How to implement popup Calendar dialog box with DataGrid

当你有一个DataGrid控件，而且DataGrid允许用户删除网格（grid）中的一行时，你不需要某些客户端代码，你只需要点击网格上的Delete按钮就可以删除行了，但是删除时不会提示用户进行确认。这时Attributes属性就派得上用场了。你可以用DataGrid的ItemDataBound()服务器事件给网格中的每个删除按钮添加一个属性。当你用DataGrid的DataBind方法将数据绑定到网格时，所添加的每一行都会触发ItemDataBound事件。在事件中添加的代码如下：

Private Sub MyDataGrid_ItemDataBound(ByVal _
   Sender as object, ByVal e As _
   System.Web.UI.WebControls. _
   DataGridItemEventArgs) _
   Handles MyDataGrid.ItemDataBound

' This code adds javascript to the "Del" 
' button on each row in 
   ' the datagrid the javascript displays a 
   ' message box to the 
   ' user, confirming the delete action
   Dim btnDel As LinkButton
   Const DEL_COLUMN As Int16 = 1
      
   If Not (e.Item.ItemType = _
      ListItemType.Header Or _
   e.Item.ItemType = _
      ListItemType.Footer) Then

   btnDel = _
         e.Item.Cells(DEL_COLUMN).Controls(0)
   btnDel.Attributes.Add("onClick", _
         "confirmDelete();")

   End If

End Sub

客户要在DataGrid里绑定日期数据，并显示一个按钮，按钮按了以后弹出一个Calendar，可供选择日期。选择的结果要还给原来的DataGrid。给他做了一个：

有一点，在DataGrid.ItemCreated事件里取不到control的正确的Client ID或Unique ID，老是返回“TextBox1”，弄得client side script很难写……而在DataGrid.ItemDataBound事件里就能取到“DataGrid1__ctl2_TextBox1”……未及深究，不知道有没有人能给个solid的解释……

re: 在ASP.Net DataGrid中制作弹出式的日期选择Calendar 2004-12-11 4:23 Lostinet

ItemCreated的时候，Item并没有Add到DataGrid.Controls中，所以无法自动生成ID。
可以在ItemCreated时，得到e.Item
绑定e.Item.Init+=new ...

void e_Item_Init(..)
{
DataGridItem item=(DataGridItem)sender;
在这里做能得到UniqueID/ClientID的初始化。
}

The following two pages will demonstrate how to use client side "window.showModalWindow" in combination with ASP.Net server side PostBack.

=======================WebForm1.aspx=========================

<%@ Page language="c#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1</title>
</HEAD>
<body MS_POSITIONING="GridLayout">
<form + senderTextBox.value);
   //debugger;
   if (returnValue != null) {
    senderTextBox.value = returnValue.toString();
   }
   //Cancel the postback.
   return false;
}
</script>
</body>
</HTML>

=======================CalendarDialog.aspx=========================

<%@ Page language="c#" AutoEventWireup="true"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>CalendarDialog</title>
<base target=_self>
</HEAD>
<body MS_POSITIONING="GridLayout">
<form ,dt.ToShortDateString());
}
Calendar1.SelectionChanged += new EventHandler(Calendar1_SelectionChanged);
}

protected void Calendar1_SelectionChanged(object sender, System.EventArgs e)
{
   RegisterHiddenField("selectedDate",this.Calendar1.SelectedDate.ToShortDateString());
}
</script>
<script language=javascript>
function returnToMainForm() {
   window.returnValue = window.Form1.selectedDate.value;
   window.close();
}
</script>
</body>
</HTML>