[Solved] Reset LoadOnDemand Combobox

[Joe]

I have a method that I use to reset a form after a submit or if the user chooses to click a reset button. For the most part it works, however if Im using a combobox that is tied to a LoadOnDemand event, the selected item is still displayed. It does appear that the remaining items are reloaded when I click the dropdown arrow.

Here is the code I'm using:

public static void resetForm(Control parent)
 {
     foreach (Control c in parent.Controls)
     {
         if (c.Controls.Count > 0)
         {
             resetForm(c);
         }
         else
         {
             switch (c.GetType().ToString())
             {
                 case "Telerik.Web.UI.RadTextBox":
                     ((RadTextBox)c).Text = "";
                     break;

                 case "Telerik.Web.UI.RadComboBox":
                     ((RadComboBox)c).ClearSelection();
                     ((RadComboBox)c).Text = string.Empty;

                     break;

                 case "Telerik.Web.UI.RadTimePicker":
                     ((RadTimePicker)c).Clear();
                     break;

                 case "Telerik.Web.UI.RadDatePicker":
                     ((RadDatePicker)c).Clear();
                     break;

                 case "System.Web.UI.WebControls.CheckBox":
                     ((CheckBox)c).Checked = false;
                     break;

             }
         }
     }
 }

Thanks,

[Kalina]

Hello Joe,

You can try resetting RadComboBox by clearing its SelectedValue and Text:

<telerik:RadComboBox ID="RadComboBox1"
    runat="server"
    OnItemsRequested="OnItemsRequested"
    DataTextField="DisplayName"
    DataValueField="ID"
    EnableLoadOnDemand="True" >
</telerik:RadComboBox>
<asp:Button ID="btnSubmit" runat="server"  OnClick="OnClick" />

protected void OnClick(object sender, EventArgs e)
{
    RadComboBox1.SelectedValue = "";
    RadComboBox1.Text = "";

protected void OnItemsRequested(object sender, RadComboBoxItemsRequestedEventArgs e)
{
    RadComboBox1.DataSource = CreateDataSource();
    RadComboBox1.DataBind();
}

protected DataTable CreateDataSource()
{
    DataTable dt = new DataTable();
    dt.Columns.Add(new DataColumn("ID", typeof(string)));
    dt.Columns.Add(new DataColumn("DisplayName", typeof(string)));


    DataRow dr = dt.NewRow();
    dr["ID"] = "1";
    dr["DisplayName"] = "Name 1";
    dt.Rows.Add(dr);

    DataRow dr2 = dt.NewRow();
    dr2["ID"] = "2";
    dr2["DisplayName"] = "Name 2";
    dt.Rows.Add(dr2);

    DataRow dr3 = dt.NewRow();
    dr3["ID"] = "3";
    dr3["DisplayName"] = "Name 3";
    dt.Rows.Add(dr3);

    return dt;

}

All the best,
Kalina
the Telerik team

[Joe]

Thanks,

However, this didnt work. :(
The selected entry is still selected. Any other thoughts?

[Kalina]

Hello Joe,

Please find the example attached and give it a try.
I suppose that there is something in your implementation that prevents clearing the selection in RadComboBox.
Can you modify the code of the example in order to reproduce the issue, and then paste the code here using the "format code" tool?

All the best,
Kalina
the Telerik team