In python toolbox, can you have parameters update more than once?

RyanBoynton — Thu, 01 Oct 2015 19:11:17 GMT

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

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In python toolbox, can you have parameters update more than once?