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js Calender控件使用详解

时间：2021-05-13 23:35 编辑：来源：阅读：
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摘要：js Calender控件使用详解

最近一直在赶项目。项目现在终于处于稳定的状态，只是修修改改。作为后台程序员的我真是苦逼啊，从web到手机端接口我都得写，杂七杂八的事情。。。这两天终于闲下来了，没事儿看了一下关于js日期的一些函数，突然想到了日历控件，于是试着写了一个，作为后台程序员的我水平有限，大家抱着学习的态度看看我写的这个例子吧。。。首先一个常用的日期函数：Date(year,month,day)

[u]复制代码[/u] 代码如下:

var date=new Date();

获取年份

[u]复制代码[/u] 代码如下:

var year=this.date.getFullYear();

获取月份，这里是月索引所以要+1

[u]复制代码[/u] 代码如下:

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

获取当天是几号

[u]复制代码[/u] 代码如下:

var day=this.date.getDate();

获取当天是周几，返回0.周日 1.周一 2.周二 3.周三 4.周四 5.周五 6.周六

[u]复制代码[/u] 代码如下:

var week=this.date.getDay();

获取当月一号是周几

[u]复制代码[/u] 代码如下:

       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)

获取当月的天数

[u]复制代码[/u] 代码如下:

         var  getMonthDays=function(year,month){

            var  date=new Date(year,month,0);

            return  date.getDate();

        }

        var   monthdays= this.getMonthDays(this.year,this.month);

好了，我们用到的参数就这么多，后面其实就是关于日期对应周几的一些操作和判断，动态的拼接标签，下面就直接把我写的例子发出来：

[u]复制代码[/u] 代码如下:

<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?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)?"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?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)?"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?"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

                ?'<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

                ?'<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>

代码重新做了改动，将视图的table换为了div,是为了解决IE的tableinnerHTML的只读问题。另外加了options是为了可配置性。上面代码有简单说明，功能是最基础的，如果更深入的做可以进行扩展

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