概述
一个超级简单的日历，日历核心代码只有十几行，方便以后扩展成日程管理。源码点击这里
前言
日历或者日程管理，在项目中是个高频使用的组件，经常会碰到日程管理这种需求，网上已经有很多成熟的库，但是产品经理的思维是你我无法揣测的，所以先储备一下，做个简单的日历，方便以后用的的时候直接用，代码使用react写的，但是核心的日历计算思想可以用到各种框架中。
实现
首先看看最终实现的效果
可以看到一个能查看上一个月或者下一个月的简单日历。
日历的计算的核心就是通过date.setdate()方法，可以获取到相对于当前日期的某天，比如new Date().setdate(1)就是当前日期的下一天
代码很简单也有注释，就不多赘述，有不懂的地方留言，秒回
import React, {Component} from 'react';
import style from './style.use.less'
export default class Test extends Component {
constructor(props) {
super(props);
this.state = {
currentDay: '',
currentMonth: '',
currentYear: '',
weekList: [
{name: '一', className: ''},
{name: '二', className: ''},
{name: '三', className: ''},
{name: '四', className: ''},
{name: '五', className: ''},
{name: '六', className: ''},
{name: '日', className: ''}
],
dayList: []
}
this.initCalendar = this.initCalendar.bind(this);
this.renderHeader = this.renderHeader.bind(this);
this.renderBody = this.renderBody.bind(this);
this.preMonth = this.preMonth.bind(this);
this.nextMonth = this.nextMonth.bind(this);
}
componentWillMount() {
// style.use() // 需要配置loader 可以直接注释 忽略掉 实现每个模块卸载之后 css也会销毁 可以看之前写的一篇react css局部作用域的文章
}
componentWillUnmount() {
// style.unuse() // 需要配置loader 可以直接注释 忽略掉 实现每个模块卸载之后 css也会销毁 可以看之前写的一篇react css局部作用域的文章
}
componentDidMount() {
this.initCalendar()
}
// 获取当前date的当月第一天的字符串形式
getMonthFirstDate(date) {
let nowYear = date.getFullYear(); // 获取年份
let nowMonth = date.getMonth()+1; // 获取月份
return `${nowYear}-${nowMonth}-01`
}
// 获取当前date的字符串形式
getDateString(date) {
let nowYear = date.getFullYear(); // 获取年份
let nowMonth = date.getMonth()+1; // 获取月份
let day = date.getDate();
day = day < 10 ? '0' + day : day;
return `${nowYear}-${nowMonth}-${day}`
}
// 上个月
preMonth() {
let date = new Date(`${this.state.currentYear}-${this.state.currentMonth}-${this.state.currentDay}`)
let preMonthFirstDate = new Date(this.getMonthFirstDate(new Date(date.setDate(0)))); // 0 是上个月最后一天
this.initCalendar(preMonthFirstDate)
}
// 下个月
nextMonth() {
let date = new Date(`${this.state.currentYear}-${this.state.currentMonth}-${this.state.currentDay}`)
let nextMonthFirstDate = new Date(this.getMonthFirstDate(new Date(date.setDate(33))));
this.initCalendar(nextMonthFirstDate)
}
// 初始化日历
initCalendar(currentDate) {
let nowDate = currentDate ? currentDate : new Date();
let nowMonthFirstDate = this.getMonthFirstDate(nowDate) // 获取当月1号日期
let nowWeek = new Date(nowMonthFirstDate).getDay() ? new Date(nowMonthFirstDate).getDay() : 7; // 获取星期
let newDateList = []; // 创建日期数组
let startDay = 2 - nowWeek; // 开始日期的下标 以为 setDate(0)是上个月最后一天 所以是2-nowWeek
let showDayLength = nowWeek < 6 ? 35 : 42; // 如果5行能显示下一个月 就只显示5行
// 循环处理 获取日历上应该显示的日期
for (let i = startDay; i < startDay + showDayLength; i++) {
let date = new Date(new Date(nowMonthFirstDate).setDate(i)); // 获取时间对象
let day = date.getDate() < 10 ? '0' + date.getDate() : date.getDate() // 小于9的数字前面加0
let dayObject = {
date: this.getDateString(date),
day,
className: '',
}
// new Date(str).toDateString() === new Date().toDateString()
if (date.toDateString() === new Date().toDateString()) {
dayObject.className = 'today'
}
newDateList.push(dayObject)
}
this.setState((pre) => {
return {
dayList: newDateList,
currentDay: nowDate.getDate(),
currentMonth: nowDate.getMonth() + 1 >= 10 ? nowDate.getMonth() + 1 : '0' + (nowDate.getMonth() + 1),
currentYear: nowDate.getFullYear(),
}
})
}
renderHeader() {
return(
<div className = 'calendar-header'>
<div className = 'calendar-header-left'>
<button onClick = {this.preMonth}>上个月</button>
</div>
<div className = ''>
{this.state.currentYear}年{this.state.currentMonth}月
</div>
<div className = 'calendar-header-right'>
<button onClick = {this.nextMonth}>下个月</button>
</div>
</div>
)
}
renderBody() {
return(
<div className = 'calendar-body'>
<div className = 'week-container'>
{this.state.weekList.map(week => {
return <div key = {week.name} className = {`week ${week.className}`}>{week.name}</div>
})}
</div>
<div className = 'day-container'>
{this.state.dayList.map( (dayObject, index) => {
return <div key = {index} className = {`day ${dayObject.className}`}>{dayObject.day}</div>
})}
</div>
</div>
)
}
render() {
return(
<div className = 'calendar'>
{this.renderHeader()}
{this.renderBody()}
</div>
)
}
}
css文件
.calendar {
width: 320px;
margin-top: 40px;
.calendar-header {
display: flex;
justify-content: space-between;
padding: 14px 12px;
}
.calendar-body {
.week-container {
display: flex;
flex-wrap: wrap;
justify-content: space-around;
margin-bottom: 10px;
.week {
&:nth-child(6), &:nth-child(7){
color: #e02d2d;
}
width: 14.2%;
display: inline-block;
text-align: center;
}
}
.day-container {
height: 140px;
display: flex;
flex-wrap: wrap;
justify-content: space-around;
.day {
width: 14.2%;
display: inline-block;
text-align: center;
&:nth-child(7n-1){
color: #e02d2d;
}
&:nth-child(7n){
color: #e02d2d;
}
&.today {
color: green;
}
}
}
}
}
