我正在尝试向我的 Formik 表单添加一个 react-bootstrap 警报，以便 handleSubmit 向用户发出表单已提交的警报。
我使用了 react-bootstrap 记录的 Alert 形式，但是我不得不更改最后一行，因为这似乎不起作用(错误说如果我使用 react-bootstrap 记录的形式，我没有导出任何东西警报。
我的警报是:
import React from 'react';
import {
Alert,
Button,
} from "react-bootstrap";
class AlertDismissible extends React.Component {
constructor(props) {
super(props);
this.state = { show: true };
}
render() {
const handleHide = () => this.setState({ show: false });
const handleShow = () => this.setState({ show: true });
return (
<>
<Alert show={this.state.show} variant="light">
<Alert.Heading>Thanks for your interest </Alert.Heading>
<p>
We'll be in touch with login details shortly.
</p>
<hr />
<div className="d-flex justify-content-end">
<Button onClick={handleHide} variant="outline-success">
Close
</Button>
</div>
</Alert>
{!this.state.show && <Button onClick={handleShow}>Show Alert</Button>}
</>
);
}
}
export default AlertDismissible;
文档将最后一行显示为:
render(<AlertDismissible />);
如果我尝试使用它，则会出现一条错误消息，指出未定义渲染，并且没有导出任何内容。所以 - 我用我的最后一行替换了那一行。
然后，在我的表格中我有:
handleSubmit = (formState, { resetForm }) => {
// Now, you're getting form state here!
const payload = {
...formState,
role: formState.role.value,
createdAt: firebase.firestore.FieldValue.serverTimestamp()
}
console.log("formvalues", payload);
fsDB
.collection("register")
.add(payload)
.then(docRef => {
resetForm(initialValues);
})
.then => {<AlertDismissible />}
.catch(error => {
console.error("Error adding document: ", error);
});
}
我实际上并不知道如何让警报起作用(上面的 then 语句是一个猜测——我找不到任何例子。这个猜测给出了一个错误:
Parsing error: Unexpected token, expected ";"
我试过添加“;”在每个我能想到的地方放一个，但它总是产生错误。
如果我这样尝试:
.then(<AlertDismissible />)
我没有收到任何错误并且表单已提交，但未显示警报。
有谁知道如何在 handle submit 函数中调用 react-bootstrap 警报？
提交按钮有:
<Button
variant="outline-primary"
type="submit"
style={style3}
id="submitRegistration"
onClick={handleSubmit}
disabled={!dirty || isSubmitting}>
Register
</Button>
onSubmit 有:
onSubmit={
this.handleSubmit
}
我的整个表单如下所示:
import React from 'react';
import { Link } from "react-router-dom";
import { Formik, Form, Field, ErrorMessage, withFormik } from "formik";
import * as Yup from "yup";
import Select from "react-select";
import { fsDB, firebase, settings } from "../../firebase";
import Temporarynav from '../navigation/Temporarynav.jsx';
import Demo from '../landing/Demo.jsx';
import Footer from '../footer/Footer.jsx';
import "./preregister/Form.css";
import AlertDismissible from '../auth/preregister/Alert';
import {
Badge,
Button,
Col,
ComponentClass,
Feedback,
FormControl,
FormGroup,
Table,
Row,
Container
} from "react-bootstrap";
import Alert from 'react-bootstrap/Alert';
const style1 = {
width: "60%",
margin: "auto"
};
const style2 = {
paddingTop: "2em"
};
const style3 = {
marginRight: "2em"
};
const initialValues = {
firstName: "",
lastName: "",
email: "",
role: "",
consent: false,
createdAt: ''
}
class PreregForm extends React.Component {
// constructor(props) {
// super(props);
// // the flag isFormDone will control where you will show the Alert component
// this.state = {
// isFormDone: false
// };
// }
handleSubmit = (formState, { resetForm }) => {
// Now, you're getting form state here!
const payload = {
...formState,
role: formState.role.value,
createdAt: firebase.firestore.FieldValue.serverTimestamp()
}
console.log("formvalues", payload);
fsDB
.collection("preregistrations")
.add(payload)
.then(docRef => {
resetForm(initialValues);
})
.then(() => {
// Here is where you flag your form completion and allow the alert to be shown.
// this.setState((prevState) => {...prevState, isFormDone: true});
.catch(error => {
console.error("Error adding document: ", error);
});
}
render() {
const options = [
{ value: "academic", label: "Academic Researcher" },
{ value: "student", label: "Student (inc PhD)" },
]
// const {isFormDone} = this.state;
return(
<Formik
initialValues={initialValues}
validationSchema={Yup.object().shape({
firstName: Yup.string().required("First Name is required"),
lastName: Yup.string().required("Last Name is required"),
email: Yup.string()
.email("Email is invalid")
.required("Email is required"),
role: Yup.string().nullable().required(
"It will help us get started if we know a little about your background"
),
consent: Yup.boolean().oneOf(
[true],
"You must accept the Terms of Use and Privacy Policy"
)
})}
onSubmit={
this.handleSubmit
}
render={({
errors,
status,
touched,
setFieldValue,
setFieldTouched,
handleSubmit,
isSubmitting,
dirty,
values
}) => {
return (
<div>
<Temporarynav />
<Form style={style1}>
<h1 style={style2}>Get Started</h1>
<p>
We're almost ready to open this up to the research community. By
registering now, you'll be first in line when the doors open.
</p>
<div className="form-group">
<label htmlFor="firstName">First Name</label>
<Field
name="firstName"
type="text"
className={
"form-control" +
(errors.firstName && touched.firstName ? " is-invalid" : "")
}
/>
<ErrorMessage
name="firstName"
component="div"
className="invalid-feedback"
/>
</div>
<div className="form-group">
<label htmlFor="lastName">Last Name</label>
<Field
name="lastName"
type="text"
className={
"form-control" +
(errors.lastName && touched.lastName ? " is-invalid" : "")
}
/>
<ErrorMessage
name="lastName"
component="div"
className="invalid-feedback"
/>
</div>
<div className="form-group">
<label htmlFor="email">Email</label>
<Field
name="email"
type="text"
placeholder="Please use your work email address"
className={
"form-control" +
(errors.email && touched.email ? " is-invalid" : "")
}
/>
<ErrorMessage
name="email"
component="div"
className="invalid-feedback"
/>
</div>
<div className="form-group">
<label htmlFor="role">
Which role best describes yours?
</label>
<Select
key={`my_unique_select_keyrole`}
name="role"
className={
"react-select-container" +
(errors.role && touched.role ? " is-invalid" : "")
}
classNamePrefix="react-select"
value={values.role}
onChange={selectedOptions => {
// Setting field value - name of the field and values chosen.
setFieldValue("role", selectedOptions)}
}
onBlur={setFieldTouched}
options={options}
/>
{errors.role && touched.role &&
<ErrorMessage
name="role"
component="div"
className="invalid-feedback d-block"
/>}
</div>
<div className="form-group">
<div className="checkbox-wrapper">
<Field
name="consent"
type="checkbox"
checked={values.consent}
className={
"checkbox" +
(errors.consent && touched.consent ? " is-invalid" : "")
}
/>
<label htmlFor="consent" className="checkbox_label_wrapper">
You must accept the{" "}
<Link className="links" to={"/Terms"}>
Terms of Use
</Link>{" "}
and{" "}
<Link className="links" to={"/Privacy"}>
Privacy Policy
</Link>
</label>
</div>
{errors.consent && touched.consent &&
<ErrorMessage
name="consent"
component="div"
className="invalid-feedback d-block"
/>
}
</div>
<div className="form-group">
<Button
variant="outline-primary"
type="submit"
style={style3}
id="submitRegistration"
onClick={handleSubmit}
disabled={!dirty || isSubmitting}
>
Register
</Button>
</div>
</Form>
<Demo />
<Footer />
</div>
);
}
}
/>
)
}
}
export default PreregForm;
下一次尝试
当我尝试 Julius 解决方案时，警报出现，但作为表单下方的页脚 - 而不是弹出警报。
最佳答案
使用状态和条件渲染。不是将组件设置状态返回给变量，而是在您的渲染中使用条件渲染来检查值是否为真。
handleSubmit = (formState, { resetForm }) => {
// Now, you're getting form state here!
const payload = {
...formState,
role: formState.role.value,
createdAt: firebase.firestore.FieldValue.serverTimestamp()
};
console.log('formvalues', payload);
fsDB
.collection('register')
.add(payload)
.then(docRef => {
resetForm(initialValues);
})
.then(e => this.setState({ alert: true }))
.catch(error => {
console.error('Error adding document: ', error);
});
};
在你的渲染中
render() {
...
return(
....
{this.state.alert && <AlertDismissible />}
...
)
}
填写表格
import React from 'react';
import { Link } from 'react-router-dom';
import { Formik, Form, Field, ErrorMessage, withFormik } from 'formik';
import * as Yup from 'yup';
import Select from 'react-select';
import { fsDB, firebase, settings } from '../../firebase';
import Temporarynav from '../navigation/Temporarynav.jsx';
import Demo from '../landing/Demo.jsx';
import Footer from '../footer/Footer.jsx';
import './preregister/Form.css';
import AlertDismissible from '../auth/preregister/Alert';
import {
Badge,
Button,
Col,
ComponentClass,
Feedback,
FormControl,
FormGroup,
Table,
Row,
Container
} from 'react-bootstrap';
import Alert from 'react-bootstrap/Alert';
const style1 = {
width: '60%',
margin: 'auto'
};
const style2 = {
paddingTop: '2em'
};
const style3 = {
marginRight: '2em'
};
const initialValues = {
firstName: '',
lastName: '',
email: '',
role: '',
consent: false,
createdAt: ''
};
class PreregForm extends React.Component {
constructor(props) {
super(props);
// the flag isFormDone will control where you will show the Alert component
this.state = {
showAlert: false
};
}
handleSubmit = (formState, { resetForm }) => {
// Now, you're getting form state here!
const payload = {
...formState,
role: formState.role.value,
createdAt: firebase.firestore.FieldValue.serverTimestamp()
};
console.log('formvalues', payload);
fsDB
.collection('preregistrations')
.add(payload)
.then(docRef => {
resetForm(initialValues);
})
.then(e => this.setState({ showAlert: true }))
.catch(error => {
console.error('Error adding document: ', error);
});
};
render() {
const options = [
{ value: 'academic', label: 'Academic Researcher' },
{ value: 'student', label: 'Student (inc PhD)' }
];
// const {isFormDone} = this.state;
return (
<div>
{!this.state.showAlert ? (
<div>
<Formik
initialValues={initialValues}
validationSchema={Yup.object().shape({
firstName: Yup.string().required('First Name is required'),
lastName: Yup.string().required('Last Name is required'),
email: Yup.string()
.email('Email is invalid')
.required('Email is required'),
role: Yup.string()
.nullable()
.required(
'It will help us get started if we know a little about your background'
),
consent: Yup.boolean().oneOf(
[true],
'You must accept the Terms of Use and Privacy Policy'
)
})}
onSubmit={this.handleSubmit}
render={({
errors,
status,
touched,
setFieldValue,
setFieldTouched,
handleSubmit,
isSubmitting,
dirty,
values
}) => {
return (
<div>
<Temporarynav />
<Form style={style1}>
<h1 style={style2}>Get Started</h1>
<p>
We're almost ready to open this up to the research
community. By registering now, you'll be first in line
when the doors open.
</p>
<div className="form-group">
<label htmlFor="firstName">First Name</label>
<Field
name="firstName"
type="text"
className={
'form-control' +
(errors.firstName && touched.firstName
? ' is-invalid'
: '')
}
/>
<ErrorMessage
name="firstName"
component="div"
className="invalid-feedback"
/>
</div>
<div className="form-group">
<label htmlFor="lastName">Last Name</label>
<Field
name="lastName"
type="text"
className={
'form-control' +
(errors.lastName && touched.lastName
? ' is-invalid'
: '')
}
/>
<ErrorMessage
name="lastName"
component="div"
className="invalid-feedback"
/>
</div>
<div className="form-group">
<label htmlFor="email">Email</label>
<Field
name="email"
type="text"
placeholder="Please use your work email address"
className={
'form-control' +
(errors.email && touched.email ? ' is-invalid' : '')
}
/>
<ErrorMessage
name="email"
component="div"
className="invalid-feedback"
/>
</div>
<div className="form-group">
<label htmlFor="role">
Which role best describes yours?
</label>
<Select
key={`my_unique_select_keyrole`}
name="role"
className={
'react-select-container' +
(errors.role && touched.role ? ' is-invalid' : '')
}
classNamePrefix="react-select"
value={values.role}
onChange={selectedOptions => {
// Setting field value - name of the field and values chosen.
setFieldValue('role', selectedOptions);
}}
onBlur={setFieldTouched}
options={options}
/>
{errors.role && touched.role && (
<ErrorMessage
name="role"
component="div"
className="invalid-feedback d-block"
/>
)}
</div>
<div className="form-group">
<div className="checkbox-wrapper">
<Field
name="consent"
type="checkbox"
checked={values.consent}
className={
'checkbox' +
(errors.consent && touched.consent
? ' is-invalid'
: '')
}
/>
<label
htmlFor="consent"
className="checkbox_label_wrapper"
>
You must accept the{' '}
<Link className="links" to={'/Terms'}>
Terms of Use
</Link>{' '}
and{' '}
<Link className="links" to={'/Privacy'}>
Privacy Policy
</Link>
</label>
</div>
{errors.consent && touched.consent && (
<ErrorMessage
name="consent"
component="div"
className="invalid-feedback d-block"
/>
)}
</div>
<div className="form-group">
<Button
variant="outline-primary"
type="submit"
style={style3}
id="submitRegistration"
onClick={handleSubmit}
disabled={!dirty || isSubmitting}
>
Register
</Button>
</div>
</Form>
<Demo />
<Footer />
</div>
);
}}
/>
</div>
) : (
<AlertDismissible />
)}
</div>
);
}
}
export default PreregForm;
关于javascript - 在 Formik 中添加 react-bootstrap 警报以处理提交，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56230323/
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