javascript - Continuously Loading Markers from database depending on last loaded timestamp -


i have marker locations saved in database lat, lng, type, , timestamp. current code loads markers (displaying different icons depending on type), when use setinterval function reload again. 1 solution suggested me add variable checks timestamp on first successful load , updates each time, when function triggered again load markers added after time. i'm not sure how go adding in current code. help/suggestions appreciated. 

setinterval(function(){     //load markers xml file $.get("json-data-locations_2.php", function(data) {     $(data).find("marker").each(function() {         var type = $(this).attr('type');         var point = new google.maps.latlng(parsefloat($(this).attr('lat')), parsefloat($(this).attr('lng')));          var icons;           if (type === 'drink') {             icons = 'newmarkers/blue.png';         }         else if (type === 'food') {             icons = 'newmarkers/orange.png';         }         else {             icons = 'newmarkers/purple.png';         }          create_marker(point, type, "", false, false, false, icons);      }); }); }, 8000);

an other approach one. call function allready have once, use setinterval on new same function , change .php file request data new 1 returns latest marker based on timestamp query like:

select max(timestamp) timestamp mytable

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