[mapguide-users] hide layer on box checked

[dorra2007]

Hi all;
I have read several posts about the setvisible function, but I have still
errors in my code  (I am using javascript/jsp).

Can someone give me a comprhensive code in javascript, wich show how i can
use the SetVisible method?
PS: My featuresource is a postgis database.

here is the code i used:

map=new MgMap();
map.open(resourceService,map_name);
layer=map.GetLayers().GetItem(layer_name);
layer.SetVisible(true);
map.save(resourceService);

the resourceService is not defined. In fact, what does it refers to?And how
can I define it?Should I create a map object?..

Many question, can someone help me?

Thank you in advance.
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