how to select the item in radcombobox based on item value ?

Question

_{Wednesday, January 2, 2013 7:32 AM}

Hi,

I am using **radcombobox **in my project, bind the combo box using page methods see this link.(last method) Working fine to display the items based on loadondemond, but after save the data when i am trying to edit  i am assigning to radcombobox based on item value , but it is not working properly, because radcombobox items are not loaded .

 my code is
i am trying bellow two ways

1. RadComboBox4.SelectedValue = dr["AgentID"].ToString();

2) RadComboBox4.FindItemByValue(dr["AgentID"].ToString()).Selected = true; 

the second method  showing the error , selecteditem and selectedindex always shows null and -1. 

please can any one help me to come out this problem .

Thanks,
hemanth

All replies (6)

_{Wednesday, January 2, 2013 8:21 AM}

What i know findbyvalue/findbytext is case sensitive, so make sure about the case

        if (RadComboBox4.FindItemByValue(dr["AgentID"].ToString()) != null)
        {
            RadComboBox4.FindItemByValue(dr["AgentID"].ToString()).Selected = true;
        }

_{Wednesday, January 2, 2013 8:55 AM}

Hi oned , thanks for reply 

I checked that code but same problem, i think there is no items in Radcombobox4 assigning time, but code is correct AgentId matching value is  there in radcombobox but it always shows null.

_{Wednesday, January 2, 2013 9:04 AM}

make sure you rcb already bound before make selection

if (!ispostback)
{
  RadComboBox4.DataBind()
}
//make selection here

_{Wednesday, January 2, 2013 9:35 AM}

there is no binding in radcombobox , my code is

default.aspx.cs page

 [WebMethod]
        public static RadComboBoxData GetCompanyNames(RadComboBoxContext context)
        {
            DataTable data = GetData(context.Text);

            RadComboBoxData comboData = new RadComboBoxData();
            int itemOffset = context.NumberOfItems;
            int endOffset = Math.Min(itemOffset + ItemsPerRequest, data.Rows.Count);
            comboData.EndOfItems = endOffset == data.Rows.Count;

            List<RadComboBoxItemData> result = new List<RadComboBoxItemData>(endOffset - itemOffset);

            for (int i = itemOffset; i < endOffset; i++)
            {
                RadComboBoxItemData itemData = new RadComboBoxItemData();
                itemData.Text = data.Rows[i]["Name"].ToString();
                itemData.Value = data.Rows[i]["ID"].ToString();

                result.Add(itemData);
            }

            comboData.Message = GetStatusMessage(endOffset, data.Rows.Count);

            comboData.Items = result.ToArray();
            return comboData;
        }

default.aspx

 <telerik:RadComboBox ID="RadComboBox4" runat="server" Width="250px" Height="150px"
                                                            EmptyMessage="Select a Company" EnableLoadOnDemand="true" ShowMoreResultsBox="true"
                                                            EnableVirtualScrolling="true" Label="Page Methods:" AutoPostBack="true" OnSelectedIndexChanged="RadComboBox4_SelectedIndexChanged">
                                                            <WebServiceSettings Method="GetCompanyNames" Path="ClientInfo.aspx" />
                                                        </telerik:RadComboBox>




RadComboBox4_SelectedIndexChanged event 

if (RadComboBox4.SelectedValue != "")
                {
                    AgentId = Convert.ToInt32(RadComboBox4.SelectedValue);
                    hideddlAgent.Text = RadComboBox4.SelectedValue;
                }

-->SelectedValue and text only display the data remaining selectedindex and selecteditem all are no values .

_{Thursday, January 3, 2013 7:02 AM}

Hi,

By design when a RadComboBox with enabled Load-On-Demand feature is loaded - it is empty and it has no items. Load-On-Demand fires and populates the control with data if the user types in the input area or clicks on the drop-down toggle image when there are no items in the RadComboBox.

Additionally the RadComboBox items are not accessible on the server-side when loading them on demand and that is why they cannot be accessed using the server-side FindItemByText / Value methods - please take a look at this help article.

Thanks,

Shinu.

_{Thursday, January 3, 2013 8:15 AM}

try set AutoPostBack="false"