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Learn to write js Calender calendar control together_javascript skills

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May 16, 2016 pm 03:05 PM

jscalendar control

I recently looked at some functions about js date, and suddenly thought of the calendar control, so I tried to write one. As a background programmer, my level is limited. Please take a look at this example I wrote with a learning attitude. , learn and progress together!

First a commonly used date function:

Date(year,month,day)

var date=new Date();

Get the year

var year=this.date.getFullYear();

Get the month, here is the month index so +1

var month=this.date.getMonth()+1;

Get the date of the day

var day=this.date.getDate();

Get the day of the week and return 0.Sunday 1.Monday 2.Tuesday 3.Wednesday 4.Thursday 5.Friday 6.Saturday

var week=this.date.getDay();

Get the day of the week the first of the month is

 var   getWeekDay=function(year,month,day){
      var date=new Date(year,month,day);
      return date.getDay();
      }

　　　var  weekstart= getWeekDay(this.year, this.month-1, 1)

Get the number of days in the current month

var getMonthDays=function(year,month){
      var date=new Date(year,month,0);
      return date.getDate();
    }
var  monthdays= this.getMonthDays(this.year,this.month);

Okay, there are so many parameters we use. What follows is actually some operations and judgments about the date corresponding to the day of the week, and dynamic splicing tags. Let’s just post the example I wrote:

Rendering:

<html>  
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<head>
  <style type="text/css">

td{ text-align: center;}
  </style>
  <script type="text/javascript">
   
window.onload=function(){
  var  Calender=function(){
    this.Init.apply(this,arguments);
  }
  Calender.prototype={
    Init:function(container,options){
      this.date=new Date();
      this.year=this.date.getFullYear();
      this.month=this.date.getMonth()+1;
      this.day=this.date.getDate();
      this.week=this.date.getDay();
      this.weekstart=this.getWeekDay(this.year, this.month-1, 1);
      this.monthdays= this.getMonthDays(this.year,this.month);
      this.containerDiv=document.getElementById(container);
      this.options=options!=null&#63;options:{
        border:'1px solid green',
        width:'400px',
        height:'200px',
        backgroundColor:'lightgrey',
        fontColor:'blue'
      }
    },
    getMonthDays:function(year,month){
      var date=new Date(year,month,0);
      return date.getDate();
    },
    getWeekDay:function(year,month,day){
      var date=new Date(year,month,day);
      return date.getDay();
    },
    View:function(){
      var tablestr='<table>';
       tablestr+='<tr><td colspan="3"></td><td>年:'+this.year+'</td><td colspan="3">月：'+this.month+'</td></tr>';
      tablestr+='<tr><td width="14%">日</td><td width="14%">一</td><td width="14%">二</td><td width="14%">三</td><td width="14%">四</td><td width="14%">五</td><td width="14%">六</td></tr>';
      var index=1;
      //判断每月的第一天在哪个位置
      var style='';
      if(this.weekstart<7)
      {
        tablestr+='<tr>';
         for (var i = 0; i <this.weekstart; i++) {
           tablestr+='<td></td>';
         };
         for (var i = 0; i < 7-this.weekstart; i++) {
          style=this.day==(i+1)&#63;"background-Color:green;":"";
           index++;
           tablestr+='<td style="'+style+'" val='+(this.year+'-'+this.month+'-'+(i+1))+'>'+(i+1)+'</td>';
         };
        tablestr+='</tr>';

      }
      ///剩余天数对应的位置

      //判断整数行并且对应相应的位置
      var remaindays=this.monthdays-(7-this.weekstart);
      var row=Math.floor(remaindays%7==0&#63;remaindays/7:((remaindays/7)+1)) ;
      var  count=Math.floor(remaindays/7);
      for (var i = 0; i < count; i++) {
         tablestr+='<tr>';
         for (var k = 0; k < 7; k++) {
           style=this.day==(index+k)&#63;"background-Color:green;":"";
           tablestr+='<td style="'+style+'" val='+(this.year+'-'+this.month+'-'+(index+k))+'>';
           tablestr+=index+k;
           tablestr+='</td>';
         };
         tablestr+='</tr>';
         index+=7;
      };

      //最后剩余的天数对应的位置(不能填充一周的那几天)
      var remaincols=this.monthdays-(index-1);
      tablestr+='<tr>';
      for (var i = 0; i < remaincols; i++) {
        style=this.day==index&#63;"background-Color:green;":"";
        tablestr+='<td style="'+style+'" val='+(this.year+'-'+this.month+'-'+(index))+'>';
        tablestr+=index;
        tablestr+='</td>';
        index++;
      };
      tablestr+='</tr>';
      tablestr+='</table>';
      return tablestr;
    },
    Render:function(){
      var calenderDiv=document.createElement('div');
      calenderDiv.style.border=this.options.border;
      calenderDiv.style.width=this.options.width;
      calenderDiv.style.height=this.options.height;
      calenderDiv.style.cursor='pointer';
      calenderDiv.style.backgroundColor=this.options.backgroundColor;
      // calenderDiv.style.color=this.options.fontColor;
      calenderDiv.style.color='red' ;

      calenderDiv.onclick=function(e){
        var evt=e||window.event;
        var  target=evt.srcElement||evt.target;

        if(target&&target.getAttribute('val'))
        {

          alert(target.getAttribute('val'));
        }
      
      }
      var tablestr=this.View();
      this.tablestr=tablestr;
      calenderDiv.innerHTML=tablestr;
      var div=document.createElement('div');
      div.style.width='auto';
      div.style.height='auto';
       div.appendChild(calenderDiv);

       ///翻页div
      var pagerDiv=document.createElement('div');
      pagerDiv.style.width='auto';
      pagerDiv.style.height='auto';

        var that=this;


        ///重新设置参数
      var  resetPara=function(year,month,day){
          that.date=new Date(year,month,day);
          that.year=that.date.getFullYear();
          that.month=that.date.getMonth()+1;
          that.day=that.date.getDate();
          that.week=that.date.getDay();
          that.weekstart=that.getWeekDay(that.year, that.month-1, 1);
          that.monthdays= that.getMonthDays(that.year,that.month);
      }

      //上一页
      var preBtn=document.createElement('input');
       preBtn.type='button';
       preBtn.value='<';

       preBtn.onclick=function(){
           that.containerDiv.removeChild(div);
           resetPara(that.year,that.month-2,that.day);
           that.Render();

       }
       //下一页
       var nextBtn=document.createElement('input');
       nextBtn.type='button';
       nextBtn.value='>';
     
       nextBtn.onclick=function(){
           that.containerDiv.removeChild(div);
           resetPara(that.year,that.month,that.day);
           that.Render();

       }

       pagerDiv.appendChild(preBtn);
       pagerDiv.appendChild(nextBtn);
       div.appendChild(pagerDiv);

       var dropDiv=document.createElement('div');
       var  dropdivstr='';
       //选择年份
       dropdivstr+='<select id="ddlYear">';
       for (var i = 1900; i <= 2100; i++) {
        dropdivstr+= 
        i==that.year
        &#63;'<option value="'+i+'" selected="true">'+i+'</option>'
        : '<option value="'+i+'">'+i+'</option>';
       };
       dropdivstr+='</select>';
      
      //选择月份
      dropdivstr+='<select id="ddlMonth">';
       for (var i = 1; i <= 12; i++) {
        dropdivstr+=
        i==that.month
        &#63;'<option value="'+i+'" selected="true">'+i+'</option>'
        : '<option value="'+i+'">'+i+'</option>';
       };
       dropdivstr+='</select>';
       dropDiv.innerHTML=dropdivstr;
       div.appendChild(dropDiv);
      that.containerDiv.appendChild(div);
  

       ///绑定选择年份和月份的事件
       var ddlChange=function(){
           var ddlYear=document.getElementById('ddlYear');
          var ddlMonth=document.getElementById('ddlMonth');
          var  yearIndex=ddlYear.selectedIndex;
          var year=ddlYear.options[yearIndex].value;
          var  monthIndex=ddlMonth.selectedIndex;
          var month=ddlMonth.options[monthIndex].value;
          that.containerDiv.removeChild(div);
          resetPara(year,month-1,that.day);
          that.Render();
       }

      ddlYear.onchange=function(){
         ddlChange();
      }

       ddlMonth.onchange=function(){
         ddlChange();
        
      }
    }

  }


  var  calender=new Calender('dvTest',{
        border:'1px solid green',
        width:'400px',
        height:'200px',
        backgroundColor:''
        }
        );
  calender.Render();
 
}
  </script>
 
 
</head>
<body>
 <div id="dvTest"></div>
</body>
</html>

The code has been changed again, replacing the table of the view with a div, in order to solve the read-only problem of IE's tableinnerHTML. In addition, options are added for configurability.
The above code has a simple explanation. The function is the most basic. If you do it more in-depth, it can be expanded. I hope this article can give you some inspiration.

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