js日历控件

document.write("<div id='meizzCalendarLayer' style='POSITION: absolute; z-index: 9999; 144px; height: 210px; display: none'>");
document.write("<iframe name=meizzCalendarIframe scrolling=no frameborder=0 width=100% height=100%></iframe></div>");
function document.onclick()
{
if(WebCalendar.eventSrc != window.event.srcElement) hiddenCalendar();
}

var WebCalendar = new WebCalendar();
function WebCalendar() //初始化日历的设置
{
      this.regInfo      = "梅花雨日历控件3.1(修正：水边) 关闭的快捷键：[Esc]";

      this.dayShow      = 38;                         //定义页面上要显示的天数,不能小于35,或大于39
      this.daysMonth    = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);//定义1~12月的天数
      this.day          = new Array(this.dayShow);    //定义日历展示用的数组
      this.dayObj       = new Array(this.dayShow);    //定义日期展示控件数组
      this.dateStyle    = null;                       //保存格式化后日期数组
      this.objExport    = null;                       //日历回传的显示控件
      this.eventSrc     = null;                       //日历显示的触发控件
      this.inputDate    = null;                       //转化外的输入的日期(d/m/yyyy)
      this.thisYear     = new Date().getFullYear(); //定义年的变量的初始值
      this.thisMonth    = new Date().getMonth()+ 1; //定义月的变量的初始值
      this.thisDay      = new Date().getDate();       //定义日的变量的初始值
      this.today        = this.thisDay +"/"+ this.thisMonth +"/"+ this.thisYear;     //今天(d/m/yyyy)
      this.iframe       = window.frames("meizzCalendarIframe"); //日历的 iframe 载体
      this.calendar     = getObjectById("meizzCalendarLayer");    //日历的层
      this.dateReg      = "";             //日历格式验证的正则式

      this.yearFall     = 50;             //定义显示的年份下拉框的年差值，如果今年是2000年，这里设置为50，就显示1950－2050
      this.format       = "yyyy-mm-dd"; //回传日期的格式
      this.timeShow     = false;          //是否返回时间
      this.drag         = true;           //是否允许拖动
      this.darkColor    = "#95B7F3";      //控件的暗色
      this.lightColor = "#FFFFFF";      //控件的亮色
      this.btnBgColor = "#E6E6FA";      //控件的按钮背景色
      this.wordColor    = "#000080";      //控件的文字颜色
      this.wordDark     = "#DCDCDC";      //控件的暗文字颜色
      this.dayBgColor = "#F5F5FA";      //日期数字背景色
      this.todayColor = "#FF0000";      //今天在日历上的标示背景色
      this.DarkBorder = "#D4D0C8";      //日期显示的立体表达色
}

      if (WebCalendar.drag){ strIframe += "<scr"+"ipt language=javascript>"+
      "var drag=false, cx=0, cy=0, o = parent.WebCalendar.calendar; function document.onmousemove(){"+
      "if(parent.WebCalendar.drag && drag){if(o.style.left=='')o.style.left=0; if(o.style.top=='')o.style.top=0;"+
      "o.style.left = parseInt(o.style.left) + window.event.clientX-cx;"+
      "o.style.top    = parseInt(o.style.top)    + window.event.clientY-cy;}}"+
      "function document.onkeydown(){ switch(window.event.keyCode){    case 27 : parent.hiddenCalendar(); break;"+
      "case 37 : parent.prevM(); break; case 38 : parent.prevY(); break; case 39 : parent.nextM(); break; case 40 : parent.nextY(); break;"+
      "case 84 : document.forms[0].today.click(); break;} window.event.keyCode = 0; window.event.returnValue= false;}"+
      "function dragStart(){cx=window.event.clientX; cy=window.event.clientY; drag=true;}</scr"+"ipt>"}

      strIframe += "<select name=tmpYearSelect    onblur='parent.hiddenSelect(this)' style='z-index:1;position:absolute;top:3;left:18;display:none'"+
      " onchange='parent.WebCalendar.thisYear =this.value; parent.hiddenSelect(this); parent.writeCalendar();'></select>"+
      "<select name=tmpMonthSelect onblur='parent.hiddenSelect(this)' style='z-index:1; position:absolute;top:3;left:74;display:none'"+
      " onchange='parent.WebCalendar.thisMonth=this.value; parent.hiddenSelect(this); parent.writeCalendar();'></select>"+

      "<table id=tableMain class=bg border=0 cellspacing=2 cellpadding=0>"+
      "<tr><td width=140 height=19 bgcolor='"+ WebCalendar.lightColor +"'>"+
      "      <table width=140 id=tableHead border=0 cellspacing=1 cellpadding=0><tr align=center>"+
      "      <td width=15 height=19 class=bg title='向前翻 1 月快捷键：←' style='cursor: hand' onclick='parent.prevM()'><b><</b></td>"+
      "      <td width=60 id=meizzYearHead    title='点击此处选择年份' onclick='parent.funYearSelect(parseInt(this.innerText, 10))'"+
      "          onmouseover='this.bgColor=parent.WebCalendar.darkColor; this.style.color=parent.WebCalendar.lightColor'"+
      "          onmouseout='this.bgColor=parent.WebCalendar.lightColor; this.style.color=parent.WebCalendar.wordColor'></td>"+
      "      <td width=50 id=meizzYearMonth title='点击此处选择月份' onclick='parent.funMonthSelect(parseInt(this.innerText, 10))'"+
      "          onmouseover='this.bgColor=parent.WebCalendar.darkColor; this.style.color=parent.WebCalendar.lightColor'"+
      "          onmouseout='this.bgColor=parent.WebCalendar.lightColor; this.style.color=parent.WebCalendar.wordColor'></td>"+
      "      <td width=15 class=bg title='向后翻 1 月快捷键：→' onclick='parent.nextM()' style='cursor: hand'><b>></b></td></tr></table>"+
      "</td></tr><tr><td height=20><table id=tableWeek border=1 width=140 cellpadding=0 cellspacing=0 ";
      if(WebCalendar.drag){strIframe += "onmousedown='dragStart()' onmouseup='drag=false' onmouseout='drag=false'";}
      strIframe += " borderColorLight='"+ WebCalendar.darkColor +"' borderColorDark='"+ WebCalendar.lightColor +"'>"+
      "      <tr align=center><td height=20>日</td><td>一</td><td>二</td><td>三</td><td>四</td><td>五</td><td>六</td></tr></table>"+
      "</td></tr><tr><td valign=top width=140 bgcolor='"+ WebCalendar.lightColor +"'>"+
      "      <table id=tableDay height=120 width=140 border=0 cellspacing=1 cellpadding=0>";
           for(var x=0; x<5; x++){
             strIframe += "<tr>";
             for(var y=0; y<7; y++)
               strIframe += "<td class=out id='meizzDay"+ (x*7+y) +"'></td>";
             strIframe += "</tr>";
           }
           strIframe += "<tr>";
           for(var x=35; x<WebCalendar.dayShow; x++)
             strIframe += "<td class=out id='meizzDay"+ x +"'></td>";
           strIframe +="<td colspan="+(42-WebCalendar.dayShow).toString()+" class=out style='text-align:center;' title='"+ WebCalendar.regInfo +"'>" +
           "<input style=' background-color: " + WebCalendar.btnBgColor +";cursor: hand; padding-top: 2px; 44%; height: 100%;' onfocus='this.blur()'"+
           " type=button value='清空' onclick='parent.WebCalendar.objExport.value=\"\";parent.hiddenCalendar()'>" +
           " " +
           "<input style=' background-color: " + WebCalendar.btnBgColor +";cursor: hand; padding-top: 2px; 44%; height: 100%;' onfocus='this.blur()'"+
           " type=button value='关闭' onclick='parent.hiddenCalendar()'>" +
           "</td></tr></table>"+
      "</td></tr><tr><td height=20 width=140 bgcolor='"+ WebCalendar.lightColor +"'>"+
      "      <table border=0 cellpadding=1 cellspacing=0 width=140>"+
      "      <tr><td><input name=prevYear title='向前翻 1 年快捷键：↑' onclick='parent.prevY()' type=button value='<<'"+
      "      onfocus='this.blur()' style='meizz:expression(this.disabled=parent.WebCalendar.thisYear==1000)'><input"+
      "      onfocus='this.blur()' name=prevMonth title='向前翻 1 月快捷键：←' onclick='parent.prevM()' type=button value='< '>"+
      "      </td><td align=center><input name=today type=button value='Today' onfocus='this.blur()' style=' 50' title='当前日期快捷键：T'"+
      "      onclick=\"parent.returnDate(new Date().getDate() +'/'+ (new Date().getMonth() +1) +'/'+ new Date().getFullYear())\">"+
      "      </td><td align=right><input title='向后翻 1 月快捷键：→' name=nextMonth onclick='parent.nextM()' type=button value=' >'"+
      "      onfocus='this.blur()'><input name=nextYear title='向后翻 1 年快捷键：↓' onclick='parent.nextY()' type=button value='>>'"+
      "      onfocus='this.blur()' style='meizz:expression(this.disabled=parent.WebCalendar.thisYear==9999)'></td></tr></table>"+
      "</td></tr><table></form></body></html>";
      with(WebCalendar.iframe)
      {
          document.writeln(strIframe); document.close();
          for(var i=0; i<WebCalendar.dayShow; i++)
          {
              WebCalendar.dayObj[i] = eval("meizzDay"+ i);
              WebCalendar.dayObj[i].onmouseover = dayMouseOver;
              WebCalendar.dayObj[i].onmouseout    = dayMouseOut;
              WebCalendar.dayObj[i].onclick       = returnDate;
          }
      }
}

function calendar() //主调函数
{
      var e = window.event.srcElement;     writeIframe();
      var o = WebCalendar.calendar.style; WebCalendar.eventSrc = e;
if (arguments.length == 0) WebCalendar.objExport = e;
      else WebCalendar.objExport = eval(arguments[0]);

      WebCalendar.iframe.tableWeek.style.cursor = WebCalendar.drag ? "move" : "default";
var t = e.offsetTop,    h = e.clientHeight, l = e.offsetLeft, p = e.type;
while (e = e.offsetParent){t += e.offsetTop; l += e.offsetLeft;}
      o.display = ""; WebCalendar.iframe.document.body.focus();
      var cw = WebCalendar.calendar.clientWidth, ch = WebCalendar.calendar.clientHeight;
      var dw = document.body.clientWidth, dl = document.body.scrollLeft, dt = document.body.scrollTop;

      if (document.body.clientHeight + dt - t - h >= ch) o.top = (p=="image")? t + h : t + h + 6;
      else o.top    = (t - dt < ch) ? ((p=="image")? t + h : t + h + 6) : t - ch;
      if (dw + dl - l >= cw) o.left = l; else o.left = (dw >= cw) ? dw - cw + dl : dl;

if (!WebCalendar.timeShow) WebCalendar.dateReg = /^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/;
else WebCalendar.dateReg = /^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})$/;

      try{
          if (WebCalendar.objExport.value.trim() != ""){
              WebCalendar.dateStyle = WebCalendar.objExport.value.trim().match(WebCalendar.dateReg);
              if (WebCalendar.dateStyle == null)
              {
                  WebCalendar.thisYear     = new Date().getFullYear();
                  WebCalendar.thisMonth    = new Date().getMonth()+ 1;
                  WebCalendar.thisDay      = new Date().getDate();
                  alert("原文本框里的日期有错误！\n可能与你定义的显示时分秒有冲突！");
                  writeCalendar(); return false;
              }
              else
              {
                  WebCalendar.thisYear     = parseInt(WebCalendar.dateStyle[1], 10);
                  WebCalendar.thisMonth    = parseInt(WebCalendar.dateStyle[3], 10);
                  WebCalendar.thisDay      = parseInt(WebCalendar.dateStyle[4], 10);
                  WebCalendar.inputDate    = parseInt(WebCalendar.thisDay, 10) +"/"+ parseInt(WebCalendar.thisMonth, 10) +"/"+
                  parseInt(WebCalendar.thisYear, 10); writeCalendar();
              }
          }    else writeCalendar();
      }    catch(e){writeCalendar();}
}

function funMonthSelect() //月份的下拉框
{
      var m = isNaN(parseInt(WebCalendar.thisMonth, 10)) ? new Date().getMonth() + 1 : parseInt(WebCalendar.thisMonth);
      var e = WebCalendar.iframe.document.forms[0].tmpMonthSelect;
      for (var i=1; i<13; i++) e.options.add(new Option(i +"月", i));
      e.style.display = ""; e.value = m; e.focus(); window.status = e.style.top;
}

function funYearSelect() //年份的下拉框
{
      var n = WebCalendar.yearFall;
      var e = WebCalendar.iframe.document.forms[0].tmpYearSelect;
      var y = isNaN(parseInt(WebCalendar.thisYear, 10)) ? new Date().getFullYear() : parseInt(WebCalendar.thisYear);
          y = (y <= 1000)? 1000 : ((y >= 9999)? 9999 : y);
      var min = (y - n >= 1000) ? y - n : 1000;
      var max = (y + n <= 9999) ? y + n : 9999;
          min = (max == 9999) ? max-n*2 : min;
          max = (min == 1000) ? min+n*2 : max;
      for (var i=min; i<=max; i++) e.options.add(new Option(i +"年", i));
      e.style.display = ""; e.value = y; e.focus();
}

function prevM()    //往前翻月份
{
      WebCalendar.thisDay = 1;
      if (WebCalendar.thisMonth==1)
      {
          WebCalendar.thisYear--;
          WebCalendar.thisMonth=13;
      }
      WebCalendar.thisMonth--; writeCalendar();
}

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原文地址：https://www.cnblogs.com/sgy2008/p/1243966.html