Selecting a value from the Python toolbox drop-down list of an ArcPy script in ArcGIS Pro

Question

I created a script. I would like the user to be able to select a value from the drop-down list. Once the value is selected, I would like this value to be displayed on my cover page that I created. However, when I execute the code, instead of a single value that is displayed, all the values in the drop-down list are displayed as the title of the cover page. Here is so attached my code and the result that the performance produces.

class ToolValidator:
 # Class to add custom behavior and properties to the tool and tool parameters.
 def __init__(self):
 # set self.params for use in other function
 import arcpy, os
 
 self.params = arcpy.GetParameterInfo()
 
 def initializeParameters(self):
 # Customize parameter properties. 
 # This gets called when the tool is opened. 
 return
 
 
 def updateParameters(self):
 # Modify parameter values and properties.
 # This gets called each time a parameter is modified, before 
 # standard validation.
 aprx = arcpy.mp.ArcGISProject("CURRENT") 
 map1 = aprx.listMaps("Map1")[0]
 cov = aprx.listLayouts("Mapbook_global")[0]
 lyr_planches = map1.listLayers("assemblage_carro_11000_5000")[0]
 ## titre 
 TheRows = arcpy.SearchCursor(lyr_planches) 
 liste = []
 for TheRow in TheRows: 
 liste.append(TheRow.cis) 
 TheName = list(set(liste)) 
 title = TheName
 titleTxt =cov.listElements("TEXT_ELEMENT","title")[0]
 titleTxt.text = title
 
 self.params[0].value = lyr_planches
 self.params[1].filter.list = TheName
 
 return

• Vince: The first rule of ArcPy cursors is "Don't use arcpy.SearchCursor" (Use arcpy.da.SearchCursor instead). Python best practice is to use lower_case variable names and UpperCase class names. Your code goes out of its way to make a list then a set the a list again, and calls that (eventually) title, so it shouldn't be a surprise that all the values are present. You haven't included the code where the value is used.

Answer 1

You're setting the titleTxt to title which is a list which make all the values in the drop-down list to be displayed

TheName = list(set(liste)) 
title = TheName

Instead, move that part to the main script body

def execute(self, parameters, messages):
 title = parameters[1].valueAsText
 
 aprx = arcpy.mp.ArcGISProject("CURRENT") 
 map1 = aprx.listMaps("Map1")[0]
 cov = aprx.listLayouts("Mapbook_global")[0]
 
 titleTxt =cov.listElements("TEXT_ELEMENT","title")[0]
 titleTxt.text = title

• Raphael05: Merci pour votre retour. J'ai repris et ça marche.
• Ahmad Raji: If it works, mark it as the correct answer.