In Chapter 4 we used get_selected_marks to get the user's selection from the Tableau Dashboard. In this chapter, we'll save the key fields we need to allow users to make a comment.
We want to get the name of the state and the profit from the dashboard, which are both contained in user_selection. Let's add some code to our form that saves this information to form attributes:
from ._anvil_designer import Form1Template
from anvil import *
from anvil import tableau
from trexjacket.api import get_dashboard
dashboard = get_dashboard()
class Form1(Form1Template):
def __init__(self, **properties):
self.state_name = None
self.profit = None
self.logged_in_user = None
self.init_components(**properties)
dashboard.register_event_handler('selection_changed', self.selection_changed_event_handler)
def selection_changed_event_handler(self, event):
user_selection = event.worksheet.get_selected_marks()
if len(user_selection) == 0:
self.state_name = None
self.profit = None
self.logged_in_user = None
else:
record = user_selection[0]
self.state_name = record['State']
self.profit = record['AGG(Profit Ratio)']
self.logged_in_user = record['logged_in_user']
msg = f"User: {self.logged_in_user}\nState: {self.state_name}\nProfit Ratio: {self.profit}"
Notification(msg).show()Once you've added this code in the code pane of Form1, reload the extension inside Tableau and click on a few states. You should see the selection appearing as a popup in your extension!
In the next chapter we'll add the functionality for a user to add their comment.