leaflet-layerjson

A Dynamic Leaflet Layer that load/filter dinamically JSON data from Ajax/Jsonp, with caching

Leaflet Dynamic JSON Layer

Simple way for transform any JSON data source in a Leaflet Layer!

A Dynamic Leaflet Layer that load JSON data in layer in the form of markers with attributes

and minimize remote requests with caching system

Tested in Leaflet 0.7

var l = new L.LayerJSON({url: "search.php?lat1={lat1}&lat2={lat2}&lon1={lon1}&lon2={lon2}" });
map.addLayer(l);

Data Source:

  • url remote url,
  • jsonpParam callback parameter name for jsonp request append to url
  • callData alternative function that return data (if use $.ajax() set async=false)

Filtering:

  • propertyItems json property used contains data items
  • propertyLoc json property used as Latlng of marker, if is array: ['lat','lon'] select double fields
  • propertyTitle json property used as title in marker
  • filterData function for pre-filter data

Rendering:

  • dataToMarker function that will be used for creating markers from json points
  • onEachMarker function called on each marker created, similar to option onEachFeature of L.GeoJSON
  • layerTarget pre-existing layer to add markers(L.LayerGroup, L.MarkerClusterGroup)
  • buildPopup function popup builder
  • optsPopup popup options
  • buildIcon function icon builder

Caching:

  • minShift min shift for update data(in meters)
  • updateOutBounds request new data only if current bounds higher than last bounds
  • precision number of digit send to server for lat,lng precision

Demos:

http://labs.easyblog.it/maps/leaflet-layerjson

Source:

Github
Bitbucket
NPM
Atmosphere

This plugin support Grunt for building process. Therefore the deployment require NPM installed in your system.

After you've made sure to have npm working, run this in command line:

npm install
grunt