Conditionally load jquery throbber plugin - asp.net

Question

I have the code below that shows a throbber and makes a getJSON call to an MVC action when the user changes an entry in a select. This all works great except there is a default -- select -- element in the list for which I don't want the getJSON to run.
However, I can't work out how to apply conditional logic to hooking this event. The conditional logic is shown as the if(selectedValue == -1) But the throbber still runs as I've hooked it in the first line. I've tried removing the first line that hooks the change event and use $.throbberShow(..) inline just prior to the getJSON call but for some reason this doesn't show the throbber.
Any help greatly appreciated.
$("#selectlist").throbber("change", { ajax: false, image: "images/ajax-loader-line.gif" });
$("#selectlist").change(
function () {
var selectedValue = $("#selectlist").val();
if (selectedValue != -1) {
//Tried doing $.throbberShow(...) here without success
$.getJSON("/Candidate/GetAddress", { id: selectedValue }, function (data, textStatus) {
if (textStatus == "success") {
$("#selectlist").val(data.Line1)
$("#selectlist").val(data.Line2)
$("#selectlist").val(data.Line3)
$("#selectlist").val(data.Town)
}
$.throbberHide();
});
}
}
);

Answer 1

It is more a hack than a solution as throbber doesn't support conditions but this should work:
$("#selectlist").throbber("change", { ajax: false, image: "images/ajax-loader-line.gif", delay: "500" });
$("#selectlist").change(
function () {
var selectedValue = $("#selectlist").val();
if (selectedValue != -1) {
$.getJSON("/Candidate/GetAddress", { id: selectedValue }, function (data, textStatus) {
if (textStatus == "success") {
$("#selectlist").val(data.Line1)
$("#selectlist").val(data.Line2)
$("#selectlist").val(data.Line3)
$("#selectlist").val(data.Town)
}
$.throbberHide();
});
} else {
$.throbberHide();
}
}
);