Cancel Post back on OnClientSelectedIndexChanging....

[Nate]

Hello,

I have the following code:

	function OnClientSelectedIndexChanging(sender, eventArgs)
	{
	var vItem = eventArgs.get_item();
	if (vItem.get_value() == "...")
	{
	alert('bad value');
	return false; //cancel post back.
	}
	}

I get the alert box, but what do i need to do to cancel the post back?

TIA

[Helen]

Hello,

You should cancel the postback with the following code:

eventArgs.set_cancel(true);

Hope this helps.

Kind regards,
Helen
the Telerik team

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[Maria]

Hello,
How can I cancel  calling postback, but do not cancel selecting changed.

if I use eventArgs.set_cancel(true) it do not save selected item

[Princy]

Hello Maria,

You can simply set the AutoPostBack property of the RadComboBox to false which will still trigger the OnClientSelectedIndexChanged event. Also you can explicitly do postback using the __doPostBack() methods, whenever required.

Thanks
Princy.

[Aarsh]

I am using a combobox which has programatically populated suggestion list and allows custom-text. All worked as expected, except ... my combobox was asserting annoying post-backs on 'lost focus' or blur event even if the record was not in the suggestion box

I did following on my rad combobox it seemed to be addressing my requirements somehow.

function radComboBoxLostFocus(sender, args) {
                if (document.getElementById("_ispostback") == 'True')
                    return;
            }

And my markup looks something as below:

<input type="hidden" id="_ispostback" value="<%=Page.IsPostBack.ToString() %>" />

<telerik:RadComboBox ID="ddLastName" runat="server" AllowCustomText="true" CausesValidation="false"
    DropDownWidth="400px" Width="150px" EnableLoadOnDemand="true" EnableVirtualScrolling="true"  ClientIDMode="Static" ShowMoreResultsBox="true" AutoPostBack="True" OnItemsRequested="ddLastName_ItemsRequested" OnClientBlur="radComboBoxLostFocus()"
     OnSelectedIndexChanged="ddLastName_SelectedIndexChanged" ItemsPerRequest="10">
</telerik:RadComboBox>