微信小程序的农历选择器

背景

小程序出来已经有一段时间了,能看到微信团队对小程序的期望非常大,API也越来越丰富.我个人也是非常看好这个方向,虽然现在还不是特别火,但只要有合适的场景,我相信小程序一定会爆发的(看看最近的”跳一跳”有多火).我自己也做了一个小程序,用于生日提醒(可以扫描上面的二维码试用一下).做的过程中碰到了一个小问题,就是小程序没有原生的农历日期选择器.于是就自己做了一个,有需要的朋友可以直接拿去用.

Code

小程序官方组件中有个叫picker的选择器组件,我的思路就是基于mode = multiSelector的方式来做的.

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<view class="weui-cell__bd">
<picker name="lunarPicker" mode="multiSelector" bindchange="bindLunarPickerChange" bindcolumnchange="bindLunarPickerColumnChange" value="{{lunarIndex}}" range="{{lunarArray}}" range-key="name">
<view class="weui-input">{{lunarDate}}</view>
</picker>
</view>

这里会用到两个方法

  • bindLunarPickerChange
  • bindLunarPickerColumnChange

在对应的js文件中是这样的:

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Page({
data: {
lunarArray: [],
lunarIndex: [],
lunarDate: "loading..."
},

bindLunarPickerChange: function (e) {
let pickerIndex = e.detail.value;
this.setData({
lunarIndex: pickerIndex,
lunarDate: lunarCalendar.getDisplayNameByPickerIndex(this.data.lunarArray, pickerIndex)
});
},

bindLunarPickerColumnChange: function (e) {
let list = this.data.lunarArray;
if (e.detail.column == 0) {
let year = list[0][e.detail.value].id;
this.setData({
lunarArray: lunarCalendar.rebuildPickerArrayOnYearChange(list, year),
lunarIndex: [e.detail.value, 0, 0]
});
} else if (e.detail.column == 1) {
let month = list[1][e.detail.value].id;
let year = list[0][this.data.lunarIndex[0]].id;
let isLeap = list[1][e.detail.value].name.charAt(0) == '闰' ? true : false;
this.setData({
lunarArray: lunarCalendar.rebuildPickerArrayOnMonthChange(list, year, month, isLeap),
lunarIndex: [this.data.lunarIndex[0], e.detail.value, 0]
});
}
},

onLoad: function (options) {
//默认初始化到1990-01-01
let initIndex = [90, 0, 0];
let initList = lunarCalendar.initPickerArray(1990);
that.setData({
lunarArray: initList,
lunarIndex: initIndex,
lunarDate: lunarCalendar.getDisplayNameByPickerIndex(initList, initIndex)
});
},

});

工具类:

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/**
* 农历工具类,支持1900到2100
*/
var lunarCalendar = {

/**
* 农历1900-2100的信息表(包含闰月,以及月天数等信息)
*/
metaArray: [
0x04bd8, 0x04ae0, 0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2, //1900-1909
0x04ae0, 0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0, 0x0ada2, 0x095b0, 0x14977, //1910-1919
0x04970, 0x0a4b0, 0x0b4b5, 0x06a50, 0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970, //1920-1929
0x06566, 0x0d4a0, 0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0, 0x1c8d7, 0x0c950, //1930-1939
0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4, 0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557, //1940-1949
0x06ca0, 0x0b550, 0x15355, 0x04da0, 0x0a5b0, 0x14573, 0x052b0, 0x0a9a8, 0x0e950, 0x06aa0, //1950-1959
0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260, 0x0f263, 0x0d950, 0x05b57, 0x056a0, //1960-1969
0x096d0, 0x04dd5, 0x04ad0, 0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b6a0, 0x195a6, //1970-1979
0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46, 0x0ab60, 0x09570, //1980-1989
0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0, //1990-1999
0x0c960, 0x0d954, 0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0, 0x092d0, 0x0cab5, //2000-2009
0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9, 0x04ba0, 0x0a5b0, 0x15176, 0x052b0, 0x0a930, //2010-2019
0x07954, 0x06aa0, 0x0ad50, 0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260, 0x0ea65, 0x0d530, //2020-2029
0x05aa0, 0x076a3, 0x096d0, 0x04afb, 0x04ad0, 0x0a4d0, 0x1d0b6, 0x0d250, 0x0d520, 0x0dd45, //2030-2039
0x0b5a0, 0x056d0, 0x055b2, 0x049b0, 0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0, //2040-2049
0x14b63, 0x09370, 0x049f8, 0x04970, 0x064b0, 0x168a6, 0x0ea50, 0x06b20, 0x1a6c4, 0x0aae0, //2050-2059
0x0a2e0, 0x0d2e3, 0x0c960, 0x0d557, 0x0d4a0, 0x0da50, 0x05d55, 0x056a0, 0x0a6d0, 0x055d4, //2060-2069
0x052d0, 0x0a9b8, 0x0a950, 0x0b4a0, 0x0b6a6, 0x0ad50, 0x055a0, 0x0aba4, 0x0a5b0, 0x052b0, //2070-2079
0x0b273, 0x06930, 0x07337, 0x06aa0, 0x0ad50, 0x14b55, 0x04b60, 0x0a570, 0x054e4, 0x0d160, //2080-2089
0x0e968, 0x0d520, 0x0daa0, 0x16aa6, 0x056d0, 0x04ae0, 0x0a9d4, 0x0a2d0, 0x0d150, 0x0f252, //2090-2099
0x0d520
], //2100

zodiacArray: ["猴", "鸡", "狗", "猪", "鼠", "牛", "虎", "兔", "龙", "蛇", "马", "羊"],
monthArray: ['正月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '冬月', '腊月'],
dayArray: ["初一", "初二", "初三", "初四", "初五", "初六", "初七", "初八", "初九", "初十", "十一", "十二", "十三", "十四", "十五", "十六", "十七", "十八", "十九", "二十", "廿一", "廿二", "廿三", "廿四", "廿五", "廿六", "廿七", "廿八", "廿九", "三十"],

toChinaYear: function (y) {
return lunarCalendar.zodiacArray[y % 12];
},

toChinaMonth: function (m) {
return lunarCalendar.monthArray[m - 1];
},

toChinaDay: function (d) {
return lunarCalendar.dayArray[d - 1];
},

/**
* 计算指定年的闰月月份,如果该年没有闰月,则返回0
*/
getLeapMonth: function (y) {
return (lunarCalendar.metaArray[y - 1900] & 0xf);
},


/**
* 计算指定年,月的天数
*/
getDayCountOfMonth: function (y, m, isLeap) {
if (isLeap) {
let leapMonth = lunarCalendar.getLeapMonth(y);
if (leapMonth != 0 && leapMonth == m) {
return ((lunarCalendar.metaArray[y - 1900] & 0x10000) ? 30 : 29);
}
} else {
return ((lunarCalendar.metaArray[y - 1900] & (0x10000 >> m)) ? 30 : 29);
}
},

/**
* 默认生成1900到2100的年列表,这里改需要metaAArray的支持
*/
buildYearList: function () {
let list = [];
for (let i = 1900; i <= 2100; i++) {
list.push({
id: i,
name: i + "[" + lunarCalendar.toChinaYear(i) + "]"
});
}
return list;
},


/**
* 根据年生成月列表
*/
buildMonthList: function (y) {
let list = [];
for (let i = 1; i <= 12; i++) {
list.push({
id: i,
name: lunarCalendar.toChinaMonth(i)
})
}
let leapMonth = lunarCalendar.getLeapMonth(y);
if (leapMonth != 0) {
list.splice(leapMonth, 0, {
id: leapMonth,
name: "闰" + lunarCalendar.toChinaMonth(leapMonth)
})
}
return list;
},

buildDayList: function (y, m, isLeap) {
let list = [];
let dayCount = lunarCalendar.getDayCountOfMonth(y, m, isLeap);
for (let i = 1; i <= dayCount; i++) {
list.push({
id: i,
name: lunarCalendar.toChinaDay(i)
})
}
return list;
},

initPickerArray: function (y) {
let list = [];
list[0] = lunarCalendar.buildYearList();
list[1] = lunarCalendar.buildMonthList(y);
list[2] = lunarCalendar.buildDayList(y, 1, false);
return list;
},

rebuildPickerArrayOnYearChange: function (list, y) {
list[1] = lunarCalendar.buildMonthList(y);
list[2] = lunarCalendar.buildDayList(y, 1, false);
return list;
},
rebuildPickerArrayOnMonthChange: function (list, y, m, isLeap) {
list[2] = lunarCalendar.buildDayList(y, m, isLeap);
return list;
},

getDisplayNameByPickerIndex: function (list, indexList) {
return list[0][indexList[0]].name + " " + list[1][indexList[1]].name + " " + list[2][indexList[2]].name;
}

};