Remove checkbox from first item in combobox

[Craig Wallace]

Hi,

Telerik.Web.UI v2013.3.1015.40

I have a simple usage scenario for a RadComboBox:

<telerik:RadComboBox ID="cbProducts" runat="server" Width="250px"
                    DataSourceID="dsProducts" DataTextField="ProductName"
                    DataValueField="ProductID" AppendDataBoundItems="true" CheckBoxes="True"
                    onitemchecked="dlProducts_ItemChecked" AutoPostBack="true">
                        <Items>
                            <telerik:radcomboboxitem Text="-- Select --" Value="" />
                        </Items>
                </telerik:RadComboBox>

This allows the user to select multiple products by using the checkboxes.  The problem is, it also allows the user to check the default '-- Select --' item that I have added as it also shows a checkbox, and there seems to be no 'ShowCheckbox' property on RadComboBoxItem that I can toggle.

How can I remove the checkbox on my first item in the RadComboBox?

Thanks.

[Genady Sergeev]

Hello Craig,

You can use the following JavaScript code to accomplish this:

<script type="text/javascript">
    function comboLoad(sender) {
        var item = sender.get_items().getItem(0),
            checkBoxElement = item.get_checkBoxElement(),
            itemParent = checkBoxElement.parentNode;

            itemParent.removeChild(checkBoxElement);
    }

</script>

<telerik:RadComboBox runat="server" CheckBoxes="true" ID="ComboBox1" OnClientLoad="comboLoad">
    <Items>
        <telerik:RadComboBoxItem Text="Select" />
        <telerik:RadComboBoxItem Text="Text1" />
    </Items>
</telerik:RadComboBox>

I hope that this helps.

Regards,
Genady Sergeev
Telerik

[Craig Wallace]

Hi Genady,

Thanks.  There were a couple of typos in your code but I cleaned them up and the checkbox is removed.

function comboLoad(sender) {
            var item = sender.get_items().getItem(0);
            checkBoxElement = item.get_checkBoxElement();
            itemParent = checkBoxElement.parentNode;
            itemParent.removeChild(checkBoxElement);
        }

There is an additional problem now.  If I click on '-- Select --', it is shown as the dropdown text.  If I then tick one of the checkboxes, the control says that 2 items have been selected.  It's as if clicking on the first item still checks the checkbox.

Any ideas?

Craig

[Genady Sergeev]

Hi Craig,

I am not reproducing the problem with the latest version of the controls therefore this might be a bug in the version that you use. Which one is it?


Regards,
Genady Sergeev
Telerik

[jackson]

get the Separator Text and  set_checked as false.

function disableCheckOptionForSeparator() {
                var comboBox = $find("<%=RadComboBoxSites.ClientID %>");

                var itemSiteSeparator = comboBox.findItemByText("-- Select --");
                if (itemSiteSeparator.get_isSeparator()) {
                    itemSiteSeparator.set_checked(false)
                }

                return true;
            }