I am building an ArcGIS gui that takes 4 parameters:
The tool will clip data from any of the layers choosen in Parameter #3 based on the input feature class or shapefile (clip feature) from Parameter #1
If the user chooses a feature class as an input, it is know that there are only 2 to choose from ("AREA1", "AREA2"). They will use Parameter 2 to Query a record from which ever feature class they choose. (eg "SITE_NUMBER" = 10023) Also, I know that these 2 feature classes contain the same list of fields, so I can code this into the underlying python script to write the names of particular ones I want to the resultant excel spreasheet.
If the user chooses a shapefile, it could be one of several hundred. Each shapefile only has one record (polygon) so I do not need them to query on a feature using an SQL Query. However, each shapefile does not have the same list of fields from one to the next. In this case, instead of having Parameter #2 of datatype "SQL Expression", I would like to dynamically change the datatype, using the updateParameter function in the Validator Class, to string and a multivalue filter of field names from the shapefile to which the user can choose from.
In the following script, I have attempted to set the some default values for Parameters #1 and 2. dayatype on Parameter #2 if the user changes the input value for Parameter #1. For the programmers out there, this obviously doesn't work as it is a read only parameter according to the help docs:
http://resources.arcgis.com/en/help/...0000000v000000
There seems to be a way to set the parameter datatype on the Parameter object, but I'm not sure how to pass that from getParameterInfo function into the updateParameter function:
http://resources.arcgis.com/en/help/...00000035000000
I've been playing around with a bunch of approaches, but none seem to work. So, for what I tried to outline as my outcome above....is what I am trying to do possible?
- An input feature class or shapefile
- A parameter to query on the input feature class or shapefile
- A predefinied multivalue list of layer names that the user can choose from
- An output folder location to print out an excel file
The tool will clip data from any of the layers choosen in Parameter #3 based on the input feature class or shapefile (clip feature) from Parameter #1
If the user chooses a feature class as an input, it is know that there are only 2 to choose from ("AREA1", "AREA2"). They will use Parameter 2 to Query a record from which ever feature class they choose. (eg "SITE_NUMBER" = 10023) Also, I know that these 2 feature classes contain the same list of fields, so I can code this into the underlying python script to write the names of particular ones I want to the resultant excel spreasheet.
If the user chooses a shapefile, it could be one of several hundred. Each shapefile only has one record (polygon) so I do not need them to query on a feature using an SQL Query. However, each shapefile does not have the same list of fields from one to the next. In this case, instead of having Parameter #2 of datatype "SQL Expression", I would like to dynamically change the datatype, using the updateParameter function in the Validator Class, to string and a multivalue filter of field names from the shapefile to which the user can choose from.
In the following script, I have attempted to set the some default values for Parameters #1 and 2. dayatype on Parameter #2 if the user changes the input value for Parameter #1. For the programmers out there, this obviously doesn't work as it is a read only parameter according to the help docs:
http://resources.arcgis.com/en/help/...0000000v000000
Code:
# Set Parameters #1nad 2 default values
if not self.params[0].altered:
self.params[0].value = r"Database Connections\CONNECT1.sde\AREA1_SPATIAL.ER_SVW"
if not self.params[1].altered:
self.params[1].datatype = "SQL Expression"
self.params[1].value = ""
# if the user changes Parameter #1, then update the datatype and values
if self.params[0].value == r"Database Connections\CONNECT1.sde\AREA1_SPATIAL.ER_SVW":
self.params[1].datatype = "SQL Expression"
self.params[1].value = "SITE_NUMBER = "
elif self.params[0].value == r"Database Connections\CONNECT1.sde\AREA2_SPATIAL.ER_SVW":
self.params[1].datatype = "SQL Expression"
self.params[1].filter.list = "SITE_NUMBER = "
elif self.params[0].value not in [r"Database Connections\CONNECT1.sde\AREA1_SPATIAL.ER_SVW", r"Database Connections\CONNECT1.sde\AREA2_SPATIAL.ER_SVW"]:
self.params[1].datatype = "String"
descFields = arcpy.Describe(self.params[0].value).fields
self.params[1].filter.list = [field.name for field in descFields]
self.params[1].filter.values = self.params[1].filter.listhttp://resources.arcgis.com/en/help/...00000035000000
I've been playing around with a bunch of approaches, but none seem to work. So, for what I tried to outline as my outcome above....is what I am trying to do possible?