topic Re: Incorrect sample code for labelling in ArcGIS JavaScript Maps SDK Questions

Incorrect sample code for labelling

TedZhou — Mon, 13 Jan 2025 20:39:20 GMT

The sample code

https://developers.arcgis.com/javascript/latest/sample-code/layers-subtypegrouplayer/

seems to be incorrect.

If we change :

item.layer.labelsVisible = true;

the labels are shown as below:

ArcGIS users as us intend to learn what the following expression exactly means from ArcGIS team actually.

labelExpression: "$feature.assetgroup"

The sample code just confused me.

ArcGIS team did great work.

Re: Incorrect sample code for labelling

KenBuja — Mon, 13 Jan 2025 21:03:14 GMT

I think what the sample is doing is showing how to do different things with the layers. If you click the gear icon on a layer, the "Labels" button will show or hide the labels and the "unique" button will symbolize the data with a simple renderer or a unique-value renderer.

The labelExpression seems to be a mistake. If you replace that line with

labelExpressionInfo: { expression: "$feature.assetgroup" }

the labels show unique information

If you find errors in the sample code, it's more helpful to give feedback directly to Esri about this. To do that, scroll to the bottom of the page and click the thumbs down icon. This will bring up a dialog to send a message to the team.

Re: Incorrect sample code for labelling

TedZhou — Mon, 13 Jan 2025 21:12:27 GMT

Thanks for your time and kind efforts.

Re: Incorrect sample code for labelling

KenBuja — Mon, 13 Jan 2025 21:14:04 GMT

After a little more testing, you can also change it to this to get the same result

labelExpression: "[assetgroup]"

Re: Incorrect sample code for labelling

TedZhou — Mon, 13 Jan 2025 21:15:21 GMT

That is a reasonable design. Thanks for your great assistance.