Mapstraction - Jul 2012 - How filter works?

Hi all,

One more support question, sorry.
I''m trying to implement the filter option: I read at least 20 times the
book of Adam, the online resources and the few links about mapstraction
filter.

My JSON print is the following:

{"username":"09adam","email":"09adam at
gmail.com
","countrycode":"CH","latitude":"46.1956","longitude":"6.1481"},

The basic code for my map is:

var mapstraction;
    var    mapstraction = new mxn.Mapstraction(''map-wrapper'',
''googlev3'');

    $(document).ready(function create_map() {
        $.getJSON("allusers.php", function(jobj) {

            for (var i=0; i<jobj.length; i++) {
                var place = jobj[i];
                var mk = new mxn.Marker(new mxn.LatLonPoint(place.latitude,
place.longitude));
                mapstraction.addMarker(mk);


This code will place a marker for every line of the JSON print. As far as I
understand (I am not a programmer) the variable "place" contain all
the
results coming from allusers.php. Next I  add a marker for every
place.latitude and place.longitude contained in the variable place. Until
here it''s ok, the map works (I am already happy for that :)

Now I have to filter. I would like to have on the map only the markers
having "CH" as a country code. I can extract this information using
"place.countrycode". I mean, with "place.countrycode" I have
all the
country code of all the markers. And I should be able to add a marker only
if place.countrycode is equal to "CH":

            mapstraction.addFilter(''place.countrycode'',
''eq'', ''CH'');
            mapstraction.doFilter();

place.countrycode is the value, ''eq'' is the operator equal,
and ''CH'' is the
value for the comparison. As far I can understand, I do not have to add an
attribute to the markers because all the markers have already all the
attributes (allusers.php and the variable "place").

I though I had only to add a simple function like this one:

    function showCHMarkers() {
            mapstraction.addFilter(''place.countrycode'',
''eq'', ''CH'');
            mapstraction.doFilter();}
        };


And then the html code to fire the function:

<li><label><input type="checkbox"
class="checkbox" id="CH"
checked="checked" onClick="showCHMarkers();">CH
(Switzerland)</label></li>

When I click on the checkbox, all the markers are placed on the map, not
only the one having "CH" as a country code.

I think it''s all about my limited brain, I am not able to understand
how
should work. Can someone please help me?

Many thanks
Mauro
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