Popup calendar date choosing

Written by @kerixa 24 February 2014
A simple but very useful popup calendar for choosing date. This calendar will be opened in the new small window and user can choose the date, simple. Written by html and javascript. No additional resource is needed.
Code Snippet:

                                                
                                                <!-- this script is provided by https://www.htmlbestcodes.com coded by: Kerixa Inc. -->
<!-- this script got from www.htmlbestcodes.com-Coded by: Krishna Eydat -->
<html>
<head>
</head>
<body>

<script language="javascript">
var fontFace="verdana";
var fontSize=9;

var titleWidth=90;
var titleMode=1;
var dayWidth=12;
var dayDigits=1;

var titleColor="#cccccc";
var daysColor="#cccccc";
var bodyColor="#ffffff";
var dayColor="#ffffff";
var currentDayColor="#333333";
var footColor="#cccccc";
var borderColor="#333333";

var titleFontColor = "#333333";
var daysFontColor = "#333333";
var dayFontColor = "#333333";
var currentDayFontColor = "#ffffff";
var footFontColor = "#333333";

var calFormat = "yyyy/mm/dd";

var weekDay = 0;
// ------

// codes
var calWidth=200, calHeight=200, calOffsetX=-200, calOffsetY=16;
var calWin=null;
var winX=0, winY=0;
var cal="cal";
var cals=new Array();
var currentCal=null;

var yxMonths=new Array("January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December");
var yxDays=new Array("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday");
var yxLinks=new Array("[close]", "[clear]");

var nav=navigator.userAgent.toLowerCase();;
var isOpera=(nav.indexOf("opera")!=-1)?true:false;
var isOpera5=(nav.indexOf("opera 5")!=-1 || nav.indexOf("opera/5")!=-1)?true:false;
var isOpera6=(isOpera && parseInt(navigator.appVersion)>=6)?true:false;
var isN6=(nav.indexOf("gecko")!=-1);
var isN4=(document.layers)?true:false;
var isMac=(nav.indexOf("mac")!=-1);
var isIE=(document.all && !isOpera && (!isMac || navigator.appVersion.indexOf("MSIE 4")==-1))?true:false;

if (isN4) {
  fontSize+=2;
}

var span2="</span>";

function span1(tag) {
  return "<span class='"+tag+"'>";
}
function spanx(tag, color) {
  return "."+tag+" { font-family:"+fontFace+"; font-size:"+fontSize+"px; color:"+color+"; }\n";
}

function a1(tag) {
  return "<a class='"+tag+"' href=";
}

function ax(tag, color) {
  return "."+tag+" { text-decoration:none; color:"+color+"; }\n";
}

function calOBJ(name, title, field, form) {
  this.name = name;
  this.title = title;
  this.field = field;
  this.formName = form;
  this.form = null
}

function setFont(font, size) {
  if (font != "") {
    fontFace=font;
  }
  if (size > 0) {
    fontSize=size;

    if (isN4) {
      fontSize+=2;
    }
  }
}

function setWidth(tWidth, tMode, dWidth, dDigits) {
  if (tWidth > 0) {
    titleWidth=tWidth;
  }
  if (tMode == 1 || tMode == 2) {
    titleMode=tMode;
  }
  if (dWidth > 0) {
    dayWidth=dWidth;
  }
  if (dDigits > 0) {
    dayDigits=dDigits;
  }
}

function setColor(tColor, dsColor, bColor, dColor, cdColor, fColor, bdColor) {
  if (tColor != "") {
    titleColor=tColor;
  }
  if (dsColor != "") {
    daysColor=dsColor;
  }
  if (bColor != "") {
    bodyColor=bColor;
  }
  if (dColor != "") {
    dayColor=dColor;
  }
  if (cdColor != "") {
    currentDayColor=cdColor;
  }
  if (fColor != "") {
    footColor=fColor;
  }
  if (bdColor != "") {
    borderColor=bdColor;
  }
}

function setFontColor(tColorFont, dsColorFont, dColorFont, cdColorFont, fColorFont) {
  if (tColorFont != "") {
    titleFontColor=tColorFont;
  }
  if (dsColorFont != "") {
    daysFontColor=dsColorFont;
  }
  if (dColorFont != "") {
    dayFontColor=dColorFont;
  }
  if (cdColorFont != "") {
    currentDayFontColor=cdColorFont;
  }
  if (fColorFont != "") {
    footFontColor=fColorFont;
  }
}

function setFormat(format) {
  calFormat = format;
}

function setSize(width, height, ox, oy) {
  if (width > 0) {
    calWidth=width;
  }
  if (height > 0) {
    calHeight=height;
  }

  calOffsetX=ox;
  calOffsetY=oy;
}

function setWeekDay(wDay) {
  if (wDay == 0 || wDay == 1) {
    weekDay = wDay;
  }
}

function setMonthNames(janName, febName, marName, aprName, mayName, junName, julName, augName, sepName, octName, novName, decName) {
  if (janName != "") {
    yxMonths[0] = janName;
  }
  if (febName != "") {
    yxMonths[1] = febName;
  }
  if (marName != "") {
    yxMonths[2] = marName;
  }
  if (aprName != "") {
    yxMonths[3] = aprName;
  }
  if (mayName != "") {
    yxMonths[4] = mayName;
  }
  if (junName != "") {
    yxMonths[5] = junName;
  }
  if (julName != "") {
    yxMonths[6] = julName;
  }
  if (augName != "") {
    yxMonths[7] = augName;
  }
  if (sepName != "") {
    yxMonths[8] = sepName;
  }
  if (octName != "") {
    yxMonths[9] = octName;
  }
  if (novName != "") {
    yxMonths[10] = novName;
  }
  if (decName != "") {
    yxMonths[11] = decName;
  }
}

function setDayNames(sunName, monName, tueName, wedName, thuName, friName, satName) {
  if (sunName != "") {
    yxDays[0] = sunName;
    yxDays[7] = sunName;
  }
  if (monName != "") {
    yxDays[1] = monName;
  }
  if (tueName != "") {
    yxDays[2] = tueName;
  }
  if (wedName != "") {
    yxDays[3] = wedName;
  }
  if (thuName != "") {
    yxDays[4] = thuName;
  }
  if (friName != "") {
    yxDays[5] = friName;
  }
  if (satName != "") {
    yxDays[6] = satName;
  }
}

function setLinkNames(closeLink, clearLink) {
  if (closeLink != "") {
    yxLinks[0] = closeLink;
  }
  if (clearLink != "") {
    yxLinks[1] = clearLink;
  }
}

function addCalendar(name, title, field, form) {
  cals[cals.length] = new calOBJ(name, title, field, form);
}

function findCalendar(name) {
  for (var i = 0; i < cals.length; i++) {
    if (cals[i].name == name) {
      if (cals[i].form == null) {
        if (cals[i].formName == "") {
          if (document.forms[0]) {
            cals[i].form = document.forms[0];
          }
        }
        else if (document.forms[cals[i].formName]) {
          cals[i].form = document.forms[cals[i].formName];
        }
      }

      return cals[i];
    }
  }

  return null;
}

function getDayName(y,m,d) {
  var wd=new Date(y,m,d);
  return yxDays[wd.getDay()].substring(0,3);
}

function getMonthFromName(m3) {
  for (var i = 0; i < yxMonths.length; i++) {
    if (yxMonths[i].toLowerCase().substring(0,3) == m3.toLowerCase()) {
      return i;
    }
  }

  return 0;
}

function getFormat() {
  var calF = calFormat;

  calF = calF.replace(/\\/g, '\\\\');
  calF = calF.replace(/\//g, '\\\/');
  calF = calF.replace(/\[/g, '\\\[');
  calF = calF.replace(/\]/g, '\\\]');
  calF = calF.replace(/\(/g, '\\\(');
  calF = calF.replace(/\)/g, '\\\)');
  calF = calF.replace(/\{/g, '\\\{');
  calF = calF.replace(/\}/g, '\\\}');
  calF = calF.replace(/\</g, '\\\<');
  calF = calF.replace(/\>/g, '\\\>');
  calF = calF.replace(/\|/g, '\\\|');
  calF = calF.replace(/\*/g, '\\\*');
  calF = calF.replace(/\?/g, '\\\?');
  calF = calF.replace(/\+/g, '\\\+');
  calF = calF.replace(/\^/g, '\\\^');
  calF = calF.replace(/\$/g, '\\\$');

  calF = calF.replace(/dd/i, '\\d\\d');
  calF = calF.replace(/mm/i, '\\d\\d');
  calF = calF.replace(/yyyy/i, '\\d\\d\\d\\d');
  calF = calF.replace(/day/i, '\\w\\w\\w');
  calF = calF.replace(/mon/i, '\\w\\w\\w');

  return new RegExp(calF);
}

function getDateNumbers(date) {
  var y, m, d;

  var yIdx = calFormat.search(/yyyy/i);
  var mIdx = calFormat.search(/mm/i);
  var m3Idx = calFormat.search(/mon/i);
  var dIdx = calFormat.search(/dd/i);

  y=date.substring(yIdx,yIdx+4)-0;
  if (mIdx != -1) {
    m=date.substring(mIdx,mIdx+2)-1;
  }
  else {
    var m = getMonthFromName(date.substring(m3Idx,m3Idx+3));
  }
  d=date.substring(dIdx,dIdx+2)-0;

  return new Array(y,m,d);
}

function hideCal() {
  calWin.close();
  calWin = null;
  window.status = "";
}

function getLeftIE(x,m) {
  var dx=0;
  if (x.tagName=="TD"){
    dx=x.offsetLeft;
  }
  else if (x.tagName=="TABLE") {
    dx=x.offsetLeft;
    if (m) { dx+=(x.cellPadding!=""?parseInt(x.cellPadding):2); m=false; }
  }
  return dx+(x.parentElement.tagName=="BODY"?0:getLeftIE(x.parentElement,m));
}
function getTopIE(x,m) {
  var dy=0;
  if (x.tagName=="TR"){
    dy=x.offsetTop;
  }
  else if (x.tagName=="TABLE") {
    dy=x.offsetTop;
    if (m) { dy+=(x.cellPadding!=""?parseInt(x.cellPadding):2); m=false; }
  }
  return dy+(x.parentElement.tagName=="BODY"?0:getTopIE(x.parentElement,m));
}

function getLeftN4(l) { return l.pageX; }
function getTopN4(l) { return l.pageY; }

function getLeftN6(l) { return l.offsetLeft; }
function getTopN6(l) { return l.offsetTop; }

function lastDay(d) {
  var yy=d.getFullYear(), mm=d.getMonth();
  for (var i=31; i>=28; i--) {
    var nd=new Date(yy,mm,i);
    if (mm == nd.getMonth()) {
      return i;
    }
  }
}

function firstDay(d) {
  var yy=d.getFullYear(), mm=d.getMonth();
  var fd=new Date(yy,mm,1);
  return fd.getDay();
}

function dayDisplay(i) {
  if (dayDigits == 0) {
    return yxDays[i];
  }
  else {
    return yxDays[i].substring(0,dayDigits);
  }
}

function calTitle(d) {
  var yy=d.getFullYear(), mm=yxMonths[d.getMonth()];
  var s;

  if (titleMode == 2) {
    s="<tr align='center' bgcolor='"+titleColor+"'><td colspan='7'>\n<table cellpadding='0' cellspacing='0' border='0'><tr align='center' valign='middle'><td align='right'>"+span1("title")+"<b>"+a1("titlea")+"'javascript:if(window.opener && !window.opener.closed && window.opener.moveYear) window.opener.moveYear(-10)'>&nbsp;&#171;</a>&nbsp;"+a1("titlea")+"'javascript:if(window.opener && !window.opener.closed && window.opener.moveYear) window.opener.moveYear(-1)'>&#139;&nbsp;</a></b>"+span2+"</td><td width='"+titleWidth+"'><b>"+span1("title")+yy+span2+"</b></td><td align='left'>"+span1("title")+"<b>"+a1("titlea")+"'javascript:if (window.opener && !window.opener.closed && window.opener.moveYear) window.opener.moveYear(1)'>&nbsp;&#155;</a>&nbsp;"+a1("titlea")+"'javascript:if (window.opener && !window.opener.closed && window.opener.moveYear) window.opener.moveYear(10)'>&#187;&nbsp;</a></b>"+span2+"</td></tr><tr align='center' valign='middle'><td align='right'>"+span1("title")+"<b>"+a1("titlea")+"'javascript:if (window.opener && !window.opener.closed && window.opener.prepMonth) window.opener.prepMonth("+d.getMonth()+")'>&nbsp;&#139;&nbsp;</a></b>"+span2+"</td><td width='"+titleWidth+"'><b>"+span1("title")+mm+span2+"</b></td><td align='left'>"+span1("title")+"<b>"+a1("titlea")+"'javascript:if (window.opener && !window.opener.closed && window.opener.nextMonth) window.opener.nextMonth("+d.getMonth()+")'>&nbsp;&#155;&nbsp;</a></b>"+span2+"</td></tr></table>\n</td></tr><tr align='center' bgcolor='"+daysColor+"'>";
  }
  else {
    s="<tr align='center' bgcolor='"+titleColor+"'><td colspan='7'>\n<table cellpadding='0' cellspacing='0' border='0'><tr align='center' valign='middle'><td>"+span1("title")+"<b>"+a1("titlea")+"'javascript:if(window.opener && !window.opener.closed && window.opener.moveYear) window.opener.moveYear(-1)'>&nbsp;&#171;</a>&nbsp;"+a1("titlea")+"'javascript:if (window.opener && !window.opener.closed && window.opener.prepMonth) window.opener.prepMonth("+d.getMonth()+")'>&#139;&nbsp;</a></b>"+span2+"</td><td width='"+titleWidth+"'><nobr><b>"+span1("title")+mm+" "+yy+span2+"</b></nobr></td><td>"+span1("title")+"<b>"+a1("titlea")+"'javascript:if (window.opener && !window.opener.closed && window.opener.nextMonth) window.opener.nextMonth("+d.getMonth()+")'>&nbsp;&#155;</a>&nbsp;"+a1("titlea")+"'javascript:if(window.opener && !window.opener.closed && window.opener.moveYear) window.opener.moveYear(1)'>&#187;&nbsp;</a></b>"+span2+"</td></tr></table>\n</td></tr><tr align='center' bgcolor='"+daysColor+"'>";
  }

  for (var i=weekDay; i<weekDay+7; i++) {
    s+="<td width='"+dayWidth+"'>"+span1("days")+dayDisplay(i)+span2+"</td>";
  }

  s+="</tr>";

  return s;
}

function calHeader() {
  return "<head>\n<title>"+currentCal.title+"</title>\n<style type='text/css'>\n"+spanx("title",titleFontColor)+spanx("days",daysFontColor)+spanx("foot",footColor)+spanx("day",dayFontColor)+spanx("currentDay",currentDayFontColor)+ax("titlea",titleFontColor)+ax("daya",dayFontColor)+ax("currenta",currentDayFontColor)+ax("foota",footFontColor)+"</style>\n</head>\n<body>\n<table align='center' border='0' bgcolor='"+borderColor+"' cellspacing='0' cellpadding='1'><tr><td>\n<table cellspacing='1' cellpadding='3' border='0'>";
}

function calFooter() {
  return "<tr bgcolor='"+footColor+"'><td colspan='7' align='center'>"+span1("foot")+"<b>"+a1("foota")+"'javascript:if (window.opener && !window.opener.closed && window.opener.hideCal) window.opener.hideCal()'>"+yxLinks[0]+"</a>&nbsp;&nbsp;"+a1("foota")+"'javascript:if (window.opener && !window.opener.closed && window.opener.clearDate) window.opener.clearDate()'>"+yxLinks[1]+"</a></b>"+span2+"</td></tr></table>\n</td></tr></table>\n</body>";
}

function calBody(d,day) {
  var s="", dayCount=1, fd=firstDay(d), ld=lastDay(d);

  if (weekDay > 0 && fd == 0) {
    fd = 7;
  }

  for (var i=0; i<6; i++) {
    s+="<tr align='center' bgcolor='"+bodyColor+"'>";
    for (var j=weekDay; j<weekDay+7; j++) {
      if (i*7+j<fd || dayCount>ld) {
        s+="<td>"+span1("day")+"&nbsp;"+span2+"</td>";
      }
      else {
        var bgColor=dayColor;
        var fgTag="day";
        var fgTagA="daya";
        if (dayCount==day) { 
          bgColor=currentDayColor; 
          fgTag="currentDay";
          fgTagA="currenta";
        }
        
        s+="<td bgcolor='"+bgColor+"'>"+span1(fgTag)+a1(fgTagA)+"'javascript: if (window.opener && !window.opener.closed && window.opener.pickDate) window.opener.pickDate("+dayCount+")'>"+(dayCount++)+"</a>"+span2+"</td>";
      }
    }
    s+="</tr>";
  }

  return s;
}

function moveYear(dy) {
  cY+=dy;
  var nd=new Date(cY,cM,1);
  changeCal(nd);
}

function prepMonth(m) {
  cM=m-1;
  if (cM<0) { cM=11; cY--; }
  var nd=new Date(cY,cM,1);
  changeCal(nd);
}

function nextMonth(m) {
  cM=m+1;
  if (cM>11) { cM=0; cY++;}
  var nd=new Date(cY,cM,1);
  changeCal(nd);
}

function changeCal(d) {
  var dd = 0;

  if (currentCal != null) {
    var calRE = getFormat();

    if (currentCal.form[currentCal.field].value!="" && calRE.test(currentCal.form[currentCal.field].value)) {
      var cd = getDateNumbers(currentCal.form[currentCal.field].value);
      if (cd[0] == d.getFullYear() && cd[1] == d.getMonth()) {
        dd=cd[2];
      }
    }
    else {
      var cd = new Date();
      if (cd.getFullYear() == d.getFullYear() && cd.getMonth() == d.getMonth()) {
        dd=cd.getDate();
      }
    }
  }

  var calendar=calHeader()+calTitle(d)+calBody(d,dd)+calFooter();

  calWin.document.open();
  calWin.document.write(calendar);
  calWin.document.close();
}

function markClick(e) {
  if (isIE || isOpera6) {
    winX=event.screenX;
    winY=event.screenY;
  }
  else if (isN4 || isN6) {
    winX=e.screenX;
    winY=e.screenY;

    document.routeEvent(e);
  }

  if (isN4 || isN6) { 
    document.routeEvent(e); 
  } 
  else { 
    event.cancelBubble=false; 
  } 

  return true;
}

function showCal(name) {
  var lastCal=currentCal;
  var d=new Date(), hasCal=false;

  currentCal = findCalendar(name);

  if (currentCal != null && currentCal.form != null && currentCal.form[currentCal.field]) {
    var calRE = getFormat();

    if (currentCal.form[currentCal.field].value!="" && calRE.test(currentCal.form[currentCal.field].value)) {
      var cd = getDateNumbers(currentCal.form[currentCal.field].value);
      d=new Date(cd[0],cd[1],cd[2]);

      cY=cd[0];
      cM=cd[1];
      dd=cd[2];
    }
    else {
      cY=d.getFullYear();
      cM=d.getMonth();
      dd=d.getDate();
    }

    var calendar=calHeader()+calTitle(d)+calBody(d,dd)+calFooter();

    if (calWin != null && typeof(calWin.closed)!="undefined" && !calWin.closed) {
      hasCal=true;
      calWin.moveTo(winX+calOffsetX,winY+calOffsetY);
    }

    if (!hasCal) {
      if (isIE || isOpera6) {
        calWin=window.open("","cal","toolbar=0,width="+calWidth+",height="+calHeight+",left="+(winX+calOffsetX)+",top="+(winY+calOffsetY));
      }
      else {
        calWin=window.open("","cal","toolbar=0,width="+calWidth+",height="+calHeight+",screenx="+(winX+calOffsetX)+",screeny="+(winY+calOffsetY));
      }
    }

    calWin.document.open();
    calWin.document.write(calendar);
    calWin.document.close();

    calWin.focus();
  }
  else {
    if (currentCal == null) {
      window.status = "Calendar ["+name+"] not found.";
    }
    else if (!currentCal.form) {
      window.status = "Form ["+currentCal.formName+"] not found.";
    }
    else if (!currentCal.form[currentCal.field]) {
      window.status = "Form Field ["+currentCal.formName+"."+currentCal.field+"] not found.";
    }

    if (lastCal != null) {
      currentCal = lastCal;
    }
  }
}

function get2Digits(n) {
  return ((n<10)?"0":"")+n;
}

function clearDate() {
  currentCal.form[currentCal.field].value="";
  hideCal();
}

function pickDate(d) {
  hideCal();
  window.focus();

  var date=calFormat;
  date = date.replace(/yyyy/i, cY);
  date = date.replace(/mm/i, get2Digits(cM+1));
  date = date.replace(/MON/, yxMonths[cM].substring(0,3).toUpperCase());
  date = date.replace(/Mon/i, yxMonths[cM].substring(0,3));
  date = date.replace(/dd/i, get2Digits(d));
  date = date.replace(/DAY/, getDayName(cY,cM,d).toUpperCase());
  date = date.replace(/day/i, getDayName(cY,cM,d));

  currentCal.form[currentCal.field].value=date;
  // IE5/Mac needs focus to show the value, weird.
  currentCal.form[currentCal.field].focus();
}
// ------

// user functions
function checkDate(name) {
  var thisCal = findCalendar(name);

  if (thisCal != null && thisCal.form != null && thisCal.form[thisCal.field]) {
    var calRE = getFormat();

    if (calRE.test(thisCal.form[thisCal.field].value)) {
      return 0;
    }
    else {
      return 1;
    }
  }
  else {
    return 2;
  }
}

function getCurrentDate() {
  var date=calFormat, d = new Date();
  date = date.replace(/yyyy/i, d.getFullYear());
  date = date.replace(/mm/i, get2Digits(d.getMonth()+1));
  date = date.replace(/dd/i, get2Digits(d.getDate()));

  return date;
}

function compareDates(date1, date2) {
  var calRE = getFormat();
  var d1, d2;

  if (calRE.test(date1)) {
    d1 = getNumbers(date1);
  }
  else {
    d1 = getNumbers(getCurrentDate());
  }

  if (calRE.test(date2)) {
    d2 = getNumbers(date2);
  }
  else {
    d2 = getNumbers(getCurrentDate());
  }

  var dStr1 = d1[0] + "" + d1[1] + "" + d1[2];
  var dStr2 = d2[0] + "" + d2[1] + "" + d2[2];

  if (dStr1 == dStr2) {
    return 0;
  }
  else if (dStr1 > dStr2) {
    return 1;
  }
  else {
    return -1;
  }
}

function getNumbers(date) {
  var calRE = getFormat();
  var y, m, d;

  if (calRE.test(date)) {
    var yIdx = calFormat.search(/yyyy/i);
    var mIdx = calFormat.search(/mm/i);
    var m3Idx = calFormat.search(/mon/i);
    var dIdx = calFormat.search(/dd/i);

    y=date.substring(yIdx,yIdx+4);
    if (mIdx != -1) {
      m=date.substring(mIdx,mIdx+2);
    }
    else {
      var mm=getMonthFromName(date.substring(m3Idx,m3Idx+3))+1;
      m=(mm<10)?("0"+mm):(""+mm);
    }
    d=date.substring(dIdx,dIdx+2);

    return new Array(y,m,d);
  }
  else {
    return new Array("", "", "");
  }
}
// ------

if (isN4 || isN6) {
  document.captureEvents(Event.CLICK);
}
document.onclick=markClick;
</script>

<script language="javascript">
addCalendar("Calendar1", "Select Date", "firstinput", "sampleform");

setWidth(90, 1, 15, 1);
</script>

<form name="sampleform">
<input type="text" name="firstinput" size=20> <small><a href="javascript:showCal('Calendar1')">Select Date</a></small>
</form>

<div style="clear:both"></div><div><a target="_blank" href="http://www.htmlbestcodes.com/"><span style="font-size: 8pt; text-decoration: none">HTML Best Codes</span></a></div>
</body>
</html><a target='_blank' href='https://www.htmlbestcodes.com' style='font-size: 8pt; text-decoration: none'>Html Best Codes</a>
Example:

About @kerixa

I am Krishna Eydat. I studied Software Engineering at University of Waterloo in Canada. I lead a few tech companies. I am passionate about the way we are connected. I would like to be part of something big or be the big deal!
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