React:如何使用 React Hooks 在 Function 组件中添加 onChange 功能?需要来自复选框的 onClick 事件来影响输入状态
React: How to add onChange functionality inside of Function component using React Hooks? Need onClick event from a checkbox to influence input state
我有一个带有复选框和输入的功能组件。我正在尝试为复选框创建一个 onChange 函数,该函数通过实现 useState
React Hook 清除输入并在用户单击它时将其禁用。有没有人对以前做过类似事情的 Hooks 有任何经验?我正在尝试查看代码示例以更好地解决这个问题,因为我还是 React Hooks 的新手
import React from 'react'
import PropTypes from 'prop-types'
import styled from 'styled-components'
import {
Col, Row, Icon, Input, Tooltip
} from 'antd'
import Checkbox from '../elements/Checkbox'
const CustomerDetails = ({ customer }) => {
if (customer === null) {
return (
<Container>
<Row>
<Col span={24}>
<ErrorContainer>
<Icon type="exclamation-circle" />
</ErrorContainer>
</Col>
</Row>
</Container>
)
}
return (
<Container>
<h2>{customer.contact.name}</h2>
<Row>
<Col span={8}>
<H3>
<strong>Primary Contact:</strong>
</H3>
<P>{customer.contact.name}</P>
<P>{customer.contact.phone}</P>
</Col>
<Col span={8}>
<H3>
<strong>Service Address:</strong>
</H3>
<P>{customer.site.address1}</P>
<P>{customer.site.address2}</P>
<P>
{customer.site.city}, {customer.site.state}
{customer.site.postalCode}
</P>
</Col>
<Col span={8}>
<H3>
<strong>Billing Address:</strong>
</H3>
<P>{customer.account.billingStreet}</P>
<P>
{customer.account.billingCity}, {customer.account.billingState}
{customer.account.billingPostalCode}
</P>
</Col>
</Row>
<br />
<Row>
<Col span={10}>
<h4>
PRIMARY CONTACT EMAIL
<Tooltip
placement="topRight"
title={primaryContact}
>
<StyledTooltipIcon
type="question-circle"
theme="filled"
/>
</Tooltip>
</h4>
</Col>
</Row>
<Row>
<Col span={8}>
<StyledInput value={customer.contact.email} />
</Col>
<Col span={2} />
<Col span={8}>
<StyledCheckbox /> EMAIL OPT OUT{' '}
<Tooltip
placement="topRight"
title={emailText}
>
<StyledTooltipIcon
type="question-circle"
theme="filled"
/>
</Tooltip>
</Col>
</Row>
</Container>
)
}
CustomerDetails.propTypes = {
customer: PropTypes.object
}
CustomerDetails.defaultProps = {
customer: {}
}
const Container = styled.div`
text-align: left;
`
const StyledCheckbox = styled(Checkbox)`
input + span {
border-radius: 0px;
width: 35px;
height: 35px;
border: 2px solid ${({ theme }) => theme.colors.black};
background-color: transparent;
color: ${({ theme }) => theme.colors.black};
border-color: ${({ theme }) => theme.colors.black};
transition: none;
}
input:checked + span {
border: 2px solid ${({ theme }) => theme.colors.black};
width: 30px;
height: 30px;
}
input + span:after {
border-color: ${({ theme }) => theme.colors.black};
left: 20%;
transition: none;
width: 12.5px;
height: 20px;
}
input:disabled + span:after {
border-color: ${({ theme }) => theme.colors.gray};
}
input:not(:checked):hover + span:after {
border-color: ${({ theme }) => theme.colors.gray};
opacity: 1;
transform: rotate(45deg) scale(1) translate(-50%, -50%);
}
input:focus + span {
border-color: ${({ theme }) => theme.colors.primary};
}
`
const StyledInput = styled(Input)`
max-width: 100%;
&&& {
border: 2px solid ${({ theme }) => theme.colors.black};
border-radius: 0px;
height: 35px;
}
`
const ErrorContainer = styled.div`
/* margin-left: 25%; */
`
const StyledTooltipIcon = styled(Icon)`
color: #1571da;
`
const H3 = styled.h3`
white-space: nowrap;
margin-top: 0;
margin-bottom: 0;
line-height: 1.5;
}
`
const H4 = styled.h4`
text-decoration: underline;
color: #1590ff;
`
const P = styled.p`
margin-top: 0;
margin-bottom: 0;
font-size: 1rem;
`
export default CustomerDetails
您可以使用 useState
挂钩创建一个状态变量来跟踪用户是否单击了复选框以禁用其他输入。 useState
hook 是一个函数,它接受一个初始值和 returns 一个状态变量和一个用于更新该状态变量值的函数(它的工作原理与 setState
几乎相同,但只是对于单个状态变量)。
例如:
const [x, setX] = React.useState(1); // `x` is initially 1, but that will change on later renders
setX(prevX => prevX + 1); // increments `x` for the next render;
您还需要创建一个事件处理函数来响应此复选框的点击。
这是一个完整的例子:
import React from "react";
const MyComponent = props => {
const [disableInputIsChecked, setDisableInputIsChecked] = React.useState(false);
const [inputValue, setInputValue] = React.useState("");
function clearInput() {
setInputValue("");
}
function handleInputChange(event) {
setInputValue(event.target.value);
}
function handleCheckboxClick(event) {
if (!disableInputIsChecked) { // this click was to check the box
clearInput();
}
setDisableInputIsChecked(prevValue => !prevValue); // invert value
}
return (
<form>
<input type="checkbox" value={ disableInputIsChecked } onChange={ handleCheckboxClick }/>
<input type="text" value={ inputValue } onChange={ handleInputChange } disabled={ disableInputIsChecked }/>
</form>
)
}
这是一个working example。
您可能想为这些值想出更好的名称,但希望您能理解这里的要点。
我有一个带有复选框和输入的功能组件。我正在尝试为复选框创建一个 onChange 函数,该函数通过实现 useState
React Hook 清除输入并在用户单击它时将其禁用。有没有人对以前做过类似事情的 Hooks 有任何经验?我正在尝试查看代码示例以更好地解决这个问题,因为我还是 React Hooks 的新手
import React from 'react'
import PropTypes from 'prop-types'
import styled from 'styled-components'
import {
Col, Row, Icon, Input, Tooltip
} from 'antd'
import Checkbox from '../elements/Checkbox'
const CustomerDetails = ({ customer }) => {
if (customer === null) {
return (
<Container>
<Row>
<Col span={24}>
<ErrorContainer>
<Icon type="exclamation-circle" />
</ErrorContainer>
</Col>
</Row>
</Container>
)
}
return (
<Container>
<h2>{customer.contact.name}</h2>
<Row>
<Col span={8}>
<H3>
<strong>Primary Contact:</strong>
</H3>
<P>{customer.contact.name}</P>
<P>{customer.contact.phone}</P>
</Col>
<Col span={8}>
<H3>
<strong>Service Address:</strong>
</H3>
<P>{customer.site.address1}</P>
<P>{customer.site.address2}</P>
<P>
{customer.site.city}, {customer.site.state}
{customer.site.postalCode}
</P>
</Col>
<Col span={8}>
<H3>
<strong>Billing Address:</strong>
</H3>
<P>{customer.account.billingStreet}</P>
<P>
{customer.account.billingCity}, {customer.account.billingState}
{customer.account.billingPostalCode}
</P>
</Col>
</Row>
<br />
<Row>
<Col span={10}>
<h4>
PRIMARY CONTACT EMAIL
<Tooltip
placement="topRight"
title={primaryContact}
>
<StyledTooltipIcon
type="question-circle"
theme="filled"
/>
</Tooltip>
</h4>
</Col>
</Row>
<Row>
<Col span={8}>
<StyledInput value={customer.contact.email} />
</Col>
<Col span={2} />
<Col span={8}>
<StyledCheckbox /> EMAIL OPT OUT{' '}
<Tooltip
placement="topRight"
title={emailText}
>
<StyledTooltipIcon
type="question-circle"
theme="filled"
/>
</Tooltip>
</Col>
</Row>
</Container>
)
}
CustomerDetails.propTypes = {
customer: PropTypes.object
}
CustomerDetails.defaultProps = {
customer: {}
}
const Container = styled.div`
text-align: left;
`
const StyledCheckbox = styled(Checkbox)`
input + span {
border-radius: 0px;
width: 35px;
height: 35px;
border: 2px solid ${({ theme }) => theme.colors.black};
background-color: transparent;
color: ${({ theme }) => theme.colors.black};
border-color: ${({ theme }) => theme.colors.black};
transition: none;
}
input:checked + span {
border: 2px solid ${({ theme }) => theme.colors.black};
width: 30px;
height: 30px;
}
input + span:after {
border-color: ${({ theme }) => theme.colors.black};
left: 20%;
transition: none;
width: 12.5px;
height: 20px;
}
input:disabled + span:after {
border-color: ${({ theme }) => theme.colors.gray};
}
input:not(:checked):hover + span:after {
border-color: ${({ theme }) => theme.colors.gray};
opacity: 1;
transform: rotate(45deg) scale(1) translate(-50%, -50%);
}
input:focus + span {
border-color: ${({ theme }) => theme.colors.primary};
}
`
const StyledInput = styled(Input)`
max-width: 100%;
&&& {
border: 2px solid ${({ theme }) => theme.colors.black};
border-radius: 0px;
height: 35px;
}
`
const ErrorContainer = styled.div`
/* margin-left: 25%; */
`
const StyledTooltipIcon = styled(Icon)`
color: #1571da;
`
const H3 = styled.h3`
white-space: nowrap;
margin-top: 0;
margin-bottom: 0;
line-height: 1.5;
}
`
const H4 = styled.h4`
text-decoration: underline;
color: #1590ff;
`
const P = styled.p`
margin-top: 0;
margin-bottom: 0;
font-size: 1rem;
`
export default CustomerDetails
您可以使用 useState
挂钩创建一个状态变量来跟踪用户是否单击了复选框以禁用其他输入。 useState
hook 是一个函数,它接受一个初始值和 returns 一个状态变量和一个用于更新该状态变量值的函数(它的工作原理与 setState
几乎相同,但只是对于单个状态变量)。
例如:
const [x, setX] = React.useState(1); // `x` is initially 1, but that will change on later renders
setX(prevX => prevX + 1); // increments `x` for the next render;
您还需要创建一个事件处理函数来响应此复选框的点击。
这是一个完整的例子:
import React from "react";
const MyComponent = props => {
const [disableInputIsChecked, setDisableInputIsChecked] = React.useState(false);
const [inputValue, setInputValue] = React.useState("");
function clearInput() {
setInputValue("");
}
function handleInputChange(event) {
setInputValue(event.target.value);
}
function handleCheckboxClick(event) {
if (!disableInputIsChecked) { // this click was to check the box
clearInput();
}
setDisableInputIsChecked(prevValue => !prevValue); // invert value
}
return (
<form>
<input type="checkbox" value={ disableInputIsChecked } onChange={ handleCheckboxClick }/>
<input type="text" value={ inputValue } onChange={ handleInputChange } disabled={ disableInputIsChecked }/>
</form>
)
}
这是一个working example。
您可能想为这些值想出更好的名称,但希望您能理解这里的要点。