Is PostBack required for "x items checked" to display?

[Kim]

This is my ComboBox:

<telerik:RadComboBox ID="cmbLocationDCVL" runat="server" AutoPostBack="false" CheckBoxes="true"
    OnClientBlur="OnClientBlurHandler" Width="150" DropDownWidth="300px">
    <CollapseAnimation Duration="200" Type="OutQuint" />
</telerik:RadComboBox>

When I check two items, it should say "2 items checked" in the text field, but it shows nothing until another control forces a postback. the documentation I found does not specify that a postback is required for this functionality. Can someone please confirm that a postback is required? Other than this requirement, a postback isn't necessary, so I was hoping to avoid it.

[Princy]

Hi Kim,

AutoPostBack is not required for the RadComboBox OnClientBlur event handler to work. Please have a look at the following code I tried which works fine at my end.

ASPX:

<telerik:RadComboBox ID="RadComboBox" runat="server" CheckBoxes="true" OnClientBlur="OnClientBlurHandler"
    AutoPostBack="false" Width="150" DropDownWidth="300px">
    <CollapseAnimation Duration="200" Type="OutQuint" />
    <Items>
        <telerik:RadComboBoxItem runat="server" Text="Item 1" />
        <telerik:RadComboBoxItem runat="server" Text="Item 2" />
        <telerik:RadComboBoxItem runat="server" Text="Item 3" />
        <telerik:RadComboBoxItem runat="server" Text="Item 4" />
    </Items>
</telerik:RadComboBox>

JavaScript:

<script type="text/javascript">
    function OnClientBlurHandler(sender, args) {
        var checkedItems = sender.get_checkedItems();
        alert(checkedItems.length + " Items Checked");
    }
</script>

Thanks,
Princy.

[Kim]

Thank you. I hadn't noticed any documentation that I had to do this in JavaScript. This is the script I wrote:

function OnClientBlurHandler(sender, eventArgs) {

    var checkedItems = sender.get_checkedItems();

    switch (checkedItems.length) {

        case 0:

            sender.set_text("");

            break;

        case 1:

            sender.set_text(sender.get_text());

            break;

        default:

            sender.set_text(checkedItems.length + " items checked");

            break;

    }

}