L.esri.Layers.FeatureLayer

L.esri.Layer.FeatureLayer is used to visualize and query vector geographic data hosted in ArcGIS Feature Layers. These layers are hosted as a part of Feature Services on either ArcGIS Online or ArcGIS Server.

Feature Layers are provided by Feature Services which can contain multupile layers. Feature Layers expose vector geographic information as a web service that can be visualized, styled, queried and edited.

Here is a sample Feature Service URL 

http://services.arcgis.com/rOo16HdIMeOBI4Mb/arcgis/rest/services/Neighborhoods_pdx/

This particular service contains only one Feature Layer. Here is the Feature Layer URL 

http://services.arcgis.com/rOo16HdIMeOBI4Mb/ArcGIS/rest/services/Neighborhoods_pdx/FeatureServer/0

Note that the Feature Layer URL ends in /FeatureServer/{LAYER_ID}.

You can create a new empty feature service witha single layer on the ArcGIS for Devleopers website or you can use ArcGIS Online to create a Feature Service from a CSV or Shapefile.

Constructor

Constructor Description
new L.esri.Layers.FeatureLayer(<String> url, <Object> options)

L.esri.Layers.featureLayer(<String> url, <Object> options)

new L.esri.FeatureLayer(<String> url, <Object> options)

L.esri.featureLayer(<String> url, <Object> options)		 url should be the URL to the Feature Layer.

Options

Option Type Description
pointToLayer(<GeoJSON Feature> feature, <LatLng> latlng) Function Function that will be used for creating layers for GeoJSON points (if not specified, simple markers will be created).
style(<GeoJSON Feature> feature, <ILayer> layer) Function Function that will be used to get style options for vector layers created for GeoJSON features.
onEachFeature(<GeoJSON Feature> feature, <ILayer> layer) Function
where String A server side expression that will be evaluated to filter features. By default this will include all features in a service.
fields Array An array of metadata names to pull from the service. Includes all fields by default. You should always specifcy the name of the unique id for the service. Usually either 'FID' or 'OBJECTID'.
from Date When paired with to defines the time range of features to display. Required the Feature Layer to be time enabled.
to Date When paired with from defines the time range of features to display. Required the Feature Layer to be time enabled.
timeField false The name of the field to lookup the time of the feature. Can be an object like {start:'startTime', end:'endTime'} or a string like 'created'.
timeFilterMode 'client' or 'server' Determines where features are filtered by time. By default features will be filtered by the server. If set to 'client' all features are loaded and filtered on the client before display.
simplifyFactor Integer How much to simplify polygons and polylines. More means better performance, and less means more accurate representation.
precision Integer How many digits of precision to request from the server. Wikipedia has a great reference of digit precision to meters.
token String If you pass a token in your options it will included in all requests to the service. See working with authenticated services for more information.
proxy String URL of an ArcGIS API for JavaScript proxies or ArcGIS Resource Proxies to use for proxying POST requests.
useCors Boolean If this service should use CORS when making GET requests.

Events

Event Type Description
loading <LoadingEvent> Fires when new features start loading.
load <LoadEvent> Fires when all features in the current bounds of the map have loaded.
createfeature <CreateFeatureEvent> Fired when a feature from the Feature Layer is loaded for the first time.
removefeature <RemoveFeatureEvent> Fired when a feature on the layer is removed from the map.
addfeature <AddFeatureEvent> Fired when a previously removed feature is added back to the map.

L.esri.Layer.FeatureLayer also fires all L.esri.Service.FeatureLayer events.

In additon to these events L.esri.Layer.FeatureLayer also fires the following Mouse Events click, dblclick, mouseover, mouseout, mousemove, and contextmenu and the following the Popup Events popupopen and popupclose

Methods

Method Returns Description
setStyle(<PathOptions> style)

setStyle(<Function> style)		 this Sets the given path options to each layer that has a setStyle method. Can also be a Function that will receive a feature argument and should return Path Options 
featureLayer.setStyle(1, {
    color: white;
})
featureLayer.setStyle(1, function(feature){
    return {
    weight: feature.properties.pixelWidth
    };
})
setFeatureStyle(<String or Integer> id, <Function or Path Optionsa>> [object Object]) this Changes the style on a specfic feature.
resetStyle(<String or Integer> undefined) this Given the ID of a feature, reset that feature to the original style.
bindPopup(<Function> fn, <PopupOptions> popupOptions) this Defines a function that will return HTML to be bound to a popup on each feature. 
featureLayer.bindPopup(function(features){
  return "Name: " + features.properties.NAME;
});
unbindPopup() this Removed a popup previously bound with bindPopup.
eachFeature(<Function> fn, <Object> context) this Calls the passed function against every feature. The function will be passed the layer that represents the feature. 
featureLayer.eachFeature(function(layer){
  console.log(layer.feature.properties.NAME);
});
getFeature(<String or Integer> undefined id) Layer Given the id of a Feature return the layer on the map that represents it. This will usually be a Leaflet vector layer like Polygon or Polygon, or a Leaflet Marker.
getWhere() String Returns the current where setting
setWhere(<String> where, <Function> callback, <Object> context) this Sets the new where option and refreshes the layer to reflect the new where filter. Accepts an optional callback and function context.
getTimeRange() Array Returns the current time range as an array like [from, to]
setTimeRange(<Date> from, <Date> to, , <Function> callback, <Object> context) this Sets the current time filter applied to features. An optional callback is run upon completion if timeFilterMode is set to 'server'. Also accepts function context as the last argument.
authenticate(<String> token) this Authenticates this service with a new token and runs any pending requests that required a token.
query() this Returns a new L.esri.services.Query object that can be used to query this layer. Your callback function will be passed a GeoJSON FeatureCollection with the results or an error. 
featureLayer.query()
            .within(latlngbounds)
            .where("Direction = 'WEST'")
            .run(function(error, featureCollection){
                console.log(featureCollection);
            });
metadata(<Function> callback, <Object> context) this Requests metadata about this Feature Layer. Callback will be called with error and metadata. 
featureLayer.metadata(function(error, metadata){
  console.log(metadata);
});
createFeature(<GeoJSON Feature> feature, <Function> callback, <Object> context) this Adds a new feature to the feature layer. this also adds the feature to the map if creation is successful.
  • Requires authentication as a user who has permission to edit the service in ArcGIS Online or the user who created the service.
  • Requires the Create capability be enabled on the service. You can check if creation exists by checking the metadata of your service under capabilities in the metadata.
updateFeature(<GeoJSON Feature> feature, <Function> callback, <Object> context) this Update the provided feature on the Feature Layer. This also updates the feature on the map.
  • Requires authentication as a user who has permission to edit the service in ArcGIS Online or the user who created the service.
  • Requires the Update capability be enabled on the service. You can check if creation exists by checking the metadata of your service under capabilities in the metadata.
deleteFeature(<String or Integer> id, <Function> callback, <Object> context) this Remove the feature with the provided id from the feature layer. This will also remove the feature from the map if it exists.
  • Requires authentication as a user who has permission to edit the service in ArcGIS Online or the user who created the service.
  • Requires the Update capability be enabled on the service. You can check if creation exists by checking the metadata of your service under capabilities in the metadata.

Example

var map = L.map('map').setView([45.53,-122.64], 14);

L.esri.basemapLayer("Streets").addTo(map);

var busStops = L.esri.featureLayer('http://services.arcgis.com/rOo16HdIMeOBI4Mb/arcgis/rest/services/stops/FeatureServer/0/').addTo(map);

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