Ben, bir pge thats bir düğme bir php sayfasından json veri getirir var

veri ok gelmesi gibi görünüyor ama yüzlerce örnek ile gitti ve ben sadece cant döndürülen verileri referans gibi görünüyor, burada benim senaryom:

Önceki yorumlardan EDITED SCRIPT

 $('#geo_batch').click(function (){
            var ajax_load = "<label><img src='/images/icons/loadinfo.gif' alt='saving location...' /> Loading data...</label>";
            $("#batch_detail").html(ajax_load);
            $('#batch_buttons').hide();
            var form = $("form"); //Grab the form element from the DOM 
            //alert(form.serialize());
            var mydata = form.serialize();
            $.ajax({  
                type: "POST",  
                url: 'geo_getupdate_list.php', 
                data: mydata,  
                datatype: 'json',
                success: function(dat) {
                    alert('dat:'+ typeof dat ) //RETURNS STRING
                    //alert(dat.location[0].id_mdt); //RETURNS UNDEFINED
                    // Cache the batch_detail element
                    var $detail = $("#batch_detail").html('<label>Locations have been retrieved:<br>' + dat + '<label>');
                    $('#batch_buttons').show();
                    // Instead of several .append() calls on the same element, create a 
                    //   single string, and do one.
                    var appendString = '';
                    for(var key in dat) { alert(key); return false; };
                    /*for(i=0; i < count; i++){
                        appendString += 'display address: ' + data.location[i].displayaddr_mdt + 'flag: ' + data.location[i].flag_mdt;
                    }*/
                    $detail.append(appendString);
                }, 
                error: function(dat) { //Triggered if an error communicating with server   
                     //alert('fail');
                     $("#batch_detail").html('<label>There was an error: '+dat+'<label>');  
                     $('#batch_buttons').show();
                }
            });  
            return false; //Ignore the default behavior of the button click  
        }); 

döndürülen json olduğunu:

{"location":[{"id_mdt":"5","idetp_mdt":"1","name_mdt":null,"geoaddr_mdt":null,"displayaddr_mdt":"31a Arundel Gardens London W11 2LW","telephone_mdt":null,"email_mdt":null,"website_mdt":"http:\/\/","lat_mdt":"51.513561","lng_mdt":"-0.206519","active_mdt":"1","flag_mdt":"1","id_etp":"1","name_etp":"Stockist","icon_etp":null},{"id_mdt":"1","idetp_mdt":"1","name_mdt":null,"geoaddr_mdt":null,"displayaddr_mdt":"via todde 29 Ales Sardegna 09091","telephone_mdt":null,"email_mdt":null,"website_mdt":"http:\/\/","lat_mdt":"39.7670964","lng_mdt":"8.813689","active_mdt":"1","flag_mdt":"1","id_etp":"1","name_etp":"Stockist","icon_etp":null},{"id_mdt":"4","idetp_mdt":"1","name_mdt":null,"geoaddr_mdt":null,"displayaddr_mdt":"31a Arundel Gardens London W11 2LW","telephone_mdt":null,"email_mdt":null,"website_mdt":"http:\/\/","lat_mdt":"51.513561","lng_mdt":"-0.206519","active_mdt":"1","flag_mdt":"1","id_etp":"1","name_etp":"Stockist","icon_etp":null},{"id_mdt":"3","idetp_mdt":"1","name_mdt":null,"geoaddr_mdt":null,"displayaddr_mdt":"31a Arundel Gardens London W11 2LW","telephone_mdt":null,"email_mdt":null,"website_mdt":"http:\/\/","lat_mdt":"51.513561","lng_mdt":"-0.206519","active_mdt":"1","flag_mdt":"1","id_etp":"1","name_etp":"Stockist","icon_etp":null},{"id_mdt":"6","idetp_mdt":"1","name_mdt":null,"geoaddr_mdt":null,"displayaddr_mdt":"31a Arundel Gardens London W11 2LW","telephone_mdt":null,"email_mdt":null,"website_mdt":null,"lat_mdt":"51.513561","lng_mdt":"-0.206519","active_mdt":"1","flag_mdt":"1","id_etp":"1","name_etp":"Stockist","icon_etp":null},{"id_mdt":"7","idetp_mdt":"1","name_mdt":"Test","geoaddr_mdt":null,"displayaddr_mdt":"31a Arundel Gardens London W11 2LW","telephone_mdt":null,"email_mdt":null,"website_mdt":null,"lat_mdt":"51.513561","lng_mdt":"-0.206519","active_mdt":"1","flag_mdt":"1","id_etp":"1","name_etp":"Stockist","icon_etp":null}]}

nasıl ben dizideki veri girebilirim?

i have tried so many examples on here and other places and i cant get any to work. I think it may be to do with the returned json object it has [ symbols in it which i think is wrong?

aşağıdaki gibi ben json üretmek zorunda php:

//have defined a recordset called $rs_locations
$rows = array();
while($r = mysql_fetch_assoc($rs_locations)) {
    $rows[] = $r;
}
$jsondata = json_encode($rows);
// trying to strip out the [ ] brackets but doesn't work
str_replace ("[", "", $jsondata);
str_replace ("]", "", $jsondata);
echo($jsondata);

herhangi bir fikir herkes, ben çok şaşırıp, teşekkürler