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Problem after postback when tabs are created at client-side

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TabStrip

This is a migrated thread and some comments may be shown as answers.

giovaneBrazil asked on 06 Oct 2010, 06:55 PM

Dear Support , please advice ...
im creating a page like this telerik demo :
http://demos.telerik.com/aspnet-ajax/window/examples/radwindowandmdi/defaultcs.aspx
using the same javascript code , even whit the
tabStrip.trackChanges();
and
tabStrip.commitChanges();
however i put a .net dropdownlist whith a postback event ( to set a profile that i whant to get in new windows) , and everytime the dropdownlist do the postback AND i created a new tab ( javascript ) , i got an .net error OBJECT REFERENCE NOT SET ....

COULD SOME ONE PLEASE HELP ME ? what more should i so ?

thnks !

NullReferenceException: Referência de objeto não definida para uma instância de um objeto.]
   Telerik.Web.UI.NavigationItem.LoadFromDictionary(IDictionary`2 dictionary) +104
   Telerik.Web.UI.RadTab.LoadFromDictionary(IDictionary`2 dictionary) +19
   Telerik.Web.UI.ClientStateLogPlayer`1.Insert(ClientStateLogEntry entry, ControlItemCollection items, Int32 index) +105
   Telerik.Web.UI.ClientStateLogPlayer`1.Play(ClientStateLogEntry entry) +219
   Telerik.Web.UI.ClientStateLogPlayer`1.Play(IEnumerable`1 clientStateLogEntry) +135
   Telerik.Web.UI.RadTabStrip.LoadLogEntries(TabStripClientState state) +34
   Telerik.Web.UI.RadTabStrip.LoadClientState(TabStripClientState state) +40
   Telerik.Web.UI.RadTabStrip.LoadPostData(String postDataKey, NameValueCollection postCollection) +166
   Telerik.Web.UI.RadDataBoundControl.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +13
   System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +690
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1743

7 Answers, 1 is accepted

answered on 03 Feb 2011, 04:25 PM

Any solution found to this problem mentioned above ??? I have the same problem:

Error Message:Object reference not set to an instance of an object.
Stack Trace:   at Telerik.Web.UI.NavigationItem.LoadFromDictionary(IDictionary`2 dictionary)
   at Telerik.Web.UI.RadTab.LoadFromDictionary(IDictionary`2 dictionary)
   at Telerik.Web.UI.ClientStateLogPlayer`1.Insert(ClientStateLogEntry entry, ControlItemCollection items, Int32 index)
   at Telerik.Web.UI.ClientStateLogPlayer`1.Play(ClientStateLogEntry entry)
   at Telerik.Web.UI.ClientStateLogPlayer`1.Play(IEnumerable`1 clientStateLogEntry)
   at Telerik.Web.UI.RadTabStrip.LoadLogEntries(TabStripClientState state)
   at Telerik.Web.UI.RadTabStrip.LoadClientState(TabStripClientState state)
   at Telerik.Web.UI.RadTabStrip.LoadPostData(String postDataKey, NameValueCollection postCollection)
   at Telerik.Web.UI.RadDataBoundControl.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection)
   at System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

It occurs when TabStrip is instantiated and some elements are added on it then I do postback by asp LinkButton on my page then error occurs.
I am using Telerik.Web.UI in version 2010.3.1317.35. I can not find any ticket about this problem.

Please help

answered on 04 Feb 2011, 01:58 PM

RadWindowAndMDI.zip

Hi,

We tried to reproduce the problem locally, but without much success. Please refer to our test files for details.
Do they work at your side? If yes, could you modify them with the exact your setup so we can see the problem locally?

Kind regards,
Helen
the Telerik team

Browse the vast support resources we have to jump start your development with RadControls for ASP.NET AJAX. See how to integrate our AJAX controls seamlessly in SharePoint 2007/2010 visiting our common SharePoint portal.

answered on 11 Feb 2011, 12:07 PM

Hi,

I tracked this bug using .Net Reflector and debugging your code. This problem occurs when in js this line is used

tab.set_imageUrl(menuItemImageUrl);

and menuItemImageUrl is null so then your code method

      if (dictionary.ContainsKey("imageUrl"))
      {
        this.ImageUrl = dictionary["imageUrl"].ToString();
      }
in class NavigationItem.cs in line 61
throws an exception because dictionary contains key "imageUrl" but value of this key is null so dictionary["imageUrl"].ToString() fails. Of course is's because tab.set_imageUrl(null) and it can be checked in js code before set null to tab image url but it will be better code to do it before getting value of specified key from dictionary. For example if(!String.IsNullOrEmpty(dictionary["imageUrl"])){ this.ImageUrl = dictionary["imageUrl"].ToString();.}. I attached example app showing this problem

answered on 13 Jan 2014, 06:08 PM

I am now having a similar problem after upgrading to the most current version (v2013.3.1114.40.)

- It happens after a postback from a linkbutton on the page containing the tabstrip, multipage and pageviews.

- However, it only happens if I scroll the tabstrip to the last tab first. (My tabstrip is several tabs longer than is visible when the page is first displayed.) And, the scrolling must be complete such that the right side scroll button becomes disabled.

- It does not happen if I reduce the number of tabs to avoid scrolling.

- I have not seen this behavior with the many previous versions I have used.

- This happens in IE11, but not Firefox and not Safari

Here is the stack trace:

Input string was not in a correct format.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.FormatException: Input string was not in a correct format.

Source Error:

 An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


            [FormatException: Input string was not in a correct format.]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +10896279
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +145
   System.ComponentModel.Int32Converter.FromString(String value, NumberFormatInfo formatInfo) +50
   System.ComponentModel.BaseNumberConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value) +328

[Exception: -1026.4 is not a valid value for Int32.]
   System.ComponentModel.BaseNumberConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value) +457
   System.ComponentModel.TypeConverter.ConvertFromInvariantString(String text) +43
   System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject) +495
   System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeMain(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject) +145
   System.Web.Script.Serialization.ObjectConverter.ConvertDictionaryToObject(IDictionary`2 dictionary, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject) +858
   System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject) +66
   System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeMain(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject) +145
   System.Web.Script.Serialization.ObjectConverter.AssignToPropertyOrField(Object propertyValue, Object o, String memberName, JavaScriptSerializer serializer, Boolean throwOnError) +215
   System.Web.Script.Serialization.ObjectConverter.ConvertDictionaryToObject(IDictionary`2 dictionary, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject) +1153
   System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject) +66
   System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeMain(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject) +145
   System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer serializer, String input, Type type, Int32 depthLimit) +66
   System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(String input) +70
   Telerik.Web.UI.RadTabStrip.LoadPostData(String postDataKey, NameValueCollection postCollection) +234
   Telerik.Web.UI.RadDataBoundControl.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +45
   System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +734