ASP.NET工程中日历控件的典型应用之一

很多朋友问我，如何动态选择日期呢，如何选择完日期以后，关闭本页同时把日期传入上一页呢？这个问题也曾经困扰我许久，在ASP中我知道如何做，可是在ASP.NET中却有点迷惑。

为此，我查阅了很多的资料，终于研究通了，现在分享给大家。

源代码如下：calendar.aspx.cs

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
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 WebApplication_rd
{
 /// <summary>
 /// Summary description for WebForm1.
 /// </summary>
 public class calendar : System.Web.UI.Page
 {
  protected System.Web.UI.WebControls.Label Label1;
  protected System.Web.UI.WebControls.DataGrid DataGrid1;
 
  private void Page_Load(object sender, System.EventArgs e)
  {
   if (! Page.IsPostBack)
    BindData();
  }

  private void BindData()
  {
   SqlConnection con = new SqlConnection("server=localhost;database=Northwind;uid=sa;pwd=;");
   SqlCommand cmd = new SqlCommand("SELECT TOP 10 * FROM Orders", con);

   try
   {
    con.Open();
    DataGrid1.DataSource = cmd.ExecuteReader();
    DataGrid1.DataBind();
    con.Close();
   }
   catch (Exception ex)
   {
    Trace.Warn(ex.Message);
   }
  }

  #region Web Form Designer generated code
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: This call is required by the ASP.NET Web Form Designer.
   //
   InitializeComponent();
   base.OnInit(e);
  }
  
  /// <summary>
  /// Required method for Designer support - do not modify
  /// the contents of this method with the code editor.
  /// </summary>
  private void InitializeComponent()
  {   
   this.DataGrid1.CancelCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_CancelItemCommand);
   this.DataGrid1.EditCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_EditItemCommand);
   this.DataGrid1.UpdateCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_UpdateItemCommand);
   this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_OnItemDataBound);
   this.Load += new System.EventHandler(this.Page_Load);

  }
  #endregion

  private void DataGrid1_EditItemCommand(object sender, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   DataGrid1.EditItemIndex = e.Item.ItemIndex;
   BindData();
  }

  private void DataGrid1_CancelItemCommand(object sender, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   DataGrid1.EditItemIndex = -1;
   BindData();
  }

  private void DataGrid1_UpdateItemCommand(object sender, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   Int32 iLastCellIndex = e.Item.Cells.Count-1; //The Index for the last cell
   String sNewDate = ((TextBox)e.Item.Cells[iLastCellIndex].FindControl("txtDate")).Text; //Get the value of the TextBox
   Label1.Text = "You set the date " + sNewDate;
   //Add database updating here
   DataGrid1.EditItemIndex = -1;
   BindData();
  }

  private void DataGrid1_OnItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
  {
   if ( e.Item.ItemType == ListItemType.EditItem )
   {
    Int32 iLastCellIndex = e.Item.Cells.Count-1; //The Index for the last cell
    String sTextBoxName = e.Item.Cells[iLastCellIndex].FindControl("txtDate").ClientID; //The rendered name of the TextBox
    String sLink = "<a href=\"javascript:pickDate(''''" +
     sTextBoxName +
     "'''');\"><IMG SRC=\"i/iCalendar.gif\" border=\"0\" align=\"absmiddle\"></a>"; //The HTML to add to the Edit cell
    e.Item.Cells[iLastCellIndex].Controls.Add(new LiteralControl(sLink)); //Add the HTML
   }
  }

 }
}

CalendarPopUp.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 WebApplication_rd
{
 /// <summary>
 /// Summary description for CalendarPopUp.
 /// </summary>
 public class CalendarPopUp : System.Web.UI.Page
 {
  protected System.Web.UI.WebControls.LinkButton LinkButton1;
  protected System.Web.UI.WebControls.Calendar Calendar1;
 
  private void Page_Load(object sender, System.EventArgs e)
  {
   // Put user code to initialize the page here
  }

  #region Web Form Designer generated code
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: This call is required by the ASP.NET Web Form Designer.
   //
   InitializeComponent();
   base.OnInit(e);
  }
  
  /// <summary>
  /// Required method for Designer support - do not modify
  /// the contents of this method with the code editor.
  /// </summary>
  private void InitializeComponent()
  {   
   this.LinkButton1.Click += new System.EventHandler(this.LinkButton1_Click);
   this.Load += new System.EventHandler(this.Page_Load);

  }
  #endregion

  private void LinkButton1_Click(object sender, System.EventArgs e)
  {
      System.Text.StringBuilder sbScript  = new System.Text.StringBuilder();
   sbScript.Append("<script language=''''javascript''''>"); //Opening script tag
   sbScript.Append(Environment.NewLine); //Newline
   sbScript.Append("window.opener.document.all[''''"); //Reference to original window
   sbScript.Append(Request.QueryString["src"]); //Control to set value on
   sbScript.Append("''''].value = ''''"); //Set the value
   sbScript.Append(Calendar1.SelectedDate.ToShortDateString()); //The date
   sbScript.Append("'''';"); //End of line
   sbScript.Append(Environment.NewLine); //Newline
   sbScript.Append("window.close();"); //Close this window
   sbScript.Append(Environment.NewLine); //Newline
   sbScript.Append("</script>"); //Closing script tag

   //Add the script to the page
   this.Page.Controls.Add(new LiteralControl(sbScript.ToString()));
  }
 }
}

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