Load on Demand for Filtering

[John John]

Dear Telerik,

            Kindly directme to solve the scenario of loading the combo box based on the value of the recentcombo selection. After initially loading the values to all combo’s, if I choosethe value of the first combo and do filtering the second combo should need tofill with the available values instead of binding the whole items from the DB.

I could see that the scenario is elaborated with the Telerikfiltering demo, but used the Sqldatasource and calls the Refresh method in orderto achieve the scenario.

 protected void RefreshCombos()
        {
            SqlDataSource2SqlDataSource2.SelectCommand = SqlDataSource2.SelectCommand + " WHERE " + RadGrid1.MasterTableView.FilterExpression.ToString();
            SqlDataSource3SqlDataSource3.SelectCommand = SqlDataSource3.SelectCommand + " WHERE " + RadGrid1.MasterTableView.FilterExpression.ToString();
            SqlDataSource4SqlDataSource4.SelectCommand = SqlDataSource4.SelectCommand + " WHERE " + RadGrid1.MasterTableView.FilterExpression.ToString();

            RadGrid1.MasterTableView.Rebind();
        }

 protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)
    {
        // Filter controls value binding
        if (e.Item.ItemType == GridItemType.FilteringItem)
        {
            DataSet dsStates = null;

            RadTextBox txtName;
            txtName = (RadTextBox)e.Item.FindControl("txtName");
            if (ViewState["txtName"] != null)
            {
                txtName.Text = ViewState["txtName"].ToString();
            }

             RadComboBox StateComboBox;
            StateComboBox = (RadComboBox)e.Item.FindControl("StateComboBox");
            sql = "sp_GetNames ";
            StateComboBox.ClearSelection();
            StateComboBox.DataSource = dsStates.Tables[0];
            StateComboBox.DataTextField = "State";
            StateComboBox.DataValueField = "State";
            StateComboBox.DataBind();
            StateComboBox.Items.Insert(0, new RadComboBoxItem("   All ", " All "));
            StateComboBox.SelectedIndex = 0;

            if (ViewState["txtState"] != null)
            {
                StateComboBox.FindItemByText(ViewState["txtState"].ToString()).Selected = true;
            }

protected void StateComboBox_IndexChanged(object o, RadComboBoxSelectedIndexChangedEventArgs e)
    {
        //Code for customized server side filtering
        string filterState = "";
        if (e.Text.Trim() != "All")
        {
            filterState = "([State] = '" + e.Text + "')";
        }
        else
        {
            filterState = "([State] <> '')";
        }

        ViewState["txtState"] = e.Text.ToString();
        vwState = filterState;

        if (vwGroupID != null)
        {
            filterState += " And " + vwGroupID;
        }

        //Calling FilterExpression finally
        RadGrid1.MasterTableView.FilterExpression = filterState;
        RadGrid1.MasterTableView.Rebind();
    }

I could not find the best way to do the scenario with dynamicallycreated combo as it is achieved in Telerik demo for filtering

Thanks and looking forward for yours ideas

[Yavor]

Hi John,

The following code library entry contains additional information on a possible approach:

http://www.telerik.com/community/code-library/aspnet-ajax/general/using-related-radcomboboxes-in-radgrid.aspx

I hope it gets you started properly.

All the best,
Yavor
the Telerik team

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[John John]

Hi Yavor,

                    The above mentioned link did help me to know how to bind the drop down in demand. But i would like to know whether it is applicable with Filter Template combo's. As i mentioned above i would like to load the combo on demand dynamically by coding without using SqlDatasource.

Hope  now you could point my scenario.

-Thanks

[Yavor]

Hi John,

The same approach is applicable in a filter template as well. Essentially, in the SelectedIndexChanged handler, you can alter the datasource of the related control.

Sincerely yours,
Yavor
the Telerik team

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