Sunday, 20 January 2013

How to add additional element(DropDownList) in GridView pager without using PagerTemplate.

PagerTemplate allows to create any configuration of pager but it also requires custom paging to be implemented. Sometimes built-in paging completely meet all needs but a little modification is reduired, for example, ability to change page size. That can be done within RowCreated event handler.
<asp:GridView ID="GridView1" runat=server AllowPaging="True" OnRowCreated="GridView1_RowCreated" ...
Code behind:
protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.Pager)
    {
        DropDownList ddl = new DropDownList();
        //adds variants of pager size
        ddl.Items.Add("5");
        ddl.Items.Add("10");
        ddl.AutoPostBack = true;
        //selects item due to the GridView current page size
        ListItem li = ddl.Items.FindByText(GridView1.PageSize.ToString());
        if (li != null)
            ddl.SelectedIndex = ddl.Items.IndexOf(li);
        ddl.SelectedIndexChanged += new EventHandler(ddl_SelectedIndexChanged);
        //adds dropdownlist in the additional cell to the pager table
        Table pagerTable = e.Row.Cells[0].Controls[0] as Table;
        TableCell cell = new TableCell();
        cell.Style["padding-left"] = "15px";
        cell.Controls.Add(new LiteralControl("Page Size:"));
        cell.Controls.Add(ddl);
        pagerTable.Rows[0].Cells.Add(cell);
    }
}
void ddl_SelectedIndexChanged(object sender, EventArgs e)
{
    //changes page size
    GridView1.PageSize = int.Parse(((DropDownList)sender).SelectedValue);
    //binds data source
    GridView1.DataSource = ...;
    GridView1.DataBind();
}
Source code - 1.9 kB

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