10.1 Python Add-in: Combobox arcpy.SelectLayerBy onSelChange and onFocus error

DaveCrossman1 — Wed, 19 Jun 2013 21:24:57 GMT

Hi all,

I am having a very odd issue with a 10.1 Python Add-in Combobox. The code below is taken from a much larger code set and is trying to make a selection in a layer, based on the unique value selected in the combobox. The unique values are loaded onFocus. The selection is made onSelChange. The issue involves any use of arcpy.SelectLayerByAttribute_management OR arcpy.SelectLayerByLocation_management within the onSelChange or onFocus events. When I open an mxd with existing layers, everything works great. However, as soon as I make a change to any layer in the TOC (ie turn a layer off or on), the tool fails. It fails on the SelectLayerBy consistently. It will fire the onFocus several times before failing when it attempts the SelectLayerBy. Again, if the layers exist within the mxd on load, everything works fine. It's just when a layer is added or properties changed from the TOC.

Any thoughts?
Thanks in advance

import arcpy
import pythonaddins

class cboxValue(object):
    """Implementation for temp_addin.combobox (ComboBox)"""
    def __init__(self):
        self.items = []
        self.editable = True
        self.enabled = True
        self.dropdownWidth = 'WWWWWWWWWWWWWWWWWWWWW'
        self.width = 'WWWWWWWWWWWWWWWW'
    def onSelChange(self, selection):
        mxd = arcpy.mapping.MapDocument('CURRENT')
        active_view = mxd.activeView
        df = arcpy.mapping.ListDataFrames(mxd, active_view)[0]
        lyr = arcpy.mapping.ListLayers(mxd, "Towns", df)[0]
        strValue = str(selection)
        strValue = strValue.replace("'", "''")
        strSQL = "\"OFF_NAME\" = '" + strValue + "'"
        arcpy.SelectLayerByAttribute_management(lyr, "NEW_SELECTION", strSQL)
    def onFocus(self, focused):
        if focused:
            self.items = []
            mxd = arcpy.mapping.MapDocument('CURRENT')
            active_view = mxd.activeView
            df = arcpy.mapping.ListDataFrames(mxd, active_view)[0]
            lyr = arcpy.mapping.ListLayers(mxd, "Towns", df)[0]
            valueSet = set()
            valueList = []
##            dfExtent = arcpy.Polygon(arcpy.Array([df.extent.lowerLeft, df.extent.lowerRight, df.extent.upperRight, df.extent.upperLeft]), df.spatialReference)
##            arcpy.SelectLayerByLocation_management(lyr, "INTERSECT", dfExtent)
            rows = arcpy.SearchCursor(lyr)
            for row in rows:
                value = row.getValue("OFF_NAME")
                if value not in valueSet:
                    valueSet.add(value)
            valueList = list(valueSet)
            valueList.sort()
            self.items = valueList

Re: 10.1 Python Add-in: Combobox arcpy.SelectLayerBy onSelChange and onFocus error

DaveCrossman1 — Mon, 23 Sep 2013 13:45:24 GMT

Just an update on this. I have been working with ESRI and this is now officially a bug.

NIM094840: Python Add-in Combo Boxes fail to create and populate the drop down of choices after a few uses.

topic 10.1 Python Add-in: Combobox arcpy.SelectLayerBy onSelChange and onFocus error in Python Questions

10.1 Python Add-in: Combobox arcpy.SelectLayerBy onSelChange and onFocus error

Re: 10.1 Python Add-in: Combobox arcpy.SelectLayerBy onSelChange and onFocus error