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arcpy function to test for selected features

JoshuaJohnson1

Hello!

I am searching for a function that would return a Boolean value if there are selected features in an mxd.

I know you can use arcpy.SelectLayerByAttribute_management(Layer, "CLEAR_SELECTION") to clear selections for a layer but I don't want to clear just test. The maps were exported to pdf and may have the selected features showing on the pdf docs. I need a function to test which mxd's have selected features and I've got about 1600 maps.

Any help would be appreciated.

Thanks!
Josh

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ChrisSnyder

Okay your right... a better way:

selectedCount = len([int(fid) for fid in arcpy.Describe(layerName).fidset.split(";") if fid != ''])

ChrisSnyder

How about something like:

Traffic_Islands = "Island+Kerb Topology\\Traffic_Islands"
Kerb_Channel = "Island+Kerb Topology\\Kerb_Channel"
class ButtonClass1(object):
   """Implementation for SetKerbType_addin.button (Button)"""
   def __init__(self):
   self.enabled = True
   self.checked = False
   def onClick(self):
      if len(arcpy.Describe(Traffic_Islands).fidset.split(";")) > 0:
         arcpy.CalculateField_management(Traffic_Islands, "KERB_TYPE", "\"SM3\"", "VB", "")
      else:
         #tell the user they are doing something wrong
      if len(arcpy.Describe(Kerb_Channel).fidset.split(";")) > 0:
         arcpy.CalculateField_management(Kerb_Channel, "KERBTYPE", "\"SM3\"", "VB", "")
      else:
         #tell the user they are doing something wrong

GreggPitts

Hi everyone, I've got a similar situation... I've tried the above mentioned feature selection detection scripts but they do not work on my ArcMap 10.2. Or maybe I'm not puting them in right?

I've got a button that when pressed performs two field calculations - one on a polygon layer then another on a arc layer.
However I want to put in a failsafe so it will not do anything if nothing is selected since this morning I accidentally had a polygon selected and there was no arc selected so it field calc'ed the entire Kerb_Channel arc feature class with one value!!!
Basically they're polygon traffic islands with arc kerb lines around them, however the prefab traffic islands must not have a kerb line because there is no seperate kerb. I've used the ArcGIS AddIn Assistant to make the button with this Arcpy script which I copied and pasted from an exported to Python Model Builder model:

import arcpy
import pythonaddins

# Local variables:
Traffic_Islands = "Island+Kerb Topology\\Traffic_Islands"
Kerb_Channel = "Island+Kerb Topology\\Kerb_Channel"

class ButtonClass1(object):
    """Implementation for SetKerbType_addin.button (Button)"""
    def __init__(self):
        self.enabled = True
        self.checked = False
    def onClick(self):
       # Some kind of selection detection code here for the Kerb_Channel layer since a polygon will always be selected
        arcpy.CalculateField_management(Traffic_Islands, "KERB_TYPE", "\"SM3\"", "VB", "")
        arcpy.CalculateField_management(Kerb_Channel, "KERBTYPE", "\"SM3\"", "VB", "")

Also, is there a PDF or site somewhere that has the Arcpy procedures and functions and what they do etc like there is for normal Python? I've googled it and I can't find anything with a list of Arcpy procedures/functions with what they do and how to use them. Something like SharpDev's inline help would be awesome.

Thank you,
Gregg

TedCronin

arcgisscripting.create(10.0). You can migrate when you want to, basically at 10, which is pretty cool. I have lots of pre 10 scripts in production, and just port when I have the time or need arcpy.

ChrisSnyder

Does arcgisscripting even work with v10.0?

It does if you use the default version of Python that is auto-installed with v10 (and you don't try to monkey with or upgrade it).

Although I think(?) in this case all you have to do is change "gp" to "arcpy":

selectionCount = len(arcpy.describe(lyr).fidset.split(";"))
#or
selectionCount = int(arcpy.GetCount_management(gp.describe(lyr).catalogpath).getoutput(0)) - int(arcpy.GetCount_management(lyr).getoutput(0))

JoshuaJohnson1

Thanks to you both. Does arcgisscripting even work with v10.0?

Thanks!
Josh

ChrisSnyder

Two methods I use (v9.3 code BTW, but easy to convert to arcpy):

For actual selections (must be a selection made by SelectByAttributes or SelectByLoactions and not a definition query):

selectionCount = len(gp.describe(lyr).fidset.split(";"))

But for layers that might have a differenet feature count than the actual feature class they are based off (via a definition query or some SQL used by the MakeFeatuerLayer tool):

selectionCount = int(gp.GetCount_management(gp.describe(lyr).catalogpath).getoutput(0)) - int(gp.GetCount_management(lyr).getoutput(0))

TedCronin

You could try GetCount. This was at 9.3.1 with arcgisscripting

result = gp.GetCount(ParcelInfo) #Total Anno Count
    gp.SelectLayerByAttribute_management(SpecAnno, SubSel, AC[0])
    result = gp.GetCount(ACParcelInfo)
    getSel = result.GetOutput(0)
    if getSel >= 1:
         do something
    elif getSel == 0:
        do something else

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