Add New Rows to an existing ASP.Net Table

kishan66
kishan66 used Ask the Experts™
on
Hi,
Using (ASP Button or HyperLink)  onClick -> Add New Rows to an existing ASP table

I have create a table on button click (pls see code under code section).

Now, when ever user clicks on "Add More" , 4 Rows have to be appended to the existing table.

pls suggest me using javascript or ASP.net itself

ASP.net 2.0, C#.net

ASPX code
---------
<div>
    Rows: <asp:TextBox ID="txtRows" runat="server" Width="30px"> </asp:TextBox> <br />
    Cols: &nbsp;<asp:TextBox ID="txtCols" runat="server" Width="30px"></asp:TextBox>
     <asp:Button ID="btnGenerate" OnClick="btnGenerate_Click" runat="server" Text="Generate" />&nbsp;<br /> <br />
     <asp:Button ID="btnMoreRows" OnClick="btnMoreRows_Click" runat="server" Text="Add More" />&nbsp;<br /> <br />
	<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>  


ASPX.CS code
------------
ASP-Table Creation Function:
protected void btnGenerate_Click(object sender, EventArgs e)
{
    CreateDynamicTable();
}
 private void CreateDynamicTable()
{
    PlaceHolder1.Controls.Clear();
    // Fetch the number of Rows and Columns for the table 
    // using the properties
    int tblRows = 4;
    int tblCols = 4;
    // Create a Table and set its properties 
    //tb1 = new Table();
    // Add the table to the placeholder control
    PlaceHolder1.Controls.Add(tbl);
    // Now iterate through the table and add your controls 
    for (int i = 0; i < tblRows; i++)
    {
        TableRow tr = new TableRow();
        for (int j = 0; j < tblCols; j++)
        {
            TableCell tc = new TableCell();
            TextBox txtBox = new TextBox();
            txtBox.Text = "RowNo:" + i + " " + "ColumnNo:" + " " + j;
            // Add the control to the TableCell
            tc.Controls.Add(txtBox);
            // Add the TableCell to the TableRow
            tr.Cells.Add(tc);
        }
        // Add the TableRow to the Table
        tbl.Rows.Add(tr);
    }            
}

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kishan66

Author

Commented:
Hi all,

i'm trying to add new rows by using AppendRows() on another Button click event.

But, when the event is fired , the table which was created initially is gone.. there fore no more rows are added
is there any way i can retain the initial table though i click "Add More" button


 
private void AppendRows()
{
 for (int rowCtr = 1; rowCtr <= 3; rowCtr++)
{
   ct = tbl.Rows.Count;
    TableRow trow = new TableRow();
  tbl.Rows.Add(trow);
   for (int colCtr = 1; colCtr <= 3; colCtr++)
  {
      TableCell tCell = new TableCell();
       trow.Cells.Add(tCell);
      // Mock up a product ID.
       string prodID = rowCtr + "_" + colCtr;
        // Add a literal text as control.
       tCell.Controls.Add(new LiteralControl("Buy: "));
      }
  }
}

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Rick

Commented:
If you're creating the table dynamically, you will need to create it again on each postback, then add the new rows.
kishan66

Author

Commented:
rick_gwu,

I have values entered by User in Intial table .. to which i have to add more rows, if needed.
Calling the CreateTable in PostBack will remove all the values from the Intial Table
Rick

Commented:
You could save the table in session variable, repopulate it on postback, then add the new rows.
Commented:
On postback, you could try recreating the controls and table in the Init event so that the dynamic controls can load their postback data.

protected void Page_Init(object sender, EventArgs e)
{
     if(IsPostBack)
     {
         CreateDynamicTable();
     }
}

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