JQM listview before filter: query data?

JQM listview before filter: query data?

I am trying to get the ListView before filter function working.  I can get the demo to work successfully on my project but when I try to query my own url, it fails. I suspect it has something to do with the data. 
 
The example code uses: data: {
q: $input.val()
}

 
'q' did not work for me, so I tried the field name from my table instead "OrgName"
 
data: {
OrgName: $input.val()
}

 
That did not work either.  My list comes from a single column table.  I also changed the datatype to 'json' (from 'jsonp' and removed the crossdomain = true
 
Is there any significance to 'q' vs. 'OrgName'?
 
My code is:
 
 $(document).ready(function () {
 $("#autocomplete").on("listviewbeforefilter", function (e, data) {
 var $ul = $(this), $input = $(data.input), value = $input.val(),
 html = "";
 $ul.html("");
 if (value && value.length > 0) {
 $ul.html("<li><div class='ui-loader'><span class='ui-icon ui-icon-loading'></span></div></li>");
 $ul.listview("refresh");
$.ajax({
 type: 'POST',
 contentType: 'application/json; charset=utf-8',
 url: "Members.asmx/test",
 dataType: "json",
data: {
OrgName: $input.val()
}
})
 .then(function (response) {
 $.each(response, function (i, val) {
 html += "<li>" + val + "</li>";
});
$ul.html(html);
 $ul.listview("refresh");
 $ul.trigger("updatelayout");
});
}
});
});



























Any help is appreciated.  Thanks.