I'm building a python toolbox that has 6 parameters. The toolbox is either creating a row in an underlying table, or updating a row if one already exists for the value in parameter 2. I have figured out how to automatically load values from the underlying table for parameters 3-6 when a value is selected in parameter 2. What I can't figure out how to do, is to update parameters 3-6 if the user selects a different value in parameter 2 (since the altered property is read-only so I can't reset it). Is this possible?
Here is the updateParameters section of my code:
def updateParameters(self, parameters):
"""Modify the values and properties of parameters before internal
validation is performed. This method is called whenever a parameter
has been changed."""
if parameters[0].value:
UPGDB = parameters[0].valueAsText
picklepath = "\\".join([UPGDB,"UPConfig.p"])
UPConfig = uiut.LoadPickle(picklepath)
parameters[1].filter.list = [ts[0] for ts in UPConfig['TimeSteps']]
if parameters[1].altered:
#the user selected a timestep...see if that timestep already has demographics
#if so, populate the other parameters with the values in the upd_demographics table
UPGDB = parameters[0].valueAsText
dpicklepath = "\\".join([UPGDB,"UPDemand.p"])
UPDemand = uiut.LoadDemandPickle(dpicklepath)
TSCode = parameters[1].valueAsText
if parameters[2].value == None:
parameters[2].value = UPDemand[TSCode]['StartPop']
if parameters[3].value == None:
parameters[3].value = UPDemand[TSCode]['EndPop']
if parameters[4].value == None:
parameters[4].value = UPDemand[TSCode]['PPHH']
if parameters[5].value == None:
parameters[5].value = UPDemand[TSCode]['EPHH']
return
