How to change DateTime filter dropdownlist's value?

[Pam Redrum]

I have using a custom filter operation, so after ItemCommond function
if (e.CommandName == RadGrid.FilterCommandName)
I set e.Canceled = true
But I want the datetime filter have the right selected item at the dropdownlist(NoFilter, GreaterThan or so)
I try to change the FilterMenu in Init, but I set it to selected and no use.
part code is

<telerik:RadGrid ID="RGViewMEdia" Skin="someSkin" EnableEmbeddedSkins="false"
            runat="server" CssClass="list_one" AutoGenerateColumns="False" AllowPaging="True"
            GridLines="None" Width="800px" DataKeyNames="somefield" AllowAutomaticDeletes="True"
            AllowSorting="True" ShowStatusBar="True" AllowFilteringByColumn="true" DefaultSortDirection="Descending"
            DefaultSortExpression="somefield" BorderStyle="None" PageSize="10" AllowCustomPaging="true" OnInit="RGViewMEdia_Init"
            OnItemCommand="RGViewMEdia_ItemCommand" OnNeedDataSource="RGViewMEdia_NeedDataSource" OnItemDataBound="RGViewMEdia_ItemDataBound"
            OnSortCommand="RGViewMEdia_ItemSortCommand" OnPageIndexChanged="RGViewMEdia_PageChangeCommand">

......
......

<telerik:GridDateTimeColumn DataField="somedatefield" HeaderText="DateTime" ReadOnly="True" UniqueName="PublishDate" DataType="System.DateTime"
                        SortExpression="somedatefield" DataFormatString="{0:dd.MM.yyyy}" ItemStyle-Width="80px" FilterListOptions="VaryByDataType"
                        PickerType="DatePicker" FilterControlWidth="60px"/>

......

some code behind is

protected void RGViewMEdia_ItemCommand(object sender, GridCommandEventArgs e)
        {
            if (e.CommandName == RadGrid.FilterCommandName)
{
...
}
                RGViewMEdia.CurrentPageIndex = 0;
                RGViewMEdia.Rebind();
                e.Canceled = true;
}

protected void RGViewMEdia_Init(object sender, EventArgs e)
        {
            GridFilterMenu menu = RGViewMEdia.FilterMenu;
            // Iterate through the items backwards
            // so that the indexing is not thrown off
            // when items are removed!
            for (int i = menu.Items.Count - 1; i >= 0; i--)
            {
                if (menu.Items[i].Text.IndexOf("Null")>=0)
                {
                    menu.Items.RemoveAt(i);
                }
                else if (menu.Items[i].Text.IndexOf("EqualTo") >= 0 && menu.Items[i].Text.IndexOf("Than") < 0)
                {
                    menu.Items.RemoveAt(i);
                }

            }

            if (Expression!=null&&Expression.PublicationDateOperate != DateOperate.NoFilter)
            {
                string operate;
                switch (Expression.PublicationDateOperate)
                {
                    case DateOperate.GreaterThan:
                        operate = "GreaterThan";
                        break;
                    case DateOperate.GreaterThanOrEqualTo:
                        operate = "GreaterThanOrEqualTo";
                        break;
                    case DateOperate.LessThan:
                        operate = "LessThan";
                        break;
                    case DateOperate.LessThanOrEqualTo:
                        operate = "LessThanOrEqualTo";
                        break;
                    default:
                        operate = "NoFilter";
                        break;
                }
                RadMenuItem item = menu.Items.FindItem(i => i.Text == operate);
                if(item!=null)
                    item.Selected = true;
            }
        }

[Pam Redrum]

I have tried use RGViewMEdia.MasterTableView.FilterExpression = string.Format("([somedatefield] {0} '{1}')", ">", datevalue) in RGProductList_ItemCommand
but seems no use too (the datetime filter's dropdownlist do not select the GreaterThan)

[Radoslav]

Hello Pam,

To achieve the desired functionality you could try setting the filtered column's CurrentFilterFunction and CurrentFilterValue properties. For example:

protected void RadGrid1_PreRender(object sender, System.EventArgs e)
{
  if (Expression!=null&&Expression.PublicationDateOperate != DateOperate.NoFilter)
  {
    GridColumn column = RadGrid1.MasterTableView.GetColumnSafe("ColumnUniqueName");
    column.CurrentFilterFunction = GridKnownFunction.Contains;
    column.CurrentFilterValue = "EnteredFilterValue";
    RadGrid1.MasterTableView.Rebind();
  }
}

I hope this helps.

All the best,
Radoslav
the Telerik team

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