CheckedItems returns 0

[RBeco]

I have a RadCombobox on my page as follows:

  <telerik:RadComboBox ID="cboBenchmarkCompanies" runat="server" 
                                                     CheckBoxes="true" 
                                                     DataTextField="Value"
                                                     DataValueField="Key"
                                                     EnableLoadOnDemand="False"
                                                     OnClientItemChecking="CheckMaxBenchmarkCompanies"
                                                     meta:resourcekey="cboBenchmarkCompanies" />

I load the list in the onload with:
            if (!this.IsPostBack) {
                var allCompanies = _applicationUserRepository.GetAllSurveyUsers();
                cboBenchmarkCompanies.DataSource = allCompanies;
                cboBenchmarkCompanies.DataBind(); }

If i then try to retrieve the checked items after pressing a save button, i always get back an empty collection instead of my checked items:
foreach (var checkedItem in cboBenchmarkCompanies.CheckedItems ){

What am I doing wrong?

[Shinu]

Hi,

Unfortunately I couldn't replicate the issue at my end. Please have a look into the sample code snippet which works fine at my end.

ASPX:

<telerik:RadComboBox ID="cboBenchmarkCompanies" runat="server" CheckBoxes="true"  DataTextField="CountryName" DataValueField="CountryId" />
<telerik:RadButton ID="radbtnCheckedItems" runat="server" Text="CheckedItems" OnClick="radbtnCheckedItems_Click">
</telerik:RadButton>

C#:

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        DataTable data = GetData(new SqlCommand("SELECT CountryName,CountryId FROM Country"));
        cboBenchmarkCompanies.DataSource = data; ;
        cboBenchmarkCompanies.DataBind();
    }
}
protected void radbtnCheckedItems_Click(object sender, EventArgs e)
{
    int checkeditemsCount=cboBenchmarkCompanies.CheckedItems.Count;
    foreach (Telerik.Web.UI.RadComboBoxItem item in cboBenchmarkCompanies.CheckedItems)
    {
        //your code
    }
}
private static DataTable GetData(SqlCommand selectCommand)
{
    selectCommand.Connection = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
    SqlDataAdapter adapter = new SqlDataAdapter(selectCommand);
    DataTable data = new DataTable();
    adapter.Fill(data);
    return data;
}

Please provide your full code if it doesn't help.
Thanks,
Shinu.

[Gauri]

Shinu,

It works when you load the radcombobox from pagebehind. But when you load the radcombobox using 

webservice and ondemandload it doesn't return any data for checkeditems

[Marin Bratanov]

Hi Gauri,

This is the reason why load-on-demand is listed as a limitation of the checbox feature. The following article lists the other known limitation and also offers a solution: https://docs.telerik.com/devtools/aspnet-ajax/controls/combobox/functionality/checkbox-support#limitations.

Regards,
Marin Bratanov
Progress Telerik

[Gauri]

Thanks.

I think you should atleas add a message ot error message when ondemand is used along with CheckBox- true

I used a work around.

For someone else in the same shoe... here it is....

 

I need one to many radcombobox and grid on a page.

I wrote a function to load the unused values in the radcombobox. i.e. If it has values

1 abc

2. bcd

3 cde

4 def

If you add bcd and def next time only abc and cde will be shown in the radcombobox.

Load radcombobox on page_load using the function

use the same function to load the combobox after addingthe value or deleting it from the grid.

Hope it helps others.