topic Re: How do List and get field values of Currently Selected Features in a layer in Python Questions

How do List and get field values of Currently Selected Features in a layer

ShaneLim — Thu, 24 Oct 2013 20:34:41 GMT

I have an add in that selects all the points of a specific layer within the currently zoomed in extents on a button click event. Now I need to populate a combo box with the label field of all these features. Does anybody know of a way to do this? The search cursor wants the dataset which will not get just the currently selected.

Thanks for your time.

Shane

def onClick(self):         self.mxd = arcpy.mapping.MapDocument('current')         layers = arcpy.mapping.ListLayers(self.mxd)         self.items = []         for layer in layers:             if layer.name.lower() == "hydrantm":                 hydLayer = layer         print hydLayer         df = arcpy.mapping.ListDataFrames(self.mxd)[0]         extent = str(df.extent)         print extent         dfAsFeature = arcpy.Polygon(arcpy.Array([df.extent.lowerLeft, df.extent.lowerRight, df.extent.upperRight, df.extent.upperLeft]),                             df.spatialReference)         arcpy.SelectLayerByLocation_management(hydLayer, "INTERSECT", dfAsFeature, "", "NEW_SELECTION")

Re: How do List and get field values of Currently Selected Features in a layer

JakeSkinner — Fri, 25 Oct 2013 10:03:28 GMT

Hi Shane,

The SearchCursor will work on the selection created from the Select by Location. Try the following:

def onClick(self):         self.mxd = arcpy.mapping.MapDocument('current')         layers = arcpy.mapping.ListLayers(self.mxd)         self.items = []         for layer in layers:             if layer.name.lower() == "parks":                 hydLayer = layer         print hydLayer         df = arcpy.mapping.ListDataFrames(self.mxd)[0]         extent = str(df.extent)         print extent         dfAsFeature = arcpy.Polygon(arcpy.Array([df.extent.lowerLeft, df.extent.lowerRight, df.extent.upperRight, df.extent.upperLeft]),                             df.spatialReference)         arcpy.SelectLayerByLocation_management(hydLayer, "INTERSECT", dfAsFeature, "", "NEW_SELECTION")         global labels         labels = []         with arcpy.da.SearchCursor(hydLayer, ["NAME"]) as cursor:             for row in cursor:                 labels.append(row[0])         del cursor, row

You will need to change "NAME" to the label field. Then, you can then pass the global labels variable to the 'onFocus' function of the combo box:

def onFocus(self, focused):         self.items = labels

Note: the arcpy.da.SearchCursor can only be used for 10.1 and beyond. If you are using 10.0 you will need to use:

rows = arcpy.SearchCursor(hydLayer, "", "", "NAME") for row in rows:     labels.append(row.NAME) del row, rows

Re: How do List and get field values of Currently Selected Features in a layer

ShaneLim — Fri, 25 Oct 2013 17:17:01 GMT

Thanks worked great. A little slow but gets the job done.

Shane