property frameX

This property returns the x (horizontal) position of this box relative to its parent frame.

function ShowOffsets()
{
    var bx = scene.getBoxById("myBox");
    if (bx)
    {
        shell.print("Frame X Offset: " + bx.frameX);
        shell.print("Frame Y Offset: " + bx.frameY);
        shell.print("Screen X Offset: " + bx.screenX);
        shell.print("Screen Y Offset: " + bx.screenY);
    }
}