RadComboBox problem with requesting items

[Petr]

Hi, I want to disable AllowCustomText in RadComboBox I find this article AllowCustomText Cannot Be Disabled When Loading Items on Demand and try to implement it. I set these property in my onLoad method​:

EnableLoadOnDemand = false;
EnableViewState = true;
ShowMoreResultsBox = true;
EnableVirtualScrolling = true;
AppendDataBoundItems = true;
ShowToggleImage = true;
NoWrap = true;
AllowCustomText = false;
MarkFirstMatch = true;
HighlightTemplatedItems = true;
DropDownWidth = 350;
MaxHeight = 250;
Filter = RadComboBoxFilter.Contains;

and register these events

ItemsRequested += new RadComboBoxItemsRequestedEventHandler(comboItemsRequested);
OnClientDropDownOpening = "OnClientComboBoxDropDownOpeningHandler";

where client script is

function OnClientComboBoxDropDownOpeningHandler(sender, eventArgs) {
   try {

       sender.requestItems("", false);

   } catch (e) {
       radalert(e.message + "<br>"+ e.stack)
   }
}

My combobox is defined in modal window so it is shown on user request and hide after selection. It works perfectly when I open it for the first time. But if I open combobox, hide the dialog and open it again then it doesn't work. Clicking on combobox doesn't start dropDown event and the script. For testing I add the same client script on event OnClientKeyPressing. It starts the script, but it throws this exception:

b is undefined

and stack trace:
Telerik.Web.UI.ControlItem.prototype._initialize@http://localhost:60103/Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_ctl00_ctl00_ctl00_ctl00_ContentBody_ContentMain_RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+Telerik.Web.UI%2c+Version%3d2013.3.1114.40%2c+:1978:1

b.RadComboBox._createChildControls@http://localhost:60103/Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_ctl00_ctl00_ctl00_ctl00_ContentBody_ContentMain_RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+Telerik.Web.UI%2c+Version%3d2013.3.1114.40%2c+:3850:1

b.RadComboBox.prototype._createChildControls@http://localhost:60103/Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_ctl00_ctl00_ctl00_ctl00_ContentBody_ContentMain_RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+Telerik.Web.UI%2c+Version%3d2013.3.1114.40%2c+:3317:1

b.RadComboBox.prototype._ensureChildControls@http://localhost:60103/Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_ctl00_ctl00_ctl00_ctl00_ContentBody_ContentMain_RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+Telerik.Web.UI%2c+Version%3d2013.3.1114.40%2c+:3318:67

b.RadComboBox.prototype.requestItems@http://localhost:60103/Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_ctl00_ctl00_ctl00_ctl00_ContentBody_ContentMain_RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+Telerik.Web.UI%2c+Version%3d2013.3.1114.40%2c+:4659:2

OnClientComboBoxDropDownOpeningHandler@http://localhost:60103/Js/ContentClient/def_content_client.js?v=0.3.0.1:215:16 Sys.EventHandlerList.prototype.getHandler/<@http://localhost:60103/Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_ctl00_ctl00_ctl00_ctl00_ContentBody_ContentMain_RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+Telerik.Web.UI%2c+Version%3d2013.3.1114.40%2c+:6:51366


Do you have any idea what can be wrong?

Thank you,
Petr

​

[Petr]

The problem is solved. I initialize data source in OnLoad method and it is not necessary to request items in event OnClientDropDownOpening anymore.

 Petr

[Nencho]

Hello Petr,

Thank you for sharing your solution with the community.

Regards,
Nencho
Telerik