Stop a script if no active layer is found

[defaultseiiesa394z4]

I am trying to stop a script if no layer is selected.
I am finding it wierd why this command returns the first layer even if nothing is selected

alert (app.activeDocument.activeLayer.name);

I tried doing try catch instead of throwing an error when no layer is selected. But that also didn't work

Folks, I am new here. Please guide to help me understand better

[jazz-y]

s2t = stringIDToTypeID;
(r = new ActionReference()).putProperty(s2t('property'), p = s2t('targetLayers'));
r.putEnumerated(s2t("document"), s2t("ordinal"), s2t("targetEnum"));
if (!executeActionGet(r).getList(p).count) alert('no layers selected')

[Stephen_A_Marsh]

@defaultseiiesa394z4 – It's a well-known bug when using DOM code, as the excellent script from @jazz-y shows, it takes the more esoteric AM code to overcome the issue.

[Chuck Uebele]

So since you asked about stopping the script. You can use jazz-y's script. Create a variable called run and set it to true. Create an if statement for all your routine code and have the condition be the run variable.  Then in jazz-y's script, change the run variable to false, if no layer is select. Tje script will then bypass all your code in the if statement and end.

[Stephen_A_Marsh]

@Chuck Uebele  - A good point!

One could also use .confirm() if user action is required.

[chrisg11235813]

this might help you:

https://community.adobe.com/t5/photoshop-ecosystem-discussions/get-selected-layers/m-p/3332778

[Stephen_A_Marsh]

@defaultseiiesa394z4 - So how did you go with the code and suggestions?