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Showing content from https://developers.arcgis.com/esri-leaflet/api-reference/layers/feature-layer/ below:

L.esri.FeatureLayer | Esri Leaflet | Esri Developer

L.esri.FeatureLayer is used to visualize, style, query and edit vector geographic data hosted using ArcGIS Online, Location Platform, and Enterprise portals. Copyright text from the service is added to map attribution automatically.

Feature Layers reference an individual data source in either a parent Map Service or Feature Service that can contain multiple layers. You can see a sample Map Service URL below:

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https://sampleserver6.arcgisonline.com/arcgis/rest/services/Hurricanes/MapServer

This particular service includes two different data sources. The URL for the 'Hurricane Tracks' feature layer will end in a number (representing its position among the other layers).

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https://sampleserver6.arcgisonline.com/arcgis/rest/services/Hurricanes/MapServer/1

Feature Layer URLs always end in a number (ex: /FeatureServer/{LAYER_ID} or /MapServer/{LAYER_ID}).

You can use your portal to create a new feature service based on a CSV, Shapefile, GeoJSON, or other data types. To learn more, go to Publish hosted feature layers.

L.esri.FeatureLayer divides the current map extent into a grid of individual cells and uses them to fire queries to fetch nearby features. This technique is comparable to MODE_ONDEMAND in the ArcGIS API for JavaScript.

If you want your FeatureLayer to display the symbology defined in the map or feature service, you need to use the Esri Leaflet Renderers plugin.

Constructor Constructor Description L.esri.featureLayer(<Object> options) You must pass a url to a Feature Layer in your options Options Option Type Description url String Required The URL to the Feature Layer . pointToLayer(<GeoJSON Feature> feature, <LatLng> latlng) Function Function that will be used for creating layers for GeoJSON points. If the option is not specified, simple markers will be created). For point layers, custom panes should be passed through pointToLayer sample here . 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 Provides an opportunity to introspect individual GeoJSON features in the layer. where String An optional expression to filter features server side. String values should be denoted using single quotes ie: where: "FIELDNAME = 'field value'"; More information about valid SQL syntax can be found here. maxZoom Number Closest zoom level the layer will be displayed on the map. sample: maxZoom:19 minZoom Number Furthest zoom level the layer will be displayed on the map. sample: minZoom:3 cacheLayers Boolean Will remove layers from the internal cache when they are removed from the map. fields Array An array of fieldnames to pull from the service. Includes all fields by default. You should always specify 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. Requires the Feature Layer to be time enabled. to Date When paired with from defines the time range of features to display. Requires 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 'server' (default) or 'client' Determines where features are filtered by time. By default features will be filtered by the server. If set to 'client' all features are requested and filtered by the app before display. simplifyFactor Number How much to simplify polygons and polylines. A higher value gives better performance, a lower value gives a 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. apikey String If you pass an api key in your options it will be included in all requests to the service. token String If you pass a token in your options it will be included in all requests to the service. 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. renderer L.svg() or L.canvas() The vector renderer to use to draw the service. Usually L.svg() is preferable but setting to L.canvas() can have performance benefits for large polygon layers. isModern Boolean Set this to false if your own service supports GeoJSON as an output format but you'd like to ask for Geoservices JSON instead. ignoreRenderer Boolean When utilizing esri-leaflet-renderers '2.0.2' or above, this option makes it possible to override the symbology defined by the service itself. fetchAllFeatures Boolean When true, the Feature Layer will make multiple requests to get all the data if the query exceeds the transfer limit (paging size). This should be used when working with large numbers of features. Default: false. 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.FeatureLayer also fires all L.esri.FeatureLayerService events.

In addition to the events above, L.esri.FeatureLayer also fires the following Mouse Events click, dblclick, mouseover, mouseout, mousemove, and contextmenu and the following 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({
    color: 'white'
})

featureLayer.setStyle(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. eachFeature(<Function> fn, <Object> context) this

Calls the passed function against every feature. The function will be passed the layer that represents the feature.

fl.on('load', iterateFeatures);
function iterateFeatures () {
    fl.eachFeature(function(layer) {
    console.log(layer.feature);
    });
}

eachActiveFeature(<Function> fn, <Object> context) this

Calls the passed function against every feature that is currently being displayed.

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 Polyline 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.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);
});

addFeature(<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 the portal 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.

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 the portal or the user who created the service.
Requires the Update capability be enabled on the service. You can check if this operation exists by checking the metadata of your service under capabilities.

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 the portal or the user who created the service.
Requires the Delete capability be enabled on the service. You can check if this operation exists by checking the metadata of your service under capabilities.

deleteFeatures(<Array of String or Integers> ids, <Function> callback, <Object> context) this

Removes an array of features with the provided ids from the feature layer. This will also remove the features from the map if they exist.

Requires authentication as a user who has permission to edit the service in the portal or the user who created the service.
Requires the Delete capability be enabled on the service. You can check if this operation exists by checking the metadata of your service under capabilities.

redraw(<String or Integer> id) this

Redraws a feature with the provided id from the feature layer.

refresh() this

Redraws all features from the feature layer that exist on the map.

Example

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    var trailheads = L.esri
      .featureLayer({
        url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads_Styled/FeatureServer/0"
      });

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