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Dual Listbox Funcationality Multi-Select Error

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

Todd asked on 24 Feb 2012, 04:24 PM

I'm trying to implement dual listbox functionality that is nearly identical to the AJAX version of the code sample provided by Telerik:

http://www.telerik.com/community/code-library/aspnet-ajax/grid/dual-listbox-functionality.aspx

However, I need to be able to select multiple rows to move between the two listboxes instead of one at a time as the sample does.

If I set AllowMultiRowSelection = true for both grids and then attempt to move all items form one grid to the other, I get a JavaScript error.:

Line: 4083

Error: Sys.ArgumentUndefinedException: Value cannot be undefined.

Parameter name: element

The file that is throwing the error appears to be a Microsoft AJAX related scripting file:

// Name: MicrosoftAjax.debug.js

// Assembly: System.Web.Extensions

// Version: 4.0.0.0

// FileVersion: 4.0.30319.225

//-----------------------------------------------------------------------

// MicrosoftAjax.js

// Microsoft AJAX Framework.

It appears that some part of the AJAX scripting doesn't like it that one of the grids suddenly has no records. I tried implementing buttons that move all items form one grid to the other via the code behind, and the JavaScript error still shows up.

Is there a fix or work around for this? I haven't been able to find one yet :-(

Dual Listbox Funcationality Multi-Select Error

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