Set Selected Value ComboBox

[Milton]

People, can you help to select radcombo item in server side?
Look in my example

drpActive.SelectedValue = 2;

When I try this example above, RadComboBox does not select the element.

Can you help me to solve this, please?

Best Regards,

Milton Camara

[Shinu]

Hello Milton,
Try any of the following approaches:
C#:

if (!Page.IsPostBack)
{
  RadComboBox1.Text = "Text2";
}
//or
if(!Page.IsPostBack)
  {
   int index = RadComboBox1.FindItemIndexByValue("<combo_item_value>");
   RadComboBox1.SelectedIndex = index;
  }
//or
if(!Page.IsPostBack)
  {
   RadComboBoxItem item = RadComboBox1.FindItemByText("<combo_item_text>");
   item.Selected = true;
  }

Thanks,
Shinu.

[Milton]

Its not work yet. As I see in SelectedIndex or SelectedValue is a property ReadOnly without a Set method.
Understand me?

[Richard]

Milton:

Take a look at this code. It gets the "Paris" droplist option that is defined with an initial value of "2" in the "combobox.xml" and it resets the value to "0" using the server-side "PageLoad" event:

Note that the selectedvalue set takes a string value, not an integer.

Default.aspx:

<div>
    <telerik:RadComboBox ID="RadComboBox1" runat="server" Height="140px" Width="210px">
    </telerik:RadComboBox>
</div>

C#

using System;
using Telerik.Web.UI;

public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
            RadComboBox1.LoadContentFile("combobox.xml");

        //// Selects 'Paris" from droplist by index #
        //RadComboBox1.SelectedIndex = 1;

        //// Selects 'Paris" from droplist by assigned value
        //RadComboBox1.SelectedValue = "2";

        // Assigns a new value to 'Paris' droplist option
        RadComboBoxItem item1 = RadComboBox1.FindItemByValue("2");
        item1.Value = "0";

        // Selects 'Paris" from droplist by assigned value
        RadComboBox1.SelectedValue = "0";
    }
}

combobox.xml:

<?xml version="1.0" encoding="utf-8" ?>
<Items>
    <Item Text="New York" Value="1" />
    <Item Text="Paris" Value="2" />
    <Item Text="London" Value="3" />
    <Item Text="Oslo" Value="4" />
    <Item Text="Sofia" Value="5" />
    <Item Text="Liverpool" Value="6" />
    <Item Text="Seattle" Value="7" />
    <Item Text="San Francisco" Value="8" />
    <Item Text="Boston" Value="9" />
    <Item Text="Miami" Value="10" />
    <Item Text="Denver" Value="11" />
    <Item Text="Dallas" Value="12" />
    <Item Text="Madrid" Value="13" />
    <Item Text="Barcelona" Value="14" />
    <Item Text="Amsterdam" Value="15" />
    <Item Text="Moscow" Value="16" />
    <Item Text="Brussels" Value="17" />
    <Item Text="Bonn" Value="18" />
    <Item Text="Dublin" Value="19" />
    <Item Text="St.Paul" Value="20" />
</Items>

[Melchor]

It is an old post, but it helps someone else, this happened to me but was because I had EnableAutomaticLoadOnDemand set to true, so the items did not exists until the controls was clickced

[Johnny]

I can confirm that as well.

[Johnny]

Although this is an old post, but this can still be helpful to some people.

One of the solutions to be able to select an item from the ComboBox on page_load for example, is to disable the property EnableAutomaticLoadOnDemand. 

Example:

<telerik:RadComboBox ID="rcb_typeAction" runat="server" Skin="Material" AppendDataBoundItems="true" EnableLoadOnDemand="false" EnableAutomaticLoadOnDemand="false">
    <Items>
        <telerik:RadComboBoxItem runat="server" Text="Visite" Value="Visite" />
        <telerik:RadComboBoxItem runat="server" Text="Appel Téléphonique" Value="Appel Téléphonique" />
        <telerik:RadComboBoxItem runat="server" Text="Email" Value="Email" />
        <telerik:RadComboBoxItem runat="server" Text="À Distance" Value="À Distance" />
    </Items>
</telerik:RadComboBox>