这期内容当中小编将会给大家带来有关微信小程序自定义日期选择器的示例分析，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。
日期选择器是我们在写项目的过程中经常遇到的，有需要的选择器，也有不需要的选择器
今天给大家带来一个自定义的时间选择器，废话不多说，直接上代码
第一步：先创建一个picker的文件夹
第二步 ：在wxml中写布局样式
<!--picker/picker.wxml--><view class="full-box {{isOpen?'cur':''}}"> <!--<view class="modal" bindtap="tapModal"></view>--> <view class="picker"> <view class="picker-header"> <view bindtap="cancle" > <text>{{cancelText}}</text> </view> <text >{{titleText}}</text> <view bindtap="sure"> <text >{{sureText}}</text> </view> </view> <picker-view value="{{value}}" class="picker-content" bindpickstart="_bindpickstart" bindchange="_bindChange" bindpickend="_bindpickend" indicator- mask- > <picker-view-column wx:for="{{columnsData}}" wx:key="{{index}}"> <view wx:for="{{item}}" wx:for-item="itemIn" class="picker-line" wx:key="{{index}}"> <text class="line1">{{isUseKeywordOfShow?itemIn[keyWordsOfShow]:itemIn}}</text> </view> </picker-view-column> </picker-view> </view></view>第三步：wxss中添加样式
.full-box{ position: fixed; left: 0; right: 0; bottom: 0; top: 0; z-index: 9999; opacity: 0; background:rgba(0,0,0,.4); transition:all .4s ease-in-out 0; pointer-events:none;}.full-box.cur{ opacity:1; pointer-events:auto} .modal{ position: absolute; width: 100%; height: 50%; bottom:-50%; left: 0; background: transparent; transition:all .4s ease-in-out 0;} .picker{ position: absolute; width: 100%; height: 235px; bottom: -235px; left: 0; background: #fff; display: flex; flex-direction: column; transition:all .4s ease-in-out 0;} .cur .picker{ bottom:0;}.cur .modal{ bottom:50%;}.picker-line{ display: flex; justify-content: center; align-items: center;}.picker-header { height: 20%; box-sizing: border-box; padding: 0 20rpx; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid #eeeeee;}.picker-header view { height: 100%; display: flex; justify-content: center; align-items: center;}.picker-header view text{ font-size: 36rpx;}.picker-content { flex-grow: 1;}.line1{ overflow: hidden; text-overflow: ellipsis; white-space: nowrap; lines:1}第四步：在js中写组件的属性
// picker/picker.jsimport { isPlainObject } from './tool' Component({ properties: { scrollType: { type: String, value: 'normal'// "link": scroll间联动 "normal": scroll相互独立 }, listData: { type: Array, value: [], observer: function(newVal) { if (newVal.length === 0 || this._compareDate()) return this._setTempData() const tempArr = [...new Array(newVal.length).keys()].map(() => 0) this.data.lastValue = this.data.tempValue = tempArr this._setDefault() // let {defaultPickData} = this.properties; // if(newVal.length === 0) return; // // this._setDefault(newVal, defaultPickData) } }, defaultPickData: { type: Array, value: [], observer: function(newVal) { if (newVal.length === 0 || this._compareDate()) return this._setTempData() this._setDefault() } }, keyWordsOfShow: { type: String, value: 'name' }, isShowPicker: { type: Boolean, value: false, observer: function(newVal) { if (newVal) { this._openPicker() } else { this._closePicker() } } }, titleText: {// 文案 type: String, value: '请选择到馆日期' }, cancelText: {// 取消按钮文案 type: String, value: '取消' }, sureText: {// 确定按钮文案 type: String, value: '确定' }, }, data: { columnsData: [], value: [], backData: [], height: 0, isOpen: false, isUseKeywordOfShow: false, scrollEnd: true, // 滚动是否结束 lastValue: [], // 上次各个colum的选择索引 tempValue: [], isFirstOpen: true, onlyKey: '', defaultPickDataTemp: '', listDataTemp: '' }, methods: { tapModal() { this.properties.isShowPicker = false this._closePicker() }, cancle() { this.triggerEvent('cancle') this._closePicker() }, sure() { const { scrollEnd, tempValue } = this.data if (!scrollEnd) return const backData = this._getBackDataFromValue(tempValue) this.setData({ backData }) this.triggerEvent('sure', { choosedData: backData, choosedIndexArr: tempValue }) this._closePicker() }, _bindChange(e) { const { scrollType } = this.properties const { lastValue } = this.data let val = e.detail.value switch (scrollType) { case 'normal': this.data.tempValue = val.concat() this.data.tempValue = val.concat() break case 'link': // let column_02 = this._getColumnData(this.properties.listData[val[0]].children); // let column_03 = this._getColumnData(this.properties.listData[val[0]].children[val[1]].children); var tempArray = [] if (val.length > 1) { val.slice(0, val.length - 1).reduce((t, c, i) => { const v = t[c].children tempArray.push(this._getColumnData(v)) return v }, this.properties.listData) } // let columnsData = [this.data.columnsData[0],column_02,column_03]; var columnsData = [this.data.columnsData[0], ...tempArray] // 设置value关联 var compareIndex = this._getScrollCompareIndex(lastValue, val) if (compareIndex > -1) { let tempI = 1 while (val[compareIndex + tempI] !== undefined) { val[compareIndex + tempI] = 0 tempI++ } } val = this._validate(val) this.data.lastValue = val.concat() this.data.tempValue = val.concat() this.setData({ columnsData // value: val }) } }, _validate(val) { const { columnsData } = this.data columnsData.forEach((v, i) => { if (columnsData[i].length - 1 < val[i]) { val[i] = columnsData[i].length - 1 } }) this.setData({ value: val }) return val }, _bindpickend() { this.data.scrollEnd = true }, _bindpickstart() { this.data.scrollEnd = false }, _openPicker() { if (!this.data.isFirstOpen) { if (this.properties.listData.length !== 0) { this._setDefault(this._computedBackData(this.data.backData)) } } this.data.isFirstOpen = false this.setData({ isOpen: true }) }, _closePicker() { this.setData({ isOpen: false }) }, _getColumnData(arr) { return arr.map((v) => this._fomateObj(v)) }, _fomateObj(o) { const tempO = {} for (const k in o) { k !== 'children' && (tempO[k] = o[k]) } return tempO }, _getScrollCompareIndex(arr1, arr2) { let tempIndex = -1 for (let i = 0, len = arr1.length; i < len; i++) { if (arr1[i] !== arr2[i]) { tempIndex = i break } } return tempIndex }, // 根据id获取索引 _getIndexByIdOfObject(listData, idArr, key, arr) { if (!Array.isArray(listData)) return for (let i = 0, len = listData.length; i < len; i++) { if (listData[i][key] === idArr[arr.length][key]) { arr.push(i) return this._getIndexByIdOfObject(listData[i].children, idArr, key, arr) } } }, _setDefault(inBackData) { const { scrollType } = this.properties let { listData, defaultPickData } = this.properties const { lastValue } = this.data if (inBackData) { defaultPickData = inBackData } let backData = [] switch (scrollType) { case 'normal': if (isPlainObject(listData[0][0])) { this.setData({ isUseKeywordOfShow: true }) } if (Array.isArray(defaultPickData) && defaultPickData.length > 0) { backData = listData.map((v, i) => v[defaultPickData[i]]) this.data.tempValue = defaultPickData this.data.lastValue = defaultPickData } else { backData = listData.map((v) => v[0]) } this.setData({ columnsData: listData, backData: backData, value: defaultPickData }) break case 'link': // let column_01 = this._getColumnData(newVal); // let column_02 = this._getColumnData(newVal[0].children); // let column_03 = this._getColumnData(newVal[0].children[0].children); // let columnsData = [column_01,column_02,column_03]; var columnsData = [] // 如果默认值 if (Array.isArray(defaultPickData) && defaultPickData.length > 0 && defaultPickData.every((v, i) => isPlainObject(v))) { const key = this.data.onlyKey = Object.keys(defaultPickData[0])[0] const arr = [] this._getIndexByIdOfObject(listData, defaultPickData, key, arr) defaultPickData = arr let tempI = 0 do { lastValue.push(defaultPickData[tempI]) columnsData.push(this._getColumnData(listData)) listData = listData[defaultPickData[tempI]].children tempI++ } while (listData) backData = columnsData.map((v, i) => v[defaultPickData[i]]) // 如果没有默认值 } else { this.data.onlyKey = this.properties.keyWordsOfShow || 'name' do { lastValue.push(0) columnsData.push(this._getColumnData(listData)) listData = listData[0].children } while (listData) backData = columnsData.map((v) => v[0]) } this.data.tempValue = defaultPickData this.data.lastValue = defaultPickData this.setData({ isUseKeywordOfShow: true, columnsData, backData }) setTimeout(() => { this.setData({ value: defaultPickData }) }, 0) break } }, _computedBackData(backData) { const { scrollType, listData } = this.properties const { onlyKey } = this.data if (scrollType === 'normal') { return backData.map((v, i) => listData[i].findIndex((vv, ii) => this._compareObj(v, vv))) } else { const t = backData.map((v, i) => { const o = {} o[onlyKey] = v[onlyKey] return o }) return t } }, _compareObj(o1, o2) { const { keyWordsOfShow } = this.properties if (typeof o1 !== 'object') { return o1 === o2 } else { return o1[keyWordsOfShow] === o2[keyWordsOfShow] } }, _getBackDataFromValue(val) { let tempArr = [] if (val.length > 0) { tempArr = this.data.columnsData.reduce((t, v, i) => { return t.concat(v[val[i]]) }, []) } else { tempArr = this.data.columnsData.map((v, i) => v[0]) } return tempArr }, _compareDate() { // 完全相等返回true const { defaultPickDataTemp, listDataTemp } = this.data const { defaultPickData, listData } = this.properties return defaultPickDataTemp === defaultPickData && listDataTemp === listData }, _setTempData() { const { defaultPickData, listData } = this.properties this.data.defaultPickDataTemp = defaultPickData this.data.listDataTemp = listData } }})第五步：创建一个tool.js文件
function _typeof(obj) { return Object.prototype.toString.call(obj).slice(8, -1).toLowerCase();}function isString(obj) { //是否字符串 return _typeof(obj) === 'string'}function isPlainObject(obj) { return _typeof(obj) === 'object';}module.exports = { isString, isPlainObject}第六步：在所需的页面的json中进行引用
{ "usingComponents": { "picker": "../../picker/picker" }}第七步：在所需的页面的wxml中写入布局
<button bindtap="showPicker_11">时间的五列联动picker</button><view>选择数据：{{picker_11_data}}</view><view>选择索引：{{picker_11_index}}</view><picker isShowPicker="{{isShow_11}}" keyWordsOfShow="name" bindsure="sureCallBack_11" bindcancle="cancleCallBack_11" scrollType="link" listData="{{listData_11}}"></picker>第八步：在所需的页面的js中调用我们的自定义选择器
// pages/index/index.jsimport { times } from './time.js';Page({ data: { isShow_11: false, listData_11:times, picker_11_data:[], }, onLoad () { setTimeout(() => { this.setData({ defaultPickData_08:[ {code:'110000'},{code:'110100'},{code:'110101'} ] }) },3000) }, showPicker_11: function () { this.setData({ isShow_11: true, }) }, sureCallBack_11 (e) { let data = e.detail console.log("data",data); this.setData({ isShow_11: false, picker_11_data: JSON.stringify(e.detail.choosedData), picker_11_index:JSON.stringify(e.detail.choosedIndexArr) }) }, cancleCallBack_11 () { this.setData({ isShow_11: false }) }, })第九步：创建一个time.js的文件
const times =[ { name:'2021年', id:1, children:[ { name:'1月', id:11, children:[ { name:'1日', id:111, children:[ { name:'1时', id:1111, children:[ { name:'1分', id:11111, }, { name:'2分', id:11112, }, ] }, ] }, { name:'2日', id:112, children:[ { name:'1时', id:1121, children:[ { name:'1分', id:11111, }, { name:'2分', id:11112, }, ] }, { name:'2时', id:1121, }, ] }, { name:'3日', id:113, children:[ { name:'小', id:1131, }, { name:'大', id:1132 }, ] } ] }, { name:'2月', id:12, children:[ { name:'1日', id:121, children:[ { name:'1时', id:1121, children:[ { name:'1分', id:11111, }, { name:'2分', id:11112, }, ] }, { name:'2时', id:1121, }, ] }, { name:'2日', id:122, children:[ { name:'1时', id:1121, children:[ { name:'1分', id:11111, }, { name:'2分', id:11112, }, ] }, { name:'2时', id:1121, }, ] }, { name:'3日', id:123, children:[ { name:'1时', id:1121, children:[ { name:'1分', id:11111, }, { name:'2分', id:11112, }, ] }, { name:'2时', id:1121, }, ] } ] } ]},{ name:'2022年', id:1, children:[ { name:'1月', id:11, children:[ { name:'1日', id:111, children:[ { name:'1时', id:1111, children:[ { name:'1分', id:11111, }, { name:'2分', id:11112, }, ] }, ] }, { name:'2日', id:112, children:[ { name:'1时', id:1121, children:[ { name:'1分', id:11111, }, { name:'2分', id:11112, }, ] }, { name:'2时', id:1121, }, ] }, { name:'3日', id:113, children:[ { name:'小', id:1131, }, { name:'大', id:1132 }, ] } ] }, { name:'2月', id:12, children:[ { name:'1日', id:121, children:[ { name:'1时', id:1121, children:[ { name:'1分', id:11111, }, { name:'2分', id:11112, }, ] }, { name:'2时', id:1121, }, ] }, { name:'2日', id:122, children:[ { name:'1时', id:1121, children:[ { name:'1分', id:11111, }, { name:'2分', id:11112, }, ] }, { name:'2时', id:1121, }, ] }, { name:'3日', id:123, children:[ { name:'1时', id:1121, children:[ { name:'1分', id:11111, }, { name:'2分', id:11112, }, ] }, { name:'2时', id:1121, }, ] } ] } ]},]module.exports = { times,}完成上述步骤后，一个自定义的日期选择器就完成了
上述就是小编为大家分享的微信小程序自定义日期选择器的示例分析了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注编程网行业资讯频道。
