• Home
  • About
  • Resume

Droid Moon

By , 12/28/2012 5:26 PM

Got Celestron 21024 FirstScope Telescope for Xmas.

La Luna

This pic was taken with Droid 3 phone.

Infragistics WebDataMenu last item disappears

By , 12/28/2012 1:14 PM

While using Infragistics WebDataMenu control from their NetAdvantage for ASP.NET Suite (version 2012.2, current as of this post) I noticed that last menu item in horizontal menu disappears. To me this only happened in Firefox.

Disappearing Act

This post suggested to set EnableScrolling menu property to False as a solution. Which is fine and well, but did not work for me since I need my menu to scroll (it has limited width available and menu items are added programmatically in code-behind so total items width can be wider than width available for the menu).

Continue reading 'Infragistics WebDataMenu last item disappears'»

Infragistics WebDataGrid: Hidden columns become visible after AJAX postback

By , 12/12/2012 11:30 AM

A recent update to .NetAdvantage for ASP.NET v12.2 introduced a weird bug – hidden columns of WebDataGrid and WHDG become visible after postback. Service release 12.2.20122.2031 fixed that issue – but only for full postback. Under some circumstances if grid performs an AJAX call (sorting, paging etc.) hidden columns become visible again. This does not happen in IE, but other browsers, such as Chrome and FireFox do exhibit the issue.

This is happening because hidden columns lose “display:none” property in their style. If this happens to you – you have to take matter in your own hands. Continue reading 'Infragistics WebDataGrid: Hidden columns become visible after AJAX postback'»

Infragistics WebDataMenu: Enable client-side resize with scrolling

By , 12/10/2012 11:32 AM

Infragistics WebDataMenu control for ASP.NET has a neat feature: if items for horizontal menu don’t fit in allocated width – it automatically adds scroll buttons:

Scrolling in WebDataMenu

Unfortunately this works only if you set menu width in ASPX markup or server-side code. But what if menu is built dynamically and you don’t know in advance how many items there will be. Or if user resizes browser window and available width changes?

We need to be able to set menu width in client-side JavaScript code. Also we need to check whether all items fit into menu width and if not – enable scroll buttons – on demand. The code below does just that. Continue reading 'Infragistics WebDataMenu: Enable client-side resize with scrolling'»

Solution for: Value of type ‘System.Web.UI.HtmlControls.HtmlGenericControl’ cannot be converted to ‘System.Web.UI.HtmlControls.HtmlTableRow’ error

By , 11/08/2012 1:14 PM

If you’re trying to compile an ASP.NET project/website in Visual studio 2012 or 2010 and getting error:

Value of type ‘System.Web.UI.HtmlControls.HtmlGenericControl’ cannot be converted to ‘System.Web.UI.HtmlControls.HtmlTableRow’

chances are you have an HTML table in your ASPX markup with runat="server" attribute set and <tbody> or <thead> tags present. Remove <tbody> and <thead> tags and the error should go away.

WebDataTree: Use custom images for Expand/Collapse

By , 10/02/2012 11:31 PM

Infragistics WebDataTree control offers variety of styles via supplied StyleSets and each StyleSet has its own Expand/Collapse images for tree branches. Unfortunately the control doesn’t offer built-in way to use your own expand/collapse images, to achieve that you need to replace respective images in the StyleSet currently used by the tree.

But if you’re reluctant to go this way for whatever reason (you’re using your own style or don’t want to change canonical Infragistics style) there’s another way – purely client-side JavaScript.

Note: The method below assumes that all the levels the tree are fully rendered on the client. If you’re employing load-on-demand, the method will require some adjustments.

Place the code below in Tree client-side Init event:

function xwdTree_Init(sender, eventArgs) {
   /// <summary>
   /// Fires when tree is initialized
   /// </summary>

   //{******* Replacing Expand/Collapse images in the tree with custom ones

   // Looping thru images in the tree itself
   var aTreeImages = sender.get_element().getElementsByTagName('img');
   
   for (I = 0; I < aTreeImages.length; I++) {
      if (aTreeImages[I].src.indexOf('Plus') != -1) aTreeImages[I].src = 'images/my_expand.png'
      else if (aTreeImages[I].src.indexOf('Minus') != -1) aTreeImages[I].src = 'images/my_collapse.png'
   }

   // Looping thru images in hidden div used for replacement after click
   var aTreeActionImages = $get(sender.get_id() + '_Images').getElementsByTagName('img');
   
   for (I = 0; I < aTreeActionImages.length; I++) {
      if (aTreeActionImages[I].src.indexOf('Plus') != -1) aTreeActionImages[I].src = 'images/my_expand.png'
      else if (aTreeActionImages[I].src.indexOf('Minus') != -1) aTreeActionImages[I].src = 'images/my_collapse.png'
   }

   //******* Replacing Expand/Collapse images in the tree with custom ones }
        
}

Take a look at Lines 8-14. This code locates Tree control and its respective DOM element. Then it loops thru all the images inside. If it’s an “expand” image (has the word “plus” in its name) – we replace it with our custom expand image. If a tree node already rendered expanded – the code will locate “collapse” image (which has the word “minus” in its name).

This is all good and well for currently rendered nodes. But when you start expand and collapse nodes – images are replaced dynamically (“expand” becomes “collapse” when node is expanded and vice-versa) by Infragistics code. If you only execute code in Lines 8-14 and then expand or collapse tree nodes – your images will get replaced with Infragistics original ones from their secret repository.

Fortunately that secret repository is a plain hidden DIV with the ID “yourTreeID_Images”. Take a look at Lines 16-22. This code locates the DIV that holds replacement images and replaces them with our own similarly to Lines 8-14. After it ran, when Infragistics code needs to grab an image to replace expand/collapse one – it will get yours.

As a result Tree is rendered (both statically and dynamically) with your own beautiful images.

WHDG: Position “Group by” area anywhere on the page

By , 09/28/2012 9:17 PM

WebHierarchicalDataGrid grouping feature offers handy “Group By” area – a place where columns can be dragged to for grouping. It has one limitation though: by default it can be positioned only on top or the bottom of the grid. But what if you want to place it elsewhere? For example you have a dedicated navigation part of your page where you want to display grouped columns.

DOM to the rescue. As I mentioned in my previous post Group By area is a DIV that can be located by its CSS class name (either assigned by you or, barring that, class of a StyleSet used by the grid control). After the area is located, it can be moved to a location of your choice, for example another DIV by standard appendChild DOM method:

function positionGroupByArea() {
   var aGroupAreas = document.getElementsByClassName('ighg_Office2007BlueGroupArea'); 
   var oDivActionControls = $get('xdivNavigation'); 

   if (aGroupAreas.length > 1) {
      oDivActionControls.removeChild(aGroupAreas[0]);
      oDivActionControls.appendChild(aGroupAreas[1])
   } else {
      oDivActionControls.appendChild(aGroupAreas[0])
   }
}

Lines 2-3 Locate Group By area and target DIV respectfully. Note Line 5: like nature abhors a vacuum – WHDG abhors Group By area missing from its default place, if it is missing – grid will try to recreate it. If this happens you will have 2 Group By areas. If code on Line 5 detects this situation it removes old area and re-adds new one. Otherwise it simple moves original area.

You will have to call this code on initial grid load and after every grid operation (sorting, paging etc.) since grid will try to recreate Group By at the old place. Also, if the grid feels jumpy during this move – hide Group By area initially via it’s CSS class by setting display:none and make it visible again after the move.

Overall effect is quite seamless

WHDG: Give Grouped columns correct captions

By , 09/28/2012 4:42 PM

If you work with Infragistics WebHierarchicalDataGrid and try to use its grouping features, you may notice that it uses grid column keys instead of column header’s captions to name items in “Group By” area.

To work around this limitation, let’s take a look at how Grouped By area is rendered:

Group By Area in WebHierarchicalDataGrid

Basically a container DIV holds a bunch of SPANs representing grouped columns. Both DIV and SPAN can be located by their CSS class (your own, if it’s assigned or Infragistics StyleSet class name, used by the grid control). Knowing the location of the SPANs we can loop thru them altering their text:

function renameColumnsInGroupByArea() {

   //locating GroupBy area DIV 
   var oGroupArea = document.getElementsByClassName('ighg_IGGroupArea')[0]; 

   //locating GroupedColumn SPANs
   var aGroupedColumns = oGroupArea.getElementsByClassName('ighg_IGGroupedColumn');

   // looping thru SPANS with grouped columns, replacing their text
   for (var I = 0; I < aGroupedColumns.length; I++) {
      aGroupedColumns[I].firstChild.nodeValue = // put your new value here;
   }
}

One way of using this function is generate a JavaScript associative array (ColumnData['ColumnKey'] = 'Column Caption') in ASP.NET server side code. Armed with such array Line 11 in the previous code could be simple

aGroupedColumns[I].firstChild.nodeValue = ColumnData[aGroupedColumns[I].firstChild.nodeValue]

Sync NEW files from external folders to Skydrive

By , 09/11/2012 2:40 PM

Skydrive
If you use Microsoft Skydrive cloud storage, you know it has a neat desktop client that automatically syncs content of a desktop folder to the cloud. It uses its own dedicated folder, but if you have existing folders that accumulated photos and music for decades – there’s an easy way to add them as well.

The problem with this approach – Skydrive client will happily sync existing files, but will pass on any new ones added after initial sync. This happens because it cannot detect changes in symlinked folders. If you regularly shutdown/startup your machine – it’s not a problem, when client is restarted it rescans entire content for the changes – and follows symlinks as well.

But if your machine is “always on” e.g. a server there is an easy way as well. Just create an empty folder inside of a “real” Skydrive folder and delete it right away. This, similar to restart, will force Skydrive client to rescan entire content and sync with the cloud. Folder creation can be automated (a batch run on schedule for example) so you will always be in sync.

Run Adobe Flash Player on Android 4.1 Jelly Bean (and above)

By , 09/11/2012 2:18 PM

It is a well known fact that Adobe is willingly shooting itself in the foot stopped supporting flash on Android devices. If you run Android 4.1 (Jelly Bean) it is not even available on the Google Play. Oh and speaking of Google – unlike its desktop counterpart Chrome for Android doesn’t support Flash either.

So.. is this the end of the era?

Fear not. Just download and install this handy Flash APK and install it on your device. Voila! Your mighty tablet/phone now has Flash. It still won’t work in Google Chrome, but other browser (Stock, Dolphin) will happily use it.

Panorama Theme by Themocracy