Leaflet-LayerConfig

Library that communicates with a web service/reads a stored JavaScript object and adds layers to a leaflet map.

##Usage L.LayerConfig takes two arguments, the first one is either a URL or a object containing the information about the layers to add. A sample.json file is provided that shows some of the options available. The second argument is the map container or LayerGroup/FeatureGroup on which we add layers to.

var layerConfig = L.layerConfig(object or url to json file, map);

##JSON notation The object containing the information is pretty basic, here is a sample file adding only a marker and setting the map view to a coordinate and a zoomlevel. You can also set bounds if you want to fit the map view to always show some objects.

{
   "center": [63.43048, 10.39508],
   "zoom": 14, 
   "layers": [
       {
           "type": "marker",
           "latLng": [63.43048, 10.39508],
           "popupContent": "Olavs statuen"
       }
   ]
}

To pass options to the layer simply add a options key to the layer. The options passed to the layer is in the same format as the Leaflet options found in the reference. Some option keys support functions if you want to pass a function to Leaflet through a web service you need to put it in a single line string. A minifier can help with that. This is because JSON does not support functions or multiline strings.

###Other supported layer types:

####GeoJSON This can either take an URL or a GeoJSON object

{
         	"type": "geojson",
         	"url": "http://example.com/geojson-example.geojson",
         	"options": {
         		"style": "function () { return { color: \"red\" }; };"
         	}

}

{
  "type": "geojson",
  "geojson": {
			  "type": "FeatureCollection",
			  "features": [
			    {
			      "type": "Feature",
			      "geometry": {
			        "type": "Point",
			        "coordinates": [102.0, 0.6]
			      },
			      "properties": {
			        "prop0": "value0"
			      }
			    }
			  ]
			}

}

####TileLayer

{
    "type": "tilelayer",
    "url": "http://b.tiles.mapbox.com/v3/torbjornav.hhni5j5f/{z}/{x}/{y}.png",
    "options": {
        "attribution": "Mapbox"
    }
}

####WMS

{
    "type": "wms",
    "url": "URL-TO-WMS",
    "options": {
        //WMS OPTIONS GO HERE
    }
}

####PolyLine

 {
    "type": "line",
    "path": [[63.43182, 10.39195],[63.42526, 10.3937]],
    "popupContent": "Prinsens gate"
 }

####Polygon

 {
    "type": "polygon",
    "path": [[[63.42639, 10.38975],[63.42564, 10.39006],
    	    [63.42570, 10.39194],[63.42643, 10.39183],
    	    [63.42639, 10.38975]]]
 }

####Rectangle

 {
    "type": "rectangle",
    "path": [[63.42647, 10.39694],[63.42554, 10.39508]],
    "options": {
        
            "color": "red"
        
    }
 }

####Circle

{ 
    "type": "circle",
    "latLng": [63.43055, 10.39273],
    "radius": 10
}

####CircleMarker

{
    "type": "circlemarker",
    "latLng": [63.43034, 10.38647]
}

####FeatureGroup FeatureGroup has a "layer" key containing the layers to be added to it. This is in the same format as the top-level layer key.

{
    "type": "featuregroup",
    "layers": [
        {
            "type": "marker",
            "latLng": [63.43027, 10.40094]
        },
        { 
            "type": "circle",
            "latLng": [63.43055, 10.39273],
            "radius": 10
        },
        {
            "type": "circlemarker",
            "latLng": [63.43034, 10.38647]
        }

    ],
    "popupContent": "Kongens gate"
}

####LayerGroup LayerGroup has a "layer" key containing the layers to be added to it. This is in the same format as the top-level layer key.

{
    "type": "layergroup",
    "layers": [
        {
            "type": "marker",
            "latLng": [63.43027, 10.40094]
        },
        { 
            "type": "circle",
            "latLng": [63.43055, 10.39273],
            "radius": 10
        },
        {
            "type": "circlemarker",
            "latLng": [63.43034, 10.38647]
        }

    ]
}

###Events Leaflet-LayerConfig fires various events.

Name	Description
startLayerLoading	Fired when the JSON object is read and we're ready to start loading layers
stopLayerLoading	Fired when all layers has been loaded
LayerLoaded	Fired when a layer has been added. Passes the Leaflet layer, type of layer and the name of the layer with the event object
GroupLoadingStart	Fired when we start loading layers to a group. Passes the group to the layer
GroupLoadingEnd	Fired when we have loaded all sub-layers to a group