AutoCAD 2008 introduced layer notification. AutoCAD alerts you to any new layers in the drawing at specified times—for example, before you plot, save, or restore a layer state. The first time you save or plot a drawing, AutoCAD creates a layer list of all the layers in that drawing. From that point on, any layers added to the drawing are regarded as unreconciled.
The LAYEREVAL and LAYERNOTIFY system variables combine to determine whether the layer list is evaluated and whether you are notified of any new layers. Both of these variables are saved in the drawing, so you can customize the settings for each drawing.
The default setting for LAYEREVAL is 1 (one) to detect any new layers that have been added to attached xrefs only, not to the drawing. Change the setting to 2 to have AutoCAD evaluate all new layers added to the drawing. A setting of 0 turns layer evaluation off.
LAYERNOTIFY’s settings are:
4 Load/Reload/Attach xrefs
8 Restore layer state
You can add values together to provide notification at multiple times.
Note that if you specify the Open command for notification and you open multiple drawings at the same time, AutoCAD displays an alert for each drawing that contains new layers.
To change these settings, select Settings in the bottom left corner of the Layer Properties Manager to bring up the New Layer Notification Settings dialog box. Or type the variable name at the command prompt, then enter the appropriate number to change the setting.
Caption: Layer Notification options.
When layer evaluation is enabled and AutoCAD detects a new layer, the Unreconciled New Layers icon displays on the status bar at the bottom right of the drawing window. Right-click the icon, then select View Unreconciled New Layers from the shortcut menu that appears to view the new layers.
Caption: Right-click on the Unreconciled New Layers icon in the status bar to view the shortcut menu.
If you’ve selected the Notify when new layers are present option, a warning bubble also displays next to the Unreconciled New Layers icon.
Caption: Layer notification warning bubble.
If you request notification before plotting, AutoCAD displays a warning dialog box instead of the usual bubble. Select Yes to view the new layer list in the Layer Properties Manager before plotting.
Caption: Layer Notification Warning appears when you try to plot unreconciled layers.
When you select an option to view unreconciled new layers, AutoCAD launches the Layer Properties Manager with the Unreconciled New Layers filter selected automatically. All new layers that have been added to the drawing or attached xrefs appear in the list view.
The next step is to reconcile the new layers, which removes them from the Unreconciled New Layers list. Simply select an unreconciled layer, right-click, and choose reconcile layer. Those layers are then included in the layer list and will no longer trigger the layer notification.
Caption: You can select multiple layers to reconcile at once.
If you don’t reconcile the new layers, the notification bubble will appear each time you invoke a command that triggers notification.