Cancel OnClientSelectedIndexChanging with Webservice callback function

[Karl]

Hi,

I have a RadCombo with the following event : OnClientSelectedIndexChanging which contains a call to a web service which returns a value. Depending on the value I may need to cancel the change. I have a callback function attached to the webservice.

 

How would I going about cancelling the change if I needed to?

 

Thanks

[Kalina]

Hi Karl,

You can try cancelling the OnClientSelectedIndexChanging event in this way:

function OnClientSelectedIndexChangingHandler(sender, eventArgs)
{
    var value = "web_service_Result";
    if (value !="web_service_Result" )
        eventArgs.set_cancel(false)
    else
        eventArgs.set_cancel(true);
}

More details about OnClientSelectedIndexChanging event you can find at this help article.

Best wishes,
Kalina
the Telerik team

[Karl]

Hi,

I'm using a Callback function to get the return value from my webservice like so:

 

function OnClientSelectedIndexChanging(sender, eventArgs)

{

    WebServiceRoot.CheckInterval(<%=ID %>, item.get_text(), CallbackInternalCheck);

    if(window.intervalcheck)

    {

        alert('|1:' + window.intervalcheck);

        eventArgs.set_cancel(false)

    }

    else

    {

        alert('|2:' + window.intervalcheck);

        eventArgs.set_cancel(true);

    } 

}

var intervalcheck;
function CallbackInternalCheck(result) {
   intervalcheck = result;
}

When I do the above intervalcheck is always underfined. Any other ideas?

Thanks

[Dimitar Terziev]

Hi Karl,

Could you verify, if the callback function is executed, because if the "intervalcheck" variable is undefined then you are not assigning any value to it.

On how to call a callback function, please refer to the following threads here and here.

Regards,
Dimitar Terziev
the Telerik team

[Karl]

Hi,
I've put and alert(result) and it brings back a value. When I assigned it to internalcheck and try and access it within the OnClientSelectedIndexChanging it becomes undefined. I can get the value from internalcheck else where but but not in OnClientSelectedIndexChanging.

Thanks

[Dimitar Terziev]

Hello Karl,

In order to investigate the cause of this issue, please open a support ticket and provide us with runnable version of your project in order to test it locally.

Greetings,
Dimitar Terziev
the Telerik team