• Home
  • About
  • Resume

Category: Infragistics

Copy/Paste image into an editable DOM element in Chrome

By , 09/11/2017 4:29 PM

All major browsers allow to paste image directly into a DOM element with contentEditable property set to true. They automatically convert it into IMG element with source pointing to base64 encoded DataURI of the pasted image. That is all browsers, but Chrome. Chrome needs a little help.

In my particular case I need to be able to paste image into an IFRAME with editable body of the content document (for some reason Infragistics WebHtmlEditor ASP.NET control renders itself as this contraption). But the code below applies (with small changes) to any editable DOM element.

To achieve the result we need to perform 3 tasks:

  1. Capture image from the clipboard
  2. Convert the image to DataURI format
  3. Create IMG element with the DataURI source and insert it into the DOM

Take a look at the code below: Continue reading 'Copy/Paste image into an editable DOM element in Chrome'»

Access nested controls in ASP.NET Page PreInit event (when no Master Page is involved)

By , 11/07/2014 4:34 PM

There’re situations when you need access ASP.NET web controls very early in page lifecycle, more specifically – in Page PreInit event – and you can, but only top-level controls. But what if you need to access child/nested controls? The example below uses Infragistics WebHierarchicalDataGrid as a child of Infragistics WebSplitter, but this pretty much applies to any such scenario.

Let’s say you have following layout

<ig:WebSplitter ID="WSP" runat="server">
   <Panes>
      <ig:SplitterPane runat="server">
         <Template>

            <ig:WebHierarchicalDataGrid ID="WHG" runat="server">
            </ig:WebHierarchicalDataGrid>

         </Template>
      </ig:SplitterPane>
      <ig:SplitterPane runat="server"></ig:SplitterPane>
   </Panes>
</ig:WebSplitter>

As you can see grid “WHG” is nested withing first pane of splittet “WSP. Let’s see what happens if you try access the controls in PagePreInit event: Continue reading 'Access nested controls in ASP.NET Page PreInit event (when no Master Page is involved)'»

Infragistics WebDataMenu: Manual postback from client-side Click event

By , 10/07/2014 1:46 PM

There’s a a few possible scenarios when you need to manually to initiate server-side Click event of Infragistics WebDataMenu control. For example in client side click event you do some verification/user confirmation and upon positive confirmation (e.g. user clicks YES) – server-side Click event should kick in.

In a normal flow of event you can use set_cancel(bool) method to allow/disallow natural menu postback e.g.

function Menu_ItemClick(sender, eventArgs) {

   if (confirm('Are you sure?'))
       eventArgs.set_cancel(false)
   else
       eventArgs.set_cancel(true)

}

This works because this dialog stops code execution waiting for the user input. But what if you use something like jQueryUI dialog that relies on callback functions to get user feedback? In this case execution of the code continues immediately so you have to cancel postback right away and instead in the callback of the dialog initiate manual postback e.g

function Menu_ItemClick(sender, eventArgs) {

   $("#dialog").dialog({
      resizable: false,
      height:140,
      modal: true,
      buttons: {
        "Yes": function() {
          $(this).dialog("close");
          __doPostBack(sender.get_id(), 'ItemClick' + eventArgs._getPostArgs());
        },
        "No": function() {
          $(this).dialog("close");
        }
      }
   });  

   eventArgs.set_cancel(true)

}

The example above initiates modal confirmation jQuery UI dialog and immediately cancels menu postback (Line 18). Later if user clicks “Yes” button – dialog is closed and manual menu postback is initiated (Line 10) – it passes menu ID and correct postback argruments which result in server-side Click event of menu control. If user clicks “No” – dialog is closed and nothing else happens.

Infragistics WebDataMenu delayed resizing in Chrome

By , 08/01/2014 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 , 07/17/2014 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'»

Infragistics WebDataGrid stalls on paging large datasets

By , 06/25/2014 4:12 PM

A common scenario while using Infragistics WebDataGrid is to have an unbound column, whose cell’s value is determined at runtime in InitializeRow event, something like

Private Sub xmyGrid_InitializeRow(ByVal sender As Object, ByVal e As GridControls.RowEventArgs) Handles xmyGrid.InitializeRow
   '... some code
   e.Row.Items(0).Value = SomeCalculatedData
   '... some more code
End Sub

This works fine if you bind the grid to a small data set (and you should!) But if, due to circumstances out of your control, you bind it to a dataset with tens of thousand of records you might be screwed. Even if you enable paging (and you most definitely should!) you may find yourself living in a shotgun shack in a situation that changing page takes forever and eventually crashes. If you do – change the above line to

e.Row.Items(0).Text = SomeCalculatedData

note using of .Text property, which is String, instead of .Value which is Object. Since you’re assigning the calculated data for presentation only – no need to change underlying value – and this makes all the difference.

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

By , 12/04/2013 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'»

WebHierarchicalDataGrid: get_scrollTop() returns incorrect value

By , 08/02/2013 12:52 PM

Infragistics WebHierarchicalDataGrid has a neat client-side built-in function get_scrollTop() – it is used if at any point you need to retrieve current vertical scroll position of the grid (e.g. to use it in your own calculations to display something at a specific position on the grid – tooltip, help, additional info etc.)

Unfortunately the function has a bug: its value only set if user actually manually scrolls the grid: using mouse and scrollbar on the right, keyboard etc. If no scrolling user-interaction is involved and scroll position changes due to other means (e.g. displayed data size changes) – the function retains original value, throwing all your calculation out of whack. Continue reading 'WebHierarchicalDataGrid: get_scrollTop() returns incorrect value'»

Disable WebDataTree in client-side JavaScript

By , 05/21/2013 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

Solution for IE10 error: SCRIPT5022: Sys.ArgumentOutOfRangeException: Value must be an integer

By , 05/01/2013 2:05 PM

If you’re testing your ASP.NET project in Internet Explorer 10, you may encounter following error:

SCRIPT5022: Sys.ArgumentOutOfRangeException: Value must be an integer.
Parameter name: (x or y)
Actual value was (some floating point value)
ScriptResource.axd, line … character …

Often it come up when you use some 3rd party libraries, Telerik or Infragistics (in my case it happened in WebDataMenu control).

Here why it happens. Continue reading 'Solution for IE10 error: SCRIPT5022: Sys.ArgumentOutOfRangeException: Value must be an integer'»

Panorama Theme by Themocracy