[13.2] Occasionally visibility is set to "hidden"

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bernhardus posted over 10 years ago

Hi,

occasionally the visibility of the WHDG in one of our pages is set to "hidden", although the grid is present and has data rows. I can make the grid visible via firebug and everything is fine; therefore there should be no problem and no reason to make the grid invisible.

There is one error shown in the javascript debugger: "TypeError: this._scrollStyleSheet is null", nothing else.

The grid is placed inside a WebDialog control. I can close the dialog and reopen it, but the grid stays invisible. I have to restart either the application or the browser to make the grid visible again; clearing the browser chache does not work.

It seems that in version 12.1 an at least similar problem occured (see http://ko.infragistics.com/community/forums/p/69972/354306.aspx#354306 "infragistics is setting webdatagrid to visibility:hidden - version 12.1").

Is this a known bug and if so does a workaround exist?

Is there an easy way for a user to make the grid visible (i. e. not via firebug but via button click, javascript etc.)?

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Offline [Infragistics] Michael H. posted over 10 years ago

Hello Bernhardus,

Thank you for posting in our forums!

As Dave mentions in the forum thread you linked to, the WebDataGrid/WebHierarchicalDataGrid initially renders invisible to perform some calculations without affecting the appearance of the page. Once the calculations finish, we reset the visibility. In this case, the javascript error you are receiving is interrupting our calculations and preventing the visibility from resetting.

After some initial research, this error appears to be related to the ColumnFixing behavior. Could you please provide me with the following information to determine the cause of this:

1.) What properties do you have enabled on the WebHierarchicalDataGrid, particularly pertaining to your behaviors. Would you be able to provide the markup/code you are using for the grid?

2.) Are you receiving any HTTP errors with your network traffic while the page is loading?

3.) You said you are closing and opening the dialog and that the grid is visible after restarting the application or browser. Is the WHDG visible when you originally open the WebDialog? Could you please clarify the steps to reproduce this to better help me understand how to reproduce this?

Looking forward to hearing from you.
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bernhardus posted over 10 years ago in reply to [Infragistics] Michael H.
Hi,

first of all I have to correct myself - in fact it is a WebDataGrid which is causing the problems, not a WebHierarchicalDataGrid. We once used the WHDG in this dialog, but for some reason we now use WDG. Sorry. Do we have to / is it possible to reassign this thread to the WDG discussion group?

Nevertheless, the page in question has a grid showing items which can be ordered. The user selects one or more items (data rows) and then opens the order dialog, which contains a WebTab with two tabs, the first one with a WebDataGrid showing the items the user had selected, the second one showing a WebDataGrid displaying material already in store which the user can decide to take instead of ordering new material. The second tab is disabled (not invisible) if there is no appropritate material in store, otherwise it is activated when the dialog opens. The grid on the second tab is sometimes invisible although it should not.

Concerning your questions:

1) The following behaviours are enabled (in code-behind):

ColumnFixing, ColumnMoving, ColumnResizing, Filtering, Sorting, RowSelectors, Selection (with CellSelectType Multiple, CellClickAction Row, ColumnSelectType None, RowSelectType Multiple).

AutoGenerateColumns is false.

2) There are no http errors. But there are lots of CSS hints in jquery.ui.custom.css and ig.ui.min.css like

Unknown property '-moz-border-radius'. Declaration dropped.

Selector expected. Ruleset ignored due to bad selector.

etc.

Also there is a SyntxError in ig.ui.min.js:

Using //@ to indicate sourceMappingURL pragmas is deprecated. Use //# instead

followed by an Error:

http://xxx/Scripts/ig.ui.min.js is being assigned a //# sourceMappuingURL, but already has one

Loading the dialog which contains the grid is no problem. If the grid is visible there is no error. If the grid is invisible there is the TypeError which I mentioned.

3) I know this is not what you would like to read (it's not what I'd like to read, for sure), but: I can't clarify the steps, because the error can be reproduced only erratically.

As far as I know the error does not occur when I open the dialog for the first time after browser or application restart. But maybe I didn't try enough.

The error occurs erratically after the dialog was opened several times. Several times means a range between 2 or 3 up to 50 or more, using always the same data or different data. After a user had informed me for the first time I tried about 30 minutes until I could reproduce the behaviour.

We are using Firefox as default browser (release >= 25). Some users have the ability to switch the rendering engine to Internet Explorer inside Firefox. If they do in case of the error then the error does not occure with IE engine (which makes sense since it's like a browser restart), but it occures again when they switch back to Firefox engine. I did not test if the error ever occures when using IE.

This is the WebTab containing the grids:

<ig:WebTab ID="ItemsWT" runat="server" Width="100%" Height="250px">
    <Tabs>
        <ig:ContentTabItem runat="server">
            <Template>
                <ig:WebDataGrid ID="DlgSelectedItemsWDG" runat="server" Height="98%" Width="99%" >
                </ig:WebDataGrid>
            </Template>
        </ig:ContentTabItem>
        <ig:ContentTabItem runat="server">
            <Template>
                <ig:WebDataGrid ID="DlgSurplusItemsWDG" runat="server" Height="98%" Width="99%">
                </ig:WebDataGrid>
            </Template>
        </ig:ContentTabItem>
    </Tabs>
</ig:WebTab>
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