我正在創建一個多步驟的反應形式。父組件有 3 個子組件，它們是表單的步驟。在第一步中，我有 4 個文本輸入，需要一個復選框來允許 wpp 通信，問題是我無法將復選框的狀態設定true為單擊時。父組件是這樣的：
import React from 'react';
import FormStep0 from './formStepZero';
import FormStep1 from './formStepOne';
class VendeForm extends React.Component {
constructor(props) {
super(props)
this.state = {
currentStep: 0,
nombre: '',
apellido: '',
celular: '',
email: '',
username: '',
password: '',
checkbox: false,
}
}
handleChange = event => {
const {name, value} = event.target
this.setState({
[name]: value
})
}
handleSubmit = event => {
event.preventDefault()
const { email, username, password, nombre, apellido, celular,checkbox } = this.state
alert(`Your registration detail: \n
Email: ${email} \n
Username: ${username} \n
Password: ${password} \n
Nombre: ${nombre} \n
Apellido: ${apellido} \n
Celular: ${celular} \n
Checkbox: ${checkbox} \n`)
}
_next = () => {
let currentStep = this.state.currentStep
currentStep = currentStep >= 2? 3: currentStep 1
this.setState({
currentStep: currentStep
})
}
_prev = () => {
let currentStep = this.state.currentStep
currentStep = currentStep <= 0? 0: currentStep - 1
this.setState({
currentStep: currentStep
})
}
/*
* the functions for our button
*/
previousButton() {
let currentStep = this.state.currentStep;
if(currentStep > 1){
return (
<div className='vertical-center'>
<button
className="btn btn-secondary float-right mx-2 my-2"
type="button" onClick={this._prev}>
Previous
</button>
</div>
)
}
return null;
}
nextButton(){
let currentStep = this.state.currentStep;
if(currentStep <3 && currentStep >=1){
return (
<div className='vertical-center'>
<button
className="btn primary-bg-style float-left mx-2 my-2"
type="button" onClick={this._next}>
Siguiente
</button>
</div>
)
}
return null;
}
empecemosButton(){
let currentStep = this.state.currentStep;
if(currentStep === 0){
return (
<div className='vertical-center'>
<button
className="btn primary-bg-style"
type="button" onClick={this._next}>
Vamos!
</button>
</div>
)
}
return null;
}
render() {
return (
<React.Fragment>
{/*render the form steps and pass required props in*/}
<Step0
currentStep={this.state.currentStep}
handleChange={this.handleChange}
/>
<div className="container d-flex flex-column py-2">
<form onSubmit={this.handleSubmit}>
<Step1
currentStep={this.state.currentStep}
handleChange={this.handleChange}
nombre={this.state.nombre}
apellido={this.state.apellido}
celular={this.state.celular}
email={this.state.email}
checkbox={this.state.checkbox}
/>
<Step2
currentStep={this.state.currentStep}
handleChange={this.handleChange}
username={this.state.username}
/>
<Step3
currentStep={this.state.currentStep}
handleChange={this.handleChange}
password={this.state.password}
/>
</form>
<div className='prev-next-btn'>
{this.previousButton()}
{this.nextButton()}
</div>
{this.empecemosButton()}
</div>
</React.Fragment>
);
}
}
function Step0(props){
if (props.currentStep !== 0) {
return null
}
return(
<div className="vertical-center"> {/*<!--^--- Added class --> */}
...
</div>
)
}
function Step1(props) {
if (props.currentStep !== 1) {
return null
}
return(
<div className="form-group">
<div className="vertical-center">
<div className="container">
<h1 className='pb-4 px-2'>Datos de Contacto</h1>
<CircleSteps currentStep={props.currentStep} />
<FormStep1 nombre={props.nombre}
apellido={props.apellido}
celular={props.celular}
email={props.email}
checkbox={props.checkbox}
handleChange = {props.handleChange}
/>
</div>
</div>
</div>
);
}
export default VendeForm;
復選框所在的子組件是：
import React from 'react';
import {Col, Row,Container} from 'reactstrap'
function FormStep1(props) {
return(
<div>
<Container className="vende-form-container pt-3">
<Row className='align-items-center justify-content-center'>
<Col md={4} sm={12}>
<div className="form-group">
<label htmlFor="nombre">Nombre</label>
<input
className="form-control"
id="nombre"
name="nombre"
type="text"
placeholder="Escribe tu nombre"
value={props.nombre}
onChange={props.handleChange}
/>
</div>
</Col>
<Col md={4} sm={12} >
<div className="form-group">
<label htmlFor="apellido">Apellido</label>
<input
className="form-control"
id="apellido"
name="apellido"
type="text"
placeholder="Escribe tu apellido"
value={props.apellido}
onChange={props.handleChange}
/>
</div>
</Col>
</Row>
<Row className='align-items-center justify-content-center'>
<Col md={4} sm={12}>
<div className="form-group">
<label htmlFor="celular">Celular</label>
<input
className="form-control"
id="celular"
name="celular"
type="text"
placeholder="Escribe tu celular"
value={props.celular}
onChange={props.handleChange}
/>
</div>
</Col>
<Col md={4} sm={12}>
<div className="form-group">
<label htmlFor="email">Email</label>
<input
className="form-control"
id="email"
name="email"
type="text"
placeholder="Escribe tu email"
value={props.email}
onChange={props.handleChange}
/>
</div>
</Col>
</Row>
<Row className='align-items-center justify-content-start'>
{/* checkbox allowing whatsapp communication */}
<Col sm={{size:6, offset:2}} md={{size:3, offset:2}}>
<div className="form-check">
<input
className="form-check-input"
id="wppCheckbox"
name="controlled"
type="checkbox"
checked={props.checkbox}
onChange={props.handleChange}
/>
<label className="form-check-label" htmlFor="wppCheckbox">
Aceptas comunicacion via Whatsapp
</label>
</div>
</Col>
</Row>
</Container>
</div>
);
}
export default FormStep1;
目前我的行為是我單擊復選框但保持空白，表單的其他欄位也運行良好并正確傳遞給狀態
uj5u.com熱心網友回復：
如果我理解正確，您的復選框由通用 handleChange() 函式處理：
handleChange = event => {
const {name, value} = event.target
this.setState({
[name]: value
})
}
您可以嘗試進行除錯的最簡單的事情就是在單擊復選框時記錄您在該函式中獲得的內容。很可能在這種情況下，您總是得到相同的值（“on”），因此狀態沒有任何變化。我建議要么使用專用的處理程式，要么修改這個像
handleChange = event => {
const {name, type, value} = event.target
if (type === 'checkbox') {
return this.setState({
[name]: event.target.checked
})
}
this.setState({
[name]: value
})
}
轉載請註明出處，本文鏈接：https://www.uj5u.com/qiye/497742.html
標籤：javascript 反应 形式
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