本文介绍了在Reaction组件之间传递数据的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在试着做简单的日历。在我的日历中，我有日、日、月和月名组件，以及我在主日历上访问它的所有内容。初始加载时，它将显示当前月历。
现在，当我从月份名称组件中选择"月"时，希望传递给"月"组件，然后传递到"天"组件以呈现日期。
我尝试使用回调函数，但它对我没有帮助
整个反应组件都在这里https://stackblitz.com/edit/react-ts-z2278r
Day component
import * as moment from 'moment'
import * as React from 'react'
import { showComponent } from '../../../../models'
import { MonthNames } from './'
import styles from './Calendar.module.scss'
interface IDatePickerMonthsProps {
changeMonthComponent: (showComponent: showComponent, monthNo: number) => void
}
interface IDatePickerMonthsState {
dateObject: moment.Moment,
monthNo?: number
}
export class DatePickerMonths extends React.Component<IDatePickerMonthsProps, IDatePickerMonthsState> {
constructor(props: IDatePickerMonthsProps) {
super(props)
this.state = {
dateObject: moment()
}
}
public render() {
const monthPicker =
<div className="datepicker-days">
<table className={styles.table}>
<thead>
<tr>
<th><span className="ms-Icon ms-Icon--ChevronLeft" title="Previous Month" onClick={this.onPrev}></span></th>
<th className={styles["picker-switch"]} data-action="pickerSwitch" colSpan={5} title="Select Month">
{this.year()}
</th>
<th><span className="ms-Icon ms-Icon--ChevronRight" title="Next Month" onClick={this.onNext}></span></th>
</tr>
</thead>
<tbody>
<tr>
<td colSpan={7}>
<MonthNames changeMonthComponent={() => this.showDays(this.state.monthNo)} />
</td>
</tr>
</tbody>
</table>
</div>
return (monthPicker)
}
private year = () => {
return this.state.dateObject.format("Y");
};
private onPrev = () => {
this.setState({
dateObject: this.state.dateObject.subtract(1, "year")
});
};
private onNext = () => {
this.setState({
dateObject: this.state.dateObject.add(1, "year")
});
};
private showDays = (monthNo: number) => {
console.log(monthNo)
this.setState({ monthNo: monthNo })
this.props.changeMonthComponent(showComponent.Days, monthNo)
}
}
Month name component
import * as moment from 'moment'
import * as React from 'react'
import { showComponent } from '../../../../models'
interface IMonthNamesProps {
changeMonthComponent: (showComponent: showComponent, monthNo: number) => void
}
export class MonthNames extends React.Component<IMonthNamesProps, {}> {
private monthshort: string[] = moment.monthsShort();
constructor(props: IMonthNamesProps) {
super(props)
}
public render() {
let monthshortname = this.monthshort.map((month, monthNo) => {
return <span key={monthNo} onClick={() => this.showDays(monthNo)}>{month}</span>;
});
return monthshortname
}
private showDays = (monthNo: number) => {
this.props.changeMonthComponent(showComponent.Days, monthNo)
}
}
Month component
import * as moment from 'moment'
import * as React from 'react'
import { showComponent } from '../../../../models'
import { MonthNames } from './'
import styles from './Calendar.module.scss'
interface IDatePickerMonthsProps {
changeMonthComponent: (showComponent: showComponent, monthNo: number) => void
}
interface IDatePickerMonthsState {
dateObject: moment.Moment,
monthNo?: number
}
export class DatePickerMonths extends React.Component<IDatePickerMonthsProps, IDatePickerMonthsState> {
constructor(props: IDatePickerMonthsProps) {
super(props)
this.state = {
dateObject: moment()
}
}
public render() {
const monthPicker =
<div className="datepicker-days">
<table className={styles.table}>
<thead>
<tr>
<th><span className="ms-Icon ms-Icon--ChevronLeft" title="Previous Month" onClick={this.onPrev}></span></th>
<th className={styles["picker-switch"]} data-action="pickerSwitch" colSpan={5} title="Select Month">
{this.year()}
</th>
<th><span className="ms-Icon ms-Icon--ChevronRight" title="Next Month" onClick={this.onNext}></span></th>
</tr>
</thead>
<tbody>
<tr>
<td colSpan={7}>
<MonthNames changeMonthComponent={() => this.showDays(this.state.monthNo)} />
</td>
</tr>
</tbody>
</table>
</div>
return (monthPicker)
}
private year = () => {
return this.state.dateObject.format("Y");
};
private onPrev = () => {
this.setState({
dateObject: this.state.dateObject.subtract(1, "year")
});
};
private onNext = () => {
this.setState({
dateObject: this.state.dateObject.add(1, "year")
});
};
private showDays = (monthNo: number) => {
console.log(monthNo)
this.setState({ monthNo: monthNo })
this.props.changeMonthComponent(showComponent.Days, monthNo)
}
}
推荐答案
我已经解决了我的问题，在**See Sharper**的帮助下，感谢支持和加票。
现在回到我的问题上。我的日历最初加载正确，但当我在MonthName组件(即，子组件)中更改月份和年份时，向上传递到DayPickerMonths(即父组件)，然后向上传递到Calendar组件(即，祖父组件)，然后向下传递到DatePickerDays组件(即，子组件与Calendar同级，与DayPickerMonths同级)
在视觉上看起来是这样的因此从子(即MonthName)开始
函数
private showDays = (monthNo: number) => {
this.props.changeMonthComponent(monthNo)
}
调用渲染
public render() {
let monthshortname = this.monthshort.map((month, monthNo) => {
return <span key={monthNo} onClick={() => this.showDays(monthNo)}>{month}</span>;
});
return monthshortname
}
DayPickerMonths(即父级)
<MonthNames changeMonthComponent={(monthNo) => this.showDays(monthNo, this.state.dateObject.year())} />
private showDays = (monthNo: number, year: number) => {
this.props.changeMonthComponent(showComponent.Days, monthNo, year)
}
日历(即祖父母)
<DatePickerMonths
changeMonthComponent={(childData, monthNo, year) => this.changeMonthComponent(childData, monthNo, year)} />
private changeMonthComponent = (childData: showComponent, monthNo: number, year: number) => {
this.setState({ showComponent: childData, monthNo: monthNo, year: year })
}
DayPickerDays(即日历的子项和DayPicker的兄弟项)
private showMonths = () => {
this.props.changeComponent(showComponent.Months)
}
public componentDidMount() {
this.setState({ dateObject: this.state.dateObject.month(this.props.monthNo).year(this.props.year) })
}
我已在此更新了我的https://stackblitz.com/edit/react-ts-z2278r
但是，当在DayPickerDays组件中更改年份时，它没有反映在DayPickerMonths中，且传递数据很麻烦，我们应该使用反应上下文使其变得全局和简单。我会尽快更新这个答案，一旦我成为提供者，因为我需要为我的眼睛检查去预约医生
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