引用：http://wanshiruyi1989.blog.163.com/blog/static/2879929620083118272307/

在用表单收集信息时难免会让浏览者填些日期类型的数据，但由于日期的特殊格式不方便填写，如果能给浏览者提供一个控件使其方便的操作是我们所希望的。这里有个日期选择控件，用鼠标点击几下，一切就轻松搞定，试试吧！

HTML文件如下：

<html>
<head>
<title>Date</title>
<style>
  body,div,td{
  font-size:12px;}
</style>
<script language="javascript" type="text/javascript" src="changedate.js"></script>
<script language="javascript" type="text/javascript">
function config()
{
 var strdate,stry,strm,strd;
 var dateobj = new Date();
 stry = dateobj.getYear();
 strm = dateobj.getMonth();
 strd = dateobj.getDay();
 strdate = stry + "-" + strm + "-" +strd;
 document.getElementById("date").value = strdate;
}
</script>
</head>
<body οnlοad="config();">
<input id="date" size="10" onClick="popUpCalendar(this, this, 'yyyy-mm-dd')" readonly="readonly" />
</body>
</html>

JS文件（changedate.js）如下：

var fixedX = -1   // x position (-1 if to appear below control)
 var fixedY = -1   // y position (-1 if to appear below control)
 var startAt = 1   // 0 - sunday ; 1 - monday
 var showWeekNumber = 0 // 0 - don't show; 1 - show
 var showToday = 0  // 0 - don't show; 1 - show
 var imgDir = "images/"   // directory for images ... e.g. var imgDir="/img/"

var gotoString = "Go To Current Month"
 var todayString = "Today is"
 var weekString = "Wk"
 var scrollLeftMessage = "选择上个月."
 var scrollRightMessage = "选择下个月."
 var selectMonthMessage = "点这里选择一个月份."
 var selectYearMessage = "点这里选择年."
 var selectDateMessage = "选择日期： [date] " // do not replace [date], it will be replaced by date.

var crossobj, crossMonthObj, crossYearObj, monthSelected, yearSelected, dateSelected, omonthSelected, oyearSelected, odateSelected, monthConstructed, yearConstructed, intervalID1, intervalID2, timeoutID1, timeoutID2, ctlToPlaceValue, ctlNow, dateFormat, nStartingYear, nStartingMonth

var bPageLoaded=false
 
 var ie = false;
 var dom=document.getElementById

var ns4=document.layers
 var today = new Date()
 var dateNow  = today.getDate()
 var monthNow = today.getMonth()
 var yearNow  = today.getYear()
 var imgsrc = new Array("drop1.gif","drop2.gif","left1.gif","left2.gif","right1.gif","right2.gif")
 var img = new Array()

var bShow = false;
 
 if((navigator.userAgent.toLowerCase().indexOf("opera") == -1) && (navigator.userAgent.toLowerCase().indexOf("msie") != -1))
 {
    ie = true;
 }

/* hides <select> and <applet> objects (for IE only) */
    function hideElement( elmID, overDiv )
    {
      if( ie )
      {
        for( i = 0; i < document.all.tags( elmID ).length; i++ )
        {
          obj = document.all.tags( elmID )[i];
          if( !obj || !obj.offsetParent )
          {
            continue;
          }
      
          // Find the element's offsetTop and offsetLeft relative to the BODY tag.
          objLeft   = obj.offsetLeft;
          objTop    = obj.offsetTop;
          objParent = obj.offsetParent;
          
          while( objParent.tagName.toUpperCase() != "BODY" )
          {
            objLeft  += objParent.offsetLeft;
            objTop   += objParent.offsetTop;
            objParent = objParent.offsetParent;
          }
      
          objHeight = obj.offsetHeight;
          objWidth = obj.offsetWidth;
      
          if(( overDiv.offsetLeft + overDiv.offsetWidth ) <= objLeft );
          else if(( overDiv.offsetTop + overDiv.offsetHeight ) <= objTop );
          else if( overDiv.offsetTop >= ( objTop + objHeight ));
          else if( overDiv.offsetLeft >= ( objLeft + objWidth ));
          else
          {
            obj.style.visibility = "hidden";
          }
        }
      }
    }
     
    /*
    * unhides <select> and <applet> objects (for IE only)
    */
    function showElement( elmID )
    {
      if( ie )
      {
        for( i = 0; i < document.all.tags( elmID ).length; i++ )
        {
          obj = document.all.tags( elmID )[i];
          
          if( !obj || !obj.offsetParent )
          {
            continue;
          }
        
          obj.style.visibility = "";
        }
      }
    }

function HolidayRec (d, m, y, desc)
 {
  this.d = d
  this.m = m
  this.y = y
  this.desc = desc
 }

var HolidaysCounter = 0
 var Holidays = new Array()

function addHoliday (d, m, y, desc)
 {
  Holidays[HolidaysCounter++] = new HolidayRec ( d, m, y, desc )
 }

if (dom)
 {
  for (i=0;i<imgsrc.length;i++)
  {
   img[i] = new Image
   img[i].src = imgDir + imgsrc[i]
  }
  document.write ("<div οnclick='bShow=true' id='calendar' style='z-index:+999;position:absolute;visibility:hidden;'><table width="+((showWeekNumber==1)?250:220)+" style='font-family:arial;font-size:11px;border-width:1;border-style:solid;border-color:#a0a0a0;font-family:arial; font-size:11px}' bgcolor='#ffffff'><tr bgcolor='#0000aa'><td><table width='"+((showWeekNumber==1)?248:218)+"'><tr><td style='padding:2px;font-family:arial; font-size:11px;'><font color='#ffffff'><B><span id='caption'></span></B></font></td><td align=right><a href='javascript:hideCalendar()'><IMG SRC='"+imgDir+"close.gif' WIDTH='15' HEIGHT='13' BORDER='0' ALT='关闭'></a></td></tr></table></td></tr><tr><td style='padding:5px' bgcolor=#ffffff><span id='content'></span></td></tr>")
   
  if (showToday==1)
  {
   document.write ("<tr bgcolor=#f0f0f0><td style='padding:5px' align=center><span id='lblToday'></span></td></tr>")
  }
   
  document.write ("</table></div><div id='selectMonth' style='z-index:+999;position:absolute;visibility:hidden;'></div><div id='selectYear' style='z-index:+999;position:absolute;visibility:hidden;'></div>");
 }

var monthName = new Array("01","02","03","04","05","06","07","08","09","10","11","12")
 var monthName2 = new Array("01","02","03","04","05","06","07","08","09","10","11","12")
 if (startAt==0)
 {
  dayName = new Array ("日","一","二","三","四","五","六")
 }
 else
 {
  dayName = new Array ("一","二","三","四","五","六","日")
 }
 var styleAnchor="text-decoration:none;color:black;"
 var styleLightBorder="border-style:solid;border-width:1px;border-color:#a0a0a0;"

function swapImage(srcImg, destImg){
  if (ie) { document.getElementById(srcImg).setAttribute("src",imgDir + destImg) }
 }

function init() {
  if (!ns4)
  {
   if (!ie) { yearNow += 1900 }

crossobj=(dom)?document.getElementById("calendar").style : ie? document.all.calendar : document.calendar
   hideCalendar()

crossMonthObj=(dom)?document.getElementById("selectMonth").style : ie? document.all.selectMonth : document.selectMonth

crossYearObj=(dom)?document.getElementById("selectYear").style : ie? document.all.selectYear : document.selectYear

monthConstructed=false;
   yearConstructed=false;

if (showToday==1)
   {
    document.getElementById("lblToday").innerHTML = todayString + " <a οnmοusemοve='window.status=\""+gotoString+"\"' οnmοuseοut='window.status=\"\"' title='"+gotoString+"' style='"+styleAnchor+"' href='javascript:monthSelected=monthNow;yearSelected=yearNow;constructCalendar();'>"+dayName[(today.getDay()-startAt==-1)?6:(today.getDay()-startAt)]+", " + dateNow + " " + monthName[monthNow].substring(0,3) + " " + yearNow + "</a>"
   }

sHTML1="<span id='spanLeft' style='border-style:solid;border-width:1;border-color:#3366FF;cursor:pointer' οnmοuseοver='swapImage(\"changeLeft\",\"left2.gif\");this.style.borderColor=\"#88AAFF\";window.status=\""+scrollLeftMessage+"\"' οnclick='javascript:decMonth()' οnmοuseοut='clearInterval(intervalID1);swapImage(\"changeLeft\",\"left1.gif\");this.style.borderColor=\"#3366FF\";window.status=\"\"' οnmοusedοwn='clearTimeout(timeoutID1);timeoutID1=setTimeout(\"StartDecMonth()\",500)' οnmοuseup='clearTimeout(timeoutID1);clearInterval(intervalID1)'>&nbsp<IMG id='changeLeft' SRC='"+imgDir+"left1.gif' width=10 height=11 BORDER=0>&nbsp</span>&nbsp;"
   sHTML1+="<span id='spanRight' style='border-style:solid;border-width:1;border-color:#3366FF;cursor:pointer' οnmοuseοver='swapImage(\"changeRight\",\"right2.gif\");this.style.borderColor=\"#88AAFF\";window.status=\""+scrollRightMessage+"\"' οnmοuseοut='clearInterval(intervalID1);swapImage(\"changeRight\",\"right1.gif\");this.style.borderColor=\"#3366FF\";window.status=\"\"' οnclick='incMonth()' οnmοusedοwn='clearTimeout(timeoutID1);timeoutID1=setTimeout(\"StartIncMonth()\",500)' οnmοuseup='clearTimeout(timeoutID1);clearInterval(intervalID1)'>&nbsp<IMG id='changeRight' SRC='"+imgDir+"right1.gif' width=10 height=11 BORDER=0>&nbsp</span>&nbsp"
   sHTML1+="<span id='spanMonth' style='border-style:solid;border-width:1;border-color:#3366FF;cursor:pointer' οnmοuseοver='swapImage(\"changeMonth\",\"drop2.gif\");this.style.borderColor=\"#88AAFF\";window.status=\""+selectMonthMessage+"\"' οnmοuseοut='swapImage(\"changeMonth\",\"drop1.gif\");this.style.borderColor=\"#3366FF\";window.status=\"\"' οnclick='popUpMonth()'></span>&nbsp;"
   sHTML1+="<span id='spanYear' style='border-style:solid;border-width:1;border-color:#3366FF;cursor:pointer' οnmοuseοver='swapImage(\"changeYear\",\"drop2.gif\");this.style.borderColor=\"#88AAFF\";window.status=\""+selectYearMessage+"\"' οnmοuseοut='swapImage(\"changeYear\",\"drop1.gif\");this.style.borderColor=\"#3366FF\";window.status=\"\"' οnclick='popUpYear()'></span>&nbsp;"
   
   document.getElementById("caption").innerHTML  = sHTML1

bPageLoaded=true
  }
 }

function hideCalendar() {
  crossobj.visibility="hidden"
  if (crossMonthObj != null){crossMonthObj.visibility="hidden"}
  if (crossYearObj != null){crossYearObj.visibility="hidden"}

showElement( 'SELECT' );
  showElement( 'APPLET' );
 }

function padZero(num) {
  return (num < 10)? '0' + num : num ;
 }

function constructDate(d,m,y)
 {
  sTmp = dateFormat
  sTmp = sTmp.replace ("dd","<e>")
  sTmp = sTmp.replace ("d","<d>")
  sTmp = sTmp.replace ("<e>",padZero(d))
  sTmp = sTmp.replace ("<d>",d)
  sTmp = sTmp.replace ("mmmm","<p>")
  sTmp = sTmp.replace ("mmm","<o>")
  sTmp = sTmp.replace ("mm","<n>")
  sTmp = sTmp.replace ("m","<m>")
  sTmp = sTmp.replace ("<m>",m+1)
  sTmp = sTmp.replace ("<n>",padZero(m+1))
  sTmp = sTmp.replace ("<o>",monthName[m])
  sTmp = sTmp.replace ("<p>",monthName2[m])
  sTmp = sTmp.replace ("yyyy",y)
  return sTmp.replace ("yy",padZero(y%100))
 }

function closeCalendar() {
  var sTmp

hideCalendar();
  ctlToPlaceValue.value = constructDate(dateSelected,monthSelected,yearSelected)
 }

/*** Month Pulldown ***/

function StartDecMonth()
 {
  intervalID1=setInterval("decMonth()",80)
 }

function StartIncMonth()
 {
  intervalID1=setInterval("incMonth()",80)
 }

function incMonth () {
  monthSelected++
  if (monthSelected>11) {
   monthSelected=0
   yearSelected++
  }
  constructCalendar()
 }

function decMonth () {
  monthSelected--
  if (monthSelected<0) {
   monthSelected=11
   yearSelected--
  }
  constructCalendar()
 }
 
 function upMonth() {
  if(nStartingMonth > 0)
  {
   nStartingMonth --;
   for (i=0; i<6; i++)
   {
    newMonth = (i + nStartingMonth);
    if (newMonth == monthSelected)
     txtMonth = "&nbsp;<B>" + monthName[newMonth] + "</B>&nbsp;";
    else
     txtMonth = "&nbsp;" + monthName[newMonth] + "&nbsp;";
    document.getElementById("m"+i).innerHTML = txtMonth;
   }
  }
  bShow=true
 }

function downMonth() {
  if(nStartingMonth < 6)
  {
   nStartingMonth ++;
   for (i=0; i<6; i++)
   {
    newMonth = (i + nStartingMonth);
    if (newMonth == monthSelected)
     txtMonth = "&nbsp;<B>" + monthName[newMonth] + "</B>&nbsp;";
    else
     txtMonth = "&nbsp;" + monthName[newMonth] + "&nbsp;";
    document.getElementById("m"+i).innerHTML = txtMonth;
   }
  }
  bShow=true
 }

function selectMonth(nMonth) {
  monthSelected=parseInt(nMonth+nStartingMonth);
  monthConstructed=false;
  constructCalendar();
  popDownMonth();
 }
 
 function constructMonth() {
  popDownYear()
  if (!monthConstructed) {

sHTML = "<tr><td align='center' οnmοuseοver='this.style.backgroundColor=\"#FFCC99\"' οnmοuseοut='clearInterval(intervalID1);this.style.backgroundColor=\"\"' style='cursor:pointer' οnmοusedοwn='clearInterval(intervalID1);intervalID1=setInterval(\"upMonth()\",30)' οnmοuseup='clearInterval(intervalID1)'>-</td></tr>"

j=0;
   i=(monthSelected-3);
   if(i < 0)
    i=0;
   if(i > 6)
    i=6;
   nStartingMonth = i;
   for (ii=0; ii<6; ii++, i++, j++) {
    sName = monthName[i];
    if (i==monthSelected){
     sName = "<B>" + sName + "</B>"
    }
    sHTML += "<tr><td id='m" + j + "' οnmοuseοver='this.style.backgroundColor=\"#FFCC99\"' οnmοuseοut='this.style.backgroundColor=\"\"' style='cursor:pointer' οnclick='selectMonth(" + j + ");event.cancelBubble=true'>&nbsp;" + sName + "&nbsp;</td></tr>"
   }

sHTML += "<tr><td align='center' οnmοuseοver='this.style.backgroundColor=\"#FFCC99\"' οnmοuseοut='clearInterval(intervalID2);this.style.backgroundColor=\"\"' style='cursor:pointer' οnmοusedοwn='clearInterval(intervalID2);intervalID2=setInterval(\"downMonth()\",30)' οnmοuseup='clearInterval(intervalID2)'>+</td></tr>"

document.getElementById("selectMonth").innerHTML = "<table width=32 style='font-family:arial; font-size:11px; border-width:1; border-style:solid; border-color:#a0a0a0;' bgcolor='#FFFFDD' cellspacing=0 οnmοuseοver='clearTimeout(timeoutID1)' οnmοuseοut='clearTimeout(timeoutID1);timeoutID1=setTimeout(\"popDownMonth()\",100);event.cancelBubble=true'>" + sHTML + "</table>"

monthConstructed=true
  }
 }
 function popUpMonth() {
  constructMonth()
  crossMonthObj.visibility = (dom||ie)? "visible" : "show"
  crossMonthObj.left = parseInt(crossobj.left) + 50
  crossMonthObj.top = parseInt(crossobj.top) + 26

hideElement( 'SELECT', document.getElementById("selectMonth") );
  hideElement( 'APPLET', document.getElementById("selectMonth") );   
 }

function popDownMonth() {
  crossMonthObj.visibility= "hidden"
 }

/*** Year Pulldown ***/

function incYear() {
  for (i=0; i<6; i++){
   newYear = (i+nStartingYear)+1
   if (newYear==yearSelected)
   { txtYear = "&nbsp;<B>" + newYear + "</B>&nbsp;" }
   else
   { txtYear = "&nbsp;" + newYear + "&nbsp;" }
   document.getElementById("y"+i).innerHTML = txtYear
  }
  nStartingYear ++;
  bShow=true
 }

function decYear() {
  for (i=0; i<6; i++){
   newYear = (i+nStartingYear)-1
   if (newYear==yearSelected)
   { txtYear = "&nbsp;<B>" + newYear + "</B>&nbsp;" }
   else
   { txtYear = "&nbsp;" + newYear + "&nbsp;" }
   document.getElementById("y"+i).innerHTML = txtYear
  }
  nStartingYear --;
  bShow=true
 }

function selectYear(nYear) {
  yearSelected=parseInt(nYear+nStartingYear);
  yearConstructed=false;
  constructCalendar();
  popDownYear();
 }

function constructYear() {
  popDownMonth()
  sHTML = ""
  if (!yearConstructed) {

sHTML = "<tr><td align='center' οnmοuseοver='this.style.backgroundColor=\"#FFCC99\"' οnmοuseοut='clearInterval(intervalID1);this.style.backgroundColor=\"\"' style='cursor:pointer' οnmοusedοwn='clearInterval(intervalID1);intervalID1=setInterval(\"decYear()\",30)' οnmοuseup='clearInterval(intervalID1)'>-</td></tr>"

j = 0
   nStartingYear = yearSelected-3
   for (i=(yearSelected-3); i<(yearSelected+3); i++) {
    sName = i;
    if (i==yearSelected){
     sName = "<B>" + sName + "</B>"
    }

sHTML += "<tr><td id='y" + j + "' οnmοuseοver='this.style.backgroundColor=\"#FFCC99\"' οnmοuseοut='this.style.backgroundColor=\"\"' style='cursor:pointer' οnclick='selectYear("+j+");event.cancelBubble=true'>&nbsp;" + sName + "&nbsp;</td></tr>"
    j ++;
   }

sHTML += "<tr><td align='center' οnmοuseοver='this.style.backgroundColor=\"#FFCC99\"' οnmοuseοut='clearInterval(intervalID2);this.style.backgroundColor=\"\"' style='cursor:pointer' οnmοusedοwn='clearInterval(intervalID2);intervalID2=setInterval(\"incYear()\",30)' οnmοuseup='clearInterval(intervalID2)'>+</td></tr>"

document.getElementById("selectYear").innerHTML = "<table width=45 style='font-family:arial; font-size:11px; border-width:1; border-style:solid; border-color:#a0a0a0;' bgcolor='#FFFFDD' οnmοuseοver='clearTimeout(timeoutID2)' οnmοuseοut='clearTimeout(timeoutID2);timeoutID2=setTimeout(\"popDownYear()\",100)' cellspacing=0>" + sHTML + "</table>"

yearConstructed = true
  }
 }

function popDownYear() {
  clearInterval(intervalID1)
  clearTimeout(timeoutID1)
  clearInterval(intervalID2)
  clearTimeout(timeoutID2)
  crossYearObj.visibility= "hidden"
 }

function popUpYear() {
  var leftOffset

constructYear()
  crossYearObj.visibility = (dom||ie)? "visible" : "show"
  leftOffset = parseInt(crossobj.left) + document.getElementById("spanYear").offsetLeft
  if (ie)
  {
   leftOffset += 6
  }
  crossYearObj.left = leftOffset
  crossYearObj.top = parseInt(crossobj.top) + 26
 }

/*** calendar ***/
   function WeekNbr(n) {
      // Algorithm used:
      // From Klaus Tondering's Calendar document (The Authority/Guru)
      // hhtp://www.tondering.dk/claus/calendar.html
      // a = (14-month) / 12
      // y = year + 4800 - a
      // m = month + 12a - 3
      // J = day + (153m + 2) / 5 + 365y + y / 4 - y / 100 + y / 400 - 32045
      // d4 = (J + 31741 - (J mod 7)) mod 146097 mod 36524 mod 1461
      // L = d4 / 1460
      // d1 = ((d4 - L) mod 365) + L
      // WeekNumber = d1 / 7 + 1
 
      year = n.getFullYear();
      month = n.getMonth() + 1;
      if (startAt == 0) {
         day = n.getDate() + 1;
      }
      else {
         day = n.getDate();
      }
 
      a = Math.floor((14-month) / 12);
      y = year + 4800 - a;
      m = month + 12 * a - 3;
      b = Math.floor(y/4) - Math.floor(y/100) + Math.floor(y/400);
      J = day + Math.floor((153 * m + 2) / 5) + 365 * y + b - 32045;
      d4 = (((J + 31741 - (J % 7)) % 146097) % 36524) % 1461;
      L = Math.floor(d4 / 1460);
      d1 = ((d4 - L) % 365) + L;
      week = Math.floor(d1/7) + 1;
 
      return week;
   }

function constructCalendar () {
  var aNumDays = Array (31,0,31,30,31,30,31,31,30,31,30,31)

var dateMessage
  var startDate = new Date (yearSelected,monthSelected,1)
  var endDate

if (monthSelected==1)
  {
   endDate = new Date (yearSelected,monthSelected+1,1);
   endDate = new Date (endDate - (24*60*60*1000));
   numDaysInMonth = endDate.getDate()
  }
  else
  {
   numDaysInMonth = aNumDays[monthSelected];
  }

datePointer = 0
  dayPointer = startDate.getDay() - startAt
  
  if (dayPointer<0)
  {
   dayPointer = 6
  }

sHTML = "<table  border=0 style='font-family:verdana;font-size:10px;'><tr>"

if (showWeekNumber==1)
  {
   sHTML += "<td width=27><b>" + weekString + "</b></td><td width=1 rowspan=7 bgcolor='#d0d0d0' style='padding:0px'><img src='"+imgDir+"divider.gif' width=1></td>"
  }

for (i=0; i<7; i++) {
   sHTML += "<td width='27' align='right'><B>"+ dayName[i]+"</B></td>"
  }
  sHTML +="</tr><tr>"
  
  if (showWeekNumber==1)
  {
   sHTML += "<td align=right>" + WeekNbr(startDate) + "&nbsp;</td>"
  }

for ( var i=1; i<=dayPointer;i++ )
  {
   sHTML += "<td>&nbsp;</td>"
  }
 
  for ( datePointer=1; datePointer<=numDaysInMonth; datePointer++ )
  {
   dayPointer++;
   sHTML += "<td align=right class="xyz">"
   sStyle=styleAnchor
   if ((datePointer==odateSelected) && (monthSelected==omonthSelected) && (yearSelected==oyearSelected))
   { sStyle+=styleLightBorder }

sHint = ""
   for (k=0;k<HolidaysCounter;k++)
   {
    if ((parseInt(Holidays[k].d)==datePointer)&&(parseInt(Holidays[k].m)==(monthSelected+1)))
    {
     if ((parseInt(Holidays[k].y)==0)||((parseInt(Holidays[k].y)==yearSelected)&&(parseInt(Holidays[k].y)!=0)))
     {
      sStyle+="background-color:#FFDDDD;"
      sHint+=sHint==""?Holidays[k].desc:"\n"+Holidays[k].desc
     }
    }
   }

var regexp= /\"/g
   sHint=sHint.replace(regexp,"&quot;")

dateMessage = "οnmοusemοve='window.status=\""+selectDateMessage.replace("[date]",constructDate(datePointer,monthSelected,yearSelected))+"\"' οnmοuseοut='window.status=\"\"' "

if ((datePointer==dateNow)&&(monthSelected==monthNow)&&(yearSelected==yearNow))
   { sHTML += "<a "+dateMessage+" title=\"" + sHint + "\" style='"+sStyle+"' href='javascript:dateSelected="+datePointer+";closeCalendar();'>&nbsp;<font color=#ff0000>" + datePointer + "</font>&nbsp;</a>"}
   else if (dayPointer % 7 == (startAt * -1)+1)
   { sHTML += "<a "+dateMessage+" title=\"" + sHint + "\" style='"+sStyle+"' href='javascript:dateSelected="+datePointer + ";closeCalendar();'>&nbsp;<font color=#909090>" + datePointer + "</font>&nbsp;</a>" }
   else
   { sHTML += "<a "+dateMessage+" title=\"" + sHint + "\" style='"+sStyle+"' href='javascript:dateSelected="+datePointer + ";closeCalendar();'>&nbsp;" + datePointer + "&nbsp;</a>" }

sHTML += ""
   if ((dayPointer+startAt) % 7 == startAt) { 
    sHTML += "</tr><tr>" 
    if ((showWeekNumber==1)&&(datePointer<numDaysInMonth))
    {
     sHTML += "<td align=right>" + (WeekNbr(new Date(yearSelected,monthSelected,datePointer+1))) + "&nbsp;</td>"
    }
   }
  }

document.getElementById("content").innerHTML   = sHTML
  document.getElementById("spanMonth").innerHTML = "&nbsp;" + monthName[monthSelected] + "&nbsp;<IMG id='changeMonth' SRC='"+imgDir+"drop1.gif' WIDTH='12' HEIGHT='10' BORDER=0>"
  document.getElementById("spanYear").innerHTML = "&nbsp;" + yearSelected + "&nbsp;<IMG id='changeYear' SRC='"+imgDir+"drop1.gif' WIDTH='12' HEIGHT='10' BORDER=0>"
 }

function popUpCalendar(ctl, ctl2, format) {
  var leftpos=0
  var toppos=0

if (bPageLoaded)
  {
   if ( crossobj.visibility == "hidden" ) {
    ctlToPlaceValue = ctl2
    dateFormat=format;

formatChar = " "
    aFormat = dateFormat.split(formatChar)
    if (aFormat.length<3)
    {
     formatChar = "/"
     aFormat = dateFormat.split(formatChar)
     if (aFormat.length<3)
     {
      formatChar = "."
      aFormat = dateFormat.split(formatChar)
      if (aFormat.length<3)
      {
       formatChar = "-"
       aFormat = dateFormat.split(formatChar)
       if (aFormat.length<3)
       {
        // invalid date format
        formatChar=""
       }
      }
     }
    }

tokensChanged = 0
    if ( formatChar != "" )
    {
     // use user's date
     aData = ctl2.value.split(formatChar)

for (i=0;i<3;i++)
     {
      if ((aFormat[i]=="d") || (aFormat[i]=="dd"))
      {
       dateSelected = parseInt(aData[i], 10)
       tokensChanged ++
      }
      else if ((aFormat[i]=="m") || (aFormat[i]=="mm"))
      {
       monthSelected = parseInt(aData[i], 10) - 1
       tokensChanged ++
      }
      else if (aFormat[i]=="yyyy")
      {
       yearSelected = parseInt(aData[i], 10)
       tokensChanged ++
      }
      else if (aFormat[i]=="mmm")
      {
       for (j=0; j<12; j++)
       {
        if (aData[i]==monthName[j])
        {
         monthSelected=j
         tokensChanged ++
        }
       }
      }
      else if (aFormat[i]=="mmmm")
      {
       for (j=0; j<12; j++)
       {
        if (aData[i]==monthName2[j])
        {
         monthSelected=j
         tokensChanged ++
        }
       }
      }
     }
    }

if ((tokensChanged!=3)||isNaN(dateSelected)||isNaN(monthSelected)||isNaN(yearSelected))
    {
     dateSelected = dateNow
     monthSelected = monthNow
     yearSelected = yearNow
    }

odateSelected=dateSelected
    omonthSelected=monthSelected
    oyearSelected=yearSelected

aTag = ctl
    do {
     aTag = aTag.offsetParent;
     leftpos += aTag.offsetLeft;
     toppos += aTag.offsetTop;
    } while(aTag.tagName!="BODY");

crossobj.left = fixedX==-1 ? ctl.offsetLeft + leftpos : fixedX
    crossobj.top = fixedY==-1 ? ctl.offsetTop + toppos + ctl.offsetHeight + 2 : fixedY
    constructCalendar (1, monthSelected, yearSelected);
    crossobj.visibility=(dom||ie)? "visible" : "show"

hideElement( 'SELECT', document.getElementById("calendar") );
    hideElement( 'APPLET', document.getElementById("calendar") );

bShow = true;
   }
   else
   {
    hideCalendar()
    if (ctlNow!=ctl) {popUpCalendar(ctl, ctl2, format)}
   }
   ctlNow = ctl
  }
 }

document.onkeypress = function hidecal1 () { 
  if (event.keyCode==27) 
  {
   hideCalendar()
  }
 }
 document.onclick = function hidecal2 () {   
  if (!bShow)
  {
   hideCalendar()
  }
  bShow = false
 }

if(ie)
 {
  init()
 }
 else
 {
  window.οnlοad=init

转载于:https://www.cnblogs.com/sode/archive/2012/08/21/2649406.html

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