google-maps:toggle markers based on criteria

see: http://stackoverflow.com/questions/17798334/toggle-markers-on-a-google-map-using-multiple-criteria-on-jsfiddle

by Alex Azuero

HTML

<script src="http://maps.google.com/maps/api/js?sensor=false&amp;.js"></script>
<div id="map" style="width: 800px; height: 500px;"></div>

<form action="#">
    Filter by ConType
    1: <input value="1" name="contype" type="checkbox" checked/> &nbsp;&nbsp;
    2: <input value="2" name="contype" type="checkbox" checked/> &nbsp;&nbsp;
    3: <input value="3" name="contype" type="checkbox" checked/> &nbsp;&nbsp;
    </form>
<form action="#">
    Filter by Operator
    NER: <input value="NER" name="operator" type="checkbox" checked/> &nbsp;&nbsp;
    SEW: <input value="SEW" name="operator" type="checkbox" checked/> &nbsp;&nbsp;
    TAW: <input value="TAW"  name="operator" type="checkbox" checked/> &nbsp;&nbsp;
    </form>

JavaScript

var json = [{
		"Name" : "NER 1",
		"Latitude" : 51.50732,
		"Longitude" : -0.128673,
		"Connect" : "BS123",
		"ChargeR" : "Standard",
		"ConType" : 1,
		"Operator" : "NER",
	},{
		"Name" : "NER 2",
		"Latitude" : 51.506906,
		"Longitude" : -0.126548,
		"Connect" : "BS234",
		"ChargeR" : "Standard",
		"ConType" : 2,
		"Operator" : "NER",
	},{
		"Name" : "SEW 3",
		"Latitude" : 51.508382,
		"Longitude" : -0.129724,
		"Connect" : "BS345",
		"ChargeR" : "Standard",
		"ConType" : 3,
		"Operator" : "SEW",
	},{
		"Name" : "SEW 1",
		"Latitude" : 51.508322,
		"Longitude" : -0.126902,
		"Connect" : "BS123",
		"ChargeR" : "Standard",
		"ConType" : 1,
		"Operator" : "SEW",
	},{
		"Name" : "TAW 2",
		"Latitude" : 51.507841,
		"Longitude" : -0.126066,
		"Connect" : "BS234",
		"ChargeR" : "Standard",
		"ConType" : 2,
		"Operator" : "TAW",
	},{
		"Name" : "TAW 3",
		"Latitude" : 51.50746,
		"Longitude" : -0.12759,
		"Connect" : "BS345",
		"ChargeR" : "Standard",
		"ConType" : 3,
		"Operator" : "TAW",
	}
]

function initialize() {
    var latlng = new google.maps.LatLng(51.50746, -0.127594);
	var myOptions = {
		zoom: 17,
		center: latlng,
		mapTypeId: google.maps.MapTypeId.ROADMAP,
		mapTypeControl: true,
    };
	map = new google.maps.Map(document.getElementById('map'),myOptions);	
		
        markers = [];
		
        for (var i = 0; i < json.length; i++) {
          var data = json[i],
			latLng = new google.maps.LatLng(data.Latitude, data.Longitude);
          var marker = new google.maps.Marker({
            position: latLng,
			map : map,
			title : data.Name,
						
          });
		  	  
		   markers.push(marker);
		   // end Looping through the JSON data
		   <!-- Map traffic begin -->		
		   // end Creating a closure	  		  
        }
		// var markerCluster = new MarkerClusterer(map, markers)	
		}
		
		$('[name="contype"],[name="operator"],').click(function(){
		
		var criteria={contype:[],operator:[]};
		
		$.each(criteria,function(a,b){
		 ...