Layer list wouldn't update visibility when check box clicked

[DavidBoyd]

I'm very new to Javascript and making slow, steady progress.  Still figuring it out.  I got the layer list to draw in a tab to the left, but the updatelayervisibility function apparently isn't firing when I click a check box.  This could be something very simple, but I can't find it.  Thanks for any help!

[CraigMcDade]

there is a spelling error early in your code. This may or may not be the problem:

var landsResults, riversResutls;

It is spelled correctly when you reference it later in the code.

[__Rich_ · Accepted solution]

Your "vop" object isn't in scope inside your "updateLayerVisibility" function, so this will fail:

vop.setVisibleLayers(visible);

Since you've hard-coded the Id of your vop layer here:

var vop = new  esri.layers.ArcGISDynamicMapServiceLayer(     "http://dswcapps.dcr.virginia.gov/ArcGIS/rest/services/dnh/vop/MapServer",     {         id: 'vop',         opacity: 0.45     } );

....one quick way you could get a reference to the layer is to replace that broken line with:

 map.getLayer("vop").setVisibleLayers(visible);

[DavidBoyd]

Problem solved, and I learned something too.  Thanks to both of you!!!!