How does the legend work in ArcGIS JavaScript?

How does the legend work in ArcGIS JavaScript?

The legend will respect scale dependencies and only display layers and sublayers that are currently visible in the map. The legend automatically updates if the visibility of a layer or sublayer changes. Optionally, either of these two behaviors can be turned off.

How to use the ArcGIS API for JavaScript?

Since: ArcGIS API for JavaScript 4.0. The Legend widget displays labels and symbols for layers in a map. Labels and their corresponding symbols depend on the values set in the Renderer of the layer. The legend will only display layers and sublayers that are visible in the view. The legend automatically updates when.

What is the default value of align _ left in ArcGIS?

The default value of ALIGN_LEFT displays the symbol on the left side of the label. Valid values are: When false, the legend will not automatically update if the map changes scale or when layers are added are removed from the map. Call refresh to force a legend update.

How to show the basemap layers in the legend?

Indicates whether to show the Basemap layers in the Legend. If you set this property to true and specify layerInfos, the basemap layers you want included in the legend must also be specified in layerInfos. The ID or node representing the DOM element containing the widget. This property can only be set once.

Is the ArcGIS API for JavaScript based on CSV?

Since: ArcGIS API for JavaScript 4.1 The CSVLayer is a point layer based on a CSV file (.csv,.txt). CSV is a plain-text file format used to represent tabular data, including geographic point features (latitude, longitude). Typically the latitude coordinate is the Y value, and the longitude coordinate is the X value.

Can a csvlayer be added without a basemap?

CSVLayer cannot be added to a Map without a basemap. Edits are applied on the client not posted to the server. The feature layer generates a unique object id for new features. Does not support queries that need to be performed on the server, such as queries with a where clause or non-extent based spatial queries.

How do you change layer name in ESRI?

You can also do a slow double click on the layer name in the TOC so that the name is highlighted in a box and enter a new name, similar to renaming a file in Windows Explorer. You can also change the symbology labels under the Label heading on the Symbology tab.

How are labels set in the legend Dijit?

The legend dijit displays a label and symbol for some or all of the layers in the map. The label and symbol is based on the symbol or renderer for each layer. To view an example of how to set the labels in the legend using a renderer, see this sample .

How to create a legend for a map?

Use the Legend widget to build a legend that displays some or all of the layers in the map. To create a new legend widget specify the map and the HTML element where the legend will display. Optionally you can provide a list of layers to display in the legend. If no layers are specified all the layers will display in the legend.

How do you reorder legend items in ArcGIS Pro?

Reorder legend items by expanding the legend in the Contents pane to see the legend items. Drag items up or down in the list to reorder them. If the Layer order option is checked for the legend, reordering is disabled. Instead, the legend items are kept in the same order as the layers on the map.

How to get an arcgisdynamicmapservicelayer sample url?

If the first layer added to the map is an ArcGISDynamicMapServiceLayer, the map will take on the projection of this layer. Search for samples that use this class. new ArcGISDynamicMapServiceLayer (url, options?)

How to use the ArcGIS Server REST API?

Allows you to work with a dynamic map service resource exposed by the ArcGIS Server REST API. A dynamic map service generates images on the fly. For cached map services, see ArcGISTiledMapServiceLayer . If the first layer added to the map is an ArcGISDynamicMapServiceLayer, the map will take on the projection of this layer.

How is a featurelayer created in ArcGIS Online?

A FeatureLayer is a single layer that can be created from a Map Service or Feature Service; ArcGIS Online or ArcGIS Enterprise portal items; or from an array of client-side features. The layer can be either a spatial (has geographic features) or non-spatial (table).

What kind of layers does the legend widget support?

Currently, the legend widget does not support the following layer types: ElevationLayer , GraphicsLayer , IntegratedMeshLayer , KMLLayer , MapNotesLayer , OpenStreetMapLayer , VectorTileLayer, and WebTileLayer. 3D symbols with more than one symbol layer are not supported. DictionaryRenderer is not supported.

What do you need to know about legend in JavaScript?

Collection of ActiveLayerInfo objects used by the legend view to display data in the legend. Indicates whether to show the Basemap layers in the Legend. The ID or node representing the DOM element containing the widget. The name of the class. Indicates the heading level to use for the legend title. The widget’s default CSS icon class.

Why are my legend elements not showing up in the legend?

By default, a layer’s legend elements will not render in the legend given the following conditions: The layer’s legendEnabled property is set to false. If the view’s scale is outside the visibility range defined by the layer’s minScale and maxScale properties.