Hi Daniel,
From your description, you've made the WebForm DataGrid fire the Select
Command when click anywhere on a datagrid row via the following tech
article:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dv_vstechar
t/html/vbtchTopQuestionsAboutASPNETDataGridServerControl.asp
I've read the above article and also generate some tests based on it. Since
the webform DataGrid is different from winform which doesn't provide
buildin means to get the current clicked cell because the Webform datagrid
is actually rendered out to clientside as a <table> ....</table> html
element. And each row of the dataGrid is a <tr> ...</tr>
each cell is a <td>... </td>
And in the article, it make use of the ItemDataBound event and add a
"onclick" clientside event for the DataGridItem Row so that when we click
on anywhere within a DataGrid Row , it'll fire the select command event.
However, the select command doesn't contain any information about which
Cell(Column) in the DataGrid row is clicked, yes?
I've tried John's suggestion on using the second param of the
Page.GetPostBackClientHyperlink(button, "") method , but found it won't
work for this issue.
Currently, my solution on this problem is still using the ItemDataBound
event, in addition to add and "onclick" clientside event for each
DataGridItem, we also have to add a "onclick" event functoin for each Cell
of the Item, forexample,
Dim col As Integer
For col = 0 To e.Item.Cells.Count - 1
e.Item.Cells(col).Attributes.Add("onclick",
"setCurrentColumn('" & col & "')")
Next
And the "setCurrentColumn" is a javascript function in the Page which set a
value to a <input type=hidden ..> elemetn in the page. You can see we use
this javascript to assign the current clicked Cell(<td>..</td>)'s columsn
index to the <input type=hidden ..> element. And we need to put the row
information of the currrent click Cell's Row index in the LinkButton's
CommandArgument as below:
Dim button As LinkButton = _
CType(e.Item.Cells(0).Controls(0), LinkButton)
Dim row As Integer = e.Item.ItemIndex
button.CommandArgument = row.ToString()
Then, in the DataGrid's ItemCommand event, we can get the current selected
Cell's row/col info like below:
Private Sub dgMain_ItemCommand(ByVal source As Object, ByVal e As
System.Web.UI.WebControls.DataGridCommandEventArgs) Handles
dgMain.ItemCommand
If e.CommandName = "Select" Then
Response.Write("<br>Row: " + e.CommandArgument)
Response.Write("<br>Col: " + hdCell.Value)
End If
End Sub
To make it clearly, I've pasted my test page's code at the bottom of this
message. Please refer to it if you have anything unclear. Thanks.
Regards,
Steven Cheng
Microsoft Online Support
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========================aspx ==============================
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>CellGrid</title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" content="Visual Basic .NET 7.1">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema"
content="
http://schemas.microsoft.com/intellisense/ie5">
<script language="javascript">
function setCurrentColumn(col)
{
document.getElementById("hdCell").value = col;
}
</script>
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<table width="100%" align="center">
<tr>
<td></td>
</tr>
<tr>
<td>
<asp
ataGrid id="dgMain" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:ButtonColumn Text="Select" HeaderText="Select"
CommandName="Select"></asp:ButtonColumn>
<asp:BoundColumn DataField="index"
HeaderText="Index"></asp:BoundColumn>
<asp:BoundColumn DataField="name"
HeaderText="Name"></asp:BoundColumn>
<asp:BoundColumn DataField="email"
HeaderText="Email"></asp:BoundColumn>
</Columns>
</asp
ataGrid></td>
</tr>
<tr>
<td><INPUT id="hdCell" type="hidden" name="hdCell" runat="server"
value="0|0"></td>
</tr>
</table>
</form>
</body>
</HTML>
===============code behind======================================
Public Class CellGrid
Inherits System.Web.UI.Page
#Region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub
InitializeComponent()
End Sub
Protected WithEvents dgMain As System.Web.UI.WebControls.DataGrid
Protected WithEvents hdCell As
System.Web.UI.HtmlControls.HtmlInputHidden
'NOTE: The following placeholder declaration is required by the Web
Form Designer.
'Do not delete or move it.
Private designerPlaceholderDeclaration As System.Object
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Init
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
InitializeComponent()
End Sub
#End Region
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
If Not IsPostBack Then
Bind_Data()
End If
End Sub
Private Sub Bind_Data()
Dim tb As New DataTable("MyUser")
tb.Columns.Add("index", GetType(Integer))
tb.Columns.Add("name", GetType(String))
tb.Columns.Add("email", GetType(String))
Dim row As DataRow
Dim i As Integer
For i = 1 To 10
row = tb.NewRow()
row("index") = i
row("name") = "Name" + i.ToString()
row("email") = "Name" + i.ToString() + "@test.com"
tb.Rows.Add(row)
Next
dgMain.DataSource = tb
dgMain.DataBind()
End Sub
Private Sub dgMain_ItemDataBound(ByVal sender As Object, ByVal e As
System.Web.UI.WebControls.DataGridItemEventArgs) Handles
dgMain.ItemDataBound
Dim itemType As ListItemType = e.Item.ItemType
If ((itemType = ListItemType.Pager) Or _
(itemType = ListItemType.Header) Or _
(itemType = ListItemType.Footer)) Then
Return
Else
Dim button As LinkButton = _
CType(e.Item.Cells(0).Controls(0), LinkButton)
Dim row As Integer = e.Item.ItemIndex
button.CommandArgument = row.ToString()
e.Item.Attributes("onclick") = _
Page.GetPostBackClientHyperlink(button, "")
Dim col As Integer
For col = 0 To e.Item.Cells.Count - 1
e.Item.Cells(col).Attributes.Add("onclick",
"setCurrentColumn('" & col & "')")
Next
End If
End Sub
Private Sub dgMain_SelectedIndexChanged(ByVal sender As Object, ByVal e
As System.EventArgs) Handles dgMain.SelectedIndexChanged
End Sub
Private Sub dgMain_ItemCommand(ByVal source As Object, ByVal e As
System.Web.UI.WebControls.DataGridCommandEventArgs) Handles
dgMain.ItemCommand
If e.CommandName = "Select" Then
Response.Write("<br>Row: " + e.CommandArgument)
Response.Write("<br>Col: " + hdCell.Value)
'Response.Write("<br>CommandArgument: " + e.CommandArgument)
'Response.Write("<br>CommandSource: " +
e.CommandSource.ToString())
End If
End Sub
End Class
