Sharing examples of making calendar controls using native js-JS Tutorial-php.cn

The example of this article shares with you a simple calendar control implemented in js for your reference. The specific content is as follows
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Sharing examples of making calendar controls using native js
Specific code :
<!DOCTYPE html>
<html>
<head>
 <meta charset="utf-8">
 <title>date</title>
 <style type="text/css">
 *{ margin:0; padding:0;}
 a{ text-decoration:none; outline:none;}
 body a{outline:none;blr:expression(this.onFocus=this.blur());}
 img{ border:none;}
 ul{ list-style:none;}
 body{ color:#666666; font-size:14px; font-family:"微软雅黑"; background-color:#fff; height:100%; overflow-y:scroll;*overflow-y:inherit;}
 /*html{ height:100%;}*/
 .clearfix:after{ content:"."; display:block; height:0; clear:both; overflow:hidden;}
 .clearfix{ zoom:1;}
  
  
 #box{width:350px; position:absolute;}
 #title{width:350px; height:50px;}
 #month{ float:left;width:60px; height:50px;text-align:center;cursor:pointer;line-height:50px;}
 #year{float:left;width:80px; height:50px;text-align:center;cursor:pointer;line-height:50px;}
 #week{ width:350px;height:50px;}
 #week div{ float:left; width:48px; height:48px; margin:1px; background:#C90; color:#fff; text-align:center; line-height:48px; cursor:pointer;}
 #con{ width:350px;}
 #con div{ float:left; width:48px; height:48px; margin:1px; background:#CCC; color:#333; text-align:center; line-height:48px; cursor:pointer;}
 #con .edate{background:#999;}
 #con .edate:hover{background:#09F; color:#fff;}
 #con div.now{background:#09F; color:#fff;}
   
 #prevmonth,#nextmonth,#prevyear,#nextyear{float:left;width:50px; height:50px;text-align:center;cursor:pointer;line-height:50px;}
   
 #btns{width:350px; height:40px;}
 #nowtime{ float:left; margin:5px; height:30px; line-height:30px; padding:0 5px; background:#09F; cursor:pointer; border-radius:5px;}
 #nowtime:hover{background:#ddd;}
 #cleartime{float:left; margin:5px; height:30px; line-height:30px; padding:0 5px; background:#09F; cursor:pointer; border-radius:5px;}
 </style>
</head>
<body>
 <p style=" margin:100px;">选择日期：<input type="text" id="date" value="" style="height:40px; line-height:40px;"/></p>
   
   
</body>
<script type="text/javascript">
window.onload=function(){ 
  
  
  
 //创建日历控件基本结构 
 var obody=document.body;
 createbox();
 function createbox(){
    
  var ddbox=document.createElement("div");
  ddbox.id="box";
  ddbox.style.display="none";
  var str="";
  str+=&#39;<div id="title"><div id="prevyear"><<</div><div id="prevmonth"><</div><div id="month"></div><div id="year"></div><div id="nextmonth">></div><div id="nextyear">>></div></div>&#39;;
  str+=&#39;<div id="week"><div>日</div><div>一</div><div>二</div><div>三</div><div>四</div><div>五</div><div>六</div></div>&#39;;
  str+=&#39;<div id="con" class="clearfix"></div>&#39;;
  str+=&#39;<div id="btns"><div id="nowtime">当前时间</div><div id="cleartime">清空</div></div>&#39;;
  ddbox.innerHTML=str;
  obody.appendChild(ddbox);   
 };
 //===================get ele=============================== 
 var omonth=document.getElementById("month");
 var oyear=document.getElementById("year");
 var con=document.getElementById("con");
 var prevmonth=document.getElementById("prevmonth");
 var nextmonth=document.getElementById("nextmonth");
 var prevyear=document.getElementById("prevyear");
 var nextyear=document.getElementById("nextyear");
 var nowtime=document.getElementById("nowtime");
 var date=document.getElementById("date");
 var box=document.getElementById("box");
 var cleartime=document.getElementById("cleartime");
 //===================show date===============================
 date.onfocus=function(){//显示控件
  var datel=this.getBoundingClientRect().left;
  var datet=this.getBoundingClientRect().top+40;
  box.style.left=datel+"px";
  box.style.top=datet+"px";
  box.style.display="block";
 }; 
 con.onclick=function(event){
  if(event.target.tagName=="DIV" && event.target.nodeType=="1" && hasclass(event.target.className,"edate")){
   date.value="";
   date.value=dateObj.getFullYear()+"-"+toyear(dateObj)+"-"+event.target.innerHTML;
   box.style.display="none";
  };
 };
 cleartime.onclick=function(event){
  date.value="";
 };
 //===================set year month===============================
 //默认时间对象
 var dateObj = new Date();
 //动态控制
 prevmonth.onclick=function(){//上一月
  var ddm=null;
  var ddy=null;
  if((dateObj.getMonth()-1)==-1){
   ddm=11;
   ddy=dateObj.getFullYear()-1;
  }else{
   ddm=dateObj.getMonth()-1;
   ddy=dateObj.getFullYear();
  };
  dateObj.setFullYear(ddy);
  dateObj.setMonth(ddm);
  omonth.innerHTML=toyear(dateObj)+"月";
  oyear.innerHTML=dateObj.getFullYear()+"年";
  remove();
  oneweek=oneyearoneday(dateObj);
  alld=alldays(dateObj);
  nowd=nowday(dateObj);
  init(oneweek,alld,nowd);
 };
 nextmonth.onclick=function(){//下一月
  var ddm=null;
  var ddy=null;
  if((dateObj.getMonth()+1)==12){
   ddm=0;
   ddy=dateObj.getFullYear()+1;
  }else{
   ddm=dateObj.getMonth()+1;
   ddy=dateObj.getFullYear();
  };
  dateObj.setFullYear(ddy);
  dateObj.setMonth(ddm);
  omonth.innerHTML=toyear(dateObj)+"月";
  oyear.innerHTML=dateObj.getFullYear()+"年";
  remove();
  oneweek=oneyearoneday(dateObj);
  alld=alldays(dateObj);
  nowd=nowday(dateObj);
  init(oneweek,alld,nowd);  
 };
 prevyear.onclick=function(){//上一年
  var ddy=dateObj.getFullYear()-1;
  dateObj.setFullYear(ddy);
  oyear.innerHTML=dateObj.getFullYear()+"年";
  remove();
  oneweek=oneyearoneday(dateObj);
  alld=alldays(dateObj);
  nowd=nowday(dateObj);
  init(oneweek,alld,nowd);
 };
 nextyear.onclick=function(){//下一年
  var ddy=dateObj.getFullYear()+1;
  dateObj.setFullYear(ddy);
  oyear.innerHTML=dateObj.getFullYear()+"年";
  remove();
  oneweek=oneyearoneday(dateObj);
  alld=alldays(dateObj);
  nowd=nowday(dateObj);
  init(oneweek,alld,nowd);  
 }; 
 //返回到今时今日
 nowtime.onclick=function(){
  var dddate=new Date();
  var ddm=dddate.getMonth();
  var ddy=dddate.getFullYear();
  dateObj.setFullYear(ddy);
  dateObj.setMonth(ddm);
  omonth.innerHTML=toyear(dateObj)+"月";
  oyear.innerHTML=dateObj.getFullYear()+"年";
  remove();
  oneweek=oneyearoneday(dateObj);
  alld=alldays(dateObj);
  nowd=nowday(dateObj);
  init(oneweek,alld,nowd);  
 };
 //年月获取 
 var year=dateObj.getFullYear();
 var month=toyear(dateObj);//0是12月
 //月年的显示
 omonth.innerHTML=month+"月";
 oyear.innerHTML=year+"年";
 //===================set day===============================
  
 //获取本月1号的周值
 var oneweek=oneyearoneday(dateObj);
 //本月总日数
 var alld=alldays(dateObj);
 //当前是几
 var nowd=nowday(dateObj);
 //初始化显示本月信息
 init(oneweek,alld,nowd);
   
 //===================function===============================
 //有无指定类名的判断
 function hasclass(str,cla){
  var i=str.search(cla);
  if(i==-1){
   return false;
  }else{
   return true;
  };
 };
 //初始化日期显示方法
 function remove(){
  con.innerHTML="";
 };
 function init(oneweek,alld,nowd){
  for(var i=1;i<=oneweek;i++){//留空
   var eday=document.createElement("div");
   eday.innerHTML="";
   con.appendChild(eday);
  };
  for(var i=1;i<=alld;i++){//正常区域
   var eday=document.createElement("div");
   if(i==nowd){     
    eday.innerHTML=i;
    eday.className="now edate";
    con.appendChild(eday);
   }else{
    eday.innerHTML=i;
    eday.className="edate";
    con.appendChild(eday);
   };
  };
 };
 //获取本月1号的周值
 function oneyearoneday(dateObj){
  var oneyear = new Date();
  var year=dateObj.getFullYear();
  var month=dateObj.getMonth();//0是12月
  oneyear.setFullYear(year);
  oneyear.setMonth(month);//0是12月
  oneyear.setDate(1);
  return oneyear.getDay();  
 };
 //当前是几
 function nowday(dateObj){
  return dateObj.getDate();
 };
 //获取本月总日数方法
 function alldays(dateObj){
  var year=dateObj.getFullYear();
  var month=dateObj.getMonth();
  if(isLeapYear(year)){//闰年
   switch(month) { 
   case 0: return "31"; break; 
   case 1: return "29"; break; //2月
   case 2: return "31"; break; 
   case 3: return "30"; break; 
   case 4: return "31"; break; 
   case 5: return "30"; break; 
   case 6: return "31"; break; 
   case 7: return "31"; break; 
   case 8: return "30"; break; 
   case 9: return "31"; break; 
   case 10: return "30"; break; 
   case 11: return "31"; break;   
   default:  
   };
  }else{//平年
   switch(month) { 
   case 0: return "31"; break; 
   case 1: return "28"; break; //2月 
   case 2: return "31"; break; 
   case 3: return "30"; break; 
   case 4: return "31"; break; 
   case 5: return "30"; break; 
   case 6: return "31"; break; 
   case 7: return "31"; break; 
   case 8: return "30"; break; 
   case 9: return "31"; break; 
   case 10: return "30"; break; 
   case 11: return "31"; break;   
   default:  
   };   
  };
 };
 //闰年判断函数
 function isLeapYear(year){ 
  if( (year % 4 == 0) && (year % 100 != 0 || year % 400 == 0)){
   return true;
  }else{
   return false;
  }; 
 };
 //月份转化方法
 function toyear(dateObj){ 
  var month=dateObj.getMonth()
  switch(month) { 
  case 0: return "1"; break; 
  case 1: return "2"; break; 
  case 2: return "3"; break; 
  case 3: return "4"; break; 
  case 4: return "5"; break; 
  case 5: return "6"; break; 
  case 6: return "7"; break; 
  case 7: return "8"; break; 
  case 8: return "9"; break; 
  case 9: return "10"; break; 
  case 10: return "11"; break; 
  case 11: return "12"; break;   
  default: 
  }; 
 };
};
</script>
</html>
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I hope this article will be helpful to everyone learning javascript programming.
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