Sorry it was my fault; probably the renderer has been changed from v2 and v3 and reproducing the issue I have been able to found that it is about a javascript which didn't handle null values.
I post the codebehind to reproduce the issue, you can create a new vb web forms empty project and create a webform called GridTest.
in code behind paste this
in my original code was missing in line 99 return s==null?''
Imports Ext.Net
Public Class GridTest
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'Preparing data
Dim tbl As New DataTable
tbl.Columns.Add("id", System.Type.GetType("System.Int32"))
tbl.Columns.Add("txt", System.Type.GetType("System.String"))
tbl.Columns.Add("dat", System.Type.GetType("System.DateTime"))
tbl.Columns.Add("time", System.Type.GetType("System.TimeSpan")) 'Removing this column it works
tbl.Columns.Add("txt2", System.Type.GetType("System.String"))
Dim row As DataRow = tbl.NewRow
With row
.Item("id") = 1
.Item("txt") = "text"
.Item("dat") = Now
.Item("txt2") = "text #2"
End With
tbl.Rows.Add(row)
Dim row2 = tbl.NewRow
With row2
.Item("id") = 2
.Item("txt") = "new text"
.Item("dat") = DBNull.Value
.Item("txt2") = "new text #2"
End With
tbl.Rows.Add(row2)
'Preparing model
Dim m As New Model
For Each c In tbl.Columns
Dim mf As New ModelField
Dim mft As ModelFieldType
Select Case c.DataType.ToString
Case "System.Boolean"
mft = ModelFieldType.Boolean
Case "System.Int32"
mft = ModelFieldType.Int
Case "System.DateTime"
mft = ModelFieldType.Date
Case "Systtem.Decimal"
mft = ModelFieldType.Float
Case Else
mft = ModelFieldType.String
End Select
mf.Name = c.ColumnName
mf.Type = mft
mf.NullConvert = True
'UseNull = True 'v2
mf.AllowNull = True 'v3
mf.SubmitEmptyValue = EmptyValue.Null
m.Fields.Add(mf)
Next
'Preparing Store
Dim s As New Store
s.ID = "TableStore"
s.AutoLoad = True
s.Model.Add(m)
'Preparing the Grid
Dim grd As New GridPanel
grd.Height = 200
grd.Width = 500
Dim rowSelector As New ImageCommandColumn With {.Width = 25, .Resizable = False, .Align = Alignment.Right}
rowSelector.Commands.Add(New ImageCommand With {.Icon = Ext.Net.Icon.Disk})
'Adding columns
For Each c As DataColumn In tbl.Columns
Dim col As ColumnBase
Select Case c.DataType.ToString
Case "System.Boolean"
col = New CheckColumn With {.Text = c.Caption, .DataIndex = c.ColumnName, .Align = Alignment.Center}
Case "System.Int32"
col = New NumberColumn With {.Text = c.Caption, .DataIndex = c.ColumnName, .Align = Alignment.Right, .Format = "0"}
Case "System.DateTime"
col = New DateColumn With {.Text = c.Caption, .DataIndex = c.ColumnName, .Format = "dd/m/Y"}
Case "System.TimeSpan"
col = New DateColumn With {.Text = c.Caption, .DataIndex = c.ColumnName, .Renderer = New Renderer With {.Fn = "function(s) {return s==null?'':s.substr(0,s.length - 3)}"}}
Case "System.Decimal"
col = New NumberColumn With {.Text = c.Caption, .DataIndex = c.ColumnName, .Align = Alignment.Right, .Format = "0.00"}
Case Else
col = New Column With {.Text = c.Caption, .DataIndex = c.ColumnName}
End Select
grd.ColumnModel.Columns.Add(col)
Next
grd.Store.Add(s)
grd.Store(0).DataSource = tbl
'Adding controls
Dim rm As New ResourceManager
Me.Controls.Add(rm)
Me.Controls.Add(grd)
End Sub
End Class
