Tag Archives: bug

UltraWebGrid strange behavior in IE8 when IE=EmulateIE7

If you’re using Infragistics UltraWebGrid in Internet Explorer 8 you may experience strange visual (and other) issues if you have page compatibility set to emulate IE7, e.g.

<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />

Issues can range from column moving not working to weird distortion in grouped mode. According to Infragistics this combination is not supported as “unstable”, but you can still make it work.

Infragistics keeps internal flags of what browser is currently in use: ig_shared.IsIE7, ig_shared.IsIE8, etc. The trick is to detect IE8 and make it fall back to IE7:

if (ig_shared.IsIE8) {
    ig_shared.IsIE8 = false;
    ig_shared.IsIE7Compat = true;

Place this code on top of your page JavaScript code and when it sees IE8 it will tell grid to use IE7 rendering. This is most definitely a hack, but it works.

UltraWebGrid: “Input string was not in a correct format” error while setting width of a column

Infragistics UltraWebGrid allows you to set width of a column in client-side JavaScript, you can do it using code similar to this:


But, while executing this code on the client, you may get a nasty surprise by getting following error from the server:

Input string was not in a correct format.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.FormatException: Input string was not in a correct format.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[FormatException: Input string was not in a correct format.]
System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +10163939
System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +207
Infragistics.WebUI.UltraWebGrid.StateChangeProcessor.ProcessChanges() +6230
Infragistics.WebUI.UltraWebGrid.UltraWebGrid.ProcessChanges(StateChanges stateChanges, Boolean fireEvents) +701
Infragistics.WebUI.UltraWebGrid.UltraWebGrid.LoadPostData(String postDataKey, NameValueCollection values) +7580
System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +945
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2071

Now, you do know that your someValue is definitely a number, why this error then? Let alone – why client-size resize causes a server call? But I will leave this to Infragistics. Actual cause of the error – number not being Integer. If you change the code from above to


it will execute without any errors. Go figure.

WebDataTree returns multiple selected nodes in single-select mode

This could be a bug in Infragistics WebDataTree control or it could be a very specific scenario (maybe it’s even by design, I don’t know) but here’s a weird behavior that I encountered. Using following code in WebDataTree’s event handler (oh and by the way, tree control is in a single-select mode):

Protected Sub xMyTree_SelectionChanged(ByVal sender As Object, ByVal e As NavigationControls.DataTreeSelectionEventArgs) Handles MyTree.SelectionChanged
   if e.NewSelectedNodes(0).Text = "Some Value"
      'do something with newly selected tree node
   end if
End Sub

I intended to use newly selected node to perform some operations. To my surprise e.NewSelectedNodes(0) referred to previously selected node (despite the name of the property) and newly selected value were located in e.NewSelectedNodes(1)! So the quick workaround was to use slightly modified code:

Protected Sub xMyTree_SelectionChanged(ByVal sender As Object, ByVal e As NavigationControls.DataTreeSelectionEventArgs) Handles MyTree.SelectionChanged
   if e.NewSelectedNodes(e.NewSelectedNodes.Count-1).Text = "Some Value"
      'do something with newly selected tree node
   end if
End Sub

This way it will always get latest selected node and the solution is universal. If the bug described above occurs – code will grab e.NewSelectedNodes(1) (because Count = 2). If the tree behaves as expected – code will get grab e.NewSelectedNodes(0) (because Count = 1)

Solution for WebHierarchicalDataGrid “DataKeyField is invalid” error

If you’re using Infragistics WebHierarchicalDataGrid and getting “DataKeyField is invalid” error after assigning DataKeyFields property for the root level:

xMyGrid.DataKeyFields = "[Key 1],[Key 2],[Key 3]"

and trying some data manipulation (like deleting rows, binding data etc.), try using GridView property of the grid instead:

xMyGrid.GridView.DataKeyFields = "[Key 1],[Key 2],[Key 3]"

The first method used to work, but somewhere around 2011 release of NetAdvantage it broke.

WebDataGrid: Prevent scrolling on row selection

If you working with Infragistics Aikido controls and your WebDataGrid or WHDG is too long – a common approach to make content scrollable is to place grid control inside of a DIV with fixed dimensions and overflow set to auto:

WHDG scrollable inside of parent DIV

It works fine, but there’s one drawback: if you scroll your grid horizontally and then select a row – grid’s scroll position snaps back to the leftmost position. Infragistics says that it’s a browser bug and we need to talk to browser vendor about it. Wanting to solve the problem in this century I looked for alternatives and this is what I found. Continue reading →

CyanogenMod on Kindle Fire

CyanogenMod on Kindle Fire Lately I’ve been posting a lot about Kindle Fire and no wonder – I love this tablet and tweaking with it.

Today I went to tweaking extreme – installed a custom ROM, namely CyanogenMod. CyanogenMod is famous for being a better replacement ROM for a wide multitude of Android devices from Droid phones to Nook tablets. And finally it made its way to Kindle Fire. Installing it turned out to be surprisingly easy – first, using Kindle Fire Utility root your Fire and install TWRP Recovery – very useful instrument not only for installing new ROMs but also for backing up and restoring your existing one in case something goes wrong. Second, download latest CyanogenMod in form of “update.zip” and place into temp/download folder of your Fire. And lastly reboot into TWRP recovery, browse for the ZIP and install it.

CyanogenMod didn’t let down, it was perfect as usual – fast, highly customizable, this one specifically build for Fire with its lack of hardware buttons. It has many wonderful features (for example picture in this post is, unlike previous posts, is a direct screenshot from my Fire, “take a screenshot” is one of the options appearing in menu when you press and hold power button).

It has everything. The only drawback for me is, for the love of it, I couldn’t make Amazon Instant Video app work in this mod. The issue is widely discussed on the Interwebs, multiple possible solutions are offered, but none worked for me. And since Prime Instant Videos is the only original Fire feature that I use – I had to return back to rooted stock Amazon ROM with ADW launcher (thanks TWRP for making ROM backup and recovery a very simple experience). Until working version of Amazon Instant Video is bundled with Cyanogen – I am keeping the stock.
Continue reading →

UltraWebGrid bug: Row is selected on mouse move

Submitted for your approval an UltraWebGrid with CellClickActionDefault=”RowSelect” and SelectTypeRowDefault=”Single” – an ordinary down-to-earth grid. It also posses event handler AfterSelectChangeHandler, also nothing out of the ordinary. But in a minute the aforementioned grid will exhibit properties most unusual. As the alert message ahead reads: Infragistics Bug Continue reading →

ClientScript.RegisterStartupScript: script injected, but not executed

This was one weird mystery. I have used ASP.NET’s method ClientScript.RegisterStartupScript countless times to inject client-side JavaScript into page’s markup from the server-side code and it always worked perfectly. This time I created a very basic page from scratch:

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>My Page</title>
    <script type="text/javascript" src="script1.js" />
    <script type="text/javascript" src="script2.js" />
    <script type="text/javascript" src="script3.js" />
    <form id="xfrmMain" runat="server">

And then injected client-side script into it:

ClientScript.RegisterStartupScript(Me.GetType, "JSCode", "ProcessData();", True)

where ProcessData() is function from one of the scripts, loaded in the HEAD tag. The script injected just fine, I got a beautiful insert at the bottom of the rendered page:

<script type="text/javascript">

The problem was – it didn’d do squat – the script did not execute. Why? Continue reading →

WHDG: RowIslandsPopulating event fires multiple times

I’ve been successfully using manual load on demand in WebHierarchicalDataGrid for a while now, but recently noticed strange thing. The deeper in grid’s hierarchy I expanded the children – the slower it went.

In my case every time user clicks [+] to expand a row, VB.NET code calls an SQL Server Stored procedure to bring in child rows. I grew suspicious and fired up SQL Profiler. What I saw surprised me. Number of calls to the stored procedure increased the deeper in grid’s hierarchy I expanded the children. When I clicked [+] on the root level it resulted in 1 SP call. Clicking [+] on the child to expand grandchild – 2 calls. Expanding grandchild to see grand-grandchild rows – 3 calls, etc. Continue reading →

WebDataMenu: Incorrect displaying after upgrade

This is the second post in saga titled Upgrading Infragistics Controls to a new version. Chances are that your WebDataMenu looks weird after upgrade to 2010+ version. In my case the menu had following options/features:

  • It was a context popup menu, called on right mouse click
  • Text of menu items was assigned dynamically at runtime in JavaScript Client code

After upgrading NetAdvantage from version 2009.2 to 2011.1 strange things started to happen. Text of the menu items was cut short, submenues appeared at wrong places it looked like something from a Dali’s painting.
Numerous experiments later I found out that the problem was with EnableScrolling property of the menu control. Setting it to False returned menu to realm of realism.