Download layerview

The layer's LayerView is destroyed and no longer renders in a view. Layer Event Details layerview-create Inherited Event layerview-create Fires after the layer's LayerView is created and rendered in a view. Properties The view in which the layerView was created. The LayerView renderedin the view representing the layer in layer. See also View.whenLayerView() Example // This function will fire each time a layer view is created for this// particular view.layer.on("layerview-create", function(event){ // The LayerView for the layer that emitted this event event.layerView;}); layerview-create-error Inherited Event layerview-create-error Fires when an error emits during the creation of a LayerViewafter a layer has been added to the map. Properties The view that failed to create a layerview for the layeremitting this event. An error object describing why the layer view failed to create. See also View.whenLayerView() Example // This function fires when an error occurs during the creation of the layer's layerviewlayer.on("layerview-create-error", function(event) { console.error("LayerView failed to create for layer with the id: ", layer.id, " in this view: ", event.view);}); layerview-destroy Inherited Event layerview-destroy Fires after the layer's LayerView is destroyed and no longer renders in a view. Properties The view in which the layerView was destroyed. The destroyed LayerView representing the layer.

Parameters: a callback function and an errback function.The callback executes when the instance of the class loads. Theerrback executes if the instance of the class fails to load. Parameters optional The function to call when the promise resolves. optional The function to execute when the promise fails. Returns Type Description Promise Returns a new promise for the result of callback that may be used to chain additional functions. Example // Although this example uses MapView, any class instance that is a promise may use when() in the same waylet view = new MapView();view.when(function(){ // This function will execute once the promise is resolved}, function(error){ // This function will execute if the promise is rejected due to an error}); Event Overview Show inherited events Hide inherited events Name Type Summary Class {view: View,layerView: LayerView} Fires after the layer's LayerView is created and rendered in a view. Layer {view: View,error: Error} Fires when an error emits during the creation of a LayerView after a layer has been added to the map. Layer {view: View,layerView: LayerView} Fires after the layer's LayerView is destroyed and no longer renders in a view. Layer Event Details layerview-create Inherited Event layerview-create Fires after the layer's LayerView is created and rendered in a view. Properties The view in which the layerView was created. The LayerView renderedin the view representing the layer in layer. See also View.whenLayerView() Example // This function will fire each time a layer view is created for this// particular view.layer.on("layerview-create", function(event){ // The LayerView for the layer that emitted this event event.layerView;}); layerview-create-error Inherited Event layerview-create-error Fires when an error emits during the creation of a LayerViewafter a layer has been added to the map. Properties The view that failed to create a layerview for the layeremitting this event. An error object describing why the

Class: BaseLayerViewGL2D --> BaseLayerViewGL2D --> AMD: require(["esri/views/2d/layers/BaseLayerViewGL2D"], (BaseLayerViewGL2D) => { /* code goes here */ }); ESM: import BaseLayerViewGL2D from "@arcgis/core/views/2d/layers/BaseLayerViewGL2D.js"; Class: esri/views/2d/layers/BaseLayerViewGL2D Since: ArcGIS Maps SDK for JavaScript 4.11 Represents the LayerView of a Layerafter it has been added to a Map with a MapView. In contrast to therelated class BaseLayerView2D, this one exposes WebGLrendering capabilities. Important notesThis interface is experimental. Please read the following information carefully before using it in a product.Due to the nature of WebGL it is not possible to fully sandbox user-supplied code, and its malfunctions can affect theperformance, visual quality and even stability of the entire MapView. For this reason, Esridoes not provide any support for issues related to WebGL rendering in custom rendering code, or for issues that arise inMapView rendering while using custom rendering code.This class may be extended to create a custom LayerView for a Layer.A LayerView is created on demand by the MapView when a layer isadded the to list of layers of its map.The subclass can implement multiple functions of the LayerView lifecycle.First, the attach() method is called when the LayerView is about to start drawing the layer's content; itis usually responsible for resource allocation.Then during the life of the LayerView the render() method is called once per frame; it must completedrawing before returning.Finally the detach() method is called after the layer is removed from the map; it releases all allocatedresources and stops on-going requests.Each of these functions has access to the MapView's WebGL context through the instance propertythis.context.

VisibleAtCurrentScale Booleanreadonly Since: ArcGIS Maps SDK for JavaScript 4.30 LayerView since 4.0, visibleAtCurrentScale added at 4.30. When true, the layer is visible in the view at the current scale. This applies to layers that have minScale and maxScale properties set. Known LimitationsThis property is not supported in 3D SceneView tiled layers. Default Value:true See also visibleAtCurrentTimeExtent suspended visibleAtCurrentTimeExtent Inherited Property visibleAtCurrentTimeExtent Booleanreadonly Since: ArcGIS Maps SDK for JavaScript 4.30 LayerView since 4.0, visibleAtCurrentTimeExtent added at 4.30. Default Value:true See also visibleAtCurrentScale suspended Method Overview Show inherited methods Hide inherited methods Name Return Type Summary Class Adds one or more handles which are to be tied to the lifecycle of the object.Accessor Method called after the LayerView is created and right before it starts drawing the layer's content.BaseLayerViewGL2D Bind the designated rendering output surface and restore the correct viewport.BaseLayerViewGL2D Method called after the layer is removed and the LayerView is about to be removed.BaseLayerViewGL2D RenderTargetGet the designated rendering output surface and corresponding viewport configuration.BaseLayerViewGL2D BooleanReturns true if a named group of handles exist.Accessor PromiseViewHit[]|null|undefined)>Method to implement that is responsible for providing objects hit at the specified screen coordinates.BaseLayerViewGL2D BooleanisFulfilled() may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected).LayerView BooleanisRejected() may be used to verify if creating an instance of the class is rejected.LayerView BooleanisResolved() may be used to verify if creating an instance of the class is resolved.LayerView Removes a group of handles owned by the object.Accessor The method to implement that

Savingunsupported layers or layers with unsupported content, such as unsupported symbology. Returns Type Description PromisePortalItem> When resolved, returns the portal item to which the layer is saved. Example const portalItem = await layer.save(); saveAs Method saveAs(portalItem, options){PromisePortalItem>} Since: ArcGIS Maps SDK for JavaScript 4.28 GroupLayer since 4.0, saveAs added at 4.28. Saves the layer to a new portal item in the Portal authenticated within the user's current session. Parameters Specification The portal item to which the layer will be saved. optional Various options for saving the layer. Specification optional The portal folder where the layer's portal item will be saved. optional Indicates whether to ignore saving unsupportedlayers or layers with unsupported content, such as unsupported symbology. Returns Type Description PromisePortalItem> When resolved, returns the portal item to which the layer is saved. Example const portalItem = new PortalItem();await layer.saveAs(portalItem); when Inherited Method when(callback, errback){Promise} Since: ArcGIS Maps SDK for JavaScript 4.6 Layer since 4.0, when added at 4.6. when() may be leveraged once an instance of the class is created. This method takes two input parameters: a callback function and an errback function.The callback executes when the instance of the class loads. Theerrback executes if the instance of the class fails to load. Parameters optional The function to call when the promise resolves. optional The function to execute when the promise fails. Returns Type Description Promise Returns a new promise for the result of callback that may be used to chain additional functions. Example // Although this example uses MapView, any class instance that is a promise may use when() in the same waylet view = new MapView();view.when(function(){ // This function will execute once the promise is resolved}, function(error){ // This function will execute if the promise is rejected due to an error}); Event Overview Show inherited events Hide inherited events Name Type Summary Class {view: View,layerView: LayerView} Fires after the layer's LayerView is created and rendered in a view. Layer {view: View,error: Error} Fires when an error emits during the creation of a LayerView after a layer has been added to the map. Layer {view: View,layerView: LayerView} Fires after

I'd like to get the count of features, without making another call the the server, after the definition expression of a feature layer is changed. I'm using JSAPI 4.2 4.2esrijavascriptweb All Posts Previous Topic Next Topic 1 Solution After reading through the docs more finally came up with a solution: service.getFeatureLayerViewCount = function (featureLayer) { var deferredFeatures = $q.defer(); var layerViewPromise = _view.whenLayerView(featureLayer); layerViewPromise.then(function (layerView) { var handle = layerView.watch("updating", function (newVal, oldVal, prop, target) { if (!newVal) { // console.log(prop + " CHANGED FROM " + oldVal + " TO " + newVal); layerView.queryFeatureCount().then(function (response) { // console.log(response); deferredFeatures.resolve(response); }, function (error) { console.error(error); deferredFeatures.reject(error); }); handle.remove(); } }); }); return deferredFeatures.promise; }I'm using the angular-esri libraries, but the idea is the same. Call that after the definitionExpression is set. I don't think you can even get a count from the featurelayer, had to get it from the featurelayerview. I just had to save that extra call to the server.. Thanks! 4 Replies Daniel, There is not. But a work around is to attach a listen for the update-end right before you use setDefinitionExpression and then remove the update-end event listener inside the handler function.var updateEndHandlerEvt = featureLayer.on('update-end', updateEndHandler);featureLayer.setDefinitionExpression("blah blah");function updateEndHandler(){ updateEndHandlerEvt.remove(); //now do something since the definition expression is applied}‍‍‍‍‍‍‍‍ Sorry, I should have been more clear in my main post. I'm on 4.2, I only put the version in the hashtag section. I'll update the main question.I don't see that even in 4.2, I do see a "layerview-create" on the FeatureLayer, but I already tried that and it didn't hit it.Any other ideas? Thanks!DJ After reading through the docs more finally came up with a solution: service.getFeatureLayerViewCount = function (featureLayer) { var deferredFeatures = $q.defer(); var layerViewPromise = _view.whenLayerView(featureLayer); layerViewPromise.then(function (layerView) { var handle = layerView.watch("updating", function (newVal, oldVal, prop, target) { if (!newVal) { // console.log(prop + " CHANGED FROM " + oldVal + " TO " + newVal); layerView.queryFeatureCount().then(function (response) { // console.log(response); deferredFeatures.resolve(response); }, function (error) { console.error(error); deferredFeatures.reject(error); }); handle.remove(); } }); }); return deferredFeatures.promise; }I'm using the angular-esri libraries, but the idea is the same. Call that after the definitionExpression is set. I don't think you can even get a count from the featurelayer, had to get it from the featurelayerview. I just had to save that extra call to the server.. Thanks! I have this exact issue, but it doesn't seem that the event handler for "on-set-definition-expression-complete" has been added. Any other ideas for a simple implementation? It seems the definition expression will break out the query into batches. I need to know when they are all done resolving.