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/** keyboard navigation, only for popup calendars */
Calendar._keyEvent = function(ev) {
if (!window.calendar) {
   return false;
}
(Calendar.is_ie) && (ev = window.event);
var cal = window.calendar;
var act = (Calendar.is_ie || ev.type == "keypress");
if (ev.ctrlKey) {
   switch (ev.keyCode) {
       case 37: // KEY left
    act && Calendar.cellClick(cal._nav_pm);
    break;
       case 38: // KEY up
    act && Calendar.cellClick(cal._nav_py);
    break;
       case 39: // KEY right
    act && Calendar.cellClick(cal._nav_nm);
    break;
       case 40: // KEY down
    act && Calendar.cellClick(cal._nav_ny);
    break;
       default:
    return false;
   }
} else switch (ev.keyCode) {
      case 32: // KEY space (now)
   Calendar.cellClick(cal._nav_now);
   break;
      case 27: // KEY esc
   act && cal.hide();
   break;
      case 37: // KEY left
      case 38: // KEY up
      case 39: // KEY right
      case 40: // KEY down
   if (act) {
    var date = cal.date.getDate() - 1;
    var el = cal.currentDateEl;
    var ne = null;
    var prev = (ev.keyCode == 37) || (ev.keyCode == 38);
    switch (ev.keyCode) {
        case 37: // KEY left
     (--date >= 0) && (ne = cal.ar_days[date]);
     break;
        case 38: // KEY up
     date -= 7;
     (date >= 0) && (ne = cal.ar_days[date]);
     break;
        case 39: // KEY right
     (++date < cal.ar_days.length) && (ne = cal.ar_days[date]);
     break;
        case 40: // KEY down
     date += 7;
     (date < cal.ar_days.length) && (ne = cal.ar_days[date]);
     break;
    }
    if (!ne) {
     if (prev) {
      Calendar.cellClick(cal._nav_pm);
     } else {
      Calendar.cellClick(cal._nav_nm);
     }
     date = (prev) ? cal.date.getMonthDays() : 1;
     el = cal.currentDateEl;
     ne = cal.ar_days[date - 1];
    }
    Calendar.removeClass(el, "selected");
    Calendar.addClass(ne, "selected");
    cal.date.setDate(ne.caldate);
    cal.currentDateEl = ne;
   }
   break;
      case 13: // KEY enter
   if (act) {
    cal.callHandler();
    cal.hide();
   }
   break;
      default:
   return false;
}
Calendar.stopEvent(ev);
};

/**
*   (RE)Initializes the calendar to the given date and style (if mondayFirst is
*   true it makes Monday the first day of week, otherwise the weeks start on
*   Sunday.
*/
Calendar.prototype._init = function (mondayFirst, date) {
var today = new Date();
var year = date.getFullYear();
if (year < this.minYear) {
   year = this.minYear;
   date.setFullYear(year);
} else if (year > this.maxYear) {
   year = this.maxYear;
   date.setFullYear(year);
}
this.mondayFirst = mondayFirst;
this.date = new Date(date);
var month = date.getMonth();
var mday = date.getDate();
var no_days = date.getMonthDays();
date.setDate(1);
var wday = date.getDay();
var MON = mondayFirst ? 1 : 0;
var SAT = mondayFirst ? 5 : 6;
var SUN = mondayFirst ? 6 : 0;
if (mondayFirst) {
   wday = (wday > 0) ? (wday - 1) : 6;
}
var iday = 1;
var row = this.tbody.firstChild;
var MN = Calendar._MN3[month];
var hasToday = ((today.getFullYear() == year) && (today.getMonth() == month));
var todayDate = today.getDate();
var week_number = date.getWeekNumber();
var ar_days = new Array();
for (var i = 0; i < 6; ++i) {
   if (iday > no_days) {
    row.className = "emptyrow";
    row = row.nextSibling;
    continue;
   }
   var cell = row.firstChild;
   if (this.weekNumbers) {
    cell.className = "day wn";
    cell.firstChild.data = week_number;
    cell = cell.nextSibling;
   }
   ++week_number;
   row.className = "daysrow";
   for (var j = 0; j < 7; ++j) {
    cell.className = "day";
    if ((!i && j < wday) || iday > no_days) {
     // cell.className = "emptycell";
     cell.innerHTML = " ";
     cell.disabled = true;
     cell = cell.nextSibling;
     continue;
    }
    cell.disabled = false;
    cell.firstChild.data = iday;
    if (typeof this.checkDisabled == "function") {
     date.setDate(iday);
     if (this.checkDisabled(date)) {
      cell.className += " disabled";
      cell.disabled = true;
     }
    }
    if (!cell.disabled) {
     ar_days[ar_days.length] = cell;
     cell.caldate = iday;
     cell.ttip = "_";
     if (iday == mday) {
      cell.className += " selected";
      this.currentDateEl = cell;
     }
     if (hasToday && (iday == todayDate)) {
      cell.className += " today";
      cell.ttip += Calendar._TT["PART_TODAY"];
     }
     if (wday == SAT || wday == SUN) {
      cell.className += " weekend";
     }
    }
    ++iday;
    ((++wday) ^ 7) || (wday = 0);
    cell = cell.nextSibling;
   }
   row = row.nextSibling;
}
this.ar_days = ar_days;
this.title.firstChild.data = Calendar._MN[month] + ", " + year;
// PROFILE
// this.tooltips.firstChild.data = "Generated in " + ((new Date()) - today) + " ms";
};

/**
*   Calls _init function above for going to a certain date (but only if the
*   date is different than the currently selected one).
*/
Calendar.prototype.setDate = function (date) {
if (!date.equalsTo(this.date)) {
   this._init(this.mondayFirst, date);
}
};

/** Modifies the "mondayFirst" parameter (EU/US style). */
Calendar.prototype.setMondayFirst = function (mondayFirst) {
this._init(mondayFirst, this.date);
this._displayWeekdays();
};

/**
*   Allows customization of what dates are enabled.   The "unaryFunction"
*   parameter must be a function object that receives the date (as a JS Date
*   object) and returns a boolean value.   If the returned value is true then
*   the passed date will be marked as disabled.
*/
Calendar.prototype.setDisabledHandler = function (unaryFunction) {
this.checkDisabled = unaryFunction;
};

/** Customization of allowed year range for the calendar. */
Calendar.prototype.setRange = function (a, z) {
this.minYear = a;
this.maxYear = z;
};

/** Calls the first user handler (selectedHandler). */
Calendar.prototype.callHandler = function () {
if (this.onSelected) {
this.onSelected(this, this.date.print(this.dateFormat));
}
};

/** Calls the second user handler (closeHandler). */
Calendar.prototype.callCloseHandler = function () {
if (this.onClose) {
this.onClose(this);
}
this.hideShowCovered();
};

/** Removes the calendar object from the DOM tree and destroys it. */
Calendar.prototype.destroy = function () {
var el = this.element.parentNode;
el.removeChild(this.element);
Calendar._C = null;
delete el;
};

/**
* Moves the calendar element to a different section in the DOM tree (changes
* its parent).
*/
Calendar.prototype.reparent = function (new_parent) {
var el = this.element;
el.parentNode.removeChild(el);
new_parent.appendChild(el);
};

// This gets called when the user presses a mouse button anywhere in the
// document, if the calendar is shown.   If the click was outside the open
// calendar this function closes it.
Calendar._checkCalendar = function(ev) {
if (!window.calendar) {
   return false;
}
var el = Calendar.is_ie ? Calendar.getElement(ev) : Calendar.getTargetElement(ev);
for (; el != null && el != calendar.element; el = el.parentNode);
if (el == null) {
   // calls closeHandler which should hide the calendar.
   window.calendar.callCloseHandler();
   Calendar.stopEvent(ev);
}
};

/** Shows the calendar. */
Calendar.prototype.show = function () {
var rows = this.table.getElementsByTagName("tr");
for (var i = rows.length; i > 0;) {
   var row = rows[--i];
   Calendar.removeClass(row, "rowhilite");
   var cells = row.getElementsByTagName("td");
   for (var j = cells.length; j > 0;) {
    var cell = cells[--j];
    Calendar.removeClass(cell, "hilite");
    Calendar.removeClass(cell, "active");
   }
}
this.element.style.display = "block";
this.hidden = false;
if (this.isPopup) {
   window.calendar = this;
   Calendar.addEvent(document, "keydown", Calendar._keyEvent);
   Calendar.addEvent(document, "keypress", Calendar._keyEvent);
   Calendar.addEvent(document, "mousedown", Calendar._checkCalendar);
}
this.showMonthsCombo();
this.hideShowCovered();
};

/**
*   Hides the calendar.   Also removes any "hilite" from the class of any TD
*   element.
*/
Calendar.prototype.hide = function () {
if (this.isPopup) {
   Calendar.removeEvent(document, "keydown", Calendar._keyEvent);
   Calendar.removeEvent(document, "keypress", Calendar._keyEvent);
   Calendar.removeEvent(document, "mousedown", Calendar._checkCalendar);
}
this.element.style.display = "none";
this.hidden = true;
this.hideShowCovered();
};

/**
*   Shows the calendar at a given absolute position (beware that, depending on
*   the calendar element style -- position property -- this might be relative
*   to the parent's containing rectangle).
*/
Calendar.prototype.showAt = function (x, y) {
var s = this.element.style;
s.left = x + "px";
s.top = y + "px";
this.show();
};

/** Shows the calendar near a given element. */
Calendar.prototype.showAtElement = function (el,moveX) {
var p = Calendar.getAbsolutePos(el);
if(moveX ==null)
   this.showAt(p.x, p.y + el.offsetHeight);
else
   this.showAt(p.x - moveX, p.y + el.offsetHeight);
};
Calendar.prototype.showAtElementXY = function (el,moveX,moveY) {
var p = Calendar.getAbsolutePos(el);
if(moveX ==null)
   this.showAt(p.x, p.y + el.offsetHeight);
else
   this.showAt(p.x - moveX, p.y + el.offsetHeight - moveY);
};

/** Customizes the date format. */
Calendar.prototype.setDateFormat = function (str) {
this.dateFormat = str;
};

/** Customizes the tooltip date format. */
Calendar.prototype.setTtDateFormat = function (str) {
this.ttDateFormat = str;
};

/**
*   Tries to identify the date represented in a string.   If successful it also
*   calls this.setDate which moves the calendar to the given date.
*/
Calendar.prototype.parseDate = function (str, fmt) {
var y = 0;
var m = -1;
var d = 0;
var a = str.split(/\W+/);
if (!fmt) {
   fmt = this.dateFormat;
}
var b = fmt.split(/\W+/);
var i = 0, j = 0;
for (i = 0; i < a.length; ++i) {
   if (b[i] == "D" || b[i] == "DD") {
    continue;
   }
   if (b[i] == "d" || b[i] == "dd") {
    d = parseInt(a[i]);
   }
   if (b[i] == "m" || b[i] == "mm") {
    m = parseInt(a[i]) - 1;
   }
   if (b[i] == "y") {
    y = parseInt(a[i]);
   }
   if (b[i] == "yy") {
    y = parseInt(a[i]) + 1900;
   }
   if (b[i] == "M" || b[i] == "MM") {
    for (j = 0; j < 12; ++j) {
     if (Calendar._MN[j].substr(0, a[i].length).toLowerCase() == a[i].toLowerCase()) { m = j; break; }
    }
   }
}
if (y != 0 && m != -1 && d != 0) {
   this.setDate(new Date(y, m, d));
   return;
}
y = 0; m = -1; d = 0;
for (i = 0; i < a.length; ++i) {
   if (a[i].search(/[a-zA-Z]+/) != -1) {
    var t = -1;
    for (j = 0; j < 12; ++j) {
     if (Calendar._MN[j].substr(0, a[i].length).toLowerCase() == a[i].toLowerCase()) { t = j; break; }
    }
    if (t != -1) {
     if (m != -1) {
      d = m+1;
     }
     m = t;
    }
   } else if (parseInt(a[i]) <= 12 && m == -1) {
    m = a[i]-1;
   } else if (parseInt(a[i]) > 31 && y == 0) {
    y = a[i];
   } else if (d == 0) {
    d = a[i];
   }
}
if (y == 0) {
   var today = new Date();
   y = today.getFullYear();
}
if (m != -1 && d != 0) {
   this.setDate(new Date(y, m, d));
}
else
{
   this.setDate(new Date());
}
};

Calendar.prototype.hideShowCovered = function ()
{
var tags = new Array("applet", "iframe", "select");
var el = this.element;

var p = Calendar.getAbsolutePos(el);
var EX1 = p.x;
var EX2 = el.offsetWidth + EX1;
var EY1 = p.y;
var EY2 = el.offsetHeight + EY1;

for (var k = tags.length; k > 0; ) {
var ar = document.getElementsByTagName(tags[--k]);
var cc = null;

for (var i = ar.length; i > 0;) {
cc = ar[--i];

    p = Calendar.getAbsolutePos(cc);
    var CX1 = p.x;
    var CX2 = cc.offsetWidth + CX1;
    var CY1 = p.y;
    var CY2 = cc.offsetHeight + CY1;

    if (this.hidden || (CX1 > EX2) || (CX2 < EX1) || (CY1 > EY2) || (CY2 < EY1)) {
     cc.style.visibility = "visible";
    } else {
     cc.style.visibility = "hidden";
    }
   }
}
};

/** 显示星期工具栏 */
Calendar.prototype._displayWeekdays = function ()
{
var MON = this.mondayFirst ? 0 : 1;
var SUN = this.mondayFirst ? 6 : 0;
var SAT = this.mondayFirst ? 5 : 6;
var cell = this.firstdayname;
for (var i = 0; i < 7; ++i) {
   cell.className = "day name";
   if (!i) {
    cell.ttip = this.mondayFirst ? Calendar._TT["SUN_FIRST"] : Calendar._TT["MON_FIRST"];
    cell.navtype = 100;
    cell.calendar = this;
    Calendar._add_evs(cell);
   }
   if (i == SUN || i == SAT) {
    Calendar.addClass(cell, "weekend");
   }
   cell.firstChild.data = Calendar._DN3[i + 1 - MON];
   cell = cell.nextSibling;
}
};

/** 隐藏全部不必显示的 combo */
Calendar.prototype._hideCombos = function ()
{
this.monthsCombo.style.display = "none";
this.yearsCombo.style.display = "none";
};

/** 拖曳开始动作 */
Calendar.prototype._dragStart = function (ev)
{
if (this.dragging) {
   return;
}
this.dragging = true;
var posX;
var posY;
if (Calendar.is_ie) {
   posY = window.event.clientY + document.body.scrollTop;
   posX = window.event.clientX + document.body.scrollLeft;
} else {
   posY = ev.clientY + window.scrollY;
   posX = ev.clientX + window.scrollX;
}
var st = this.element.style;
this.xOffs = posX - parseInt(st.left);
this.yOffs = posY - parseInt(st.top);
with (Calendar) {
   addEvent(document, "mousemove", calDragIt);
   addEvent(document, "mouseover", stopEvent);
   addEvent(document, "mouseup", calDragEnd);
}
};

// BEGIN: DATE OBJECT PATCHES

/** 12个中的天数 */
Date._MD = new Array(31,28,31,30,31,30,31,31,30,31,30,31);

/** 时间常量 */
Date.SECOND = 1000;
Date.MINUTE = 60 * Date.SECOND;
Date.HOUR    = 60 * Date.MINUTE;
Date.DAY     = 24 * Date.HOUR;
Date.WEEK    =   7 * Date.DAY;

/** 得到当前月的天数 */
Date.prototype.getMonthDays = function(month)
{
var year = this.getFullYear();
if (typeof month == "undefined") {
   month = this.getMonth();
}
if (((0 == (year%4)) && ( (0 != (year%100)) || (0 == (year%400)))) && month == 1) {
   return 29;
} else {
   return Date._MD[month];
}
};

/** 得到星期几 */
Date.prototype.getWeekNumber = function()
{
var now = new Date(this.getFullYear(), this.getMonth(), this.getDate(), 0, 0, 0);
var then = new Date(this.getFullYear(), 0, 1, 0, 0, 0);
var time = now - then;
var day = then.getDay();
(day > 3) && (day -= 4) || (day += 3);
return Math.round(((time / Date.DAY) + day) / 7);
};

/** 检查日期是否相等 */
Date.prototype.equalsTo = function(date)
{
return ((this.getFullYear() == date.getFullYear()) &&(this.getMonth() == date.getMonth()) &&(this.getDate() == date.getDate()));
};

/** 按给定的日期格式输出 */
Date.prototype.print = function (frm)
{
var str = new String(frm);
var m = this.getMonth();
var d = this.getDate();
var y = this.getFullYear();
var wn = this.getWeekNumber();
var w = this.getDay();
var s = new Array();
s["d"] = d;
s["dd"] = (d < 10) ? ("0" + d) : d;
s["m"] = 1+m;
s["mm"] = (m < 9) ? ("0" + (1+m)) : (1+m);
s["y"] = y;
s["yy"] = new String(y).substr(2, 2);
s["w"] = wn;
s["ww"] = (wn < 10) ? ("0" + wn) : wn;
with (Calendar) {
   s["D"] = _DN3[w];
   s["DD"] = _DN[w];
   s["M"] = _MN3[m];
   s["MM"] = _MN[m];
}
var re = /(.*)(\W|^)(d|dd|m|mm|y|yy|MM|M|DD|D|w|ww)(\W|$)(.*)/;
while (re.exec(str) != null) {
   str = RegExp.$1 + RegExp.$2 + s[RegExp.$3] + RegExp.$4 + RegExp.$5;
}
return str;
};

// END: DATE OBJECT PATCHES

// 全局对象
window.calendar = null;

// 以下本地化中文
Calendar._DN = new Array("周日", "一", "二", "三", "四", "五", "六", "日");
Calendar._MN = new Array("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");

// 操作提示
Calendar._TT = {};
Calendar._TT["TOGGLE"] = "切换周首日";
Calendar._TT["PREV_YEAR"] = "选择上一年。按住菜单,下拉选择年份";
Calendar._TT["PREV_MONTH"] = "选择上一月。按住菜单,下拉选择月份";
Calendar._TT["GO_TODAY"] = "选择本日";
Calendar._TT["NEXT_MONTH"] = "选择下一月。按住菜单,下拉选择月份";
Calendar._TT["NEXT_YEAR"] = "选择下一年。按住菜单,下拉选择年份";
Calendar._TT["SEL_DATE"] = "选择日期";
Calendar._TT["DRAG_TO_MOVE"] = "拖曳";
Calendar._TT["PART_TODAY"] = " (本日)";
Calendar._TT["MON_FIRST"] = "以周一作为第一天";
Calendar._TT["SUN_FIRST"] = "以周日作为第一天";
Calendar._TT["CLOSE"] = "关闭";
Calendar._TT["TODAY"] = "选择本日";

// 日期格式
Calendar._TT["DEF_DATE_FORMAT"] = "y-mm-dd";
Calendar._TT["TT_DATE_FORMAT"] = "D, M d";

Calendar._TT["WK"] = "星期";
// 以上本地化中文

//以下全局调用函数
var calendar;
function selected(cal, date)
{
   cal.sel.value = date;
   if (cal.sel.id == "sel1" || cal.sel.id == "sel3")
     cal.callCloseHandler();
}

function closeHandler(cal)
{
cal.hide();
}

//使用方法：

//<script src='calendar.js'></script>

//<input type="text" name="applyStartDateStr" size="10" value="" onchange="IsDate(this,'N')" class="input">
//<a href="javascript:" onclick="return showCalendar('applyStartDateStr', 'y-mm-dd');"><img src="/images/calendar.gif" border="0" alt=""/></a>

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