OpenLayers

Class: VectorSource

ol/source/Vector~VectorSource 


import VectorSource from 'ol/source/Vector';

Provides a source of features for vector layers. Vector features provided by this source are suitable for editing. See module:ol/source/VectorTile~VectorTile for vector data that is optimized for rendering.

new VectorSource(opt_options)

source/Vector.js, line 166
Name Type Description
options

Vector source options.

Name Type Description
attributions module:ol/source/Source~AttributionLike

Attributions.
features Array.<module:ol/Feature~Feature> | module:ol/Collection~Collection.<module:ol/Feature~Feature>

Features. If provided as module:ol/Collection, the features in the source and the collection will stay in sync.
format module:ol/format/Feature~FeatureFormat

The feature format used by the XHR feature loader when url is set. Required if url is set, otherwise ignored.
loader module:ol/featureloader~FeatureLoader

The loader function used to load features, from a remote source for example. If this is not set and url is set, the source will create and use an XHR feature loader.

Example:

import {Vector} from 'ol/source';
import {GeoJSON} from 'ol/format';
import {bbox} from 'ol/loadingstrategy';

var vectorSource = new Vector({
  format: new GeoJSON(),
  loader: function(extent, resolution, projection) {
     var proj = projection.getCode();
     var url = 'https://ahocevar.com/geoserver/wfs?service=WFS&' +
         'version=1.1.0&request=GetFeature&typename=osm:water_areas&' +
         'outputFormat=application/json&srsname=' + proj + '&' +
         'bbox=' + extent.join(',') + ',' + proj;
     var xhr = new XMLHttpRequest();
     xhr.open('GET', url);
     var onError = function() {
       vectorSource.removeLoadedExtent(extent);
     }
     xhr.onerror = onError;
     xhr.onload = function() {
       if (xhr.status == 200) {
         vectorSource.addFeatures(
             vectorSource.getFormat().readFeatures(xhr.responseText));
       } else {
         onError();
       }
     }
     xhr.send();
   },
   strategy: bbox
 });
overlaps boolean (defaults to true)

This source may have overlapping geometries. Setting this to false (e.g. for sources with polygons that represent administrative boundaries or TopoJSON sources) allows the renderer to optimise fill and stroke operations.
strategy module:ol/source/Vector~LoadingStrategy

The loading strategy to use. By default an module:ol/loadingstrategy~all strategy is used, a one-off strategy which loads all features at once.
url string | module:ol/featureloader~FeatureUrlFunction

Setting this option instructs the source to load features using an XHR loader (see module:ol/featureloader~xhr). Use a string and an module:ol/loadingstrategy~all for a one-off download of all features from the given URL. Use a module:ol/featureloader~FeatureUrlFunction to generate the url with other loading strategies. Requires format to be set as well. When default XHR feature loader is provided, the features will be transformed from the data projection to the view projection during parsing. If your remote data source does not advertise its projection properly, this transformation will be incorrect. For some formats, the default projection (usually EPSG:4326) can be overridden by setting the dataProjection constructor option on the format. Note that if a source contains non-feature data, such as a GeoJSON geometry or a KML NetworkLink, these will be ignored. Use a custom loader to load these.
useSpatialIndex boolean (defaults to true)

By default, an RTree is used as spatial index. When features are removed and added frequently, and the total number of features is low, setting this to false may improve performance.

Note that module:ol/source/Vector~VectorSource#getFeaturesInExtent, module:ol/source/Vector~VectorSource#getClosestFeatureToCoordinate and module:ol/source/Vector~VectorSource#getExtent cannot be used when useSpatialIndex is set to false, and module:ol/source/Vector~VectorSource#forEachFeatureInExtent will loop through all features.

When set to false, the features will be maintained in an module:ol/Collection, which can be retrieved through module:ol/source/Vector~VectorSource#getFeaturesCollection.
wrapX boolean (defaults to true)

Wrap the world horizontally. For vector editing across the -180° and 180° meridians to work properly, this should be set to false. The resulting geometry coordinates will then exceed the world bounds.
Fires:

Subclasses

Extends

Methods

addFeature(feature)

source/Vector.js, line 293

Add a single feature to the source. If you want to add a batch of features at once, call #addFeatures() instead. A feature will not be added to the source if feature with the same id is already there. The reason for this behavior is to avoid feature duplication when using bbox or tile loading strategies. Note: this also applies if an module:ol/Collection is used for features, meaning that if a feature with a duplicate id is added in the collection, it will be removed from it right away.

Name Type Description
feature module:ol/Feature~Feature.<Geometry>

Feature to add.

addFeatures(features)

source/Vector.js, line 377

Add a batch of features to the source.

Name Type Description
features Array.<module:ol/Feature~Feature.<Geometry>>

Features to add.

changed() inherited

Observable.js, line 36

Increases the revision counter and dispatches a 'change' event.

clear(opt_fast)

source/Vector.js, line 484

Remove all features from the source.

Name Type Description
fast boolean

Skip dispatching of module:ol/source/Vector.VectorSourceEvent#removefeature events.

dispatchEvent(event){boolean|undefined} inherited

events/Target.js, line 96

Dispatches an event and calls all listeners listening for events of this type. The event parameter can either be a string or an Object with a type property.

Name Type Description
event Object | module:ol/events/Event~BaseEvent | string

Event object.
Returns:
false if anyone called preventDefault on the event object or if any of the listeners returned false.

forEachFeature(callback){T|undefined}

source/Vector.js, line 530

Iterate through all features on the source, calling the provided callback with each one. If the callback returns any "truthy" value, iteration will stop and the function will return the same value. Note: this function only iterate through the feature that have a defined geometry.

Name Type Description
callback function

Called with each feature on the source. Return a truthy value to stop iteration.
Returns:
The return value from the last call to the callback.

forEachFeatureInExtent(extent, callback){T|undefined}

source/Vector.js, line 583

Iterate through all features whose bounding box intersects the provided extent (note that the feature's geometry may not intersect the extent), calling the callback with each feature. If the callback returns a "truthy" value, iteration will stop and the function will return the same value.

If you are interested in features whose geometry intersects an extent, call the #forEachFeatureIntersectingExtent() method instead.

When useSpatialIndex is set to false, this method will loop through all features, equivalent to #forEachFeature().

Name Type Description
extent module:ol/extent~Extent

Extent.
callback function

Called with each feature whose bounding box intersects the provided extent.
Returns:
The return value from the last call to the callback.

forEachFeatureIntersectingExtent(extent, callback){T|undefined}

source/Vector.js, line 607

Iterate through all features whose geometry intersects the provided extent, calling the callback with each feature. If the callback returns a "truthy" value, iteration will stop and the function will return the same value.

If you only want to test for bounding box intersection, call the #forEachFeatureInExtent() method instead.

Name Type Description
extent module:ol/extent~Extent

Extent.
callback function

Called with each feature whose geometry intersects the provided extent.
Returns:
The return value from the last call to the callback.

get(key){*} inherited

Object.js, line 119

Gets a value.

Name Type Description
key string

Key name.
Returns:
Value.

getClosestFeatureToCoordinate(coordinate, opt_filter){module:ol/Feature~Feature.<Geometry>}

source/Vector.js, line 708

Get the closest feature to the provided coordinate.

This method is not available when the source is configured with useSpatialIndex set to false.

Name Type Description
coordinate module:ol/coordinate~Coordinate

Coordinate.
filter function

Feature filter function. The filter function will receive one argument, the feature and it should return a boolean value. By default, no filtering is made.
Returns:
Closest feature.

getExtent(opt_extent){module:ol/extent~Extent}

source/Vector.js, line 761

Get the extent of the features currently in the source.

This method is not available when the source is configured with useSpatialIndex set to false.

Name Type Description
extent module:ol/extent~Extent

Destination extent. If provided, no new extent will be created. Instead, that extent's coordinates will be overwritten.
Returns:
Extent.

getFeatureById(id){module:ol/Feature~Feature.<Geometry>}

source/Vector.js, line 775

Get a feature by its identifier (the value returned by feature.getId()). Note that the index treats string and numeric identifiers as the same. So source.getFeatureById(2) will return a feature with id '2' or 2.

Name Type Description
id string | number

Feature identifier.
Returns:
The feature (or null if not found).

getFeatures(){Array.<module:ol/Feature~Feature.<Geometry>>}

source/Vector.js, line 642

Get all features on the source in random order.

Returns:
Features.

getFeaturesAtCoordinate(coordinate){Array.<module:ol/Feature~Feature.<Geometry>>}

source/Vector.js, line 664

Get all features whose geometry intersects the provided coordinate.

Name Type Description
coordinate module:ol/coordinate~Coordinate

Coordinate.
Returns:
Features.

getFeaturesCollection(){module:ol/Collection~Collection.<module:ol/Feature~Feature.<Geometry>>}

source/Vector.js, line 632

Get the features collection associated with this source. Will be null unless the source was configured with useSpatialIndex set to false, or with an module:ol/Collection as features.

Returns:
The collection of features.

getFeaturesInExtent(extent){Array.<module:ol/Feature~Feature.<Geometry>>}

source/Vector.js, line 685

Get all features whose bounding box intersects the provided extent. Note that this returns an array of all features intersecting the given extent in random order (so it may include features whose geometries do not intersect the extent).

When useSpatialIndex is set to false, this method will return all features.

Name Type Description
extent module:ol/extent~Extent

Extent.
Returns:
Features.

getFormat(){module:ol/format/Feature~FeatureFormat|undefined}

source/Vector.js, line 799

Get the format associated with this source.

Returns:
The feature format.

getKeys(){Array.<string>} inherited

Object.js, line 132

Get a list of object property names.

Returns:
List of property names.

getProjection(){module:ol/proj/Projection~Projection} inherited

source/Source.js, line 119

Get the projection of the source.

Returns:
Projection.

getProperties(){Object.<string, *>} inherited

Object.js, line 141

Get an object of all property names and values.

Returns:
Object.

getRevision(){number} inherited

Observable.js, line 47

Get the version number for this object. Each time the object is modified, its version number will be incremented.

Returns:
Revision.

getState(){module:ol/source/State} inherited

source/Source.js, line 136

Get the state of the source, see module:ol/source/State~State for possible states.

Returns:
State.

getUrl(){string|module:ol/featureloader~FeatureUrlFunction|undefined}

source/Vector.js, line 818

Get the url associated with this source.

Returns:
The url.

hasFeature(feature){boolean}

source/Vector.js, line 873

Returns true if the feature is contained within the source.

Name Type Description
feature module:ol/Feature~Feature.<Geometry>

Feature.
Returns:
Has feature.

on(type, listener){module:ol/events~EventsKey|Array.<module:ol/events~EventsKey>} inherited

Observable.js, line 60

Listen for a certain type of event.

Name Type Description
type string | Array.<string>

The event type or array of event types.
listener function

The listener function.
Returns:
Unique key for the listener. If called with an array of event types as the first argument, the return will be an array of keys.

once(type, listener){module:ol/events~EventsKey|Array.<module:ol/events~EventsKey>} inherited

Observable.js, line 82

Listen once for a certain type of event.

Name Type Description
type string | Array.<string>

The event type or array of event types.
listener function

The listener function.
Returns:
Unique key for the listener. If called with an array of event types as the first argument, the return will be an array of keys.

refresh() inherited

source/Source.js, line 151

Refreshes the source. The source will be cleared, and data from the server will be reloaded.

removeFeature(feature)

source/Vector.js, line 954

Remove a single feature from the source. If you want to remove all features at once, use the #clear() method instead.

Name Type Description
feature module:ol/Feature~Feature.<Geometry>

Feature to remove.

removeLoadedExtent(extent)

source/Vector.js, line 932

Remove an extent from the list of loaded extents.

Name Type Description
extent module:ol/extent~Extent

Extent.

set(key, value, opt_silent) inherited

Object.js, line 164

Sets a value.

Name Type Description
key string

Key name.
value *

Value.
silent boolean

Update without triggering an event.

setAttributions(attributions) inherited

source/Source.js, line 162

Set the attributions of the source.

Name Type Description
attributions module:ol/source/Source~AttributionLike | undefined

Attributions. Can be passed as string, Array<string>, module:ol/source/Source~Attribution, or undefined.

setLoader(loader)

source/Vector.js, line 1013

Set the new loader of the source. The next render cycle will use the new loader.

Name Type Description
loader module:ol/featureloader~FeatureLoader

The loader to set.

setProperties(values, opt_silent) inherited

Object.js, line 183

Sets a collection of key-value pairs. Note that this changes any existing properties and adds new ones (it does not remove any existing properties).

Name Type Description
values Object.<string, *>

Values.
silent boolean

Update without triggering an event.

setUrl(url)

source/Vector.js, line 1022

Points the source to a new url. The next render cycle will use the new url.

Name Type Description
url string | module:ol/featureloader~FeatureUrlFunction

Url.

un(type, listener) inherited

Observable.js, line 101

Unlisten for a certain type of event.

Name Type Description
type string | Array.<string>

The event type or array of event types.
listener function

The listener function.

unset(key, opt_silent) inherited

Object.js, line 195

Unsets a property.

Name Type Description
key string

Key name.
silent boolean

Unset without triggering an event.