Posts tagged: trick

Infragistics WebDataMenu delayed resizing in Chrome

By , August 1, 2014 4:36 pm

I encountered weird issue using Infragistics ASP.NET WebDataMenu control. If total width of top-level items was bigger than menu’s width and scrolling kicked in – Google Chrome browser produces unexpected results.

Consider following basic markup for Infragistics WebDataMenu:

<ig:WebDataMenu ID="WebDataMenu1" runat="server" Width="300px">
   <ClientEvents Initialize="myInit" />
   <GroupSettings Orientation="Horizontal" />
   <Items>
      <ig:DataMenuItem Text="Root Item"></ig:DataMenuItem>
      <ig:DataMenuItem Text="Root Item"></ig:DataMenuItem>
      <ig:DataMenuItem Text="Root Item"></ig:DataMenuItem>
      <ig:DataMenuItem Text="Root Item"></ig:DataMenuItem>
      <ig:DataMenuItem Text="Root Item"></ig:DataMenuItem>
      <ig:DataMenuItem Text="Root Item"></ig:DataMenuItem>
      <ig:DataMenuItem Text="Root Item"></ig:DataMenuItem>
      <ig:DataMenuItem Text="Root Item"></ig:DataMenuItem>
      <ig:DataMenuItem Text="Root Item"></ig:DataMenuItem>
      <ig:DataMenuItem Text="Root Item"></ig:DataMenuItem>
   </Items>
</ig:WebDataMenu>

It’s a pretty basic markup that defines 10-item horizontal menu with a limited width, so scrolling is enabled. Code in the Initialize event handler would handle some calculation based on menu dimensions and other items on the page would be affected by these calculations. Continue reading 'Infragistics WebDataMenu delayed resizing in Chrome'»

Infragistics WebDataMenu flashes unexpected color on hover

By , July 17, 2014 2:44 pm

WebDataMenu
Infragistics WebDataMenu ASP.NET control comes both with predefined stylesets and allows you granularly overwrite any of the styles. For example definition like this

<ig:WebDataMenu ID="xmyMenu" runat="server" StyleSetName="Office2007Blue"
                 CssClass ="topMenuStyle" >
   <GroupSettings Orientation="Horizontal" />
   <ItemSettings CssClass="itemCssStyle" 
                 HoverCssClass="hoverCssStyle" 
                 SelectedCssClass="selectedCssStyle" />  
</ig:WebDataMenu>

will create a horizontal dropdown menu in default “Office 2007 Blue” styleset but allows you to overwrite individual styles via exposed CSS properties.

Let’s take a look at hover style. Continue reading 'Infragistics WebDataMenu flashes unexpected color on hover'»

How to receive Stack Overflow notifications on your phone and smartwatch (v 2.0)

By , May 21, 2014 1:59 pm

StackOveflow Pebble UpdateA while back I described how you can receive Stack Overflow notifications on your phone and smartwatch by reading RSS feed provided by StackOvedlow API (v1) and connecting it to PushOver push notification service (and their Android app and ultimately Pebble Smartwatch via awesome IFTTT.

Since then Stack Exchange retired version 1 of their API (and besides it didn’t provided all the information needed, e.g. total reputation points) so I was looking for an alternative. Fortunately StackOverflow API v2 provides very extensive set of functions. One call I was looking for is

api.stackexchange.com/2.2/users/[userid]?site=[site]

Where [userid] is your Stack Exchange User ID and [site] is the Stack Exchange site you’re interested in. For example for me call to

https://api.stackexchange.com/2.2/users/961695?site=stackoverflow

provides a nice JSON output: Continue reading 'How to receive Stack Overflow notifications on your phone and smartwatch (v 2.0)'»

How to make “scrollIntoView” apply to IFRAME only

By , January 6, 2014 5:05 pm

Let’s say you have a really long HTML page with scrollbars, for the sake of argument something like this:

<div>aaaa</div>
<div>aaaa</div>
<div>aaaa</div>
...more content...
<div id="xB">bbbb</div>
<div>aaaa</div>
<div>aaaa</div>
<div>aaaa</div>
...much more content...

And somewhere, perhaps on pageload, you want to make sure that highlighted element is visible to the user, so to scroll it into view you execute

document.getElementById("xB").scrollIntoView();

And it works fine and well – the needed element is automatically displayed on top of the page. But what if this page is in an IFRAME and the parent page has a large scrollable content of it’s own:
Continue reading 'How to make “scrollIntoView” apply to IFRAME only'»

Infragistics WebSplitter: Set SplitterBar’s CSS class in clinet-side JavaScript

By , December 4, 2013 12:36 pm

Hello there. Haven’t written in a while, been busy participating in Stack Overflow community, but this little bit I found interesting.

Infragistics has a cool versatile Web Splitter control in their ASP.NET suite, but recently I encountered a shortcoming – there’s no way to set a CSS class for splitter bar on client-side via JavaScript. On server-side you can do something like

xMySplitter.SplitterBar.CssClass = "hiddenElement";

On client-side – you can get the CSS class via

var sCss = $find('xMySplitter').get_splitterBarCss()

but there’s no counterpart set_splitterBarCss() method. Continue reading 'Infragistics WebSplitter: Set SplitterBar’s CSS class in clinet-side JavaScript'»

ADO.NET DataTable: Change Column DataType after table is populated with data

By , August 2, 2013 10:44 am

Sometimes there is a need to change DataType of ADO.NET DataTable column. If your table is populated as a result of some database operation – you don’t know in advance what type the columns will be. And by design you cannot change the type of the column after the table is populated. Conudrum. Catch 22. Tough luck.

But wait, there’s light at the end of the tunnel. You cannot change the type of the existing column, but you can create a new one. Continue reading 'ADO.NET DataTable: Change Column DataType after table is populated with data'»

Disable WebDataTree in client-side JavaScript

By , May 21, 2013 4:12 pm

Let’s say you’re using Infrafitics WebDataTree’s server-side SelectionChanged event to perform some action when user selects a tree node. Now let’s say there’re times when you need to disable tree-selection (for example another control, e.g. WebDataGrid is being updated and clicking tree node during update will mess things up). Also you need to do it in client-side JavaScript (e.g. if that second control is inside of UpdatePanel – server-side updates will not affect controls outside the panel).

What to do? WebDataTree doesn’t have CSOM set_enabled() method and if you use client-side DOM’s:

$find('xMyTree').get_element().setAttribute('disabled','true');

tree may take appearance of being disabled in some browsers, but user can still select nodes.

Fortunately there is a solution (thanks Bhadresh from Infragisitcs techsupport for suggesting it). WebDataTree has SelectionType property (0 = None, 1 = Single, 2 = Multiple) that controls how many nodes can be selected in the tree. It also has a counterpart in client-side JavaScript set_selectionType(), so in order to disable selection simple use command

$find('xMyTree').set_selectionType(0);

Later on selection can be re-enabled either by passing 1 to above function or even server-side by calling

xMyTree.SelectionType = NavigationControls.NodeSelectionTypes.Single

Access your PC files remotely via SkyDrive on mobile device

By , April 30, 2013 1:07 pm

If you use Microsoft Skydrive application on your Windows machine, you know that besides syncing local dedicated Skydrive folder to the cloud it allows accessing your PC files directly (without uploading them to the cloud) from remote location. Unfortunately this feature is available for desktops only, mobile apps are “by design” missing it.

But what prevents you from logging into Skydrive Website directly from a mobile Web browser?

Skydrive In Mobile Chrome

After authorizing yourself with security code you’re in! Albeit this is not as convenient as a native app would be, but until “design” changes this approach allows you to access your PC’s files without installing any additional software on the PC and without downloading any additional app to the device.

Solution for WebHierarchicalDataGrid’s “Async request failed” error

By , April 29, 2013 4:28 pm

This is a solution for specific (and maybe somewhat obscure, but it helped me, so perhaps it will be helpful to someone else) scenario for Infragistics’ WebHierarchicalDataGrid error “Async request failed“.

It could be accompanied by inner errors

Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request

or more generic

Object Reference not set

In this particular scenario WHDG uses manual LoadOnDemand for to populate children (i.e. RowIslandPopulating event is used) and parent grid is sorted by one or more columns. Error is happening when attempting to expand second child or a grandchild. Continue reading 'Solution for WebHierarchicalDataGrid’s “Async request failed” error'»

Infragistics WebTab: Simulating SelectedIndexChanging event when programmaticaly changing tabs via set_selectedIndex

By , April 4, 2013 4:14 pm

Infragistics WebTab control is very versatile and offers rich server- and client-side model. Among client-side events are

  • SelectedIndexChanged – fires after user has changed the tab to provide ways to interact with newly selected tab
  • SelectedIndexChanging – fires before user has changed the tab to provide ways to interact with currently selected tab and to give user a chance to cancel change.

Both work fine if user manually changes tabs by clicking on tab headers, but call to client-side set_selectedIndex() function (which changes tabs programmaticaly) only fires SelectedIndexChanged, skipping SelectedIndexChanging altogether. But there’s a way to make it work.
Continue reading 'Infragistics WebTab: Simulating SelectedIndexChanging event when programmaticaly changing tabs via set_selectedIndex'»

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