一个很不错的日历显示(JS)

calendar.js 文件
// JavaScript Document

//当点击输入文本框时，就显示了日历层
<!--
//当前日期
//<input type="text" size="10" name="datBegin" value="<%=formatdatetime(dateandtime_start,2)%>" maxlength="10"  readonly  onclick="fPopCalendar(datBegin,datBegin);return false">日<%h_time(int(hour(dateandtime_start))),23,"datHourBegin"%>时<%h_time(int(minute(dateandtime_start))),59,"datMinuteBegin"%>分(日期格式:yyyy-mm-dd)
function getNowDate()
{
  var nn=new Date();
  year1=nn.getYear();
  mon1=nn.getMonth()+1;
  date1=nn.getDate();
  var monstr1;
  var datestr1
  if(mon1<10)
    monstr1="0"+mon1;
  else
    monstr1=""+mon1;
   
  if(date1<10)
    datestr1="0"+date1;
  else
    datestr1=""+date1;
  return year1+"-"+monstr1+"-"+datestr1;
}
//目标日期
function getlastweekDate()
{
  var nn=new Date();
  year1=nn.getYear();
  mon1=nn.getMonth()+1;
  date1=nn.getDate();
 
  var mm=new Date(year1,mon1-1,date1);
  var tmp1=new Date(2000,1,1);
  var tmp2=new Date(2000,1,15);
  var ne=tmp2-tmp1;
  var mm2=new Date();
  mm2.setTime(mm.getTime()-ne);
 
 
  year2=mm2.getYear();
  mon2=mm2.getMonth()+1;
  date2=mm2.getDate();
   
   
    if(mon2<10)
    monstr2="0"+mon2;
  else
    monstr2=""+mon2;
   
  if(date2<10)
    datestr2="0"+date2;
  else
    datestr2=""+date2;

 
    return year2+"-"+monstr2+"-"+datestr2;
}



var gdCtrl = new Object();
var goSelectTag = new Array();
var gcGray  = "#808080";
var gcToggle = "#FB8664";
var gcBG = "#e5e6ec";
var previousObject = null;

var gdCurDate = new Date();
var giYear = gdCurDate.getFullYear();
var giMonth = gdCurDate.getMonth()+1;
var giDay = gdCurDate.getDate();

function fSetDate(iYear, iMonth, iDay){
  VicPopCal.style.visibility = "hidden";
  if ((iYear == 0) && (iMonth == 0) && (iDay == 0)){
  gdCtrl.value = "";
  }else{
  iMonth = iMonth + 100 + "";
  iMonth = iMonth.substring(1);
  iDay  = iDay + 100 + "";
  iDay  = iDay.substring(1);
  if(gdCtrl.tagName == "INPUT"){
    gdCtrl.value = iYear+"-"+iMonth+"-"+iDay;
  }else{
    gdCtrl.innerText = iYear+"-"+iMonth+"-"+iDay;
  }
  }
 
  for (i in goSelectTag)
  goSelectTag[i].style.visibility = "visible";
  goSelectTag.length = 0;
 
  window.returnValue=gdCtrl.value;
  //window.close();

}

function HiddenDiv()
{
var i;
  VicPopCal.style.visibility = "hidden";
  for (i in goSelectTag)
  goSelectTag[i].style.visibility = "visible";
  goSelectTag.length = 0;

}
function fSetSelected(aCell){
  var iOffset = 0;
  var iYear = parseInt(tbSelYear.value);
  var iMonth = parseInt(tbSelMonth.value);
 
  aCell.bgColor = gcBG;
  with (aCell.children["cellText"]){
  var iDay = parseInt(innerText);
  if (color==gcGray)
iOffset = (Victor<10)?-1:1;
iMonth += iOffset;
if (iMonth<1) {
iYear--;
iMonth = 12;
}else if (iMonth>12){
iYear++;
iMonth = 1;
}
  }
  fSetDate(iYear, iMonth, iDay);
}

function Point(iX, iY){
this.x = iX;
this.y = iY;
}

function fBuildCal(iYear, iMonth) {
  var aMonth=new Array();
  for(i=1;i<7;i++)
  aMonth[i]=new Array(i);
 
  var dCalDate=new Date(iYear, iMonth-1, 1);
  var iDayOfFirst=dCalDate.getDay();
  var iDaysInMonth=new Date(iYear, iMonth, 0).getDate();
  var iOffsetLast=new Date(iYear, iMonth-1, 0).getDate()-iDayOfFirst+1;
  var iDate = 1;
  var iNext = 1;

  for (d = 0; d < 7; d++)
aMonth[1][d] = (d<iDayOfFirst)?-(iOffsetLast+d):iDate++;
  for (w = 2; w < 7; w++)
  for (d = 0; d < 7; d++)
aMonth[w][d] = (iDate<=iDaysInMonth)?iDate++:-(iNext++);
  return aMonth;
}

function fDrawCal(iYear, iMonth, iCellHeight, sDateTextSize) {
  var WeekDay = new Array("日","一","二","三","四","五","六");
  var styleTD = " bgcolor='"+gcBG+"' bordercolor='"+gcBG+"' valign='middle' align='center' height='"+iCellHeight+"' style='font:bold arial "+sDateTextSize+";";            //Coded by Hcy email:hcy110@263.net

  with (document) {
write("<tr>");
for(i=0; i<7; i++){
write("<td "+styleTD+"color:maroon' >"+ WeekDay[i] + "</td>");
}
write("</tr>");

  for (w = 1; w < 7; w++) {
write("<tr>");
for (d = 0; d < 7; d++) {
write("<td id=calCell "+styleTD+"cursor:hand;' onMouseOver='this.bgColor=gcToggle' onMouseOut='this.bgColor=gcBG' onclick='fSetSelected(this)'>");
write("<font id=cellText Victor='Hcy_Flag'> </font>");
write("</td>")
}
write("</tr>");
}
  }
}

function fUpdateCal(iYear, iMonth) {
  myMonth = fBuildCal(iYear, iMonth);
  var i = 0;
  for (w = 0; w < 6; w++)
for (d = 0; d < 7; d++)
with (cellText[(7*w)+d]) {
Victor = i++;
if (myMonth[w+1][d]<0) {
color = gcGray;
innerText = -myMonth[w+1][d];
}else{
color = ((d==0)||(d==6))?"red":"black";
innerText = myMonth[w+1][d];
}
}
}

function fSetYearMon(iYear, iMon){
  tbSelMonth.options[iMon-1].selected = true;
  for (i = 0; i < tbSelYear.length; i++)
if (tbSelYear.options[i].value == iYear)
tbSelYear.options[i].selected = true;
  fUpdateCal(iYear, iMon);
}

function fPrevMonth(){
  var iMon = tbSelMonth.value;
  var iYear = tbSelYear.value;
 
  if (--iMon<1) {
  iMon = 12;
  iYear--;
  }
 
  fSetYearMon(iYear, iMon);
}

function fNextMonth(){
  var iMon = tbSelMonth.value;
  var iYear = tbSelYear.value;
 
  if (++iMon>12) {
  iMon = 1;
  iYear++;
  }
 
  fSetYearMon(iYear, iMon);
}

function fToggleTags(){
  with (document.all.tags("SELECT")){
for (i=0; i<length; i++)
if ((item(i).Victor!="Won")&&fTagInBound(item(i))){
item(i).style.visibility = "hidden";
goSelectTag[goSelectTag.length] = item(i);
}
  }
}

function fTagInBound(aTag){
  with (VicPopCal.style){
  var l = parseInt(left);
  var t = parseInt(top);
  var r = l+parseInt(width);
  var b = t+parseInt(height);
var ptLT = fGetXY(aTag);
return !((ptLT.x>r)||(ptLT.x+aTag.offsetWidth<l)||(ptLT.y>b)||(ptLT.y+aTag.offsetHeight<t));
  }
}

function fGetXY(aTag){
  var oTmp = aTag;
  var pt = new Point(0,0);
  do {
  pt.x += oTmp.offsetLeft;
  pt.y += oTmp.offsetTop;
  oTmp = oTmp.offsetParent;
  } while(oTmp.tagName!="BODY");
  return pt;
}

// Main: popCtrl is the widget beyond which you want this calendar to appear;
//      dateCtrl is the widget into which you want to put the selected date.
// i.e.: <input type="text" name="dc" style="text-align:center" readonly><INPUT type="button" value="V" onclick="fPopCalendar(dc,dc);return false">
function fPopCalendar(popCtrl, dateCtrl,strDate){
  if (popCtrl == previousObject){
  if (VicPopCal.style.visibility == "visible"){
  HiddenDiv();
  return true;
  }
 
  }
  previousObject = popCtrl;
  gdCtrl = dateCtrl;
  fInitialDate(strDate);
  fSetYearMon(giYear, giMonth);
  var point = fGetXY(popCtrl);
  with (VicPopCal.style) {
  left = point.x;
top  = point.y+popCtrl.offsetHeight;
width = VicPopCal.offsetWidth;
width = 210; //
height = VicPopCal.offsetHeight;
fToggleTags(point);
visibility = 'visible';
  }
}

// Added by Han Chen
function fInitialDate(strDate){
if( strDate == null || strDate.length != 10 )
return false;

var sYear  = strDate.substring(0,4);
var sMonth = strDate.substring(5,7);
var sDay  = strDate.substring(8,10);

if( sMonth.charAt(0) == '0' ) { sMonth = sMonth.substring(1,2); }
if( sDay.charAt(0)  == '0' ) { sDay  = sDay.substring(1,2);  }

var nYear  = parseInt(sYear );
var nMonth = parseInt(sMonth);
var nDay  = parseInt(sDay  );

if ( isNaN(nYear ) ) return false;
if ( isNaN(nMonth) ) return false;
if ( isNaN(nDay  ) ) return false;

var arrMon = new Array(12);
arrMon[ 0] = 31; arrMon[ 1] = nYear % 4 == 0 ? 29:28;
arrMon[ 2] = 31; arrMon[ 3] = 30;
arrMon[ 4] = 31; arrMon[ 5] = 30;
arrMon[ 6] = 31; arrMon[ 7] = 31;
arrMon[ 8] = 30; arrMon[ 9] = 31;
arrMon[10] = 30; arrMon[11] = 31;

if ( nYear  < 1900 || nYear > 2100 ) return false;
if ( nMonth < 1 || nMonth > 12 ) return false;
if ( nDay < 1 || nDay > arrMon[nMonth - 1] ) return false;

giYear  = nYear;
giMonth = nMonth;
giDay  = nDay;
return true;
}

var gMonths = 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");

with (document) {
write("<Div id='VicPopCal' style='POSITION:absolute;VISIBILITY:hidden;border:2px ridge;z-index:100;'>");
write("<table border='0' bgcolor='#cccccc'>");
write("<TR>");
write("<td valign='middle' align='center'><input type='button' name='PrevMonth' value='<' style='height:20;width:20;FONT:bold' onClick='fPrevMonth()'>");
write(" <SELECT name='tbSelYear' onChange='fUpdateCal(tbSelYear.value, tbSelMonth.value)' Victor='Won'>");
for(i=1950;i<2015;i++)
write("<OPTION value='"+i+"'>"+i+" 年</OPTION>");
write("</SELECT>");
write(" <select name='tbSelMonth' onChange='fUpdateCal(tbSelYear.value, tbSelMonth.value)' Victor='Won'>");
for (i=0; i<12; i++)
write("<option value='"+(i+1)+"'>"+gMonths[i]+"</option>");
write("</SELECT>");
write(" <input type='button' name='PrevMonth' value='>' style='height:20;width:20;FONT:bold' onclick='fNextMonth()'>");
write("</td>");
write("</TR><TR>");
write("<td align='center'>");
write("<DIV style='background-color:teal'><table width='100%' border='0'>");
fDrawCal(giYear, giMonth, 20, '12');
write("</table></DIV>");
write("</td>");
write("</TR><TR><TD align='center'>");
write("<TABLE width='100%'><TR><TD align='center'>");
write("<B style='cursor:hand' onclick='fSetDate(0,0,0)' onMouseOver='this.style.color=gcToggle' onMouseOut='this.style.color=0'>清空</B>");
write("</td><td algin='center'>");
write("<B style='cursor:hand' onclick='fSetDate(giYear,giMonth,giDay)' onMouseOver='this.style.color=gcToggle' onMouseOut='this.style.color=0'>今天: "+giYear+"-"+giMonth+"-"+giDay+"</B>");
write("</td></tr></table>");
write("</TD></TR>");
write("</TABLE></Div>");
}
//-->


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调用方法：
index.htm
<input name="birthday" onClick="fPopCalendar(birthday,birthday);return false")>