javascript - Leaflet: How to style 2000+ points in a GeoJSON object with no style properties? -

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i have single geojson featurecollection object contains on 2000 features. in geojson object, each feature part of 1 category so:

{   "type": "feature",   "properties": {     "category": "electrical",     "name": "plane no 2"   },   "geometry": {     "type": "point",     "coordinates": [       94.5703125,       58.722598828043374     ]   } }, {   "type": "feature",   "properties": {     "category": "military",     "name": "base 1"   },   "geometry": {     "type": "point",     "coordinates": [       104.4140625,       62.91523303947614     ]   } },

in actual data, there total of 38 categories (each feature assigned 1 category).

is using javascript switch statement in situation practical solution in order give each point own styling? or, there better way?

i doing in code:

l.geojson(mygeojson, { oneachfeature: function (feature, layer){     layer.bindpopup(l.util.template(popuptemplate, feature.properties)); }, pointtolayer: function (feature, latlng){     return l.circlemarker(latlng, gjsonoptions); }, // 3 of 38 categories listed here example style: function(feature){         switch(feature.properties.category){             case 'electrical': return { color: '#fb8072'};             case 'military': return { color: '#b3de69'};             case 'aviation': return { color: '#80b1d3'};         }     } }).addto(map);

demo link here

i think 1 should add colors on clientside, he/she did in code example. adding colors each geojson feature needlessly bloat transfer. if want add them collection create sort of legend property in collection object so:

var collection = {     "type": "featurecollection",     "properties": {         "legend": {             "electrical": "#fb8072",             "military": "#b3de69",             "aviation": "#80b1d3"         }     }     "features": [...] }

so when create geojson layer can add them on fly:

l.geojson(collection, {     'style': function (feature) {         return {             'color': collection.properties.legend[feature.properties.category]         }     } }).addto(map);

you instead of storing legend in collection object, store in code/script somewhere:

var legend = {     "electrical": "#fb8072",     "military": "#b3de69",     "aviation": "#80b1d3" }  l.geojson(collection, {     'style': function (feature) {         return {             'color': legend[feature.properties.category]         }     } }).addto(map);

edit after comments:

if need set l.marker icons should use pointtolayer function:

l.geojson(collection, {     'pointtolayer': function (feature, latlng) {         return new l.marker(latlng, {             'icon': new l.icon({                 'iconurl': 'icons/' + feature.properties.category + '.png'                 ...             })         })     } }).addto(map);

you're using l.circlemarker doesn't support icon option. it's path supports pathoptions:

here's nice tutorial on creating l.marker's custom icons:


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