微信小程序、mpvue小程序 picker-view日期选择器的使用

- 日理万妓 2021-09-17 04:36 480阅读 0赞

因为小程序自带的picker日期选择器样式等不能够自定义，所以我使用了picker-view，可以自定义样式。本示例是使用mpvue开发的微信小程序，适用于 微信小程序（自己稍微改下样式和逻辑）、mpvue、vue开发的项目。也因为 picker-view 原来的示例中每个月返回的都是31天，不够准确。这个示例作出了修改，同时对闰年 2月份有多少天也做了操作。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NDMwMDAw_size_16_color_FFFFFF_t_70][]

具体代码如下：

<template>
      <div class="freeRoom">
        <div class="selectTime" @click="selectTime">选择时间</div>
        <div>
            <div class="timeText">{
       {year}}年{
       {month}}月{
       {day}}日</div>
            <picker-view class="pickerView" :value="value" @change="bindDateChangeStart">
                <picker-view-column class="pickerColumn">
                    <div class="pickerItem" v-for="(item,key) in years" :key='key'>{
       {item}}年</div>
                </picker-view-column>
                <picker-view-column class="pickerColumn">
                    <div class="pickerItem" v-for="(item,key) in months" :key='key'>{
       {item}}月</div>
                </picker-view-column>
                <picker-view-column class="pickerColumn">
                    <div class="pickerItem" v-for="(item,key) in days" :key='key'>{
       {item}}日</div>
                </picker-view-column>
            </picker-view>
        </div>
      </div>
    </template>
    
    <script>
    export default {
        data () {
            return {
                years: [],
                months: [],
                days: [],
                year: 0,
                month: 0,
                day: 0,
                value: [8, 1, 1]
            }
        },
        onLoad () {
            this.initDatas()
        },
        methods: {
            initDatas () {
                // 获取当前年月
                const date = new Date()
                const nowYear = date.getFullYear()
                const nowMonth = date.getMonth() + 1
                const nowDay = date.getDate()
                this.year = nowYear
                this.month = nowMonth
                this.day = nowDay
                // 循环前先清空数组
                this.years = []
                this.months = []
                // 2010年到2028年
                for (let i = 2010; i <= nowYear + 10; i++) {
                    this.years.push(i)
                }
                // 设置月份列表
                for (let i = 1; i <= 12; i++) {
                    this.months.push(i)
                }
                // 初始化当前年月
                this.getMonth(nowYear, nowMonth, nowDay)
            },
            getMonth (year, month, day) {
                let daysInMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
                let dayNum = 0
                // 通过年和月获取这个月份下有多少天
                if (month === 2) { // 闰年
                    dayNum = ((year % 4 === 0) && ((year % 100) !== 0)) || (year % 400 === 0) ? 29 : 28
                } else {
                    dayNum = daysInMonth[month - 1]
                }
                this.days = []
                for (let i = 1; i <= dayNum; i++) {
                    this.days.push(i)
                }
                // 初始 选中年月日对应下标
                let yearIdx = 0
                let monthIdx = 0
                let dayIdx = 0
    
                // 获取滚动后 年月日对应的下标
                this.years.map((v, idx) => {
                    if (v === year) {
                        yearIdx = idx
                    }
                })
                this.months.map((v, idx) => {
                    if (v === month) {
                        monthIdx = idx
                    }
                })
                this.days.map((v, idx) => {
                    if (v === day) {
                        dayIdx = idx
                    }
                })
                // 重置滚动后 年月日 的下标
                this.value = [yearIdx, monthIdx, dayIdx]
                // 赋值年月日
                this.year = this.years[yearIdx]
                this.month = this.months[monthIdx]
                this.day = this.days[dayIdx]
            },
            bindDateChangeStart (e) {
                // valIndex 是获取到的年月日在各自集合中的下标
                const valIndex = e.mp.detail.value
                // console.log(JSON.stringify(e.mp.detail.value))
                let year = this.years[valIndex[0]]
                let month = this.months[valIndex[1]]
                let day = this.days[valIndex[2]]
                // 滚动时再动态 通过年和月获取 这个月下对应有多少天
                this.getMonth(year, month, day)
            }
        }
    }
    </script>
    
    <style lang="less" scoped>
        .freeRoom{
            .timeText{
                text-align: center;
            }
            .pickerView{
                width:100%;
                height: 300rpx;
                margin-top: 100rpx;
                .pickerColumn{
                    .pickerItem{
                        line-height:68rpx;
                        height:34rpx;
                        overflow:hidden;
                        text-align: center;
                    }
                }
            }
        }
    </style>

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NDMwMDAw_size_16_color_FFFFFF_t_70]: /images/20210813/5e1f7e3e75ac4787ac5f1e6adca5de33.png