I have a script tool that takes four inputs. 1. a feature class2. a field - obtained from feature class3. an address - string - A drop down from this parameter is based on information in the selected field above. 4. output fileI've updated the validation code so that the values in the selected field (#2) become the choise list for #3. I've used this script several times before with no problem, but now it doesn't perform correctly.Am I over looking something?Validation Code:
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."""
return
def updateParameters(self):
"""Modify the values and properties of parameters before internal
validation is performed. This method is called whenever a parmater
has been changed."""
if self.params[1].altered:
fc = str(self.params[0].value)
fieldname = str(self.params[1].value)
sc = arcpy.SearchCursor(fc)
valueList = []
for row in sc:
valueList.append(row.getValue(fieldname))
valueList.sort()
self.params[3].filter.list = valueList
return
def updateMessages(self):
"""Modify the messages created by internal validation for each tool
parameter. This method is called after internal validation."""
return
Screenshot of parameters:[ATTACH=CONFIG]29308[/ATTACH]
