微信小程式日期選擇器使用詳解

2022-07-11 10:01:15

本文範例為大家分享了微信小程式日期選擇器的具體程式碼，供大家參考，具體內容如下

需求：在小程式開發中，時常會遇到日期選擇器、時間選擇器或者地區選擇器來進行選擇的功能。往往設計圖上面並不是按部就班沿用官方提供那種控制元件樣式來實現顯示，比如：樣式會多樣化、功能會複雜化。這時我們就要自己寫一個適合需求的元件。

下面跟大家分享下我寫的一個自定義日期選擇器元件

首先上效果圖看看:

主要步驟：

第一步：首先自定義選擇器元件需要用到picker-view跟picker-view-column。使用方法如下~

<picker-view indicator-class="picker-indicator" value="{{pickerIndexList}}" bindchange="bindChangeDate">
    <picker-view-column>
        <view wx:for="{{yearList}}" wx:key="index" class="{{pickerIndexList[0]==index?'txt-active':''}}">{{item}}年</view>
    </picker-view-column>
    <picker-view-column>
        <view wx:for="{{monthList}}" wx:key="index" class="{{pickerIndexList[1]==index?'txt-active':''}}">{{item}}月</view>
    </picker-view-column>
    <picker-view-column>
        <view wx:for="{{dayList}}" wx:key="index" class="{{pickerIndexList[2]==index?'txt-active':''}}">{{item}}日</view>
    </picker-view-column>
</picker-view>

第二步：開啟選擇器時就要獲取到當前的年月日，我這裡使用了for遍歷直接生成年份陣列跟月份陣列。注：天數根據年份跟月份動態生成

//獲取當前日期
  getCurrentDate: function (e) {
    var that = this;
    var yearList = [], monthList = [], dayList = [];
    for (var i = new Date().getFullYear(); i <= 2050; i++) {//年份
      yearList.push(i);
    }
    for (var i = 1; i <= 12; i++) {//月份
      monthList.push(i);
    }
    var myDate = new Date();
    var currentYearIndex = yearList.findIndex(o => o == myDate.getFullYear());
    var currentMonthIndex = monthList.findIndex(o => o == myDate.getMonth() + 1);
    var dayList = that.getDayList(currentYearIndex, currentMonthIndex);//天
    var currentDayIndex = dayList.findIndex(o => o == myDate.getDate());
    var pickerIndexList = that.data.pickerIndexList;
    pickerIndexList[0] = currentYearIndex;
    pickerIndexList[1] = currentMonthIndex;
    pickerIndexList[2] = currentDayIndex;
    app.globalData.dateIndexList = pickerIndexList;
    that.setData({
      yearList,
      monthList,
      dayList,
    })
  },

第三步：在選擇的過程中，選擇器有個改變事件，當年份或者月份改變的時候，天數要隨之變化

//日期選擇改變事件
 bindChangeDate: function (e) {
    var that = this;
    var pickerColumnList = e.detail.value;
    that.setData({
      dayList: that.getDayList(pickerColumnList[0], pickerColumnList[1]),
      pickerIndexList: pickerColumnList,
    })
 },

有個樣式的小問題：如選中行背景色寫在picker-view控制元件中，則會出現捲動時背景色也會隨著動，體驗不好。所以我這裡寫了一個預留位置，設定背景色，捲動選擇時背景色就不會受到影響

<!-- 選中行背景色 start-->
<view class="top-background">
    <view></view>
    <view></view>
    <view></view>
</view>
<!-- 選中行背景色 end-->

下面是全部程式碼~~

wxml：

<!-- 自定義選擇日期層 start -->
<view class="date-layer" wx:if="{{isShowDateLayer}}" catchtouchmove="catchTouchMove">
    <view class="layer-box">
        <view class="box-top">
            <!-- 選中行背景色 start-->
            <view class="top-background">
                <view></view>
                <view></view>
                <view></view>
            </view>
            <!-- 選中行背景色 end-->
            <picker-view indicator-class="picker-indicator" value="{{pickerIndexList}}" bindchange="bindChangeDate">
                <picker-view-column>
                    <view wx:for="{{yearList}}" wx:key="index" class="{{pickerIndexList[0]==index?'txt-active':''}}">{{item}}年</view>
                </picker-view-column>
                <picker-view-column>
                    <view wx:for="{{monthList}}" wx:key="index" class="{{pickerIndexList[1]==index?'txt-active':''}}">{{item}}月</view>
                </picker-view-column>
                <picker-view-column>
                    <view wx:for="{{dayList}}" wx:key="index" class="{{pickerIndexList[2]==index?'txt-active':''}}">{{item}}日</view>
                </picker-view-column>
            </picker-view>
        </view>
        <view class="box-bottom">
            <button class="btn-confirm" bindtap="bindConfirmDate">確定</button>
            <button class="btn-cancel" bindtap="bindCancelDate">取消</button>
        </view>
    </view>
</view>
<!-- 選擇日期層 end -->

js：

/**
   * 頁面的初始資料
   */
  data: {
    pickerIndexList: [0, 0, 0],//日期選擇器下標
    isShowDateLayer: false,//是否顯示日期彈層
    txtDate: '請選擇提貨日期',//選中日期
    isSeltDate: false,//是否選擇日期
  },

  // 截獲豎向滑動
  catchTouchMove: function (res) {
    return true;
  },

  //獲取天數列表
  getDayList: function (year, month) {
    var that = this;
    var dayList;
    switch (month + 1) {
      case 1:
      case 3:
      case 5:
      case 7:
      case 8:
      case 10:
      case 12: dayList = that.getDayNum(31);
        break;
      case 4:
      case 6:
      case 9:
      case 11: dayList = that.getDayNum(30);
        break;
      case 2: dayList = that.getDayNum((that.data.yearList[year] % 4 == 0 && that.data.yearList[year] % 100 != 0 || that.data.yearList[year] % 400 == 0) ? 29 : 28);
        break;
    }
    return dayList;
  },

  //獲取天數
  getDayNum: function (num) {
    var dayList = [];
    for (var i = 1; i <= num; i++) {
      dayList.push(i);
    }
    return dayList;
  },

  //開啟選擇日期彈層
  bindOpenDateLayer: function (e) {
    var that = this;
    var pickerIndexList = that.data.pickerIndexList;
    that.setData({
      isShowDateLayer: !that.data.isShowDateLayer,
      dayList: that.getDayList(pickerIndexList[0], pickerIndexList[1]),
    })
  },

  //日期選擇改變事件
  bindChangeDate: function (e) {
    var that = this;
    var pickerColumnList = e.detail.value;
    that.setData({
      dayList: that.getDayList(pickerColumnList[0], pickerColumnList[1]),
      pickerIndexList: pickerColumnList,
    })
  },

  //選擇日期彈層確定按鈕
  bindConfirmDate: function (e) {
    var that = this;
    var pickerIndexList = that.data.pickerIndexList;
    var txtDate = that.data.yearList[pickerIndexList[0]] + '-' + that.data.monthList[pickerIndexList[1]] + '-' + that.data.dayList[pickerIndexList[2]];
    that.setData({
      isShowDateLayer: false,
      pickerIndexList,
      txtDate,
      isSeltDate: true,
    })
  },

  //選擇日期彈層取消按鈕
  bindCancelDate: function (e) {
    var that = this;
    var pickerIndexList = that.data.pickerIndexList;
    that.setData({
      isShowDateLayer: !that.data.isShowDateLayer,
    })
    var yearList = that.data.yearList;
    var monthList = that.data.monthList;
    var txtDate = that.data.txtDate;
    var yearIndex = yearList.findIndex(o => o == parseInt(txtDate.slice(0, txtDate.indexOf('-'))));//年份下標
    var monthIndex = monthList.findIndex(o => o == parseInt(txtDate.slice(txtDate.indexOf('-') + 1, txtDate.lastIndexOf('-'))));//月份下標
    var dayList = that.getDayList(yearIndex, monthIndex);//天數
    if (that.data.isSeltDate) {//選擇過日期
      if (txtDate == (yearList[pickerIndexList[0]] + '-' + monthList[pickerIndexList[1]] + '-' + dayList[pickerIndexList[2]]))
        that.setData({ pickerIndexList })
      else
        that.setData({ pickerIndexList: [yearIndex, monthIndex, dayList.findIndex(o => o == parseInt(txtDate.slice(txtDate.lastIndexOf('-') + 1, txtDate.length)))] })
    } else {//未選擇過日期
      that.setData({
        pickerIndexList: app.globalData.dateIndexList,
      })
    }
  },

  //阻止冒泡事件
  catchLayer: function (e) { },

  //獲取當前日期
  getCurrentDate: function (e) {
    var that = this;
    var yearList = [], monthList = [], dayList = [];
    for (var i = new Date().getFullYear(); i <= 2050; i++) {//年份
      yearList.push(i);
    }
    for (var i = 1; i <= 12; i++) {//月份
      monthList.push(i);
    }
    var myDate = new Date();
    var currentYearIndex = yearList.findIndex(o => o == myDate.getFullYear());
    var currentMonthIndex = monthList.findIndex(o => o == myDate.getMonth() + 1);
    var dayList = that.getDayList(currentYearIndex, currentMonthIndex);//天
    var currentDayIndex = dayList.findIndex(o => o == myDate.getDate());
    var pickerIndexList = that.data.pickerIndexList;
    pickerIndexList[0] = currentYearIndex;
    pickerIndexList[1] = currentMonthIndex;
    pickerIndexList[2] = currentDayIndex;
    app.globalData.dateIndexList = pickerIndexList;
    that.setData({
      yearList,
      monthList,
      dayList,
    })
  },

  /**
   * 生命週期函數--監聽頁面載入
   */
  onLoad: function (options) {
    var that = this;
    that.getCurrentDate();//獲取當前時間
    that.setData({
      pickerIndexList: that.data.pickerIndexList
    })
  },

wxss：

/* 日期選擇彈框 start */
.main .date-layer {
  height: 100%;
  width: 100%;
  background: rgba(0, 0, 0, 0.65);
  position: fixed;
  top: 0;
  z-index: 20;
}

.date-layer .layer-box {
  position: fixed;
  bottom: 0;
  width: 100%;
  background: #fff;
  border-top-left-radius: 24rpx;
  border-top-right-radius: 24rpx;
}

.date-layer .layer-box .box-top {
  padding: 30rpx 0;
  position: relative;
}

.date-layer .layer-box picker-view {
  height: 120px;
  width: 88%;
  margin: 0 auto;
}

.date-layer .layer-box .picker-indicator {
  height: 40px;
  line-height: 40px;
}

.date-layer .layer-box picker-view-column view {
  line-height: 42px;
  text-align: center;
  width: 96%;
  margin: 0 auto;
}

.date-layer .layer-box .box-top .top-background {
  height: 80rpx;
  width: 88%;
  margin: 0 auto;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
}

.layer-box .box-top .top-background view {
  height: 100%;
  width: 96%;
  margin: 0 auto;
  background: rgba(195, 218, 49, 0.12);
  border-top: 2rpx solid #D9E87D;
  border-bottom: 2rpx solid #C3DA31;
  margin: 0 4rpx;
  box-sizing: border-box;
}

.date-layer .layer-box .box-bottom {
  display: flex;
}

.date-layer .layer-box .box-bottom button {
  margin: 0;
  padding: 0;
  width: 50%;
  border-radius: 0;
  border: none;
  background: #fff;
  height: 100rpx;
  line-height: 100rpx;
  font-size: 34rpx;
  border-top: 2rpx solid #D8D8D8;
}

.date-layer .layer-box .box-bottom .btn-confirm {
  border-right: 1rpx solid #D8D8D8;
  color: #C3DA31;
}

.date-layer .layer-box .box-bottom .btn-cancel {
  border-left: 1rpx solid #D8D8D8;
  color: #B1B1B4;
}
/* 日期選擇彈框 end */

介紹到這裡就可以實現一個不管是自己還是設計圖都想要的選擇器啦

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援it145.com。

微信小程式日期選擇器使用詳解

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