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CheckedItems returns 0

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ComboBox
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RBeco
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RBeco asked on 27 Apr 2014, 11:34 AM
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?

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Shinu
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answered on 28 Apr 2014, 05:44 AM
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.
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Gauri
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answered on 16 Jul 2018, 04:51 PM

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

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Marin Bratanov
Telerik team
answered on 16 Jul 2018, 05:29 PM
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
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Gauri
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answered on 16 Jul 2018, 05:39 PM

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.

 

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RBeco
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Answers by
Shinu
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Gauri
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Marin Bratanov
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