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Cascading combo-box not functioning properly

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ComboBox
This is a migrated thread and some comments may be shown as answers.
Xorv
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Xorv asked on 08 May 2012, 09:18 AM

I've two combo-box(Countries and States). Combo-box 2 (States) should load associated States with the value selected in the Combo-box 1(Countries).

Problem:- first time selection of a Countries combo-box item, loads the correct associated States in the 2nd combo-box. But when an another value is selected in combo-box 1. The Values inside combo-box still displays old values.

NOTE:- On 2nd time NewValues are loaded properly in combo-box 2. But those are not displayed when the the combo-box arrow is click (Only old values are visible). But if we type anything in that 2nd combo-box, New values are displayed.

QUESTION:- I want evertime the new values are loaded up in 2nd combo-box, it should be displayed on the click of combo-box arrow. Not just after typing something.

CLASS:-

protected void Countries_SelectedIndexChanged(Object sender, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)
{
    int countryIDselected = Convert.ToInt32(Countries.SelectedValue);
    bool AdvanceSearchFlag = true;
    Session["AdvanceSearchFlag"] = AdvanceSearchFlag;
    Session["countryIDselected"] = countryIDselected.ToString();
  
    int totalStates = States.Items.Count;
    int xyz = totalStates - 1;        if (totalStates != 0)
    {
        while (totalStates > 0)
        {
            States.Items.Remove(totalStates - 1);
            totalStates --;
        }
    }
    States.Items.Clear();
}
  
protected void States_ItemsRequested(object sender, Telerik.Web.UI.RadComboBoxItemsRequestedEventArgs e)
{
    foreach (StateyLookupInfo state in StateLookupList.GetList(false))
    {
        RadComboBoxItem item = new RadComboBoxItem(State.StateName, State.StateID.ToString());
        comboBox.Items.Add(item);
    }
}

ASPX:-
<telerik:RadComboBox ID="Countries" runat="server" AutoPostBack="True" OnSelectedIndexChanged="Countries_SelectedIndexChanged" />
<telerik:RadComboBox ID="States" runat="server" AutoPostBack="True" EnableLoadOnDemand="true" OnItemsRequested="States_ItemsRequested" />

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Dimitar Terziev
Telerik team
answered on 10 May 2012, 01:53 PM
Hello,

In order to force a request for items whenever the second RadComboBox is opened, the OnClientDropDownOpening event should be handled with the following implementation of the event handler function:
function OnClientDropDownOpening(sender, args) {
 
      if (sender.get_items().get_count() > 0)
          sender.requestItems("", false);
  }

Greetings,
Dimitar Terziev
the Telerik team
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ComboBox
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Xorv
Top achievements
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Answers by
Dimitar Terziev
Telerik team
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