RadComboBox CheckedItems is always zero

[Zach]

I have a RadCombBox and RadButton like this:

<telerik:RadButton runat="server" id="btnPlantName" OnClick="btnPlantName_Click" Text="Filter"/><br />
        <label for="" class="filterElement">Plant Name: </label>
        <telerik:RadComboBox
            ID="RadComboBoxPlantName"
            DataSourceID="SqlPlantNameList"
            DataTextField="PlantName"
            DataValueField="PlantName"
            AppendDataBoundItems="true"
            runat="server"
            OnClientSelectedIndexChanged="PlantIndexChanged"
            class="filterElement" EnableLoadOnDemand="false"
            CheckBoxes="true" EnableCheckAllItemsCheckBox="true">
        </telerik:RadComboBox>

And my code behind is set up like this: 

protected void btnPlantName_Click(object sender, EventArgs e)
{
   FilterByComboBox(RadComboBoxPlantName, "PlantName");
}

private void FilterByComboBox(RadComboBox box, string columnName)
        {
            var selectedItems = box.CheckedItems;
            List<string> values = new List<string>();

            if (selectedItems.Count != 0)
            {
                foreach (var item in selectedItems)
                    values.Add(item.Text);

                FilterColumnByMultipleValues(columnName, values.ToArray());
            }
        }

When I step through the code, the event is fired properly, but box.CheckItems is always zero.  Why is this?  I need to be able to get all the values.

Thanks!

[Nencho]

Hello Zach,

The CheckedItems would return the collection of items of the RadComobBox, which have their checkboxes checked. Could you specify  If you need to access all items values, or only the checked ones?
If you need all of the items, you could access them using the Items collection -

var selectedItems = box.Items;


Regards,
Nencho
Telerik

 

 

[Dan]

Was this ever resolved? My CHECKEDITEMS.COUNT always return 0 no matter how many items I checked

[Nencho]

Hello Dan,

Since I am not able to locally replicate the issue in question in this thread, when the LoadOnDemand feature is disabled, and as I can see you have already submitted a support ticket on the matter - I would suggest you to continue the correspondence in the support ticket.

Regards,
Nencho
Telerik

[Zach]

Hey Dan,

I don't remember exactly where the problem was in the code that I posted, but here's an example of the code I've been using successfully:

01.<telerik:RadComboBox
02.    ID="RadComboBoxPlantName"
03.    runat="server"
04.    DropDownAutoWidth="Enabled"
05.    AllowCustomText="true"
06.    MarkFirstMatch="true"
07.    Filter="Contains"
08.    CheckBoxes="true">
09.</telerik:RadComboBox>

01.private void BindFilter()
02.{
03.    List<FilterLineItem> plants = _helper.GetPlants();
04.
05.    RadComboBoxPlantName.Items.Clear();
06.    RadComboBoxPlantName.DataSource = plants;
07.
08.    RadComboBoxPlantName.DataTextField = "Name"; //PlantName
09.    RadComboBoxPlantName.DataValueField = "ID"; //PlantID
10.    RadComboBoxPlantName.DataBind();
11.}
12.
13.private List<int> GetSelectedPlants()
14.{
15.    if (RadComboBoxPlantName.CheckedItems.Count == 0)
16.        return new List<int> { -1 }; // -1 = All plants
17.    else
18.    {
19.        var plants = new List<int>();
20.
21.        foreach (var plant in RadComboBoxPlantName.CheckedItems)
22.        {
23.            plants.Add(Convert.ToInt32(plant.Value));
24.        }
25.
26.        return plants;
27.    }
28.}

Hope this helps

[Nencho]

Hello Zach,

Thank you for sharing your solution with the community! Just a note on your implementation - the MarkFirstMatch (and Filtering) functionalities, are not supported along with the Checkboxes support.
However, if you fits your needs - you can still use it.

Regards,
Nencho
Telerik