开发微信小程序过程中，有个需求需要用到日期时间筛选器，查看微信官方文档后，发现官方文档的picker筛选器只能单独支持日期或者是时间，所以为了实现需求自己参考企业微信封装了个日期时间筛选器组件。
原理
筛选器的实现，我参考的是小程序官方方式，通过半屏弹窗（mp-half-screen-dialog）结合picker_view进行日期、时间的选择，最终在选择时间后，通过事件触发返回一个change事件，其中参数值为毫秒级时间戳。
实现
1.弹窗的显隐：
在组件的 properties 中传入一个 show 字段，用于控制弹窗的显隐；默认值为 false。
2.筛选器类型：
为了更好的兼容性，提供一个 type 字段，用于控制筛选器的所支持 可选择日期 的走向（往前、往后、前后都支持）；默认值为 center（前后都支持）。
3.时间区间（年）：
year 字段用于控制筛选器的年维度时间区间范围；默认值为 1。
4.时间区间（月）：
month 字段用于控制筛选器的月维度时间区间范围。默认值为 ‘undefined’****（声明’month’ 不为undefined时 year失效）。
具体思路：整体思路是监听弹窗的显隐（show），当弹窗显示时，获取对应配置项（类型、年、月）计算对应筛选器的范围，并初始化默认日期时间为当前年月日时分。
以下是效果图以及具体代码实现：
wxml代码
<mp-half-screen-dialog show="{{ show }}" maskClosable="{{ true }}" closabled="{{ false }}" extClass="f-date-dialog" catchtouchmove="preventTouchMove" bindclose="bindclose">
<view slot="desc" class="flex column full-width full-height">
<view class="bd flex full-width">
<!-- 日期 -->
<view class="flex1 flex column align-items-center">
<picker-view indicator-style="height: 50px;" mode="selector" value="{{ [dateIndex] }}" class="selector__picker" bindchange="dateChange">
<picker-view-column>
<view wx:for="{{ dateArr }}" wx:key="index" style="line-height: 50px" class="text-center {{ item.name.length < 10 ? 'h4' : 'h6' }}">{{ item.name }}</view>
</picker-view-column>
</picker-view>
</view>
<!-- 小时 -->
<view class="flex1 flex column align-items-center">
<picker-view indicator-style="height: 50px;" mode="selector" value="{{ [hourValue] }}" class="selector__picker" bindchange="hourChange">
<picker-view-column>
<view wx:for="{{ hourArr }}" wx:key="index" style="line-height: 50px" class="text-center">{{ item }}</view>
</picker-view-column>
</picker-view>
</view>
<!-- 分钟 -->
<view class="flex1 flex column align-items-center">
<picker-view indicator-style="height: 50px;" mode="selector" value="{{ [minValue] }}" class="selector__picker" bindchange="minChange">
<picker-view-column>
<view wx:for="{{ minArr }}" wx:key="index" style="line-height: 50px" class="text-center">{{ item }}</view>
</picker-view-column>
</picker-view>
</view>
</view>
<view class="ft flex align-items-center justify-content-space-between">
<button type="default" style="width:45%;height: 40px;" class="weui-btn" bindtap="bindclose">取消</button>
<button type="primary" style="width:45%;height: 40px;margin-top:0" class="weui-btn" bindtap="handleSubmit">确定</button>
</view>
</view>
</mp-half-screen-dialog>js代码
const utils = require('../../utils/util')
Component({
options: {
addGlobalClass: true
},
properties: {
show: {
type: Boolean,
value: false,
observer: '_showChange'
},
type: {
type: String,
value: 'center' // 类型：'left' -- 现在往前 'center' -- 往前&往后 'right' -- 现在往后
},
year: {
type: Number,
value: 1 // '时间区间{year}年' month不为undefined时该项失效
},
month: {
type: [Number, String],
value: 'undefined' // 'month' 不为undefined时 year失效
}
},
data: {
dateIndex: null,
hourValue: '',
minValue: '',
dateArr: [],
hourArr: [],
minArr: [],
activeTime: null // 抛出的时间戳
},
methods: {
_showChange(e) {
if (e) {
this.handleDateData()
this.initData()
}
},
handleSubmit() {
this.bindclose()
this.triggerEvent('change', { value: this.data.activeTime })
},
initData() {
const now = +new Date()
const index = this.data.dateArr.map(v => v.name).indexOf(utils.formatTime(now, '{m}月{d}日周{a}'))
let tmp = this.data.dateArr
tmp[index].name = '今天'
this.setData({
dateIndex: index,
hourValue: utils.formatTime(now, '{h}'),
minValue: utils.formatTime(now, '{i}'),
dateArr: tmp,
activeTime: now
})
},
handleDateData() {
const nowYear = new Date().getFullYear()
let mins = []
let hours = []
let dates = []
// 获取小时、分钟数组
for (let i = 0; i < 60; i++) {
mins.push(i.toString().length < 2 ? '0' + i : i.toString())
}
for (let j = 0; j < 24; j++) {
hours.push(j.toString().length < 2 ? '0' + j : j.toString())
}
dates = this.getDays(nowYear)
this.setData({
hourArr: hours,
minArr: mins,
dateArr: dates
})
},
getDays(year) {
let pre_days = []
let now_days = []
let aft_days = []
if (this.data.month == 'undefined') {
// 判断类型
if (this.data.type == 'left') {
for (let a = this.data.year; a >= 1; a--) {
pre_days.push(...this.getDaysByYear(year - a, true))
}
} else if (this.data.type == 'right') {
for (let b = 1; b <= this.data.year; b++) {
aft_days.push(...this.getDaysByYear(year + b, true))
}
} else {
for (let a = this.data.year; a >= 1; a--) {
pre_days.push(...this.getDaysByYear(year - a, true))
}
for (let b = 1; b <= this.data.year; b++) {
aft_days.push(...this.getDaysByYear(year + b, true))
}
}
now_days = this.getDaysByYear(year)
} else {
now_days = this.getDaysByMonth(year, this.data.type)
}
return pre_days.concat(now_days.concat(aft_days))
},
getDaysByYear(year, isIncludeYear) {
let days = []
for (let k = 1; k < 13; k++) {
let each_days = new Date(year, k, 0).getDate()
for (let _k = 1; _k <= each_days; _k++) {
let time = +new Date(`${year}-${k}-${_k}`)
if (isIncludeYear) {
days.push({ name: utils.formatTime(time, '{y}年{m}月{d}日周{a}'), value: time })
} else {
days.push({ name: utils.formatTime(time, '{m}月{d}日周{a}'), value: time })
}
}
}
return days
},
getDaysByMonth(year, type) {
let days = []
let nowMonth = new Date().getMonth() + 1
// 当月份传负的或0时当成本月
if (this.data.month > 0) {
let months = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
let pre_mons = []
let aft_mons = []
// 生成往前、往后的月份数组
for (let k = 1; k <= this.data.month; k++) {
let tmp_pre = months.indexOf(nowMonth) - k
let tmp_aft = months.indexOf(nowMonth) + k
pre_mons.unshift(months[tmp_pre < 0 ? 12 + tmp_pre : tmp_pre])
aft_mons.push(months[tmp_aft > 12 ? tmp_aft - 12 : tmp_aft])
}
if (type != 'right') {
// 往前的月份的日期
pre_mons.forEach(v => {
// 跨年
let month_days = 0
if (v > nowMonth) {
month_days = new Date(year - 1, v, 0).getDate()
for (let k = 1; k <= month_days; k++) {
let time = +new Date(`${year - 1}-${v}-${k}`)
days.push({ name: utils.formatTime(time, '{y}年{m}月{d}日周{a}'), value: time })
}
} else {
month_days = new Date(year, v, 0).getDate()
for (let k = 1; k <= month_days; k++) {
let time = +new Date(`${year}-${v}-${k}`)
days.push({ name: utils.formatTime(time, '{m}月{d}日周{a}'), value: time })
}
}
})
}
// 本月的日期
let month_days = new Date(year, nowMonth, 0).getDate()
for (let k = 1; k <= month_days; k++) {
let time = +new Date(`${year}-${nowMonth}-${k}`)
days.push({ name: utils.formatTime(time, '{m}月{d}日周{a}'), value: time })
}
if (type != 'left') {
// 往后的月份的日期
aft_mons.forEach(_v => {
// 跨年
let month_days = 0
if (_v < nowMonth) {
month_days = new Date(year + 1, _v, 0).getDate()
for (let k = 1; k <= month_days; k++) {
let time = +new Date(`${year + 1}-${_v}-${k}`)
days.push({ name: utils.formatTime(time, '{y}年{m}月{d}日周{a}'), value: time })
}
} else {
month_days = new Date(year, _v, 0).getDate()
for (let k = 1; k <= month_days; k++) {
let time = +new Date(`${year}-${_v}-${k}`)
days.push({ name: utils.formatTime(time, '{m}月{d}日周{a}'), value: time })
}
}
})
}
} else {
let month_days = new Date(year, nowMonth, 0).getDate()
for (let k = 1; k <= month_days; k++) {
let time = +new Date(`${year}-${nowMonth}-${k}`)
days.push({ name: utils.formatTime(time, '{m}月{d}日周{a}'), value: time })
}
}
return days
},
dateChange(e) {
const day = this.data.dateArr[e.detail.value[0]]
let time = day.value + (Number(this.data.hourValue) * 3600 + Number(this.data.minValue) * 60) * 1000
this.setData({
dateIndex: e.detail.value[0],
activeTime: time
})
},
hourChange(e) {
const hour = Number(this.data.hourArr[e.detail.value[0]])
let time = this.data.dateArr[this.data.dateIndex].value + (hour * 3600 + Number(this.data.minValue) * 60) * 1000
this.setData({
hourValue: this.data.hourArr[e.detail.value[0]],
activeTime: time
})
},
minChange(e) {
const min = Number(this.data.minArr[e.detail.value[0]])
let time = this.data.dateArr[this.data.dateIndex].value + (Number(this.data.hourValue) * 3600 + min * 60) * 1000
this.setData({
minValue: this.data.minArr[e.detail.value[0]],
activeTime: time
})
},
bindclose() {
this.setData({
show: false
})
},
preventTouchMove() {
// 阻止半屏状态下 页面滑动
}
}
})wxss代码
.selector__picker {
width: 100%;
height: 80%;
margin-top: 20px;
font-size: 24px;
}上述代码中，js中引用的 utils 功能函数如下：
export function formatTime(time, cFormat) {
if (arguments.length === 0) {
return ''
}
const format = cFormat || '{y}-{m}-{d}'
let date
if (time === undefined || time === 0 || time === '') {
return ''
} else if (typeof time === 'object') {
date = time
} else {
if (('' + time).length === 10) time = parseInt(time) * 1000
date = new Date(time)
}
const formatObj = {
y: date.getFullYear(),
m: date.getMonth() + 1,
d: date.getDate(),
h: date.getHours(),
i: date.getMinutes(),
s: date.getSeconds(),
a: date.getDay()
}
const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
let value = formatObj[key]
// Note: getDay() returns 0 on Sunday
if (key === 'a') {
return ['日', '一', '二', '三', '四', '五', '六'][value]
}
if (result.length > 0 && value < 10) {
value = '0' + value
}
return value || 0
})
return time_str
}另外wxml中使用的一些wxss公共样式就不提供了。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。
