[英]How to export the value of useState hooks
我正在尝试在我的组件中使用“useState”挂钩来设置用户名和密码输入字段的值,然后将有效负载(用户名和密码的值)发送到与 redux 一起使用的减速器。
import React, { useEffect, useState } from "react";
import { connect } from "react-redux";
import {signUpUser} from "../SideBar/Redux"
import ReactDOM from "react-dom";
import { CSSTransition } from "react-transition-group";
import "./SignUp.css";
const SignUpModal = (props) => {
const closeOnEscapeKeyDown = e => {
if ((e.charCode || e.keyCode) === 27) {
props.modalClosed();
}
};
useEffect(() => {
document.body.addEventListener("keydown", closeOnEscapeKeyDown);
return function cleanup() {
document.body.removeEventListener("keydown", closeOnEscapeKeyDown);
};
}, []);
const [userNameInput, setUserNameInput] = useState("");
const [userPasswordInput, setUserPasswordInput] = useState("")
const userNameHandler = (e) => {
setUserNameInput(e.target.value)
}
const userPasswordHandler = (e) => {
setUserPasswordInput(e.target.value)
}
return ReactDOM.createPortal(
<CSSTransition
in={props.isSignupModalOpened}
unmountOnExit
timeout={{ enter: 0, exit: 300 }}
>
<div className="modal" onClick={props.modalClosed}>
<div className="modal-content" onClick={e => e.stopPropagation()}>
<div className="modal-header">
<h4 className="modal-title">Sign Up</h4>
</div>
<div className="modal-body">
<div className = "modal-input-field">
<div className = "modal-username-field">
<p className = "p-username">Username</p>
<input tag = "username"
placeholder = "eg: muhammet-aldulaimi"
onChange = {userNameHandler}
/>
</div>
<div className = "modal-password-field">
<p className = "p-password">Password</p>
<input tag = "password"
type = "password"
placeholder = "eg: someStrongPassword123"
onChange = {userPasswordHandler}
/>
</div>
</div>
<div className = "modal-submit">
<button onClick = {props.userInfoSubmitHandler}
className = "modal-submit-button">Submit
</button>
</div>
</div>
<div className="modal-footer">
<button className="button" onClick={props.modalClosed} >
Close
</button>
</div>
</div>
</div>
</CSSTransition>,
document.getElementById("root")
);
};
const mapStateToProps = (state) => {
return {
isModalOpen: state.isModalOpen,
isSignupModalOpened: state.isSignupModalOpened
}
}
const mapDispatchToProps = (dispatch) => {
return {
modalOpened : () => {
dispatch({type: "OPEN_MODAL"})
},
modalClosed : () => {
dispatch({type: "CLOSE_MODAL"})
},
userInfoSubmitHandler: () => {
console.log("reached prop successfully")
console.log(userNameValue, userPasswordValue)
dispatch(signUpUser({userName: userNameValue, userPassword: userPasswordValue}))
}
}
}
export default connect(mapStateToProps, mapDispatchToProps)(SignUpModal);
我尝试导出变量,不起作用。 将变量分配给另一个变量然后导出它是行不通的。 我还尝试将 state 变量作为 arguments 传递给我的 prop.userInfoSubmitHandler。 那也没用。 我不明白为什么这些变量在我的 userInfoSubmitHandler function 的 scope 中不可用。 有小费吗?
您可以尝试将 onclick 作为参数传递:
<button onClick={() => props.userInfoSubmitHandler(userNameInput, userPasswordInput)}
className = "modal-submit-button">Submit
</button>
我还看到您在 state 中没有任何名为 userNameValue 和 userPassworValue 的变量,变量名称不同吗?
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.