I know this question have been asked many times and with my limited knowledge of JS I have tried everything, I simply can not make any solutions work. So I've bound my data to GridView :
Dim dt As DataTable = New DataTable()
dt.Columns.Add(New DataColumn("ID"))
dt.Columns.Add(New DataColumn("NAME"))
dt.Columns.Add(New DataColumn("CITY"))
dt.Columns.Add(New DataColumn("CURRENT JOB"))
dt.Columns.Add(New DataColumn("@COMPANY"))
dt.Columns.Add(New DataColumn("C")) ' communication
dt.Columns.Add(New DataColumn("S")) 'select
Dim ID As String
Dim name As String
Dim city As String
Dim current_job As String
Dim company As String
Dim com As String
For i = 0 To ds.Tables(0).Rows.Count - 1
ID = ds.Tables(0).Rows(i)(1).ToString()
name = ds.Tables(0).Rows(i)(2).ToString()
city = ds.Tables(0).Rows(i)(3).ToString()
current_job = ds.Tables(0).Rows(i)(9).ToString()
company = ds.Tables(0).Rows(i)(10).ToString()
If ds.Tables(0).Rows(i)(12).ToString() = "" Then
com = ""
Else
com = "X"
End If
dt.Rows.Add(ID, name, city, current_job, company, com, "S")
Next
candidate_grid_view.DataSource = dt
candidate_grid_view.DataBind()
I've registered cell click on candidate_grid_view.OnRowDataBound event :
Protected Sub Candidate_OnRowDataBound(sender As Object, e As System.Web.UI.WebControls.GridViewRowEventArgs)
If e.Row.RowType = DataControlRowType.DataRow Then
e.Row.Attributes("onclick") = Page.ClientScript.GetPostBackClientHyperlink(candidate_grid_view, "Select$" & e.Row.RowIndex)
e.Row.Attributes("style") = "cursor:pointer"
End If
End Sub
I can easy get row index by candidate_grid_view.SelectedRow.RowIndex in OnSelectedIndexChanged event, but I need click event for column (cell) that will register cell index (column index). There is no cellindex propery!?
Protected Sub Candidate_OnSelectedIndexChanged(sender As Object, e As EventArgs)
Dim index As Integer = candidate_grid_view.SelectedRow.RowIndex
End Sub
Why something that easy as getting column index in VB.NET so complicated in ASP.NET?
CodePudding user response：
Well, havng a row click - very easy.
So, lets work our way though this.
first, a gv - simple markup like this:
<div style="padding:25px;width:50%">
<asp:GridView ID="GridView1" runat="server"
AutoGenerateColumns="False" DataKeyNames="ID" CssClass="table">
<Columns>
<asp:BoundField DataField="FirstName" HeaderText="FirstName" />
<asp:BoundField DataField="LastName" HeaderText="LastName" />
<asp:BoundField DataField="HotelName" HeaderText="HotelName" />
<asp:BoundField DataField="City" HeaderText="City" />
<asp:BoundField DataField="Description" HeaderText="Description" />
<asp:TemplateField HeaderText="View" ItemStyle-HorizontalAlign="Center">
<ItemTemplate>
<asp:Button ID="cmdView" runat="server" Text="View" CssClass="btn"
OnClick="cmdView_Click" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
Our code to fill is this:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
LoadGrid
End If
End Sub
Sub LoadGrid()
Using conn As New SqlConnection(My.Settings.TEST4)
Dim strSQL As String = "SELECT * FROM tblHotelsA ORDER BY HotelName"
Using cmdSQL As New SqlCommand(strSQL, conn)
conn.Open()
Dim rstData As New DataTable
rstData.Load(cmdSQL.ExecuteReader())
GridView1.DataSource = rstData
GridView1.DataBind()
End Using
End Using
End Sub
Protected Sub cmdView_Click(sender As Object, e As EventArgs)
Dim btn As Button = sender
Dim gRow As GridViewRow = btn.NamingContainer
Debug.Print("Row click index = " & gRow.RowIndex)
' get primary key (hidden by datakeys
Dim PKID As Integer = GridView1.DataKeys(gRow.RowIndex).Item("ID")
Debug.Print("Data base row PKID = " & PKID)
Debug.Print("hotel name of this row = " & gRow.Cells(2).Text)
End Sub
And now if we click on view button (for the row), then we have this:
Ok, so that so far - very easy.
Now, what about a row click anywhere - not necessary on the button?
Gee, all controls? I would dump "cells" and drop in standard asp.net controls into that GV - (such as I did for the button). However, with a lot of columns, this becomes a pain - (too many messy "templatefield" tags - I don't like those).
As a result, I would dump the GV, and go to a listview.
However, lets just force code our way though this. But, I been doing this for a long time - never had to just get the cell information.
But, you can say do this:
In our row data bound, just add a click event to each cell, say like this:
Protected Sub GridView1_RowDataBound(sender As Object, e As GridViewRowEventArgs) Handles GridView1.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then
For i As Integer = 0 To e.Row.Cells.Count - 2 ' skip last button cell
Dim MyCell As TableCell = e.Row.Cells(i)
Dim RowCol As string = e.Row.RowIndex & "," & i
MyCell.Attributes.Add("onclick", "MyClick('" & RowCol & "')")
Next
End If
End Sub
All we did was add a row, and col value.
So, now in our markup, we have this:
</asp:GridView>
<asp:HiddenField ID="HRowInfo" runat="server" />
<asp:Button ID="cmdRowClick" runat="server" Text="Row click" ClientIDMode="Static"
onclick="cmdRowClick_Click" CommandArgument="0" />
<script>
function MyClick(RowInfo) {
$("#HRowInfo").val(RowInfo)
$('#cmdRowClick').click()
}
</script>
So, we shove value into hidden field, and click our button - just a plane jane button below the grid (we would hide it with style="display:none"
And code behind is this:
Protected Sub cmdRowClick_Click(sender As Object, e As EventArgs)
Debug.Print(HRowInfo.Value)
End Sub
Now, when I click on any cell, I get a output of the row, colum, say like this:
And from above, I can index into the Gridview.Rows and then cells the two values.
However, I am not convinced that we really need/want a click event on the cells - we "might", but then again, might be better to put some controls on that form - as a repating grid, and work on a row by row basis.
As noted, I tend to use ListView for this.
Say we have the above hotel list, but I want the user to enter a value in a "cell" for say the number of nights. But the grid displays the nightly rate, and when I enter the number of nights, I want another column to show the total cost.
We COULD try and deal and wire up say a cell, but is is VERY rare i need to do this.
But, with a standard control, it does become somewhat easy.
As I stated, I never really liked GV for doing this kind of thing, but lets add to above the nights text box, the night rate, and a total column.
(We ARE better to use a listview, but no big deal).
so, lets assume this markup:
<asp:GridView ID="GridView1" runat="server"
AutoGenerateColumns="False" DataKeyNames="ID" CssClass="table">
<Columns>
<asp:BoundField DataField="FirstName" HeaderText="FirstName" />
<asp:BoundField DataField="LastName" HeaderText="LastName" />
<asp:BoundField DataField="HotelName" HeaderText="HotelName" />
<asp:BoundField DataField="City" HeaderText="City" />
<asp:BoundField DataField="Description" HeaderText="Description" />
<asp:TemplateField HeaderText="Nights">
<ItemTemplate>
<asp:TextBox ID="txtNights" runat="server" TextMode="Number"
Text = '<%# Eval("Nights") %>' Width ="40">
</asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Per night">
<ItemTemplate>
<asp:Label ID="LPrice" runat="server" Text='<%# Eval("Price", "{0:C2}") %>' >
</asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Total">
<ItemTemplate>
<asp:Label ID="txtAmount" runat="server"
Text='<%# Eval("Tamount", "{0:c}") %>'
width="50"
>
</asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
So, same code to fill - (no row data bound event).
Ok, so we now have this:
Now, lets assume I want to change the number of nights. I don't REALLY need a cell click, do I? I just want the user to type in the number of nights, and then say update the Total amount.
So, we just add a plane jane text changed event to that text box, (and auto post-back).
So, the markup becomes this:
<asp:TemplateField HeaderText="Nights">
<ItemTemplate>
<asp:TextBox ID="txtNights" runat="server" TextMode="Number"
Text = '<%# Eval("Nights") %>' Width ="40"
OnTextChanged="txtNights_TextChanged"
AutoPostBack="true"
>
</asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
We now can just click on any "nights" cell in the grid, enter a new value and hit tab, or move out and click on another row.
the code for the text changed event looks like this:
Protected Sub txtNights_TextChanged(sender As Object, e As EventArgs)
Dim txtNights As TextBox = sender
Dim gRow As GridViewRow = txtNights.NamingContainer
Dim lPrice As Label = gRow.FindControl("LPrice")
Dim TotalAmount As Label = gRow.FindControl("txtAmount")
TotalAmount.Text = (lPrice.Text * txtNights.Text).ToString("C2")
End Sub
So, this is why I am suggesting that you in general don't needd a cell click event.
You "might", but in most cases I don't think you do.