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GridView select row

Posted on 2013-06-19
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Last Modified: 2013-06-19
Hi,

Im trying to change the value of lblXVal label control by changing the value in the textbox1 control (by firing textbox_changed event). When I change the value in the textbox its changes values in all lblXval controls in the grid instead of changing the lblXval for the current row where I changed the TextBox1 value.

		  <asp:GridView ID="gvFiles" runat="server" AutoGenerateColumns="False" BackColor="White"
			BorderColor="#999999" BorderStyle="Solid" BorderWidth="1px" CellPadding="3" ForeColor="Black"
			GridLines="Vertical" OnRowDeleting="Delete" DataKeyNames="id" Width="682px">
			<AlternatingRowStyle BackColor="#CCCCCC" />
			<Columns>
			   <asp:TemplateField HeaderText="X" SortExpression="xval">
				 <ItemTemplate>
				    <asp:Label ID="lblXVal" runat="server" Text='<%# Bind("xval") %>'></asp:Label>
				 </ItemTemplate>
			   </asp:TemplateField>

			   <asp:TemplateField HeaderText="Scale">
				 <ItemTemplate>
				    <asp:TextBox ID="TextBox1" runat="server" Text="1" AutoPostBack="true" ontextchanged="TextBox2_TextChanged"></asp:TextBox>
				 </ItemTemplate>
			   </asp:TemplateField>
...

code
 protected void TextBox2_TextChanged (object sender, EventArgs e)
   {

	 for (int count = 0 ; count < gvFiles.Rows.Count ; count++)
	 {
	    string x = ((Label)gvFiles.Rows[count].FindControl ("lblXVal")).Text;
	    string s = ((TextBox)gvFiles.Rows[count].FindControl ("TextBox1")).Text;

	    Label t = ((Label)gvFiles.Rows[count].FindControl ("lblXVal"));

	    t.Text = (Convert.ToDouble (x) * Convert.ToDouble (s)).ToString ();

	 }

}

Open in new window


How can I fix the the problem?


Ayha
0
Comment
Question by:ayha1999
  • 4
  • 2
7 Comments
 
LVL 18

Expert Comment

by:Cluskitt
ID: 39259037
You're looping all rows. Instead of using for, just run it once and use e.RowIndex as the row number.
0
 
LVL 7

Author Comment

by:ayha1999
ID: 39259185
how can I RowIndex? please give me the code.

Thanks
0
 
LVL 13

Expert Comment

by:Jitendra Patil
ID: 39259187
Hi ayha1999

you need to make some changes in aspx code as below:

1. add a javascript in the head section of your page
<script type="text/javascript" language="javascript">

        function DoPostBackWithRowIndex(rowIndex){
            if (document.getElementById('<%=HDVal.ClientID%>') != null) {
                document.getElementById('<%=HDVal.ClientID%>').value = rowIndex;
            }
            return true;
        }
    </script>
2.add a hidden field above your grid view as
<asp:HiddenField ID="HDVal" runat="server" />

3. Now add a row databound event to your gridview and do the code as follows:
 protected void gvFiles_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                TextBox TxtMarks = (TextBox)e.Row.FindControl("TextBox1");
                TxtMarks.Attributes.Add("onkeydown", "javascript:return DoPostBackWithRowIndex('" + e.Row.RowIndex + "');");
            }
        }
4 .Now modify your Textchanged event as below
protected void TextBox2_TextChanged(object sender, EventArgs e)
        {
            if (HDVal.Value.Trim().Length == 0)
            {
                return;
            }
            else
            {
                int Rowindex= Convert.ToInt32(HDVal.Value);    
                string x = ((Label)gvFiles.Rows[Convert.ToInt16(Rowindex)].FindControl("lblXVal")).Text;
                string s = ((TextBox)gvFiles.Rows[Rowindex].FindControl("TextBox1")).Text;

                Label t = ((Label)gvFiles.Rows[Rowindex].FindControl("lblXVal"));
                t.Text = (Convert.ToDouble(x) * Convert.ToDouble(s)).ToString();
            }
        }
and it will work as expected.

hope this helps.
0
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LVL 7

Author Comment

by:ayha1999
ID: 39259263
Hi patil786,

I tried followed you code exacty, it is firing but not changing the value of lblXVal.

Please check.

Thanks
0
 
LVL 13

Accepted Solution

by:
Jitendra Patil earned 2000 total points
ID: 39259476
it is working here i have tested the code  let me give you  complete code for the same.

.aspx code
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script type="text/javascript" language="javascript">

        function DoPostBackWithRowIndex(rowIndex){
            if (document.getElementById('<%=HDVal.ClientID%>') != null) {
                document.getElementById('<%=HDVal.ClientID%>').value = rowIndex;
            }
            return true;
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
<asp:HiddenField ID="HDVal" runat="server" />
                    <asp:GridView ID="gvFiles" runat="server" 
        AutoGenerateColumns="False" BackColor="White"
			BorderColor="#999999" BorderStyle="Solid" BorderWidth="1px" CellPadding="3" ForeColor="Black"
			GridLines="Vertical"  DataKeyNames="eno" Width="682px" 
         onrowdatabound="gvFiles_RowDataBound">
			<AlternatingRowStyle BackColor="#CCCCCC" />
			<Columns>
			   <asp:TemplateField HeaderText="X" SortExpression="xval">
				 <ItemTemplate>
				    <asp:Label ID="lblXVal" runat="server" Text='<%# Bind("sal") %>'></asp:Label>
				 </ItemTemplate>
			   </asp:TemplateField>

			   <asp:TemplateField HeaderText="Scale">
				 <ItemTemplate>
				    <asp:TextBox ID="TextBox1" runat="server" Text="1" AutoPostBack="true" ontextchanged="TextBox2_TextChanged"></asp:TextBox>
				 </ItemTemplate>
			   </asp:TemplateField>

               </Columns>
               </asp:GridView>

</form>
</body>
</html>

Open in new window

.cs code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
namespace TestWebApplication
{
    public partial class WebForm5 : System.Web.UI.Page
    {
	 protected void Page_Load(object sender, EventArgs e)
        	{

            if (!Page.IsPostBack)
            {
                filldatagrid();
            }


        }
        public void filldatagrid()
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("eno");
            dt.Columns.Add("empname");
            dt.Columns.Add("sal");


            DataRow DR = dt.NewRow();
            DR["eno"] = "1";
            DR["empname"] = "Patil";
            DR["sal"] = "500";
            dt.Rows.Add(DR);

            DataRow DR1 = dt.NewRow();
            DR1["eno"] = "2";
            DR1["empname"] = "Manish";
            DR1["sal"] = "100";
            dt.Rows.Add(DR1);


            DataRow DR2 = dt.NewRow();
            DR2["eno"] = "3";
            DR2["empname"] = "Shirish";
            DR2["sal"] = "200";
            dt.Rows.Add(DR2);


            gvFiles.DataSource = dt;
            gvFiles.DataBind();

        }

 protected void TextBox2_TextChanged(object sender, EventArgs e)
        {
            if (HDVal.Value.Trim().Length == 0)
            {
                return;
            }
            else
            {
                int Rowindex= Convert.ToInt32(HDVal.Value);    
                string x = ((Label)gvFiles.Rows[Convert.ToInt16(Rowindex)].FindControl("lblXVal")).Text;
                string s = ((TextBox)gvFiles.Rows[Rowindex].FindControl("TextBox1")).Text;

                Label t = ((Label)gvFiles.Rows[Rowindex].FindControl("lblXVal"));
                t.Text = (Convert.ToDouble(x) * Convert.ToDouble(s)).ToString();
            }
        }

 protected void gvFiles_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                TextBox TxtMarks = (TextBox)e.Row.FindControl("TextBox1");
                TxtMarks.Attributes.Add("onkeydown", "javascript:return DoPostBackWithRowIndex('" + e.Row.RowIndex + "');");
            }
        }
}
}

Open in new window


now the above code is tested and its working fine here without any problem.

Hope this helps.
0
 
LVL 7

Author Closing Comment

by:ayha1999
ID: 39259606
Thank you so much.

ayha
0
 
LVL 7

Author Comment

by:ayha1999
ID: 39260049
Hi patil,

Could you please have look the following question?

http://www.experts-exchange.com/Security/IDS/Q_28161806.html

Thanks

ayha
0

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