Javascript 需要帮助使事件处理程序在react js中正常工作吗
我需要在每次更改输入字段值时执行此逻辑:Javascript 需要帮助使事件处理程序在react js中正常工作吗,javascript,reactjs,Javascript,Reactjs,我需要在每次更改输入字段值时执行此逻辑: let warningMessage = '' if (stateData) { let list = [] if (props.values.injured_worker_type === 'Seasonal') { list = stateData.calculation_warnings['Seasonal'] } else { list = stateData.calculation_wa
let warningMessage = ''
if (stateData) {
let list = []
if (props.values.injured_worker_type === 'Seasonal') {
list = stateData.calculation_warnings['Seasonal']
} else {
list = stateData.calculation_warnings[`FullTime-${props.values.working_days}`]
}
const keys = _.keys(list)
const index = _.findIndex(keys, key => {
const fromValue = Number(key.slice(1, key.indexOf('-')))
const toValue = Number(key.slice(key.indexOf('-') + 1, key.length))
return props.values.total_days_paid >= fromValue && props.values.total_days_paid < toValue
})
if (index >= 0) {
warningMessage = list[keys[index]]
}
}
const message = warningMessage ? (
<p style={{ color: 'red', fontSize: '0.85rem' }}> {warningMessage} </p>
) : null
let warningMessage=''
if(状态数据){
让列表=[]
如果(props.values.infected_worker_type===‘季节性’){
列表=stateData.calculation\u警告['Seasonal']
}否则{
list=stateData.calculation\u警告[`FullTime-${props.values.working\u days}`]
}
const keys=u.keys(列表)
常量索引=uu.findIndex(键,键=>{
const fromValue=Number(key.slice(1,key.indexOf('-'))
常量toValue=Number(key.slice(key.indexOf('-')+1,key.length))
返回props.values.total_days_paid>=fromValue&&props.values.total_days_paid=0){
警告消息=列表[键[索引]]
}
}
const message=警告消息?(
{warningMessage}
):null
并向下传递此消息,作为此逻辑的结果输出:
const message = warningMessage ? (
<p style={{ color: 'red', fontSize: '0.85rem' }}> {warningMessage} </p>
) : null
return (
<Fragment>
<Form.Group grouped style={{ marginTop: '2rem' }}>
<label style={{ fontSize: '0.85rem' }}>8. Total days in preceeding 52 weeks:</label>
<Form.Input
name="total_days_paid"
onChange={this.handleChange}
width="6"
placeholder="200"
required
/>
</Form.Group>
{/* THIS messeage is result of that logic which I need to
be executed every time on changed input */}
{message}
</Fragment>
const message=warningMessage?(
{warningMessage}
):null
当我有输入字段时,这里是JSX(html)部分:
const message = warningMessage ? (
<p style={{ color: 'red', fontSize: '0.85rem' }}> {warningMessage} </p>
) : null
return (
<Fragment>
<Form.Group grouped style={{ marginTop: '2rem' }}>
<label style={{ fontSize: '0.85rem' }}>8. Total days in preceeding 52 weeks:</label>
<Form.Input
name="total_days_paid"
onChange={this.handleChange}
width="6"
placeholder="200"
required
/>
</Form.Group>
{/* THIS messeage is result of that logic which I need to
be executed every time on changed input */}
{message}
</Fragment>
返回(
8.前52周的总天数:
{/*这个混乱是我需要解释的逻辑的结果
每次更改输入时都要执行*/}
{message}
)
}
下面是stackblitz中代码的不工作版本:
如何使其工作?您的示例中的代码没有多大帮助,因为它有错误,即使在我安装缺少的依赖项时,它也不会输出任何内容,但仅从阅读中我可以看到一个问题 当
输入
值更改时要执行的逻辑需要进入您试图在此处调用的handleChange
方法onChange={this.handleChange}
作为参考,将调用这些类型的
输入
字段,您可以在中了解更多有关这些字段的信息。示例中的代码没有多大帮助,因为它有错误,即使我安装缺少的依赖项,它也不会输出任何内容,但仅从阅读中我可以看到问题
当输入
值更改时要执行的逻辑需要进入您试图在此处调用的handleChange
方法onChange={this.handleChange}
作为参考,将调用这些类型的
输入
字段,您可以在中阅读有关这些字段的更多信息。您的代码不符合标准。您在代码中犯了很多错误
我已经更正了所有代码,下面是处理函数的工作解决方案
index.js
import React from 'react'
import ReactDom from "react-dom";
import Hello from './Hello';
ReactDom.render(<Hello />, document.getElementById("root"));
import React, { Component, Fragment } from 'react'
import { Form } from 'semantic-ui-react'
import _ from 'lodash'
export default class Hello extends Component{
constructor(props){
super(props);
}
handleChange = e => {
console.log(e.target.value)
}
render(){
const { stateData } = this.props;
let warningMessage = ''
if (stateData) {
let list = []
if (props.values.injured_worker_type === 'Seasonal') {
list = stateData.calculation_warnings['Seasonal']
} else {
list = stateData.calculation_warnings[`FullTime-${props.values.working_days}`]
}
const keys = _.keys(list)
const index = _.findIndex(keys, key => {
const fromValue = Number(key.slice(1, key.indexOf('-')))
const toValue = Number(key.slice(key.indexOf('-') + 1, key.length))
return props.values.total_days_paid >= fromValue && props.values.total_days_paid < toValue
})
if (index >= 0) {
warningMessage = list[keys[index]]
}
}
const message = warningMessage ? (
<p style={{ color: 'red', fontSize: '0.85rem' }}> {warningMessage} </p>
) : null
return (
<Fragment>
<Form.Group grouped style={{ marginTop: '2rem' }}>
<label style={{ fontSize: '0.85rem' }}>8. Total days in preceeding 52 weeks:</label>
<Form.Input
name="total_days_paid"
onChange={this.handleChange}
width="6"
placeholder="200"
required
/>
</Form.Group>
{message}
</Fragment>
)
}
}
从“React”导入React
从“react dom”导入react dom;
从“./Hello”导入Hello;
render(,document.getElementById(“根”));
Hello.js
import React from 'react'
import ReactDom from "react-dom";
import Hello from './Hello';
ReactDom.render(<Hello />, document.getElementById("root"));
import React, { Component, Fragment } from 'react'
import { Form } from 'semantic-ui-react'
import _ from 'lodash'
export default class Hello extends Component{
constructor(props){
super(props);
}
handleChange = e => {
console.log(e.target.value)
}
render(){
const { stateData } = this.props;
let warningMessage = ''
if (stateData) {
let list = []
if (props.values.injured_worker_type === 'Seasonal') {
list = stateData.calculation_warnings['Seasonal']
} else {
list = stateData.calculation_warnings[`FullTime-${props.values.working_days}`]
}
const keys = _.keys(list)
const index = _.findIndex(keys, key => {
const fromValue = Number(key.slice(1, key.indexOf('-')))
const toValue = Number(key.slice(key.indexOf('-') + 1, key.length))
return props.values.total_days_paid >= fromValue && props.values.total_days_paid < toValue
})
if (index >= 0) {
warningMessage = list[keys[index]]
}
}
const message = warningMessage ? (
<p style={{ color: 'red', fontSize: '0.85rem' }}> {warningMessage} </p>
) : null
return (
<Fragment>
<Form.Group grouped style={{ marginTop: '2rem' }}>
<label style={{ fontSize: '0.85rem' }}>8. Total days in preceeding 52 weeks:</label>
<Form.Input
name="total_days_paid"
onChange={this.handleChange}
width="6"
placeholder="200"
required
/>
</Form.Group>
{message}
</Fragment>
)
}
}
import React,{Component,Fragment}来自“React”
从“语义ui反应”导入{Form}
从“lodash”导入
导出默认类Hello扩展组件{
建造师(道具){
超级(道具);
}
handleChange=e=>{
console.log(例如target.value)
}
render(){
const{stateData}=this.props;
让warningMessage=“”
if(状态数据){
让列表=[]
如果(props.values.infected_worker_type===‘季节性’){
列表=stateData.calculation\u警告['Seasonal']
}否则{
list=stateData.calculation\u警告[`FullTime-${props.values.working\u days}`]
}
const keys=u.keys(列表)
常量索引=uu.findIndex(键,键=>{
const fromValue=Number(key.slice(1,key.indexOf('-'))
常量toValue=Number(key.slice(key.indexOf('-')+1,key.length))
返回props.values.total_days_paid>=fromValue&&props.values.total_days_paid=0){
警告消息=列表[键[索引]]
}
}
const message=警告消息(
{warningMessage}
):null
返回(
8.前52周的总天数:
{message}
)
}
}
index.html
<html>
<body>
<div id="root"></div>
</body>
</html>
您的代码没有达到标准。您在代码中犯了很多错误 我已经更正了所有代码,下面是处理函数的工作解决方案 index.js
import React from 'react'
import ReactDom from "react-dom";
import Hello from './Hello';
ReactDom.render(<Hello />, document.getElementById("root"));
import React, { Component, Fragment } from 'react'
import { Form } from 'semantic-ui-react'
import _ from 'lodash'
export default class Hello extends Component{
constructor(props){
super(props);
}
handleChange = e => {
console.log(e.target.value)
}
render(){
const { stateData } = this.props;
let warningMessage = ''
if (stateData) {
let list = []
if (props.values.injured_worker_type === 'Seasonal') {
list = stateData.calculation_warnings['Seasonal']
} else {
list = stateData.calculation_warnings[`FullTime-${props.values.working_days}`]
}
const keys = _.keys(list)
const index = _.findIndex(keys, key => {
const fromValue = Number(key.slice(1, key.indexOf('-')))
const toValue = Number(key.slice(key.indexOf('-') + 1, key.length))
return props.values.total_days_paid >= fromValue && props.values.total_days_paid < toValue
})
if (index >= 0) {
warningMessage = list[keys[index]]
}
}
const message = warningMessage ? (
<p style={{ color: 'red', fontSize: '0.85rem' }}> {warningMessage} </p>
) : null
return (
<Fragment>
<Form.Group grouped style={{ marginTop: '2rem' }}>
<label style={{ fontSize: '0.85rem' }}>8. Total days in preceeding 52 weeks:</label>
<Form.Input
name="total_days_paid"
onChange={this.handleChange}
width="6"
placeholder="200"
required
/>
</Form.Group>
{message}
</Fragment>
)
}
}
从“React”导入React
从“react dom”导入react dom;
从“./Hello”导入Hello;
render(,document.getElementById(“根”));
Hello.js
import React from 'react'
import ReactDom from "react-dom";
import Hello from './Hello';
ReactDom.render(<Hello />, document.getElementById("root"));
import React, { Component, Fragment } from 'react'
import { Form } from 'semantic-ui-react'
import _ from 'lodash'
export default class Hello extends Component{
constructor(props){
super(props);
}
handleChange = e => {
console.log(e.target.value)
}
render(){
const { stateData } = this.props;
let warningMessage = ''
if (stateData) {
let list = []
if (props.values.injured_worker_type === 'Seasonal') {
list = stateData.calculation_warnings['Seasonal']
} else {
list = stateData.calculation_warnings[`FullTime-${props.values.working_days}`]
}
const keys = _.keys(list)
const index = _.findIndex(keys, key => {
const fromValue = Number(key.slice(1, key.indexOf('-')))
const toValue = Number(key.slice(key.indexOf('-') + 1, key.length))
return props.values.total_days_paid >= fromValue && props.values.total_days_paid < toValue
})
if (index >= 0) {
warningMessage = list[keys[index]]
}
}
const message = warningMessage ? (
<p style={{ color: 'red', fontSize: '0.85rem' }}> {warningMessage} </p>
) : null
return (
<Fragment>
<Form.Group grouped style={{ marginTop: '2rem' }}>
<label style={{ fontSize: '0.85rem' }}>8. Total days in preceeding 52 weeks:</label>
<Form.Input
name="total_days_paid"
onChange={this.handleChange}
width="6"
placeholder="200"
required
/>
</Form.Group>
{message}
</Fragment>
)
}
}
import React,{Component,Fragment}来自“React”
从“语义ui反应”导入{Form}
从“lodash”导入
导出默认类Hello扩展组件{
建造师(道具){
超级(道具);
}
handleChange=e=>{
console.log(例如target.value)
}
render(){
const{stateData}=this.props;
让warningMessage=“”
if(状态数据){
让列表=[]
如果(props.values.infected_worker_type===‘季节性’){
列表=stateData.calculation\u警告['Seasonal']
}否则{
list=stateData.calculation\u警告[`FullTime-${props.values.working\u days}`]
}
const keys=u.keys(列表)
常量索引=uu.findIndex(键,键=>{
const fromValue=Number(key.slice(1,key.indexOf('-'))
常量toValue=Number(key.slice(key.indexOf('-')+1,key.length))
返回props.values.total_days_paid>=fromValue&&props.values.total_days_paid=0){
警告消息=列表[键[索引]]
}
}
const message=警告消息(
{warningMessage}
):null
返回(
8.前52周的总天数:
{message}
)
}
}
index.html
<html>
<body>
<div id="root"></div>
</body>
</html>