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date-picker.js
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/**
* Created by ZLY on 2017/5/8.
*/
(function (window) {
var datePicker = {
selectDate: 0, // 选中年月
TARGET: null,
targetPosition: {},
PICKERBOX: null,
today: 0,
currentYear: 0, // 当前年
currentMonth: 0, // 当前月
// currentDay: 0, // 当前日
firstDay: 0, // 本月第一天周几
preMonthTotalCount: 0, // 上个月总共几天
prevMonthCount: 0, // 需要显示上个月的天数
lastDay: 0, // 本月最后一天周几
lastDate: 0, // 本月最后一天是几号
nextMonthCount: 0, // 需要显示下个月的天数
dataArr: [], // 渲染数据
init: function ($ele) {
// 赋值当前年月
this.today = new Date();
this.TARGET = document.getElementById($ele);
this._insertPicker();
this._getYearAndMonth();
this._addEvent();
},
_getYearAndMonth: function (year, month) {
this.currentYear = year || this.today.getFullYear();
this.currentMonth = month || this.today.getMonth() + 1;
this.preMonthTotalCount = (new Date(this.currentYear, this.currentMonth - 1, 0)).getDate();
this._getFirstDay();
this._getLastDay();
this._getDataArr();
this._renderHtml();
},
_getFirstDay: function () { // 计算第一天周几
this.firstDay = (new Date(this.currentYear, this.currentMonth - 1, 1)).getDay();
this.prevMonthCount = this.firstDay
},
_getLastDay: function () {
var date = new Date(this.currentYear, this.currentMonth, 0);
this.lastDay = date.getDay();
this.lastDate = date.getDate();
this.nextMonthCount = 6 - this.lastDay;
},
_getDataArr: function () {
// 清空数据
this.dataArr = [];
for (var i = 0; i < 7 * 6; i++) {
// 减去上个月显示的天数，才是这个月显示的
var date = i - this.prevMonthCount + 1;
var showDate = date;
var thisMonth = this.currentMonth;
if (date <= 0) { // 上一个月
thisMonth -= 1;
showDate = this.preMonthTotalCount + date;
} else if (date > this.lastDate) { // 下一个月
thisMonth += 1;
showDate = showDate - this.lastDate;
}
if (thisMonth === 0) thisMonth = 12;
if (thisMonth === 13) thisMonth = 1;
this.dataArr.push({
date: date,
month: thisMonth,
showDate: showDate
});
}
},
_renderHtml: function () {
var html = '<div class="date-picker-ui-header">' +
'<a href="javascript:;" class="date-picker-ui-btn date-picker-ui-prev"><</a>' +
'<a href="javascript:;" class="date-picker-ui-btn date-picker-ui-next">></a>' +
'<span>' + this.currentYear + '-' + (this.currentMonth < 9 ? '0' + this.currentMonth : this.currentMonth) + '</span>' +
'<b class="date-picker-ui-btn-hidden">×</b>' +
'</div>' +
'<div class="date-picker-ui-body">' +
'<table>' +
'<thead>' +
'<tr>' +
'<th>日</th>' +
'<th>一</th>' +
'<th>二</th>' +
'<th>三</th>' +
'<th>四</th>' +
'<th>五</th>' +
'<th>六</th>' +
'</tr>' +
'</thead>' +
'<tbody>';
for (var i = 0, len = this.dataArr.length; i < len; i++) {
var className = '';
var date = this.dataArr[i];
if (date.date > 0 && date.date <= this.lastDate) {
className = "currentMonth";
}
if (i % 7 === 0)
html += "<tr>";
html += "<td class='" + className + "'data-month='" + date.month + "'data-date='" + date.date + "'>" + date.showDate + "</td>";
if (i % 7 === 6)
html += "</tr>";
}
html += '</tbody>' +
'</table>' +
'</div>';
this.PICKERBOX.innerHTML = html;
},
_getTargetPosition: function () {
this.targetPosition.left = this.TARGET.offsetLeft;
this.targetPosition.top = this.TARGET.offsetTop + this.TARGET.offsetHeight + 2;
},
// 插入操作
_insertPicker: function () {
this._getTargetPosition();
this.PICKERBOX = document.createElement("div");
this.PICKERBOX.id = "date-picker-wrapper";
this.PICKERBOX.style.top = this.targetPosition.top + 'px';
this.PICKERBOX.style.left = this.targetPosition.left + 'px';
document.getElementsByTagName("body")[0].appendChild(this.PICKERBOX);
},
_addEvent: function () { // 添加事件
var self = this;
this.PICKERBOX.addEventListener('click', function (e) {
var target = e.target || window.event.target;
if (target.nodeName === 'A') {
if (target.className.indexOf("ui-next") > -1) {
if ((self.currentMonth += 1) > 12) {
self.currentMonth = 1;
self.currentYear += 1;
}
} else {
if ((self.currentMonth -= 1) <= 0) {
self.currentMonth = 12;
self.currentYear -= 1;
}
}
self._getYearAndMonth(self.currentYear, self.currentMonth);
}
if (target.nodeName === 'TD' && target.className.indexOf("currentMonth") > -1) {
self.selectDate = self.currentYear + '-' + target.getAttribute("data-month") + '-' + target.getAttribute("data-date");
self.TARGET.innerHTML = self.selectDate;
self.TARGET.value = self.selectDate;
// self._toggleClass();
}
if (target.nodeName === 'B') {
self._toggleClass();
}
}, false);
self.TARGET.addEventListener("click", self._toggleClass.bind(self), false);
},
// 控制显示
_toggleClass: function () {
this.PICKERBOX.className =
this.PICKERBOX.className.indexOf("show") > 0 ? "" : "picker-show";
}
}
window.datePicker = datePicker;
}(window));