This is a migrated thread and some comments may be shown as answers.

A related Comboboxes issue

1 Answer 49 Views
ComboBox
This is a migrated thread and some comments may be shown as answers.
Andreas
Top achievements
Rank 1
Andreas asked on 25 Jul 2010, 08:32 PM

Hi,

using ASP.NET AJAX controls Q3 2009 I placed several rad comboboxes in a RadDock element. The RadDock should act as a collapsable search panel for a RadGrid on the same page. In the Page_Load event all comboboxes are filled with complete appropriate data. The data of some of them can be confined by the selection of others as in the continents/countries example (related comboboxes). I can't get that example work. 

I've implemented the "relation" between a brand and project combo:


1.<telerik:RadComboBox ID="cboBrand" runat="server" AccessKey="B" Width="250px" Filter="Contains" 
2.    ToolTip="bla bla " OnClientSelectedIndexChanged="loadProjects">                         
3. </telerik:RadComboBox>
4.<telerik:RadComboBox ID="cboProject" runat="server" AccessKey="P" Width="250px" Filter="Contains"
5.    AllowCustomText="false" EnableViewState="false" AutoPostBack="false"     
6.EnableLoadOnDemand="false" OnItemsRequested="cboProject_ItemsRequested"                          OnClientItemsRequested="itemsLoaded">
7.</telerik:RadComboBox>

The according javascript functions reside in a special RadCodeBlock (an other block exists for context menu handling for the grid):

01.<telerik:RadCodeBlock ID="SearchComboHandler" runat="server">
02. <script type="text/javascript">
03.    function loadProjects(combo, args) 
04.          { 
05.    varitem = args.get_item(); 
06.       var cboProject = $find("<%=cboProject.ClientID %>");
07.      cboProject.requestItems(item.get_value(), false);
09.          } 
10.  
11.  
12.    function itemsLoaded(combo, eventArqs) 
13.          { 
14.       if (combo.get_items().get_count() > 0) 
15.      
16.         combo.set_text(combo.get_items().getItem(0).get_text()); 
17.         combo.get_items().getItem(0).highlight(); 
18.      
19.    }                     
20. </script> 
21</telerik:RadCodeBlock>

The items of the project combobox are requested as follows (The helper methods returns a data table. It works fine.):

1.protected void cboProject_ItemsRequested(object o, RadComboBoxItemsRequestedEventArgs e)
2.{
3.   cboProject.DataSource = DataHelper.AdminDataRead("project", Convert.ToInt32(e.Text));
4.   cboProject.DataTextField = "name";
5.   cboProject.DataValueField = "id";
6.  
7.   cboProject.DataBind(); 
8.}

After selecting an item from the brand combobox the first appropriate project is shown. Further project entries are displayed only after I opened the project combobox two or three times. Debugging clearified that parameters and data/return values are correctly fetched and transmitted.

I've searched the examples, community and other online resources for two days, tried some of the offered solutions but, nothing worked. A hint what I'm doing wrong would be really helpful. If you need more details or code snippets please let me know about.

Thanks in advance,

Andreas

1 Answer, 1 is accepted

Sort by
0
Andreas
Top achievements
Rank 1
answered on 28 Jul 2010, 12:22 AM
Solved it - literacy helps (sometimes).
Tags
ComboBox
Asked by
Andreas
Top achievements
Rank 1
Answers by
Andreas
Top achievements
Rank 1
Share this question
or