select rgb channel check if selection is empty

[shadowpower]

Hello, I have a script I made with javascript some years ago which does multiple things, among other things it runs an action for each layer following a naming pattern.

These layers are black and white images used for making masks, the action does the following things:

* hides all other layers

* selects rgb channel

* deletes the layer

* shows all other layers

* creates a solid color

* adds various options like unlinking the layer mask, linear burn mode, slot color : blue

I want to know if there is a way to know if the selection is empty (so that I can just skip creating and tweaking the solid color layer), also if there is a faster way to select the white part of a layer without doing the layer toggle thing.

I never tried if try and catch works with the command to select (ctrl+click) rgb channel because I don't know what it's named.

[Kukurykus · Accepted solution]

sTT = stringIDToTypeID
dsc2 = new ActionDescriptor();
(dsc1 = new ActionDescriptor())
.putInteger(sTT('fuzziness'), 0);
mm = ['min', 'max']; while(mm.length)
	dsc2.putDouble(sTT('luminance'), 100),
	dsc2.putDouble(sTT('a'), 0), dsc2.putDouble(sTT('b'), 0),
	dsc1.putObject(sTT(mm.shift() + 'imum'), sTT('labColor'), dsc2)
executeAction(sTT('colorRange'), dsc1);

((ref = new ActionReference()).putProperty(sTT('property'), sTT('selection')),
ref.putEnumerated(sTT('document'), sTT('ordinal'), sTT('targetEnum')),
executeActionGet(ref).hasKey(sTT('selection'))) && 'rest of script'

[shadowpower]

Oh, that's perfect, I've a question though. how do I save the boolean into a variable or something so that I can use it on an if then else format, something like this.

selbool = 
if (selbool == true)
{

}
else
{

}

[shadowpower]

nevermind, I got it. I added some extra parenthesis before so I couldn't get it to work.

sTT = stringIDToTypeID
dsc2 = new ActionDescriptor();
(dsc1 = new ActionDescriptor())
.putInteger(sTT('fuzziness'), 0);
mm = ['min', 'max']; while(mm.length)
	dsc2.putDouble(sTT('luminance'), 100),
	dsc2.putDouble(sTT('a'), 0), dsc2.putDouble(sTT('b'), 0),
	dsc1.putObject(sTT(mm.shift() + 'imum'), sTT('labColor'), dsc2)
executeAction(sTT('colorRange'), dsc1);

if (((ref = new ActionReference()).putProperty(sTT('property'), sTT('selection')),
ref.putEnumerated(sTT('document'), sTT('ordinal'), sTT('targetEnum')),
executeActionGet(ref).hasKey(sTT('selection'))) == true)
{
	alert("True")
}
else
{
	alert("False")
}

[Kukurykus]

The last part start from if statement, while "&& 'rest of script'" part change to {/*your code*/}.