topic Re: Get layer name in layerList widget in ArcGIS JavaScript Maps SDK Questions

Get layer name in layerList widget

MichaelBoschert — Mon, 18 Oct 2021 14:46:34 GMT

Hey,

i just tried to add some actions to my layerlist widget. (increase/decrease opacity, zoom to extent)

In this example they called a special layer by name but i want to use this actions on each layer in my map.

Isn't there an easy way to define the selected Layer in the layerList widget?

I didn't find anything easy like "var layer = layerlist.selectedLayer"

Thank you

ReneRubalcava — Mon, 18 Oct 2021 15:16:27 GMT

The LayerList has selectedItems Collection you can watch for change events. The Item has a layer property you can reference.

MichaelBoschert — Mon, 18 Oct 2021 16:04:52 GMT

Thanks for your reply @ReneRubalcava

I tried with the following snippet;

layerList.on("trigger-action", (event) => {
layerList.selectedItems.watch("ListItem",layer =>{
console.log("do something");
});
});

But the console.log doesn't return anything.

ReneRubalcava — Mon, 18 Oct 2021 16:23:06 GMT

selectedItems is a Collection, so you can use ".on()" to listen for events, like this sample.

MichaelBoschert — Tue, 19 Oct 2021 08:41:48 GMT

Thanks again for your fast reply @ReneRubalcava

The Solution that works for me is;

layerList.on("trigger-action", (event) => {
var activeLayer = event.item.layer.name;
console.log(activeLayer);
});

Defining the 'name" in the layer definition...

MichaelKarikari1 — Tue, 01 Feb 2022 01:59:03 GMT

I was looking to do the same thing, but your excerpt didnt work for me. Would you be able to provide the exact syntax you used?

Thanks