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Javascript error on grouping

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Pierre-Antoine asked on 02 Dec 2008, 09:32 AM
Hello everyone,

I bind my radgrid with an object.
I set the grid in the code-behind (Columns + options of the grid in the Page_Load in an "if(!isPostBack)").
if (!IsPostBack) 
                RecordKeepingGrid.ShowGroupPanel = true
                RecordKeepingGrid.GroupingEnabled = true
                RecordKeepingGrid.AllowPaging = true
                RecordKeepingGrid.AllowSorting = true
                RecordKeepingGrid.AllowFilteringByColumn = true
                RecordKeepingGrid.AutoGenerateColumns = false
                RecordKeepingGrid.PagerStyle.Mode = GridPagerMode.NumericPages; 
                RecordKeepingGrid.PageSize = 20; 
                GridBoundColumn boundColumn2 = new GridBoundColumn(); 
                boundColumn2.UniqueName = "FieldNameRK"
                boundColumn2.DataField = "Field.Name"
                boundColumn2.HeaderText = "Field Name"
                boundColumn2.AllowFiltering = true
                boundColumn2.AllowSorting = true
                boundColumn2.AutoPostBackOnFilter = true
                boundColumn2.Groupable = true
                boundColumn2.Reorderable = true
                GridBoundColumn boundColumn = new GridBoundColumn(); 
                boundColumn.UniqueName = "StartDateRK"
                boundColumn.DataField = "startDate"
                boundColumn.HeaderText = "Start Date"
                boundColumn.DataType = Type.GetType("System.DateTime"); 
                boundColumn.AllowFiltering = true
                boundColumn.AllowSorting = true
                boundColumn.AutoPostBackOnFilter = true
                boundColumn.Groupable = true
                boundColumn.Reorderable = true
                GridBoundColumn boundColumn3 = new GridBoundColumn(); 
                boundColumn3.UniqueName = "TypeOperationRK"
                boundColumn3.DataField = ""
                boundColumn3.HeaderText = "Operation Type"
                boundColumn3.AllowFiltering = true
                boundColumn3.AllowSorting = true
                boundColumn3.AutoPostBackOnFilter = true
                boundColumn3.Groupable = true
                boundColumn3.Reorderable = true
                GridBoundColumn boundColumn4 = new GridBoundColumn(); 
                boundColumn4.UniqueName = "OperationNameRK"
                boundColumn4.DataField = ""
                boundColumn4.HeaderText = "Operation Name"
                boundColumn4.AllowFiltering = true
                boundColumn4.AllowSorting = true
                boundColumn4.AutoPostBackOnFilter = true
                boundColumn4.Groupable = true
                boundColumn4.Reorderable = true
                GridBoundColumn boundColumn5 = new GridBoundColumn(); 
                boundColumn5.UniqueName = "AreaRK"
                boundColumn5.DataField = "area"
                boundColumn5.HeaderText = "Area"
                boundColumn5.AllowFiltering = true
                boundColumn5.AllowSorting = true
                boundColumn5.AutoPostBackOnFilter = true
                boundColumn5.Groupable = true
                boundColumn5.Reorderable = true

And this is my method to bind my grid (I hide some private code):
long[] fieldsSelected = [..........].getFields(); 
            List<OR[....]> lstRk = new List<OR[....]>(); 
            if (fieldsSelected.Length != 0) 
                foreach (long id in fieldsSelected) 
                    foreach (OR[....] ork in rs.getR[....]ByIdField(id)) 
                MyGrid.DataSource = lstRk; 
I call this method in the Page_Load and when the fieldsSelected variable change (to update the grid).

When I group my data and I want to collapse them or sorting the group item, I've got a Javascript Error :
Sys.WebForms.PageRequestManagerServerErrorException: Sys.WebForms.PageRequestManagerServerErrorException: Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation. 

I try to put the EnableEventValidation at true but nothing change. If I put it at false, there's no error but nothing happened.

Do you have a solution to my problem.


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Telerik team
answered on 03 Dec 2008, 10:03 AM
Hello Pierre-Antoine,

I reviewed the code, and noticed that you are setting the datasource for the grid, and directly calling databind(). Please, keep in  mind that this is not a recommended approach. To make sure the control behaves as expected, please use either the NeedDataSource event handler, or a datasource object. This example demonstrates one possible approach.

the Telerik team

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