Select all objects on same layer for nested layers

oh I see, thanks for pointing that out Kurt, I thought the OP was using a javascript function instead of a menu command.

there is a javascript equivalent that selects all on the same layer, but as mentioned it does select all items in layers and sublayers

app.executeMenuCommand("Selection Hat 3");

Sorry, Carlos. I was answering in the wrong thread.

Your script does work, of course.

I don't think that this will work, Carlos.

The command that default is referring to is the Select menu > Object > All on the same Layers.

It does not respect sublayers.

The select all objects on same layer function selects all objects on nested layers,

can you post the function you're using? I don't remember seing a selectAllObjectsOnSameLayer() function.

this works the the way you want if you have an object already selected

activeDocument.activeLayer.hasSelectedArtwork = true;

It's not a script, but this simple action will also do what you are looking for.

https://drive.google.com/file/d/1iboxQmQqY5dSgXZoWyJxd8Hnf-9XFlht/view?usp=sharing

Note that it may not work in older versions of Illustrator.

This'll work. It's not very robust.. You'll likely need some logic to actually determine the correct layer, because i'm sure you don't want to be manually renaming the desired sublayer to "Sublayer To Select" every time.. Assuming the layers aren't name, but you know where they are in the stacking order, can select the layers by index instead, like this: 

layers[0].layers[1].hasSelectedArtwork = true;

function selectSubLayer()
{
	var doc = app.activeDocument;
	var layers = doc.layers;

	var layerToSelect = layers["Layer 1"].layers["Sublayer To Select"];
	layerToSelect.hasSelectedArtwork = true;
}
selectSubLayer();

var doc = app.activeDocument;
var sel = app.selection;
for (var i = 0; i < doc.pageItems.length; i++) {
    if (doc.pageItems[i].layer == sel[0].layer) {
        doc.pageItems[i].selected = true;
  }
}