TreeView in ComboBox

6 posts, 0 answers
  1. Telerik Admin
    Telerik Admin avatar
    1572 posts
    Member since:
    Oct 2004

    Posted 22 Mar 2007 Link to this post


    RadControls version

    RadComboBox v2.6.0 and RadTreeView v6.1.0
    .NET version

    Visual Studio version

    programming language

    browser support

    all browsers supported by RadComboBox and RadTreeView

    This approach is invalid for the current version of Telerik.Web.UI. However, a similar approach is demonstrated here: TreeView in Combo.

    This project shows how to embed RadComboBox in RadTreeView while the combobox is in a callback mode.
  2. Jeffrey
    Jeffrey avatar
    5 posts
    Member since:
    Apr 2007

    Posted 11 May 2007 Link to this post

    This works fine, except when I combine the combobox with the RadAjaxManager control.

    When the page loads the first time, I can expand/collapse/select the RadTree nodes in the combobox.
    When another control causes an Ajax postback to update the combobox after I selected a TreeNode, I am no longer able to click the nodes and the combobox remains open.

    Also, because the combobox is populated on the first page load, the ItemsRequested function is never called.  If I skip the Populate() function on load, it will perform the load on demand, but has a funky side affect of only showing the 2 parent nodes (without any tree structure).

    Thanks for your help,

  3. Rosi
    Rosi avatar
    2529 posts

    Posted 14 May 2007 Link to this post

    Hello Jeffrey,

    Thanks for bringing this to our attention.

    The problem was related to a bug in RadComboBox control. We have addressed the issue in the latest build. You can open a support ticket and we will send you a dev version of the latest build there.

    Looking forward to your ticket,
    the Telerik team

    Instantly find answers to your questions at the new Telerik Support Center
  4. terrysmith
    terrysmith avatar
    131 posts
    Member since:
    Nov 2006

    Posted 18 May 2007 Link to this post

    Is the Javascript in this code sample an old workaround for the bug that has since been fixed? Or is it the standard way of integrating the radCombo and radTreeView?

    Here's why I ask. I need to implement a radGrid on which rows will be added and removed dynamicly at runtime by the user. Some of the cells will be radCombos with radTreeViews inside them. These will be dynamic and added/removed at runtime as well.

    I'm worried about the Javascript I see in this example because it looks very static and hard-coded. There are Javascript variables pointing to the combo text, value, and to the combo itself. Obviously, that would be very difficult to do in my scenerio above.

    Do I still need the Javascript? Also, it sounds like I'll need to request the latest HotFix to get this to work?

    Thank you,
  5. Mike
    Mike avatar
    524 posts
    Member since:
    Feb 2007

    Posted 19 May 2007 Link to this post

    I believe this approach

    is much safer for including in complex edit forms embedded in rad Grid. The dropdown is simulated with just a textbox and an image and the javascript is very little compared to this example.
  6. Jose Ronaldo
    Jose Ronaldo avatar
    22 posts
    Member since:
    Apr 2007

    Posted 05 Aug 2007 Link to this post

    Hi, this solution is excelent. But I have a strange problem. If I use this solution in a new project it's work fine. But I Put it in my project, don't work.
    After disable many features of my project, I discover a cause of problem.
    Mi pages descend of MyPage class and in this class I use PageInit event for set Theme in Pages.

    In this cases an PostBack occours when I select item in a TreeView. If I comment the code, this example work fine.

    Code sample:
            public Page() 
                _createWindowController = false
                //Load += new EventHandler(InternalLoad); 
                Init += new EventHandler(InternalInit); 
                PreInit += new EventHandler(Page_PreInit); 
            void Page_PreInit(object sender, EventArgs e) 
                // Get the theme name from a QueryString variable 
                String ThemeName = Request.QueryString["thename"]; 
                if (ThemeName == null
                    ThemeName = "Default"
                this.Theme = ThemeName; 

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