topic Re: Setting transparency on sublayers of an ArcGISDynamicMapServiceLayer? in ArcGIS API for Flex Questions

Setting transparency on sublayers of an ArcGISDynamicMapServiceLayer?

Luiza_Helenada_Silva — Tue, 27 Mar 2012 13:02:06 GMT

I am working on a Flex component to allow users to change a layer's transparency. This component gets what layer to use from another component that is a TOC. I want to be able to change the transparency of a sublayer in an ArcGISDynamicMapServiceLayer, but I see that the item type I get is LayerInfo (no alpha...).

Is this possible at all, or can I only change transparency on the entire map service layer (thus affecting all the sublayers)?

Any insight would be appreciated!

(Note: I am using Flex API 2.4).

Thanks,
-Luiza

Re: Setting transparency on sublayers of an ArcGISDynamicMapServiceLayer?

FaizanTayyab — Wed, 28 Mar 2012 09:48:06 GMT

I think at the moment it only works with the map service itself and not the sublayers.

Re: Setting transparency on sublayers of an ArcGISDynamicMapServiceLayer?

IvanBespalov — Wed, 28 Mar 2012 10:29:39 GMT

ihdasilva,

no, it is not possible. (The only way, if you initialize each sub layer as ArcGISDynamicMapServiceLayer :rolleyes: )

Here is important to understand how is it works.

1 - ArcGISDynamicMapServiceLayer is container for IMAGE exported from server,
parameters you set for ArcGISDynamicMapServiceLayer are IMAGE export parameters.
Not 55 images for 55 sublayers, but 1 image exported form server for 55 sublayers.

2 - Flex Map is container for all layers:
static layer (navigation, scalebar, copyright, logo ...),
map layers (each 1 is something like flex display object / container ))
The transparency you set for ArcGISDynamicMapServiceLayer is alpha parameter for flex component (for IMAGE - 1 image for 55 sublayers)

Right?

Look at this discussion. May be you do not need to change transparency in flex code, but you set layers transparency in mxd file.

Re: Setting transparency on sublayers of an ArcGISDynamicMapServiceLayer?

DasaPaddock — Thu, 29 Mar 2012 20:24:03 GMT

You can control the transparency of the sublayers if you're using ArcGIS 10.1 and the 3.0 API.

See:
http://resourcesbeta.arcgis.com/en/help/flex-api/apiref/com/esri/ags/layers/supportClasses/LayerDrawingOptions.html#alpha

Re: Setting transparency on sublayers of an ArcGISDynamicMapServiceLayer?

YungKaiChin — Thu, 12 Apr 2012 19:23:11 GMT

One opinion (if there really is not other way) is to romove the sublayer from the mapservicelayer in code and to bring in the same mapservicelayer again with only the sublayer.

Re: Setting transparency on sublayers of an ArcGISDynamicMapServiceLayer?

AaronBarkhurst — Fri, 01 Nov 2013 13:35:44 GMT

So does the same hold true for the ability to move the sublayers (children) up and down in the TOC and map drawing order? I have set the ability to drag and drop layers in the TOC, the UI allows the ability to move the sublayers, but the map/toc reorder only applies to the parent layers. Is there a way to allow users to reorder the sublayers both in the TOC and map drawing/layering?

Re: Setting transparency on sublayers of an ArcGISDynamicMapServiceLayer?

SmithaNivesh — Thu, 08 Oct 2015 02:38:08 GMT

Is it possible to do the same in Javascript API v31.4 arcgis 10.3 version?

Re: Setting transparency on sublayers of an ArcGISDynamicMapServiceLayer?

RobertScheitlin__GISP — Sat, 17 Oct 2015 12:37:39 GMT

Smitha,

Questions like this should be posted to the JS API space. Here are some similar threads in the JS API Space:

Change Transparency of Layer in MapService

setLayerDrawingOptions is not changing transparency setting