localhost:3000/api/user_token',
'auth': request
).then(response => {
console.log(response)
}).catch(error => console.log(error))
}
render(){
return(
<Container>
Login
<form>
<label>Email: </label>
<input
id="email"
name="email"
type="email"
/>
<label>Password: </label>
<input
id="password"
name="password"
type="password"
/>
</form>
<button
onClick={this._login}
>
Log In
</button>
</Container>
)
}
}
export default LoginScreen;
包.json
"dependencies": {
"@material-ui/core": "^1.1.0",
"axios": "^0.18.0",
"immutability-helper": "^2.7.0",
"react": "^16.3.2",
"react-dom": "^16.3.2",
"react-redux": "^5.0.7",
"react-router-dom": "^4.2.2",
"react-scripts": "1.1.4",
"styled-components": "^3.3.0"
},