ASP.NET - gridviews problems

Asked By sunil pandey on 04-Mar-12 10:02 AM
hi all

i have a gridview with checkox. when  i am selecting any checkbox that row should be removed for always from gridview.
but it should be in database.
can any one help me..

[)ia6l0 iii replied to sunil pandey on 04-Mar-12 11:10 AM
I am not sure why would you "not" remove from database. That means the data would not be synchronized for the user with the database. Or perhaps, you are looking for a client-side script that removes and then later, you would sync it with server. 

Either the case be, this is what I would do:

Write a jQuery function to delete the row if the checkbox changes event.
$(function(){
    $(".checked").change(event){
        function(){
            $(this).closest('tr').remove();
        }
    }
});

Note, that you need to add the css "checked" to the checkbox. 
<asp:CheckBox ID="chkDelete" CssClass="checked" runat="server"/>

Or you can write it in a more generic fashion like this
$('table').delegate('input:checkbox', 'click', function () {
    $(this).closest('tr').remove();
});
 ​
However to sync with the database, I would do this way.
Create a template field , add it to the columns collection. In the item template, add a checkbox. 
<asp:GridView ID="gridviewEmployees" runat="server" DataKeyNames="EmployeeID" >
    <Columns>
      <asp:TemplateField>
          <ItemTemplate>
            <asp:CheckBox ID="chkDelete" runat="server"/>
          </ItemTemplate>
       </asp:TemplateField>
    </Columns>
</asp:GridView>

Set the DataKeyName to a column that would let you delete the rows. In the above example it is EmployeeID.
<asp:GridView ID="gridviewEmployees" runat="server" DataKeyNames="EmployeeID" >
</asp:GridView>

And then anywhere in your code, loop thru the rows collection of the gridview and look for the checkbox control and its Checked property. 
        foreach (GridViewRow row in gridviewEmployees.Rows)
        {
            CheckBox checkbox = (CheckBox)row.FindControl("chkDelete");
            if (checkbox.Checked)
            {
int employeeID = Convert.ToInt32(gridviewEmployees.DataKeys[row.RowIndex].Value);
//Do whatever you want with the employeeID.
            }
        }

Hope this helps.
Web Star replied to sunil pandey on 04-Mar-12 11:56 AM
There are good example which show you how can delete row based on checkbox in gridview in asp.net
http://www.aspdotnet-suresh.com/2011/02/how-to-delete-multiple-rows-in-gridview.html
hope this helps you
dipa ahuja replied to sunil pandey on 04-Mar-12 12:01 PM

1. Take one column status in your table and set its value as 0

2. Bind your gridview with this query:

 

 string q = "select * from table1 where status=0";

 

3. Take checkbox inside the grid

     <asp:CheckBox ID="CheckBox1" runat="server" />

    

and a delete button

protected void CheckBox2_CheckedChanged(object sender, EventArgs e)

{

  CheckBox chk1 = (CheckBox)GridView1.HeaderRow.FindControl("CheckBox2");

  foreach (GridViewRow r in GridView1.Rows)

  {

    /* search id in itemtemplate */

    CheckBox chkin = (CheckBox)r.FindControl("CheckBox1");

    if (chkin.Checked)

    {

      //getting datakey/primary key value

      string id = GridView1.DataKeys[r.RowIndex].Value.ToString();

 

      //fire update query

      string q = "Update table1 set status=1 where id=" + id;

 

      //rebind the griview here. call the method where you are binding gridview

 

    }

  }

}

\


kalpana aparnathi replied to sunil pandey on 04-Mar-12 02:26 PM
hi,

Try below code:

<asp:GridView ID="gridView1" runat="server" AutoGenerateColumns="False"
  DataSourceID="ObjectNewsletter" DataKeyNames="Id"/>

private List<string> GetSelectedItems()
{
  List<string> Selected = new List<string>();
   
  foreach (GridViewRow row in gridView1.Rows)
  {
    CheckBox chx = (CheckBox)row.Cells[0].FindControl("checkBox1");
    if (chx == null || !chx.Checked) continue;
 
    if (gridView1.DataKeys != null)
    {
      string id = gridView1.DataKeys[row.RowIndex].Value.ToString();
      Selected.Add(id);
    }
  }
  return Selected;
}