RadCombobox get_text javascript throw exception due to this.get_inputDomElement() is null

[Jeffery]

get_text:function(){if(this.get_simpleRendering()){return this._text;
}else{return this.get_inputDomElement().value;

}}

Javascript Call stack:
_onChangeHelper()
  get_text()

Way to simulate:
I had bind the postback function on Enter key (onkeypress), the error will occurred when I type few characters and press Enter key immediately.

This is sample markup I using:
<telerik:RadComboBox ID="cboSearchBox" runat="server" Height="88px" EnableLoadOnDemand="true"
                    MarkFirstMatch="false" ShowMoreResultsBox="true" EnableVirtualScrolling="true"
                    AllowCustomText="true"  ShowDropDownOnTextboxClick="false"
                    OnItemsRequested="cboSearchText_ItemsRequested" ShowToggleImage="false" ItemsPerRequest="6"
                    MinFilterLength="3" 
                    OnClientItemsRequesting="SearchController.HandleSendRequest" CloseDropDownOnBlur="true"
                    Width="450px" AutoPostBack="false" OnClientSelectedIndexChanged="SearchController.HandleSelectedIndexChanged"
                    DropDownWidth="450px" HighlightTemplatedItems="true" Filter="None">
 <asp:Button ID="btnSearch" runat="server" Text="Search" CssClass="button" OnClick="btnSearch_Click" />
<script type="text/javascript">
var postbackFunction = "<%= this.Page.ClientScript.GetPostBackEventReference(this.btnSearch, null) %>";
var SearchController = (function () {
TriggerSearch: function () {
            var cb = $find("<%=cboSearchBox.ClientID %>");
                eval(postbackFunction);
        }
} ());
function pageLoad() {
        $("#<%=cboSearchBox.ClientID %>_Input").keydown(function (event) {
            SearchController.SetSearchMessage('');
            if (event.which == 13) {
                SearchController.TriggerSearch();
            }
        });
</script>
This error won't appear if using older version.
Please kindly advise. Thanks :)

[Nencho]

Hello Jeffery,

I noticed that you sent us a support ticket (Ticket ID : 647259), regarding the same topic. I can suggest you to continue our conversation in the support ticket, in order to have a consistent correspondence.

Kind regards,
Nencho
the Telerik team

[Mike]

What is the resolution for this? We are experiencing the same issue w/ the latest Telerik release: 2012.3.1308.40, dated 1/7/2013.

Thank you,

Mike Oliver

[Nencho]

Hi Mike,

The described issue was not replicated at our end. Could you specify the problem you are facing and the version of our controls that you use? In addition, could you provide us your implementation, in order to replicate the issue at our end?

Kind regards,
Nencho
the Telerik team

[Tim]

Same issue here, exact same cause as described by the original poster. Seems to be a timing issue somehow related with how fast one hits the enter key and how fast the webservice delivers the search result.

[Mike]

Yes - we found it to be a timing issue as well. I didn't follow up w/ a sample that demonstrates the issue because we decided to go with the previous Q4 '12 release instead - which was too bad....

[Hristo Valyavicharski]

Hi,

I am afraid that we are still unable to replicate the described exception. For that matter I would like to ask you to provide us with a runnable sample demonstrating the issue or a snippet of code with the declaration, in order to reproduce the issue at our side.

Regards,
Hristo Valyavicharski
the Telerik team

[Venkataramireddy]

i am also facing same problem

please check my code

},get_text:function(){if(this.get_simpleRendering()){return this._text; }else{return this.get_inputDomElement().value;

a.RadComboBox.prototype._addNewItems=function(m,r){this.set_selectedItem(null);
this.set_highlightedItem(null); this._childControlsCreated=true; var h=this.get_items().get_count();

    <telerik:RadComboBox ID="RcmbPartsId" AppendDataBoundItems="false"  runat="server" 
 TabIndex="1" AllowCustomText="true"                                                                                             
AutoPostBack="true" ToolTip="Part #" MarkFirstMatch="true" EmptyMessage="Please Select Part" 
OnSelectedIndexChanged="RcmbPartsId_SelectedIndexChanged" EnableLoadOnDemand="true" 
ShowMoreResultsBox="true" EnableVirtualScrolling="true" AccessibilityMode="true"> 
<WebServiceSettings Method="GetPartsforSitepart" Path="../Services/AutoCompleteForAllModules.asmx" />                                                                                         
</telerik:RadComboBox>

please find resolution

[Hristo Valyavicharski]

Hi Venkataramireddy,

We are finding difficulties to isolate this behavior.  Please open a new support ticket and attach sample with steps to reproduce. Once we have it, we will debug your code and search for solution.

Thanks.

Regards,
Hristo Valyavicharski
Telerik

[François-Xavier]

Hi,

like Venkataramireddy, we encounter a javascript error (maybe asynchronous load with webservice use in RadCombobox). I understand that you can't reproduce easily that error because it seems to be a random one. Here is a more complete javascript stack trace that may be help you to find a solution:

Uncaught TypeError: Cannot call method 'get_count' of null Telerik.Web.UI.WebResource.axd:10514
a.RadComboBox._addNewItems Telerik.Web.UI.WebResource.axd:10514
a.RadComboBox._onWebServiceResponse Telerik.Web.UI.WebResource.axd:10509
(anonymous function) Telerik.Web.UI.WebResource.axd:6
(anonymous function) Telerik.Web.UI.WebResource.axd:6
Telerik.Web.UI.WebServiceLoader._raiseEvent Telerik.Web.UI.WebResource.axd:966
Telerik.Web.UI.WebServiceLoader._onWebServiceSuccess Telerik.Web.UI.WebResource.axd:961
(anonymous function) Telerik.Web.UI.WebResource.axd:6
l Telerik.Web.UI.WebResource.axd:6
(anonymous function) Telerik.Web.UI.WebResource.axd:6
Sys.Net.WebRequest.completed Telerik.Web.UI.WebResource.axd:6
_onReadyStateChange

good luck

[Hristo Valyavicharski]

Hi François-Xavier,

The provided stack trace doesn't provide much information.  Please refer to this article to see why we are requesting sample with additional details.

Thanks.

Regards,
Hristo Valyavicharski
Telerik