test.js

var YelpOn = false;
	$(document).on('touchstart', 'li#Yelp', YelpEvent);
	$("li#Yelp").on("touchstart click", function (e) {
	    e.preventDefault();
	    e.stopPropagation();
	    YelpEvent();
	});
	
	function YelpEvent(){
	    if (YelpOn == true) {
	        $("li#Yelp").removeClass('active'); // Mark all as inactive
	        YelpOn = false;
	        ClearYelpResult();
	    }
	    else {
	        $("li#Yelp").addClass('active'); // Mark link as active
	        YelpOn = true;
	        //ContactYelp();
	        Yelpmarkers();
	    }
	}
	
	var markerYelpLayer = L.mapbox.markerLayer()
	.addTo(map); 
	
	markerYelpLayer.on('layeradd', function(e) {
    var Yelpmarker = e.layer,
        Yelpfeature = Yelpmarker.feature; 
       
    Yelpmarker.setIcon(L.icon(Yelpfeature.properties.icon));
    
    var popupYelp =  '<h2>' + Yelpfeature.properties.name + '</h2>';
                        
    markerYelpLayer.bindPopup(popupYelp,{
        closeButton: false,
        minWidth: 75,
        maxWidth: 100
	    });
	    
	 });
	
	function Yelpmarkers() {
	var term = "museum";
	var Bounds = map.getBounds().toBBoxString(); //produces a string with 4 values 'southwest_lng,southwest_lat,northeast_lng,northeast_lat
	var north_lat = Bounds.substring(0,18);		 //substring used to get the value we need from Bounds.
	var west_lng = Bounds.substring(19,36);
	var south_lat = Bounds.substring(37,55);
	var east_lng = Bounds.substring(56,75);
    ContactYelp(term, north_lat, west_lng, south_lat, east_lng);   
 	}
	
	function ContactYelp(term, north_lat, west_lng, south_lat, east_lng) {		
		//showProgress("div#spinner");
	    $.getJSON('http://api.yelp.com/business_review_search?term=' + term + '&tl_lat=' + west_lng + '&tl_long=' + north_lat + '&br_lat=' + east_lng + '&br_long=' + south_lat + '&limit=30&ywsid=7bX0EJj3ZMuwfumUQUyXrw&callback=?', 
	    function (d) {
	        if (d.businesses.length == 0) {
	            alert("No Yelp result for this area.");
	            $("li#Yelp").removeClass('active'); // Mark all as inactive
	        	YelpOn = false;
	        } else {
	        parseYelpResult(d);
			//hideProgress("div#spinner");
			}
	    });
	}
		function parseYelpResult(d) {
	        var newYelp = {
		    type: "FeatureCollection",
            features: []
            };
			$.each(d.businesses, function (i, item) {	
                newYelp.features.push({	
                    type: "Feature",
                    geometry: {
                        type: "Point",
                        coordinates: [item.longitude, item.latitude]
                    },
                    properties: {
                    name: item.name,
                    address1: item.address1,
                    city: item.city,
                    state: item.state,
                    rating_img_url: item.rating_img_url_small,
                    mobile_url: item.mobile_url,
                    review_count: item.review_count	,
                    "icon": {
                        "iconUrl": "http://placekitten.com/100/100",
                        "iconSize": [50, 50],
                        "iconAnchor": [25, 25], 
                        "popupAnchor": [0, -25]
                        }
                    }
                });
            });	
		markerYelpLayer.setGeoJSON(newYelp);
	};
	
	function ClearYelpResult() {
	     markerYelpLayer.clearLayers();
	}