Would like to inform user when search returns no results

[Alex]

I'd like to give the user a popup or tooltip of some sort that lets them know that, yes a search has been conducted with the text they've provided but there are no results with their input.

Unfortunately all the events I've tried are too early (the data source's OnSelected) or don't get triggered (the search box's Search). How can I achieve this?

[Peter Milchev]

Hello Alex,

The SearchBox does not have public client-side events that are fired when the response is received from the server. 

Nevertheless, the following JavaScript workaround can be used to check the response of the server and notify the client if there are no results: 

var $ = $telerik.$;
var oldOnCallbackResponse = Telerik.Web.UI.RadSearchBox.prototype._onCallbackResponse;
Telerik.Web.UI.RadSearchBox.prototype._onCallbackResponse = function (response, args) {
    // call the default function
    oldOnCallbackResponse.call(this, response, args);

    var searchbox = this;
    var split = response.split("_$$_"),
        data = $.parseJSON(split[0]);

    if (!data.length) {
        console.log('no records')
        // notify user or style the SearchBox
    }
}

Regards,
Peter Milchev
Progress Telerik