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WebGrid: disappearing columns and scrolling slider locked

handysurya2303@gmail.com — Thu, 15 Aug 2013 04:10:23 GMT

Hello Eric,

It has been fixed before. It seems the issue is back (regression). I need more time to replicate in a simple sample for this issue. Because the previous one that I raised in my old simple sample already worked well. Perhaps, need to cover another case.

Regards,
Handy

WebGrid: disappearing columns and scrolling slider locked

Eric — Tue, 13 Aug 2013 04:46:52 GMT

Regarding Slider bug issues, this has been fixed in 2011R1.

I just tested with 2012R2 trial and it is not fixed. Can you re-investigate please or tell me when it gets fixed?

WebGrid: disappearing columns and scrolling slider locked

Eric — Fri, 22 Jul 2011 03:45:18 GMT

Hi Handy,

Did you mean this event list?

WebGrid_PreInitialize
WebGrid_Initialize
Page_Load: Event loading of the current page
WebGrid_InitializeLayout: Layout initialization such as assigning static behavior, appearance and styles
WebGrid_InitializeDataSource: Data source initialization
WebGrid_PrepareDataBinding: Column structure retrieval and creation of necessary objects
WebGrid_Load: Indication of successfully preparation of data binding process and data populatingin all rows
<<ServerControl Events>> - if Page.IsPostBack: Execution of server control events such as Button1_Click
Page_PreRender
...
WebGrid_Load
WebGrid_PreRender
...
Page_SaveViewState
Page_Render
...
WebGrid_InitializeTable
WebGrid_InitializeColumn
WebGrid_InitializeRow
WebGrid_InitializeCell
...
WebGrid_Unload

If yes, I do know this very well, but it just lists the order, nothing else; no description. And also I expected to have this on your homepage (like earlier) and not only installed with the product somewhere.

And for the Control.PreRender event the (Microsoft) description only says:

Occurs after the Control object is loaded but prior to rendering.

Use this event to perform any updates before the server control is rendered to the page. Any changes in the view state of the server control can be saved during this event. Such changes made in the rendering phase will not be saved.

That's not really much information, as you write as well. So yes, please update the documentation (and put it to your homepage too).

Thanks, Eric

WebGrid: disappearing columns and scrolling slider locked

handy@intersoftpt.com — Thu, 21 Jul 2011 22:28:47 GMT

Hi Eric,

There is no much detail information about PreRender event. I will try to ask our developer regarding this information. For information, you can see our WebGrid server side sequence life cycle in our documentation (Features and Concepts>>Events>>Event sequence of server side event).

Regards,
Handy

WebGrid: disappearing columns and scrolling slider locked

Eric — Thu, 21 Jul 2011 04:59:31 GMT

Hi Handy,

Thanks for your feedback. This workaround looks much better. The original sample doesn't crash anymore when doing the same things. I have to test if anything else doesn't work anymore though, which might take some time, but from this change I don't expect any such problems.

So to summarize this in short: In the PreRender event it is forbidden to touch the grd.RootTable columns, or at least it is not reliable to touch them as they can disappear because they internally get overwritten by client content at this stage.

Is this behaviour documented somewhere? If not, please describe this in the PreRender event. Can you also add a link to that description in this thread please?

Thanks, Eric

WebGrid: disappearing columns and scrolling slider locked

handy@intersoftpt.com — Thu, 21 Jul 2011 02:52:39 GMT

Hi Eric,

Here is the reason why it is not said as bug.

When postback, it’s too early because the columns are then overridden with the setting which is sent from the client-side. That’s why Column D is gone.

To address this issue, there is others workaround.

 Private Sub InitializeColumns()
        Const cDataWidth As Integer = 80
        AddHiddenGridColumn(grdUpper, "Upper_Id", "Upper_Id")
        AddHiddenGridColumn(grdUpper, "Upper_Parent_Id", "Upper_Parent_Id")
        AddGridColumn(grdUpper, "Description", "Description", "Description", cWidthUpperDescription)
        AddGridColumn(grdUpper, "A", "A", "A", Nothing, Sorting.Yes, Nothing, cColorLeft, HorizontalAlign.Left, cDataWidth)
        AddGridColumn(grdUpper, "B", "B", "B", Nothing, Sorting.Yes, Nothing, cColorLeft, HorizontalAlign.Left, cDataWidth)
        AddGridColumn(grdUpper, "C", "C", "C", Nothing, Sorting.Yes, Nothing, cColorLeft, HorizontalAlign.Left, cDataWidth)
        AddGridColumn(grdUpper, "D", "D", "D", Nothing, Sorting.Yes, Nothing, cColorLeft, HorizontalAlign.Left, cDataWidth)
        grdUpper.RootTable.DataKeyField = "Upper_Id"
        grdUpper.RootTable.SelfReferencingSettings.ChildDataMember = "Upper_Parent_Id"
        grdUpper.RootTable.SelfReferencingSettings.Enabled = True
        grdUpper.RootTable.SelfReferencingSettings.ParentDataMember = "Upper_Id"
        grdUpper.RootTable.SelfReferencingSettings.ExpandColumnMember = "Description"
        grdUpper.RootTable.SelfReferencingSettings.LoadOnDemand = False
        grdUpper.RootTable.SelfReferencingSettings.ApplyChildSorting = True
    End Sub
 Protected Sub grdUpper_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles grdUpper.Init
        If (Not IsPostBack) Then
            InitializeColumns()
        End If
    End Sub
 Protected Sub grdUpper_Load(sender As Object, e As System.EventArgs) Handles grdUpper.Load
        If IsPostBack Then
            grdUpper.RootTable.Columns.Clear()
            InitializeColumns()
        End If
    End Sub

Regards,
Handy

WebGrid: disappearing columns and scrolling slider locked

handy@intersoftpt.com — Tue, 19 Jul 2011 02:31:05 GMT

Hi Eric,

I have forwarded your feedback to our developer. I will update to you when there is a progress regarding this issue or not.

Regards,
Handy

WebGrid: disappearing columns and scrolling slider locked

Eric — Tue, 12 Jul 2011 11:47:45 GMT

Hi Handy,

I looked at your code again. You moved the column creations from .Init to .PrepareDataBinding and added a RootTable.Columns.Clear before the creation. You also moved the footer code from the Page.Load to the grdLower_PrepareDataBinding. But the main change is that in SetColumnVisibility you check if column D exists and if not you just create it.

This can't be your proposed solution, right? If you create the columns and then later when you use them, one column suddenly disappears, you just recreate it? And then you tell me this was a bug in my code and not in your product?

Please fix this bug instead of providing me non-working workarounds.

Thanks,

Eric

WebGrid: disappearing columns and scrolling slider locked

handy@intersoftpt.com — Fri, 01 Jul 2011 04:12:53 GMT

Hello Eric,

Yes, I understand about our last conversation. But after investigate the issue deeply, our developer teams thinks that the error correctly come from the level code (Column D is null). Also, my latest changes is different from my previous posts.

Regards,
Handy

WebGrid: disappearing columns and scrolling slider locked

Eric — Tue, 21 Jun 2011 08:37:46 GMT

Hello Handy

There is no error in the code. I know that the column "D" is null. This is the bug. I want that the column "D" no longer randomly disappears. I am changing visiblity and stuff, but the column should always be accessible by servers-side code. The column may disappear on the client-side if it is not visible though, but never on the server-side.

In your new sample you modified the code. I do know that it is possible to write different samples that do work. But it is not the same sample anymore. We could now get into long discussions about requirements etc. but I just want the original sample to not crash anymore - with the unchanged code. (Or show me where I programmed something violating your specification. Point me to the documentation to what I didn't obey in this case.)

We had those requirements discussions already and finally you confirmed that it is a bug. Please read the thread again if you need to recall. I have a (bad) workaround already, but I need this bug fixed. Thanks.

WebGrid: disappearing columns and scrolling slider locked

Eric — Tue, 21 Dec 2010 05:24:16 GMT

Hi,

I have created a demo-project for you which shows the problems. Please see attached ZIP.

Please include the Intersoft framework 3.0.5000.705, WebGrid 6.0.7200.220, System.Web.Extensions.dll 1.0.61231.0, AjaxControlToolkit.dll 1.0.10606.0, AJAXExtensionsToolbox.dll 1.0.61025.0 in order to get the same results. Please also set the .NET Target Framework to 2.0.

To reproduce the problem:

select in the dropdown "ABC" and click refresh button
in the upper WebGrid make the first column wider (resize it)
click on any row in the upper WebGrid

Now the application crashes trying to access grdUpper.RootTable.Columns.GetNamedItem("D"). Please note that the first column is only set to Visible=false, never it's missing.

Also, this only happens if the first column is resized. If not touching this, it works.

As an additional bug, in the lower grid the slider to move between different pages doesn't work. Only the + and - buttons move the slider.

My questions:

Can you confirm these two bugs?
Will there be a hotfix for it?
Do you know of any workaround possible?

Regards,

Eric