javascript - Mapbox: How to filter markers by category? -

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i creating first map using mapbox , want able filter markers category. following example on mapbox doc page:

https://www.mapbox.com/mapbox.js/example/v1.0.0/multiple-marker-filters/

i have property each marker following key: cat_code. can't seem legend appear can toggle markers off , on.

anyone have clues?

jsfiddle 

l.mapbox.accesstoken = 'pk.eyj1ijoizg9zcyisimeioii1nfituws4in0.-9qpbofe3jc68wduqa1akg'; var map = l.mapbox.map('map', 'mapbox.light');  var featurelayer = {  "type": "featurecollection",  "features": [   {   "type": "feature",   "properties": {     "marker-color": "#7e7e7e",     "marker-size": "medium",     "marker-symbol": "heliport",     "cat_code": "12311"   },   "geometry": {     "type": "point",     "coordinates": [       46.40625,       53.54030739150022     ]   } }, {   "type": "feature",   "properties": {     "marker-color": "#7e7e7e",     "marker-size": "medium",     "marker-symbol": "",     "cat_code": "1231566"   },   "geometry": {     "type": "point",     "coordinates": [       58.00781249999999,       55.97379820507658     ]   } }, {   "type": "feature",   "properties": {     "marker-color": "#7e7e7e",     "marker-size": "medium",     "marker-symbol": "",     "cat_code": "12311"   },   "geometry": {     "type": "point",     "coordinates": [       45.3515625,       62.431074232920906     ]   }  }  ] };  // find , store variable reference list of filters. var filters = document.getelementbyid('filters');   // wait until marker layer loaded in order build list of  possible // types. if doing featurelayer, should change // map.featurelayer variable have assigned  featurelayer. map.featurelayer.on('ready', function() { // collect types of symbols in layer. can // hardcode array of types if know want filter on, // var types = ['foo', 'bar']; var typesobj = {}, types = []; var features = map.featurelayer.getgeojson().features; (var = 0; < features.length; i++) { typesobj[features[i].properties['cat_code']] = true; } (var k in typesobj) types.push(k);  var checkboxes = []; // create filter interface. (var = 0; < types.length; i++) { // create an input checkbox , label inside. var item = filters.appendchild(document.createelement('div')); var checkbox = item.appendchild(document.createelement('input')); var label = item.appendchild(document.createelement('label')); checkbox.type = 'checkbox'; checkbox.id = types[i]; checkbox.checked = true; // create label right of checkbox explanatory text label.innerhtml = types[i]; label.setattribute('for', types[i]); // whenever person clicks on checkbox, call update(). checkbox.addeventlistener('change', update); checkboxes.push(checkbox); }  // function called whenever clicks on checkbox , changes // selection of markers displayed. function update() { var enabled = {}; // run through each checkbox , record whether checked. if is, // add object of types display, otherwise not. (var = 0; < checkboxes.length; i++) {   if (checkboxes[i].checked) enabled[checkboxes[i].id] = true; } map.pois.setfilter(function(feature) {   // if symbol in list, return true. if not, return false.   // 'in' operator in javascript that: given string   // or number, says if in object.   // 2 in { 2: true } // true   // 2 in { } // false   return (feature.properties['cat_code'] in enabled); }); } });

you never loading geojson onto map's featurelayer, leaving in original form object. did renaming , fixed in fiddle.


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