topic How to set BaseMapLayer opacity? in ArcGIS JavaScript Maps SDK Questions

How to set BaseMapLayer opacity?

StephenLead — Sun, 12 Dec 2021 08:22:16 GMT

The reference for BasemapLayer says that it includes an opacity setting, however I'm having problems getting it to work.

Using the sample here I add a setting to specify the opacity:

function createBasemapGallery(){
        //Manually create a list of basemaps to display
        var basemaps = [];
        var basemapRoad = new esri.dijit.Basemap({
          layers: [new esri.dijit.BasemapLayer({
            type: "BingMapsRoad",
            opacity: 0.25
          })],
          id: "bmRoad",
          title: "Road"
        });

This doesn't have any discernible effect - what am I doing wrong?

Cheers,
Steve

Re: How to set BaseMapLayer opacity?

HemingZhu — Sun, 12 Dec 2021 08:22:19 GMT

The reference for BasemapLayer says that it includes an opacity setting, however I'm having problems getting it to work.

Using the sample here I add a setting to specify the opacity:
function createBasemapGallery(){
        //Manually create a list of basemaps to display
        var basemaps = [];
        var basemapRoad = new esri.dijit.Basemap({
          layers: [new esri.dijit.BasemapLayer({
            type: "BingMapsRoad",
            opacity: 0.25
          })],
          id: "bmRoad",
          title: "Road"
        });
This doesn't have any discernible effect - what am I doing wrong?

Cheers,
Steve

Instead of set opacity on each basemap layer. you could try set it once:

var baselayer = map.getLayer(youbasemapid);
baselayer.setOpacity(0.25);

if you want to set up opacity differently for each individual basemap layer, you could use the above code in layer's onSelectionChange() event

Re: How to set BaseMapLayer opacity?

derekswingley1 — Thu, 28 Jul 2011 20:53:48 GMT

Steve- Thanks for bringing this up, it's a bug with the basemap gallery and bing layers. We'll fix it at 2.5. Until then, can you use the workaround suggested by Heming?

Re: How to set BaseMapLayer opacity?

StephenLead — Fri, 29 Jul 2011 00:01:36 GMT

it's a bug with the basemap gallery and bing layers

Hooray, an actual bug rather than doing something wrong!

No probs, I'll use the workaround for now. Thanks guys.

Re: How to set BaseMapLayer opacity?

derekswingley1 — Fri, 29 Jul 2011 00:49:43 GMT

Well done Steve!

Re: How to set BaseMapLayer opacity?

derekswingley1 — Fri, 23 Sep 2011 17:20:18 GMT

I know we had a workaround, but we did fix this in 2.5: http://help.arcgis.com/en/webapi/javascript/arcgis/help/jshelp/new_v25.html

Re: How to set BaseMapLayer opacity?

StephenLead — Mon, 26 Sep 2011 01:22:32 GMT

man, you are thorough. Thanks for following up on this (I'd totally forgotten)

Re: How to set BaseMapLayer opacity?

derekswingley1 — Mon, 26 Sep 2011 15:10:49 GMT

Just wanted to make sure we closed the loop on this one!