我是一个新的反应和玩弄注册表格。我的渲染方法始终显示当前状态user.name，user.email，error属性始终标记为正确。
但是，在我的绑定方法中（considerSubmit，validateEmail等）。console.log(this.state)输出我的默认状态，而不是当前状态。
我在这里缺少什么？我认为.bind(this)会在所有方法中同步状态。
import React, {Component} from 'react';
import PropTypes from 'prop-types';
import {withStyles, createStyleSheet} from 'material-ui/styles';
import TextField from 'material-ui/TextField';
import Button from 'material-ui/Button';
import Dialog, {
DialogActions,
DialogContent,
DialogContentText,
DialogTitle,
} from 'material-ui/Dialog';
import Slide from 'material-ui/transitions/Slide';
const popsicle = require('popsicle');
const styleSheet = createStyleSheet('RegistrationProgress', {
root: {
maxWidth: 400,
flexGrow: 1,
},
});
class RegistrationProgress extends React.Component {
constructor(props) {
super(props);
this.state = {
user: {
name: null,
isNameValid: null,
email: null,
isEmailValid: null
},
notice: {
title: null,
message: null,
open: false,
}
};
}
handleRequestClose() {
let noticeState = this.state.notice;
noticeState.open = false;
this.setState({notice: noticeState});
};
considerSubmit(event) {
const isSubmitAction = event.key === 'Enter' || event.type === 'click';
if (isSubmitAction) {
let userState = this.state.user;
let formReady = (userState.isNameValid && userState.isEmailValid);
if (!formReady) {
this.showNotice("Hold on a sec!", "Make sure your first and last name is provided as well as a proper email address.");
return;
}
var RegistrationProgress = this;
var element = document.querySelector('meta[name="csrf-token"]');
var csrf_token = element && element.getAttribute("content");
console.log(userState, userState.name,this.state.user)
popsicle.request({
method: 'POST',
url: '/register',
body: {
name: userState.name,
email: userState.email,
_token: csrf_token
},
headers: {
'X-XSRF-TOKEN': csrf_token
}
})
.use(popsicle.plugins.parse('json'))
.then(function (res) {
console.log(res.status) // => 200
console.log(res.body) //=> { ... }
console.log(res.get('Content-Type')) //=> 'application/json'
RegistrationProgress.showNotice("Yeehaw!", "Account created! Confirm your email to login.");
})
.catch(function(error){
RegistrationProgress.showNotice("Uh-oh.", "Looks like our server hiccuped when handling your request. Try again.")
});
}
return event;
}
showNotice(title = "Whoa!", message) {
this.setState({
notice: {
title: title,
message: message,
open: true
}
})
}
validateName(event) {
const nameRule = /^(([A-Za-z]+[\-\']?)*([A-Za-z]+)?\s)+([A-Za-z]+[\-\']?)*([A-Za-z]+)?$/;
let registerName = (event.target.value).trim();
let userState = this.state.user;
userState.isNameValid = nameRule.test(registerName);
console.log(userState)
this.setState({user: userState})
}
validateEmail(event) {
const emailRule = /^([a-zA-Z0-9_\-\.]+)@([a-zA-Z0-9_\-\.]+)\.([a-zA-Z]{2,5})$/;
let registerEmail = (event.target.value).trim();
let userState = this.state.user;
userState.isEmailValid = emailRule.test(registerEmail);
this.setState({
user: userState
})
}
render() {
const classes = this.props.classes;
return (
<div className="register-form" onKeyPress={this.considerSubmit.bind(this)}>
<TextField id="name" name="name" label="Full Name" type="text" defaultValue={this.state.user.name}
className={classes.input}
error={RegistrationProgress.getErrorState(this.state.user.isNameValid)}
helperText="" onChange={(event) => this.validateName(event)} marginForm
/>
<br/>
<TextField id="email" name="email" label="Email" type="email" defaultValue={this.state.user.email}
className={classes.input}
error={RegistrationProgress.getErrorState(this.state.user.isEmailValid)}
helperText="" onChange={(event) => this.validateEmail(event)} marginForm
/>
<br />
<Button raised color="primary" className={'register-button ' + classes.button}
onClick={(event) => this.considerSubmit(event)}>
Sign Up
</Button>
<Dialog open={this.state.notice.open} transition={Slide}
onRequestClose={this.handleRequestClose.bind(this)}>
<DialogTitle>
{this.state.notice.title}
</DialogTitle>
<DialogContent>
<DialogContentText>
{this.state.notice.message}
</DialogContentText>
</DialogContent>
<DialogActions>
<Button onClick={this.handleRequestClose.bind(this)} color="primary">
Got it!
</Button>
</DialogActions>
</Dialog>
</div>
);
}
static getErrorState(value) {
return (!value && value !== null);
}
}
RegistrationProgress.propTypes = {
classes: PropTypes.object.isRequired,
};
export default withStyles(styleSheet)(RegistrationProgress);
答案 0 :(得分：0)
您的组件处理程序只是绑定＆＃39;这个＆＃39;处理程序方法但不调用它们。
你可以绑定这个＆＃39;在你的构造函数中，或使你的处理程序功能为＆＃39;胖箭头＆＃39;函数（然后自动绑定）。然后，请务必在组件中正确设置处理程序：
构造
constructor(props) {
super(props);
this.state = {
user: {
name: null,
isNameValid: null,
email: null,
isEmailValid: null
},
notice: {
title: null,
message: null,
open: false,
}
};
this.considerSubmit.bind(this);
this.handleRequestClose.bind(this);
this.handleRequestClose.bind(this);
}
渲染：
render() {
const classes = this.props.classes;
return (
<div className="register-form" onKeyPress={this.considerSubmit()}>
<TextField id="name" name="name" label="Full Name" type="text" defaultValue={this.state.user.name}
className={classes.input}
error={RegistrationProgress.getErrorState(this.state.user.isNameValid)}
helperText="" onChange={(event) => this.validateName(event)} marginForm
/>
<br/>
<TextField id="email" name="email" label="Email" type="email" defaultValue={this.state.user.email}
className={classes.input}
error={RegistrationProgress.getErrorState(this.state.user.isEmailValid)}
helperText="" onChange={(event) => this.validateEmail(event)} marginForm
/>
<br />
<Button raised color="primary" className={'register-button ' + classes.button}
onClick={(event) => this.considerSubmit(event)}>
Sign Up
</Button>
<Dialog open={this.state.notice.open} transition={Slide}
onRequestClose={this.handleRequestClose()}>
<DialogTitle>
{this.state.notice.title}
</DialogTitle>
<DialogContent>
<DialogContentText>
{this.state.notice.message}
</DialogContentText>
</DialogContent>
<DialogActions>
<Button onClick={this.handleRequestClose())} color="primary">
Got it!
</Button>
</DialogActions>
</Dialog>
</div>
);
}