topic How to highlight when when dealing with MapImageLayer in ArcGIS JavaScript Maps SDK Questions

How to highlight when when dealing with MapImageLayer

gpei_ahuang — Tue, 09 Aug 2022 18:54:54 GMT

I have a feature class that I applied complex labelling rules. In order for those labelling rules to translate on a map, I had to publish the feature class as a MapImageLayer. I have search for the javascript equivalent labellingInfo setting but it seems that they do not existing yet in the 4.x JS library.

Right now, I am dealing with highlighting by creating individual graphics and added it either into a graphics layer or MapView.graphics. Is there a native way such as layerView.highlight() for MapImageLayer?

Re: How to highlight when when dealing with MapImageLayer

LukeCalladine — Wed, 10 Aug 2022 13:53:28 GMT

Forgive me if I am misunderstanding - would you be looking to use the labellingInfo setting in the Sublayer class for a MapImageLayer?

https://developers.arcgis.com/javascript/latest/api-reference/esri-layers-support-Sublayer.html

Re: How to highlight when when dealing with MapImageLayer

gpei_ahuang — Wed, 10 Aug 2022 14:02:33 GMT

Hi Luke

Thanks for writing back. Unfortunately, that is not what I am looking for.

I'm looking for highlighting methods similar to FeatureLayerView.highlight() but for LayerView create for MapImageLayer.

I have explored directly changing labellingInfo but it just does not have the same parameters that produces the same labelling results. That is why I am using MapImageLayer for my map to retain the labelling parameters I defined in ArcGIS Pro.

Re: How to highlight when when dealing with MapImageLayer

LukeCalladine — Wed, 10 Aug 2022 14:07:27 GMT

Ah okay, no worries - if it helps I think I handle my highlighting of MapImageLayers in a similar same way by managing the related Graphics - I would interested if there is a native way, but I doubt it...

Re: How to highlight when when dealing with MapImageLayer

gpei_ahuang — Wed, 10 Aug 2022 14:11:35 GMT

I was considering overlaying the same layer again just for the highlighting purpose. But with the amount of rendering involved, the map would be very inefficient.

Re: How to highlight when when dealing with MapImageLayer

nadja — Tue, 11 Oct 2022 12:44:43 GMT

Hi @gpei_ahuang

Have you found a solution yet? I'm having the exact same question.

Re: How to highlight when when dealing with MapImageLayer

gpei_ahuang — Tue, 11 Oct 2022 13:52:33 GMT

There is still no solution specific to highlighting MapImageLayer. I don't think highlighting for MapImageLayer is part of the core function.

I ended up adding another the feature class layer from the MapImageLayer that I want highlight:

- remove all the labels

- redefine the rendering symbology

- define definitionExpression to use as a filter or (layerView.filter if you offload processing on client side)

- visible: false to start and toggle on and off as needed to visualize highlight

Re: How to highlight when when dealing with MapImageLayer

WongChunKang — Tue, 26 Mar 2024 06:11:47 GMT

The following hack worked for me

// Tested in ArcGIS JS SDK 4.27.6 const map = new Map({ ... }); const view = new MapView({ ... }); const mapImageLayer = new MapImageLayer({ ... }); map.add(mapImageLayer); await mapImageLayer.load(); // In TypeScript, be prepared to use `any` type from here onwards const layerView = view.layerViews.find((lv) => lw.layer.id === mapImageLayer.id); layerView.highlight([ ... ]); // An array of Graphic object

Re: How to highlight when when dealing with MapImageLayer

AndreV — Mon, 27 Jan 2025 20:52:46 GMT

Thanks @WongChunKang for posting this snippet. This helped me a lot in 2D. Unfortunately in 3D I get an layerView with type="map-image-3d" which does not support highlight function. Any hints on that? Is this a bug or net yet implemented?