WebCalendar.js

var cal;
var isFocus=false; //是否为焦点
var pickMode ={
    "second":1,
    "minute":2,
    "hour":3,
    "day":4,
    "month":5,
    "year":6 };

var topY=0,leftX=0; //自定义定位偏移量 2007-02-11 由寒羽枫添加
//选择日期 → 由寒羽枫 2007-06-10 添加，通过 ID 来选日期
function SelectDateById(id,strFormat,x,y)
{
    var obj = document.getElementById(id);
    if(obj == null){return false;}
    obj.focus();
    if(obj.onclick != null){obj.onclick();}
    else if(obj.click != null){obj.click();}
    else{SelectDate(obj,strFormat,x,y)}
}

//选择日期 → 由寒羽枫 2006-06-25 添加
function SelectDate(obj,strFormat,x,y)
{

    leftX =(x == null) ? leftX : x;
    topY =(y == null) ? topY : y;//自定义定位偏移量 2007-02-11 由寒羽枫添加
    if(document.getElementById("ContainerPanel")==null){InitContainerPanel();}
    var date = new Date();
    var by = date.getFullYear()-50; //最小值 → 50 年前
    var ey = date.getFullYear()+50; //最大值 → 50 年后
    //cal = new Calendar(by, ey,1,strFormat);    //初始化英文版，0 为中文版
    cal = (cal==null) ? new Calendar(by, ey, 0) : cal;    //不用每次都初始化 2006-12-03 修正
    cal.DateMode =pickMode["second"]; //复位
      if(strFormat.indexOf('s')< 0) {cal.DateMode =pickMode["minute"];}//精度为分
      if(strFormat.indexOf('m')< 0) {cal.DateMode =pickMode["hour"];}//精度为时
      if(strFormat.indexOf('h')< 0) {cal.DateMode =pickMode["day"];}//精度为日
      if(strFormat.indexOf('d')< 0) {cal.DateMode =pickMode["month"];}//精度为月
      if(strFormat.indexOf('M')< 0) {cal.DateMode =pickMode["year"];}//精度为年
      if(strFormat.indexOf('y')< 0) {cal.DateMode =pickMode["second"];}//默认精度为秒
    cal.dateFormatStyleOld = cal.dateFormatStyle;
    cal.dateFormatStyle = strFormat;
    cal.show(obj);
}
/**//**//**//**//**//**//**//**
* 返回日期
* @param d the delimiter
* @param p the pattern of your date
2006-06-25 由寒羽枫修改为根据用户指定的 style 来确定；
*/
String.prototype.toDate = function(style) {
var y = this.substring(style.indexOf('y'),style.lastIndexOf('y')+1);//年
var M = this.substring(style.indexOf('M'),style.lastIndexOf('M')+1);//月
var d = this.substring(style.indexOf('d'),style.lastIndexOf('d')+1);//日
var h = this.substring(style.indexOf('h'),style.lastIndexOf('h')+1);//时
var m = this.substring(style.indexOf('m'),style.lastIndexOf('m')+1);//分
var s = this.substring(style.indexOf('s'),style.lastIndexOf('s')+1);//秒

if(s == null ||s == "" || isNaN(s)) {s = new Date().getSeconds();}
if(m == null ||m == "" || isNaN(m)) {m = new Date().getMinutes();}
if(h == null ||h == "" || isNaN(h)) {h = new Date().getHours();}
if(d == null ||d == "" || isNaN(d)) {d = new Date().getDate();}
if(M == null ||M == "" || isNaN(M)) {M = new Date().getMonth()+1;}
if(y == null ||y == "" || isNaN(y)) {y = new Date().getFullYear();}
var dt ;
eval ("dt = new Date('"+ y+"', '"+(M-1)+"','"+ d+"','"+ h+"','"+ m+"','"+ s +"')");
return dt;
}

/**//**//**//**//**//**//**//**
* 格式化日期
* @param   d the delimiter
* @param   p the pattern of your date
* @author meizz
*/
Date.prototype.format = function(style) {
var o = {
    "M+" : this.getMonth() + 1, //month
    "d+" : this.getDate(),      //day
    "h+" : this.getHours(),     //hour
    "m+" : this.getMinutes(),   //minute
    "s+" : this.getSeconds(),   //second
    "w+" : "天一二三四五六".charAt(this.getDay()),   //week
    "q+" : Math.floor((this.getMonth() + 3) / 3), //quarter
    "S" : this.getMilliseconds() //millisecond
}
if(/(y+)/.test(style)) {
    style = style.replace(RegExp.$1,
    (this.getFullYear() + "").substr(4 - RegExp.$1.length));
}
for(var k in o){
    if(new RegExp("("+ k +")").test(style)){
      style = style.replace(RegExp.$1,
        RegExp.$1.length == 1 ? o[k] :
        ("00" + o[k]).substr(("" + o[k]).length));
    }
}
return style;
}

//2007-09-14 由寒羽枫添加返回所选日期
Calendar.prototype.ReturnDate = function(dt) {
    if (this.dateControl != null){this.dateControl.value = dt;}
    calendar.hide();
    if(this.dateControl.onchange == null){return;}
    //将 onchange 转成其它函数，以免触发验证事件
    var ev = this.dateControl.onchange.toString(); //找出函数的字串
    ev = ev.substring(
            ((ev.indexOf("ValidatorOnChange();")> 0) ? ev.indexOf("ValidatorOnChange();") + 20 : ev.indexOf("{") + 1)
                , ev.lastIndexOf("}"));//去除验证函数 ValidatorOnChange();
    var fun = new Function(ev);     //重新定义函数
    this.dateControl.changeEvent = fun;
    this.dateControl.changeEvent();//触发自定义 changeEvent 函数
}

/**//**//**//**//**//**//**//**
* 日历类
* @param   beginYear 1990
* @param   endYear   2010
* @param   lang      0(中文)|1(英语) 可自由扩充
* @param   dateFormatStyle "yyyy-MM-dd";
* @version 2006-04-01
* @author KimSoft (jinqinghua [at] gmail.com)
* @update
*/
function Calendar(beginYear, endYear, lang, dateFormatStyle) {
this.beginYear = 1950;
this.endYear = 2050;
this.lang = 0;            //0(中文) | 1(英文)
this.dateFormatStyle = "yyyy-MM-dd hh:mm:ss";

if (beginYear != null && endYear != null){
    this.beginYear = beginYear;
    this.endYear = endYear;
}
if (lang != null){
    this.lang = lang
}

if (dateFormatStyle != null){
    this.dateFormatStyle = dateFormatStyle
}

this.dateControl = null;
this.panel = this.getElementById("calendarPanel");
this.container = this.getElementById("ContainerPanel");
this.form = null;

this.date = new Date();
this.year = this.date.getFullYear();
this.month = this.date.getMonth();

this.day = this.date.getDate();
this.hour = this.date.getHours();
this.minute = this.date.getMinutes();
this.second = this.date.getSeconds();

this.colors = {
"cur_word"      : "#FFFFFF", //当日日期文字颜色
"cur_bg"        : "#00FF00", //当日日期单元格背影色
"sel_bg"        : "#FFCCCC", //已被选择的日期单元格背影色 2006-12-03 寒羽枫添加
"sun_word"      : "#FF0000", //星期天文字颜色
"sat_word"      : "#0000FF", //星期六文字颜色
"td_word_light" : "#333333", //单元格文字颜色
"td_word_dark" : "#CCCCCC", //单元格文字暗色
"td_bg_out"     : "#EFEFEF", //单元格背影色
"td_bg_over"    : "#FFCC00", //单元格背影色
"tr_word"       : "#FFFFFF", //日历头文字颜色
"tr_bg"         : "#666666", //日历头背影色
"input_border" : "#CCCCCC", //input控件的边框颜色
"input_bg"      : "#EFEFEF"   //input控件的背影色
}
/* //2008-01-29 放到了 show ，因为要做 pickMode 判断
this.draw();
this.bindYear();
this.bindMonth();
*/
//this.changeSelect();
//this.bindData(); //2006-12-30 由民工.砖家注释
}

/**//**//**//**//**//**//**//**
* 日历类属性（语言包，可自由扩展）
*/
Calendar.language = {
"year"   : [[""], [""]],
"months" : [["一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"],
        ["JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"]
         ],
"weeks" : [["日","一","二","三","四","五","六"],
        ["SUN","MON","TUR","WED","THU","FRI","SAT"]
         ],
"hour" : [["时"], ["H"]],
"minute" : [["分"], ["M"]],
"second" : [["秒"], ["S"]],
"clear" : [["清空"], ["CLS"]],
"today" : [["今天"], ["TODAY"]],
"pickTxt" : [["确定"], ["OK"]],//pickMode 精确到年、月时把今天变成“确定”
"close" : [["关闭"], ["CLOSE"]]
}

Calendar.prototype.draw = function() {
calendar = this;

var mvAry = [];

//mvAry[mvAry.length] = ' <form name="calendarForm" style="margin:
0px;">'; //因 <form> 不能嵌套， 2006-12-01 由寒羽枫改用 Div
mvAry[mvAry.length] = ' <div name="calendarForm" style="margin: 0px;">';
mvAry[mvAry.length] = '    <table width="100%" border="0" cellpadding="0" cellspacing="1" style="font-size:12px;">';
mvAry[mvAry.length] = '      <tr>';

mvAry[mvAry.length] = '        <th align="left"
width="1%"><input style="border: 1px solid ' +
calendar.colors["input_border"] + ';background-color:' +
calendar.colors["input_bg"] + ';width:16px;height:20px;';
if(calendar.DateMode > pickMode["month"]){mvAry[mvAry.length] = 'display:none;';}//pickMode 精确到年时隐藏“月”
mvAry[mvAry.length] ='" name="prevMonth" type="button" id="prevMonth" value="<" /></th>';

mvAry[mvAry.length] = '        <th align="center" width="98%"
nowrap="nowrap"><select name="calendarYear" id="calendarYear"
style="font-size:12px;"></select><select
name="calendarMonth" id="calendarMonth" style="font-size:12px;';
if(calendar.DateMode > pickMode["month"]){mvAry[mvAry.length] = 'display:none;';}//pickMode 精确到年时隐藏“月”
mvAry[mvAry.length] = '"></select></th>';

mvAry[mvAry.length] = '        <th align="right"
width="1%"><input style="border: 1px solid ' +
calendar.colors["input_border"] + ';background-color:' +
calendar.colors["input_bg"] + ';width:16px;height:20px;';
if(calendar.DateMode > pickMode["month"]){mvAry[mvAry.length] = 'display:none;';}//pickMode 精确到年时隐藏“月”
mvAry[mvAry.length] ='" name="nextMonth" type="button" id="nextMonth" value=">" /></th>';
mvAry[mvAry.length] = '      </tr>';
mvAry[mvAry.length] = '    </table>';

mvAry[mvAry.length] = '    <table id="calendarTable" width="100%"
style="border:0px solid
#CCCCCC;background-color:#FFFFFF;font-size:12px;';
if(calendar.DateMode >= pickMode["month"]){mvAry[mvAry.length] = 'display:none;';}//pickMode 精确到年、月时隐藏“天”
mvAry[mvAry.length] = '" border="0" cellpadding="3" cellspacing="1">';
mvAry[mvAry.length] = '      <tr>';
for(var i = 0; i < 7; i++) {

mvAry[mvAry.length] = '      <th
style="font-weight:normal;background-color:' + calendar.colors["tr_bg"] +
';color:' + calendar.colors["tr_word"] + ';">' +
Calendar.language["weeks"][this.lang][i] + '</th>';
}
mvAry[mvAry.length] = '      </tr>';
for(var i = 0; i < 6;i++){
    mvAry[mvAry.length] = '    <tr align="center">';
    for(var j = 0; j < 7; j++) {
      if (j == 0){
        mvAry[mvAry.length] = ' <td style="cursor:default;color:' + calendar.colors["sun_word"] + ';"></td>';
      } else if(j == 6) {
        mvAry[mvAry.length] = ' <td style="cursor:default;color:' + calendar.colors["sat_word"] + ';"></td>';
      } else {
        mvAry[mvAry.length] = ' <td style="cursor:default;"></td>';
      }
    }
    mvAry[mvAry.length] = '    </tr>';
}

//2009-03-03 添加的代码，放置时间的行
mvAry[mvAry.length] = '      <tr style="';
    if(calendar.DateMode >= pickMode["day"]){mvAry[mvAry.length] = 'display:none;';}//pickMode 精确到时日隐藏“时间”
    mvAry[mvAry.length] = '"><td align="center" colspan="7">';

mvAry[mvAry.length] = '      <select name="calendarHour"
id="calendarHour" style="font-size:12px;"></select>' +
Calendar.language["hour"][this.lang];
mvAry[mvAry.length] = '<span style="'
    if(calendar.DateMode >= pickMode["hour"]){mvAry[mvAry.length] = 'display:none;';}//pickMode 精确到小时时隐藏“分”

mvAry[mvAry.length] = '"><select name="calendarMinute"
id="calendarMinute" style="font-size:12px;"></select>' +
Calendar.language["minute"][this.lang]+'</span>';
    mvAry[mvAry.length] = '<span style="'
    if(calendar.DateMode >= pickMode["minute"]){mvAry[mvAry.length] = 'display:none;';}//pickMode 精确到小时、分时隐藏“秒”

mvAry[mvAry.length] = '"><select name="calendarSecond"
id="calendarSecond" style="font-size:12px;"></select>'+
Calendar.language["second"][this.lang]+'</span>';
mvAry[mvAry.length] = '      </td></tr>';

mvAry[mvAry.length] = '    </table>';
//mvAry[mvAry.length] = ' </from>';

mvAry[mvAry.length] = '      <div align="center" style="padding:4px
4px 4px 4px;background-color:' + calendar.colors["input_bg"] +
';">';
mvAry[mvAry.length] = '        <input
name="calendarClear" type="button" id="calendarClear" value="' +
Calendar.language["clear"][this.lang] + '" style="border: 1px solid ' +
calendar.colors["input_border"] + ';background-color:' +
calendar.colors["input_bg"] +
';width:40px;height:20px;font-size:12px;cursor:pointer;"/>';
mvAry[mvAry.length] = '        <input name="calendarToday" type="button" id="calendarToday" value="'

mvAry[mvAry.length] = (calendar.DateMode == pickMode["day"]) ?
Calendar.language["today"][this.lang] :
Calendar.language["pickTxt"][this.lang];
mvAry[mvAry.length] =
'" style="border: 1px solid ' + calendar.colors["input_border"] +
';background-color:' + calendar.colors["input_bg"] +
';width:60px;height:20px;font-size:12px;cursor:pointer"/>';

mvAry[mvAry.length] = '        <input name="calendarClose"
type="button" id="calendarClose" value="' +
Calendar.language["close"][this.lang] + '" style="border: 1px solid ' +
calendar.colors["input_border"] + ';background-color:' +
calendar.colors["input_bg"] +
';width:40px;height:20px;font-size:12px;cursor:pointer"/>';
mvAry[mvAry.length] = '      </div>';

mvAry[mvAry.length] = ' </div>';
this.panel.innerHTML = mvAry.join("");

/**//**//**//******** 以下代码由寒羽枫 2006-12-01 添加 **********/
var obj = this.getElementById("prevMonth");
obj.onclick = function () {calendar.goPrevMonth(calendar);}
obj.onblur = function () {calendar.onblur();}
this.prevMonth= obj;

obj = this.getElementById("nextMonth");
obj.onclick = function () {calendar.goNextMonth(calendar);}
obj.onblur = function () {calendar.onblur();}
this.nextMonth= obj;

obj = this.getElementById("calendarClear");
obj.onclick = function ()
{ calendar.ReturnDate(""); /*calendar.dateControl.value = "";calendar.hide();*///2007-09-14 由寒羽枫注释
}
this.calendarClear = obj;

obj = this.getElementById("calendarClose");
obj.onclick = function () {calendar.hide();}
this.calendarClose = obj;

obj = this.getElementById("calendarYear");
obj.onchange = function () {calendar.update(calendar);}
obj.onblur = function () {calendar.onblur();}
this.calendarYear = obj;

obj = this.getElementById("calendarMonth");
with(obj)
{
    onchange = function () {calendar.update(calendar);}
    onblur = function () {calendar.onblur();}
}this.calendarMonth = obj;

obj = this.getElementById("calendarHour");
obj.onchange = function () {calendar.hour = this.options[this.selectedIndex].value;}
obj.onblur = function () {calendar.onblur();}
this.calendarHour = obj;

obj = this.getElementById("calendarMinute");
obj.onchange = function () {calendar.minute = this.options[this.selectedIndex].value;}
obj.onblur = function () {calendar.onblur();}
this.calendarMinute = obj;

obj = this.getElementById("calendarSecond");
obj.onchange = function () {calendar.second = this.options[this.selectedIndex].value;}
obj.onblur = function () {calendar.onblur();}
this.calendarSecond = obj;

obj = this.getElementById("calendarToday");
obj.onclick = function () {
var today = (calendar.DateMode != pickMode["day"]) ?
                    new Date(calendar.year,calendar.month,calendar.day,calendar.hour,calendar.minute,calendar.second)
                    : new Date();//2008-01-29
    calendar.ReturnDate(today.format(calendar.dateFormatStyle));
}
this.calendarToday = obj;
}

//年份下拉框绑定数据
Calendar.prototype.bindYear = function() {
var cy = this.calendarYear;//2006-12-01 由寒羽枫修改
cy.length = 0;
for (var i = this.beginYear; i <= this.endYear; i++){
    cy.options[cy.length] = new Option(i + Calendar.language["year"][this.lang], i);
}
}

//月份下拉框绑定数据
Calendar.prototype.bindMonth = function() {
var cm = this.calendarMonth;//2006-12-01 由寒羽枫修改
cm.length = 0;
for (var i = 0; i < 12; i++){
    cm.options[cm.length] = new Option(Calendar.language["months"][this.lang][i], i);
}
}

//小时下拉框绑定数据
Calendar.prototype.bindHour = function() {
var ch = this.calendarHour;
if(ch.length > 0){return;}//2009-03-03 不需要重新绑定，提高性能
//ch.length = 0;
var h;
for (var i = 0; i < 24; i++){
    h = ("00" + i +"").substr(("" + i).length);
    ch.options[ch.length] = new Option(h, h);
}
}

//分钟下拉框绑定数据
Calendar.prototype.bindMinute = function() {
var cM = this.calendarMinute;
if(cM.length > 0){return;}//2009-03-03 不需要重新绑定，提高性能
//cM.length = 0;
var M;
for (var i = 0; i < 60; i++){
    M = ("00" + i +"").substr(("" + i).length);
    cM.options[cM.length] = new Option(M, M);
}
}

//秒钟下拉框绑定数据
Calendar.prototype.bindSecond = function() {
var cs = this.calendarSecond;
if(cs.length > 0){return;}//2009-03-03 不需要重新绑定，提高性能
//cs.length = 0;
var s;
for (var i = 0; i < 60; i++){
    s = ("00" + i +"").substr(("" + i).length);
    cs.options[cs.length] = new Option(s, s);
}
}

//向前一月
Calendar.prototype.goPrevMonth = function(e){
if (this.year == this.beginYear && this.month == 0){return;}
this.month--;
if (this.month == -1) {
    this.year--;
    this.month = 11;
}
this.date = new Date(this.year, this.month, 1);
this.changeSelect();
this.bindData();
}

//向后一月
Calendar.prototype.goNextMonth = function(e){
if (this.year == this.endYear && this.month == 11){return;}
this.month++;
if (this.month == 12) {
    this.year++;
    this.month = 0;
}
this.date = new Date(this.year, this.month, 1);
this.changeSelect();
this.bindData();
}

//改变SELECT选中状态
Calendar.prototype.changeSelect = function() {
var cy = this.calendarYear;//2006-12-01 由寒羽枫修改
var cm = this.calendarMonth;
var ch = this.calendarHour;
var cM = this.calendarMinute;
var cs = this.calendarSecond;
//2006-12-30 由民工.砖家修改，减少运算次数
cy[this.date.getFullYear()-this.beginYear].selected = true;
cm[this.date.getMonth()].selected =true;

//2009-03-03 添加，初始化时间的值
ch[this.hour].selected =true;
cM[this.minute].selected =true;
cs[this.second].selected =true;
}

//更新年、月
Calendar.prototype.update = function (e){
this.year = e.calendarYear.options[e.calendarYear.selectedIndex].value;//2006-12-01 由寒羽枫修改
this.month = e.calendarMonth.options[e.calendarMonth.selectedIndex].value;
this.date = new Date(this.year, this.month, 1);
//this.changeSelect();
this.bindData();
}

//绑定数据到月视图
Calendar.prototype.bindData = function () {
var calendar = this;
    if(calendar.DateMode >= pickMode["month"]){return;}//2008-01-29
// var dateArray = this.getMonthViewArray(this.date.getYear(), this.date.getMonth());
//2006-12-30 由民工.砖家修改在Firefox 下年份错误
var dateArray = this.getMonthViewArray(this.date.getFullYear(), this.date.getMonth());
var tds = this.getElementById("calendarTable").getElementsByTagName("td");
for(var i = 0; i < tds.length; i++) {
tds[i].style.backgroundColor = calendar.colors["td_bg_out"];
    tds[i].onclick = function () {return;}
    tds[i].onmouseover = function () {return;}
    tds[i].onmouseout = function () {return;}
    if (i > dateArray.length - 1) break;
    tds[i].innerHTML = dateArray[i];
    if (dateArray[i] != " "){
      tds[i].bgColorTxt = "td_bg_out"; //2009-03-03 保存背景色的class
        var cur = new Date();
        tds[i].isToday = false;

if (cur.getFullYear() == calendar.date.getFullYear() &&
cur.getMonth() == calendar.date.getMonth() && cur.getDate() ==
dateArray[i]) {
      //是今天的单元格
        tds[i].style.backgroundColor = calendar.colors["cur_bg"];
        tds[i].bgColorTxt = "cur_bg";
        tds[i].isToday = true;
        }
    if(calendar.dateControl != null )
    {
      cur = calendar.dateControl.value.toDate(calendar.dateFormatStyle);

if (cur.getFullYear() == calendar.date.getFullYear() &&
cur.getMonth() == calendar.date.getMonth()&& cur.getDate() ==
dateArray[i]) {
      //是已被选中的单元格
        calendar.selectedDayTD = tds[i];
        tds[i].style.backgroundColor = calendar.colors["sel_bg"];
        tds[i].bgColorTxt = "sel_bg";
      }
    }
      tds[i].onclick = function () {
            if(calendar.DateMode == pickMode["day"]) //2009-03-03 当选择日期时，点击格子即返回值
            {
                calendar.ReturnDate(new Date(calendar.date.getFullYear(),
                                                    calendar.date.getMonth(),
                                                    this.innerHTML).format(calendar.dateFormatStyle));
            }
            else
            {
                if(calendar.selectedDayTD != null) //2009-03-03 清除已选中的背景色
                {

calendar.selectedDayTD.style.backgroundColor
=(calendar.selectedDayTD.isToday)? calendar.colors["cur_bg"] :
calendar.colors["td_bg_out"];
                }
                this.style.backgroundColor = calendar.colors["sel_bg"];
                calendar.day = this.innerHTML;
                calendar.selectedDayTD = this; //2009-03-03 记录已选中的日子
            }
          }
      tds[i].style.cursor ="pointer"; //2007-08-06 由寒羽枫添加，鼠标变成手指状
      tds[i].onmouseover = function () {
        this.style.backgroundColor = calendar.colors["td_bg_over"];
      }
      tds[i].onmouseout = function () {
        if(calendar.selectedDayTD != this) {
        this.style.backgroundColor = calendar.colors[this.bgColorTxt];}
      }
      tds[i].onblur = function () {calendar.onblur();}
    }
}
}

//根据年、月得到月视图数据(数组形式)
Calendar.prototype.getMonthViewArray = function (y, m) {
var mvArray = [];
var dayOfFirstDay = new Date(y, m, 1).getDay();
var daysOfMonth = new Date(y, m + 1, 0).getDate();
for (var i = 0; i < 42; i++) {
    mvArray[i] = " ";
}
for (var i = 0; i < daysOfMonth; i++){
    mvArray[i + dayOfFirstDay] = i + 1;
}
return mvArray;
}

//扩展 document.getElementById(id) 多浏览器兼容性 from meizz tree source
Calendar.prototype.getElementById = function(id){
if (typeof(id) != "string" || id == "") return null;
if (document.getElementById) return document.getElementById(id);
if (document.all) return document.all(id);
try {return eval(id);} catch(e){ return null;}
}

//扩展 object.getElementsByTagName(tagName)
Calendar.prototype.getElementsByTagName = function(object, tagName){
if (document.getElementsByTagName) return document.getElementsByTagName(tagName);
if (document.all) return document.all.tags(tagName);
}

//取得HTML控件绝对位置
Calendar.prototype.getAbsPoint = function (e){
var x = e.offsetLeft;
var y = e.offsetTop;
while(e = e.offsetParent){
    x += e.offsetLeft;
    y += e.offsetTop;
}
return {"x": x, "y": y};
}

//显示日历
Calendar.prototype.show = function (dateObj, popControl) {
if (dateObj == null){
    throw new Error("arguments[0] is necessary")
}
this.dateControl = dateObj;
var now = new Date();

this.date = (dateObj.value.length > 0) ? new
Date(dateObj.value.toDate(this.dateFormatStyle)) :
now.format(this.dateFormatStyle).toDate(this.dateFormatStyle)
;//2008-01-29 寒羽枫添加 → 若为空则根据dateFormatStyle初始化日期

if(this.panel.innerHTML==""||cal.dateFormatStyleOld !=
cal.dateFormatStyle)//2008-01-29 把构造表格放在此处，2009-03-03 若请示的样式改变，则重新初始化
{
    this.draw();
    this.bindYear();
    this.bindMonth();
    this.bindHour();
    this.bindMinute();
    this.bindSecond();
}
this.year = this.date.getFullYear();
this.month = this.date.getMonth();
this.day = this.date.getDate();
this.hour = this.date.getHours();
this.minute = this.date.getMinutes();
this.second = this.date.getSeconds();
this.changeSelect();
this.bindData();

if (popControl == null){
    popControl = dateObj;
}
var xy = this.getAbsPoint(popControl);
//this.panel.style.left = xy.x + "px";
//this.panel.style.top = (xy.y + dateObj.offsetHeight) + "px";
this.panel.style.left = (xy.x + leftX)+ "px"; //由寒羽枫 2007-02-11 修改 → 加入自定义偏移量
this.panel.style.top = (xy.y + topY + dateObj.offsetHeight) + "px";

//由寒羽枫 2006-06-25 修改 → 把 visibility 变为 display，并添加失去焦点的事件 //this.setDisplayStyle("select", "hidden");
//this.panel.style.visibility = "visible";
//this.container.style.visibility = "visible";
this.panel.style.display = "";
this.container.style.display = "";

if( !this.dateControl.isTransEvent)
{
    this.dateControl.isTransEvent = true;
    /* 已写在返回值的时候 ReturnDate 函数中，去除验证事件的函数
    this.dateControl.changeEvent = this.dateControl.onchange;//将 onchange 转成其它函数，以免触发验证事件
    this.dateControl.onchange = function()
    {if(typeof(this.changeEvent) =='function'){this.changeEvent();}}*/
    if(this.dateControl.onblur != null){
    this.dateControl.blurEvent = this.dateControl.onblur;}//2007-09-14 保存主文本框的 onblur ，使其原本的事件不被覆盖
    this.dateControl.onblur = function()
    {calendar.onblur();if(typeof(this.blurEvent) =='function'){this.blurEvent();}
    }
}

this.container.onmouseover = function(){isFocus=true;}
this.container.onmouseout = function(){isFocus=false;}
}

//隐藏日历
Calendar.prototype.hide = function() {
//this.setDisplayStyle("select", "visible");
//this.panel.style.visibility = "hidden";
//this.container.style.visibility = "hidden";
this.panel.style.display = "none";
this.container.style.display = "none";
isFocus=false;
}

//焦点转移时隐藏日历 → 由寒羽枫 2006-06-25 添加
Calendar.prototype.onblur = function() {
    if(!isFocus){this.hide();}
}

//以下由寒羽枫 2007-07-26 修改 → 确保日历容器节点在 body 最后，否则 FireFox 中不能出现在最上方
function InitContainerPanel() //初始化容器
{

var str = '<div id="calendarPanel" style="position:
absolute;display: none;z-index:9999; background-color: #FFFFFF;border:
1px solid #CCCCCC;width:175px;font-size:12px;"></div>';
    if(document.all)
    {
        str += '<iframe style="position:absolute;z-index:2000;width:expression(this.previousSibling.offsetWidth);';
        str += 'height:expression(this.previousSibling.offsetHeight);';
        str += 'left:expression(this.previousSibling.offsetLeft);top:expression(this.previousSibling.offsetTop);';
        str += 'display:expression(this.previousSibling.style.display);" scrolling="no" frameborder="no"></iframe>';
    }
    var div = document.createElement("div");
    div.innerHTML = str;
    div.id = "ContainerPanel";
    div.style.display ="none";
    document.body.appendChild(div);
}//调用calendar.show(dateControl, popControl);
//-->

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/cityhunter172/archive/2009/03/04/3957836.aspx

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1">
<script src="WebCalendar.js" type="text/javascript"></script>
</head>
<body>
<form name="form1" method="post" action="WebForm1.aspx" id="form1">
<input
type="text" value="" maxlength="100" id="Txt_CreateDateST01"
onclick="SelectDate(this,'yyyy 年')" readonly="true"
style="width:265px;cursor:pointer" /><br />
<input
type="text" value="" maxlength="100" id="Txt_CreateDateST02"
onclick="SelectDate(this,'yyyy 年 MM 月')" readonly="true"
style="width:265px;cursor:pointer" /><br />
<input
type="text" value="" maxlength="100" id="Txt_CreateDateST03"
onclick="SelectDate(this,'yyyy\/MM\/dd')" readonly="true"
style="width:265px;cursor:pointer" /><br />
<input
type="text" value="" maxlength="100" id="Text1"
onclick="SelectDate(this,'yyyy-MM-dd hh时')" readonly="true"
style="width:265px;cursor:pointer" /><br />
<input
type="text" value="" maxlength="100" id="Text3"
onclick="SelectDate(this,'yyyy-MM-dd hh:mm')" readonly="true"
style="width:265px;cursor:pointer" /><br />
<input
type="text" value="" maxlength="100" id="Text4"
onclick="SelectDate(this,'yyyy年MM月dd日 hh时mm分ss秒',0,-150)"
readonly="true" style="width:265px;cursor:pointer" /><br />
</form>
</body>
</html>

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