I am trying to script some behavior into the ArcGIS Toolbox validator class. Specifically, I am creating a dropdown parameter so the user can choose a predefined option and then a second parameter will update a list of items. The issue I am having is, when I change the option in the first parameter, I can get the options to change in the second parameter, but when I toggle the 'Unselect All' button in the second parameter, the items will not uncheck (they remained checked). I have a feeling it has to do with my script in the Validator.
Here are the details (see image below as well):
- First parameter is a string type. It is required, Input Direction, Has a default value. Multivalue = No and uses a value list so that I can have a dropdown with 3 options to choose from
- Second parameter is a string type. It is required. Contains Default values. Multivalue = Yes and uses a value list so that the items populated in this parameter (a list of items) can be toggled on or off.
So, in the Validator, my script is as follows. Can anyone see something obvious I ma misisng here to get the 'Select All' and 'Unselect All' buttons to work?
import arcpy
class ToolValidator(object):
"""Class for validating a tool's parameter values and controlling
the behavior of the tool's dialog."""
def __init__(self):
"""Setup arcpy and the list of tool parameters."""
self.params = arcpy.GetParameterInfo()
def initializeParameters(self):
"""Refine the properties of a tool's parameters. This method is
called when the tool is opened."""
self.params[1].filter.list = [1,2,3,4]
self.params[1].values = self.params[1].filter.list
return
def updateParameters(self):
"""Modify the values and properties of parameters before internal
validation is performed. This method is called whenever a parameter
has been changed."""
if self.params[0].altered == True:
if self.params[0].value == 'Option 1':
self.params[1].filter.list = [1,2,3,4]
self.params[1].values = self.params[1].filter.list
elif self.params[0].value == 'Option 2':
self.params[1].filter.list = ['a', 'b', 'c']
self.params[1].values = self.params[1].filter.list
elif self.params[0].value == 'Option 3':
self.params[1].filter.list = ['dr', 'bht', 'cjjjyy']
self.params[1].values = self.params[1].filter.list
return
def updateMessages(self):
"""Modify the messages created by internal validation for each tool
parameter. This method is called after internal validation."""
return
