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ASP.NET笔记之Calender的使用说明

程序员文章站 2024-03-03 18:02:40
1、介绍 (1、在calender中,所有可选择的符号会显示下划线,这是因为它们在浏览器都会呈现为链接。      如...

1、介绍

(1、在calender中,所有可选择的符号会显示下划线,这是因为它们在浏览器都会呈现为链接。

     如果让用户可以选择某天、月、周,必须设置selectionmode属性(day、 dayweek、dayweekmonth)

                            ASP.NET笔记之Calender的使用说明

 

(2   控件事件  当用户选择了某一天或者月,可以用onselectionchanged来触发

     通过  calendar1.selecteddate.toshortdatestring();来获取所选择的时间点
     通过  calendar1.selecteddate.count.tostring();来获取所选择的天数

2、实例

现在通过一个实例来加深对日历控件的理解:

当点击tgif时,会在日历上显示所选月份的所有星期五

当点击apply时,会在日历上显示开始到结束的日期

                    ASP.NET笔记之Calender的使用说明

 calender.aspx.cs

复制代码 代码如下:

using system;
 using system.collections.generic;
 using system.linq;
 using system.web;
 using system.web.ui;
 using system.web.ui.webcontrols;

 public partial class mytest_calender : system.web.ui.page
 {
     protected void page_load(object sender, eventargs e)
     {
         if (!ispostback) {
             my_calendar.visibledate = my_calendar.todaysdate;
             //将选择的日期中的月份映射到下拉框中
             month_list.selectedindex = my_calendar.visibledate.month - 1;
         }
         //显示到标签中
         lbltodaysdate.text = "today is  :" + my_calendar.todaysdate.toshortdatestring();
     }
     //选择一个日期的时候触发函数
     protected void calendar_select(object sender, eventargs e)
     {
         lblcountupdate();
         lblselectedupdate();
         txtclear();
     }
     //下拉框触发函数
     protected void month_selectedchange(object sender, eventargs e)
     {
         my_calendar.selecteddates.clear();
         lblselectedupdate();
         lblcountupdate();
         //重新设置时间
         my_calendar.visibledate = new datetime(my_calendar.visibledate.year,
             int32.parse(month_list.selecteditem.value), 1);
         txtclear();
     }

     //重构函数01-修改日期的次数
     private void lblcountupdate() {
         lblcount.text = "the count of selected:" + my_calendar.selecteddates.count.tostring();      
     }
     //重构函数02-清楚数据
     private void txtclear() {
         txtend.text = "";
         txtstart.text = "";
     }
     //重构函数03-修改日期
     private void lblselectedupdate() {
         if (my_calendar.selecteddate != datetime.minvalue)
             lblselcteddate.text = "the  selected day is :" +
                 my_calendar.selecteddate.toshortdatestring();
     }
     //按钮1:显示所选月份的所有星期五
     protected void btntgif_click(object sender, eventargs e)
     {
         int currnetmonth = my_calendar.visibledate.month;
         int curretnyear = my_calendar.visibledate.year;
         //先清除原先日历位置
         my_calendar.selecteddates.clear();
         //如果日期是星期五则将其添加到日历中
         for (int i = 1; i <= system.datetime.daysinmonth(
             curretnyear, currnetmonth); i++) {

                 datetime datetime = new datetime(curretnyear, currnetmonth, i);
                 if (datetime.dayofweek == dayofweek.friday)
                     my_calendar.selecteddates.add(datetime);
             }
         lblselectedupdate();
         lblcountupdate();
     }
     //按钮2:
     protected void btnrange_click(object sender, eventargs e)
     {
         int currnetmonth = my_calendar.visibledate.month;
         int curretnyear = my_calendar.visibledate.year;

         datetime startdate = new datetime(curretnyear, currnetmonth,int32.parse(txtstart.text));
         datetime endtartdate = new datetime(curretnyear, currnetmonth, int32.parse(txtend.text));
         my_calendar.selecteddates.clear();
         my_calendar.selecteddates.selectrange(startdate,endtartdate);

         lblcountupdate();
         lblselectedupdate();
     }
 }

calender.aspx
复制代码 代码如下:

<%@ page language="c#" autoeventwireup="true" codefile="calender.aspx.cs" inherits="mytest_calender" %>

 <!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">

 <html xmlns="http://www.w3.org/1999/xhtml">
 <head runat="server">
     <title>calender  control</title>
 </head>
 <body>
     <form id="form1" runat="server">
     <div>
         <h1>calender  control</h1>
         <h2></h2>
         <asp:calendar id="my_calendar" runat="server"
                     onselectionchanged="calendar_select">
         </asp:calendar>
         <br  />
         <asp:label id="lblcount" runat="server" text="label"></asp:label>
         <br />
         <asp:label id="lbltodaysdate" runat="server" text="label"></asp:label>
         <br />
         <asp:label id="lblselcteddate" runat="server" text="label"></asp:label>

         <table>
            <tr>
                <td>select a month</td>
                <td>
                    <asp:dropdownlist id="month_list" runat="server"
                        autopostback="true"
                        onselectedindexchanged="month_selectedchange">
                        <asp:listitem text="january" value="1" />
                        <asp:listitem text="february" value="2" />
                        <asp:listitem text="march" value="3" />
                        <asp:listitem text="april" value="4" />
                        <asp:listitem text="may" value="5" />
                        <asp:listitem text="june" value="6" />
                        <asp:listitem text="july" value="7" />
                        <asp:listitem text="augut" value="8" />
                        <asp:listitem text="september" value="9" />
                        <asp:listitem text="october" value="10" />
                        <asp:listitem text="november" value="11" />
                        <asp:listitem text="december" value="12" />
                    </asp:dropdownlist>
                </td>
                <td>
                    <asp:button id="btntgif" runat="server"
                        text="tgif"
                        onclick="btntgif_click"/>
                </td>
            </tr>
            <tr>
                <td  colspan="2"> </td>
            </tr>
            <tr>
                <td  colspan="2"><b>day range</b></td>
            </tr>

            <tr>
                <td >starting  day</td>
                <td >ending  day</td>
            </tr>

            <tr>
                <td >
                    <asp:textbox id="txtstart" runat="server"
                        width="25" maxlength="2"></asp:textbox>
                </td>
                <td >
                    <asp:textbox id="txtend" runat="server"
                        width="25" maxlength="2"></asp:textbox>
                </td>
                <td >
                    <asp:button id="btnrange" runat="server" text="apply"
                      onclick="btnrange_click" style="height: 21px"/>
                </td>
            </tr>
         </table>
     </div>
     </form>
 </body>
 </html>

总结: 

(1  采用一些重构,将一些函数方法分离出去,这一块有一些还没分离完全

(2  日期控件还有visiblmonthchanged事件来处理日历是否被用户更改了月份,   e.newdate.year 和e.previousdate.year诸如此类的比较

(3 dayrender事件,可以通过cell和day来呈现日期的特殊性,例如周末和节假日的颜色,  

             e.day.isothermonth    e.day.isweekend  等