让Calendar在页面调用时才显示
最近常有朋友问起这样一个问题:在ASP.NET里如何做到当需要调用Calendar时,就让它显示,选择完时间后让它自动隐藏,并返回一个日期字符串到文本输入框内。
曾经我看到网上流行的一个用VB.NET写的UserControl实现了这部分功能,在这里我把它改成C#的版本,供需要的朋友下载学习。
总的来说这个功能分两步,第一步建立一个UserControl控件:
它的代码如下(popUpCalendar.ascx):
<%@ Control Language="c#" AutoEventWireup="false" Codebehind="popUpCalendar.ascx.cs" Inherits="CalendarExample.popUpCalendar" TargetSchema="http://schemas.microsoft.com/intellisense/ie5" %>
<asp:panel runat="server">
<asp:Calendar runat="server" BackColor="White" BorderColor="Black" BorderStyle="Solid" NextMonthText="<IMG src="http://www.host01.com/Get/Net/000200011/monthright.gif">" PrevMonthText="<IMG src="http://www.host01.com/Get/Net/000200011/monthleft.gif">">
<TodayDayStyle BackColor="#FFFFC0"></TodayDayStyle>
<DayStyle Font-Size="8pt" Font-Names="Arial"></DayStyle>
<DayHeaderStyle Font-Size="10pt" Font-Underline="True" Font-Names="Arial" BorderStyle="None" BackColor="#E0E0E0"></DayHeaderStyle>
<SelectedDayStyle Font-Size="8pt" Font-Names="Arial" Font-Bold="True" ForeColor="White" BackColor="Navy"></SelectedDayStyle>
<TitleStyle Font-Size="10pt" Font-Names="Arial" Font-Bold="True" ForeColor="White" BackColor="Navy"></TitleStyle>
<OtherMonthDayStyle ForeColor="Gray"></OtherMonthDayStyle>
</asp:Calendar>
</asp:panel>
对就的codebehind文件如下(popUpCalendar.ascx.cs):
namespace CalendarExample
{
using System;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
/// <summary>
/// popUpCalendar 的摘要说明。
/// </summary>
public abstract class popUpCalendar : System.Web.UI.UserControl
{
protected System.Web.UI.WebControls.Calendar Calendar1;
protected System.Web.UI.WebControls.Panel pnlCalendar;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
}
#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN:该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// 设计器支持所需的方法 - 不要使用
/// 代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Calendar1.SelectionChanged += new System.EventHandler(this.Calendar1_SelectionChanged);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
public void displayCalendar( string sCalToolText, DateTime dSelectedDate, string sDateFieldName , int iTop , int iLeft )
{
if (pnlCalendar.Visible == false)
{
pnlCalendar.Style["top"] = iTop.ToString ();
pnlCalendar.Style["left"] = iLeft.ToString ();
Calendar1.SelectedDate = dSelectedDate;
Calendar1.VisibleDate = dSelectedDate;
Calendar1.ToolTip = sCalToolText;
Calendar1.Attributes["SelectedField"] = sDateFieldName;
pnlCalendar.Visible = true;
}
else
hideCalendar();
}
public void hideCalendar()
{
pnlCalendar.Visible = false;
}
private void Calendar1_SelectionChanged(object sender, System.EventArgs e)
{
TextBox txtDate;
txtDate = (TextBox)Page.FindControl(Calendar1.Attributes["SelectedField"]);
txtDate.Text = Calendar1.SelectedDate.ToShortDateString();
hideCalendar();
}
}
}
第二步,在asp.net文件里调用这个UserControl;
它的代码如下(dispCalendar.aspx):
<%@ Register TagPrefix="sk" TagName="popUpCalendar" src="popUpCalendar.ascx"%>
<%@ Page language="c#" Codebehind="dispCalendar.aspx.cs" AutoEventWireup="false" Inherits="CalendarExample.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1</title>
<meta content="Microsoft Visual Studio 7.0">
<meta content="C#">
<meta content="Javascript">
<meta content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form method="post" runat="server">
<sk:popupcalendar runat="server"></sk:popupcalendar>
<table>
<tr>
<td>
Select Date:
</td>
<td>
<asp:TextBox runat="server"></asp:TextBox>
</td>
<td>
<asp:ImageButton runat="server" ImageUrl="calendar.gif"></asp:ImageButton>
</td>
</tr>
</table>
</form>
</body>
</HTML>
对应的codebehind文件如下(dispCalendar.aspx.cs):
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
namespace CalendarExample
{
/// <summary>
/// WebForm1 的摘要说明。
/// </summary>
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.TextBox txtStartDate;
protected System.Web.UI.WebControls.ImageButton Button1;
protected popUpCalendar myCalendar;
private void Page_Load(object sender, System.EventArgs e)
{
if (!IsPostBack)
myCalendar.hideCalendar();// 在此处放置用户代码以初始化页面
}
#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN:该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Button1.Click += new System.Web.UI.ImageClickEventHandler(this.Button1_Click);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void Button1_Click(object sender, System.Web.UI.ImageClickEventArgs e)
{
DateTime dSelDate;
try
{
dSelDate=DateTime.Parse(txtStartDate.Text);
}
catch
{
dSelDate=DateTime.Now;
}
myCalendar.displayCalendar("Select a start date", dSelDate,"txtStartDate", 22, 215);
}
}
}