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Radcombobox Grouping

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ComboBox
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Prathap Narravula
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Prathap Narravula asked on 07 Apr 2012, 01:32 PM

I want to fill my radcombobox with grouping like category and items which should get from database.
Please find the attachment for the reference
example :
category1
   --Item1
   --item2
Category2
   --item1
   --item2
Category3
    --item1
    --item2
    --item3

Thanks
Prathap

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Ivana
Telerik team
answered on 11 Apr 2012, 09:52 AM
Hi Prathap,

You could use the IsSeparator property of RadComboBoxItem. Here is an example:
<telerik:RadComboBox ID="RadComboBox1" runat="server" Width="200">
    <Items>
        <telerik:RadComboBoxItem Text="item1" IsSeparator="true"/>
        <telerik:RadComboBoxItem Text="item1.1" />
        <telerik:RadComboBoxItem Text="item1.2" />
        <telerik:RadComboBoxItem Text="item1.3" />
        <telerik:RadComboBoxItem Text="item2" IsSeparator="true"/>
        <telerik:RadComboBoxItem Text="item2.1" />
        <telerik:RadComboBoxItem Text="item2.2" />
        <telerik:RadComboBoxItem Text="item2.3" />
    </Items>
</telerik:RadComboBox>

I hope this helps.

All the best,
Ivana
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Prathap Narravula
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answered on 11 Apr 2012, 11:59 AM
Hi Ivana,

Thanks for your reply..
I need to fill the dropdown values from database. How do i write Issperator=true.

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Cat Cheshire
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answered on 16 Apr 2012, 08:44 AM

You can handle the combo ItemDatabound event and set the item IsSeparator property:
protected void RadComboBox2_ItemDataBound(object sender, Telerik.Web.UI.RadComboBoxItemEventArgs e)
{
         
    RadComboBoxItem item = e.Item;
 
    if(item.Text.Contains("Category"))
        item.IsSeparator = true;
         
}
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Arnie Vargas
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answered on 08 Oct 2012, 08:15 PM
How would this work for a field which has the separator in a different field?

For example I have a list of people and they have each have a TITLE value which is their position.

--Doctors(Title column)
  --Doctor #1 (name column)
  --Doctor #2 (name column)
--MA(title column)
  --MA #1(name column)
  --MA #2(name column)
--RECEPTION(title column)
  --Receptionist #1(name column)
  --Receptionist #2(name column)
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Nencho
Telerik team
answered on 09 Oct 2012, 02:57 PM
Hi Arnie,

I have prepared a sample project for you, in order to demonstrate you how to implement the desired functionality. Please note that RadComboBox is not a hierarchical control and implementing the suggested approach could be a tricky task.

All the best,
Nencho
the Telerik team
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Arnie Vargas
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answered on 09 Oct 2012, 03:56 PM
Thanks!

I will try and switch it around as I am populating from a datase
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Eric D. Burdo
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answered on 05 Jan 2017, 07:51 PM
private void LoadAssigneeList() {
  List<AssigneeModel> lstAll = GetAssignees();
  ddlCombinedAssignees.Items.Clear();   //Remove all the items, so we don't load more than once
 
  //Add a new category when it changes
  int teamCat = -1;
  foreach (var item in lstAll) {
    if (item.TeamID != teamCat) {
      teamCat = item.TeamID;
      var itmCat = new RadComboBoxItem(item.TeamName, item.TeamID.ToString());
      itmCat.IsSeparator = true;
      ddlCombinedAssignees.Items.Add(itmCat);
    }
 
    var itm = new RadComboBoxItem(item.LastFirst, item.UserID);
    ddlCombinedAssignees.Items.Add(itm);
  }
}

 

Here is a method I use.  The "GetAssignees" routine is a class or model.  It has four properties:  LastFirst, UserID, TeamName, TeamID.

I want my categories to be the TeamName, and the items to be the Name (with UserID as the value).

GetAssignees talks to the DB and populates a List<> of the Assignees... I then walk through that to populate the RadComboBox.

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Nencho
Telerik team
answered on 10 Jan 2017, 09:26 AM
Hello Eric,

Thank you for sharing your solution with the community!

Regards,
Nencho
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ComboBox
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Prathap Narravula
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Answers by
Ivana
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Prathap Narravula
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Cat Cheshire
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Arnie Vargas
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Nencho
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Eric D. Burdo
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