topic Re: Script Tool Multivalue Check Boxes Not Updating in Python Questions

Script Tool Multivalue Check Boxes Not Updating

EvanMyers1 — Thu, 04 Nov 2021 20:55:57 GMT

I have been trying to figure out why the Multivalue boxes in my tool don't respond with the "Select All" and "Unselect All" buttons. They also don't stay unchecked (they are default checked) when I click other buttons.

Here is my validation code (the commented out part at the bottom was my attempt but I get errors):

import arcpy import os 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 parameter has been changed.""" if self.params[1].value: if self.params[1].valueAsText.find(";") > -1: fclist = self.params[1].valueAsText.split(";") layerList = [] for each in fclist: # source = arcpy.Describe(each).catalogPath # desc = arcpy.Describe(each) # layersource = desc.catalogPath layerList.append(each) print layerList else: layerList = [] # desc = arcpy.Describe(self.params[0].value) # layersource = desc.catalogPath # layerList.append(layersource) layerList = [self.params[1].valueAsText] print layerList fieldlist = [] for each in layerList: #fieldnames = [f.name for f in arcpy.Describe(each).fields] fieldnames = arcpy.Describe(each).fields for fields in fieldnames: if fields not in fieldlist: #fieldlist.append(fields) fieldlist.append(fields.baseName.upper()) self.params[2].value = fieldlist print fieldlist # if self.params[1].hasBeenValidated: # for checked in self.params[2].valueAsText.split(';'): # if checked not in self.params[2].filter.list: # self.params[2].value = self.params[2].filter.list[2] return def updateMessages(self): """Modify the messages created by internal validation for each tool parameter. This method is called after internal validation.""" return

Any help would be appreciated. Thank you!

Re: Script Tool Multivalue Check Boxes Not Updating

Anonymous User — Thu, 04 Nov 2021 16:24:59 GMT

I think that this

if fields not in fieldlist:

is checking if the field object is in the fieldlist but it should be checking fields.name.upper() in fieldlist since you are appending the field's basename's to the list.

Re: Script Tool Multivalue Check Boxes Not Updating

EvanMyers1 — Thu, 04 Nov 2021 20:52:51 GMT

I tried your suggestion but it caused my field pick list to be blank. I have added a picture of my tool to better illustrate

Re: Script Tool Multivalue Check Boxes Not Updating

Anonymous User — Thu, 04 Nov 2021 23:03:16 GMT

I think .value allows for objects, so its parsing the field name from the field object in your multivalue there. Have you tried setting the filter list to the param filter, instead of the value? You may need to apply my previous suggestion of field names.

fcFilter = self.params[2].filter fcFilter.list = filterlist

Re: Script Tool Multivalue Check Boxes Not Updating

EvanMyers1 — Fri, 05 Nov 2021 20:18:20 GMT

Can you clarify which line this change should go? I tried it on line 47 and my field list doesn't populate.

Re: Script Tool Multivalue Check Boxes Not Updating

EvanMyers1 — Fri, 12 Nov 2021 20:07:49 GMT

Has anyone else figured out how this function works? This is still an issue for me.

Re: Script Tool Multivalue Check Boxes Not Updating

Anonymous User — Fri, 12 Nov 2021 20:34:26 GMT

This block of code lets me choose multiple items/ select all and deselect all works. in my 3rd parameter:

def updateParameters(self): if self.params[2].value: fcFilter = self.params[3].filter iniPath = r"{}".format(self.params[2].valueAsText) attributevalues = list(set([line.strip().split('.')[1] for line in open(iniPath)])) attributevalues.sort() fcFilter.list = attributevalues

line 47 in your code would be replaced, did you also try with a list of fieldnames instead of a list of field objects?

Re: Script Tool Multivalue Check Boxes Not Updating

Anonymous User — Fri, 12 Nov 2021 20:36:47 GMT

Another thing you can try to do is work backwards because its hard to debug this class. Create a hard coded list and get that to display/ work correctly and then manipulate your incoming data to be structured exactly like the pseudo list.

Re: Script Tool Multivalue Check Boxes Not Updating

EvanMyers1 — Tue, 23 Nov 2021 21:15:24 GMT

Thank you for providing a piece of your code, but this did not work for me.

I need to use feature layers inside arcmap for my tool to work properly. I cannot use a file path. There are only two issues that prevent my script from working and it comes down to the Validator.

1. If the layers are in a group it will not work at all. E.g. "IOError: "'New Group Layer\wControlValve'" does not exist". On line 42, arcpy.Describe(each).fields, isn't working.

2. If I ungroup my layers, the field list populates, but now none of the boxes will stay unchecked, making my tool useless.

Right now, the way I have my code works to an extent, it is my lack of understanding why the boxes wont stay unchecked.