Selecting Dropdown Value In Tuple

Anvil Q&A
1

I have a tuple as a value in a drop down. So, items looks like this :

[
  ("Hello", (5,"Hello"))
]

I want to programmatically set the selected value (as a default) like this :

self.dropdown.selected_value = 5

but that doesn’t work. I need the value to be a tuple as I need access to the drop down text of the selection.

Is it possible?

2

This would do it:

self.dropdown.selected_value = (5,"Hello")

(Or a for loop to go through self.dropdown.items and find the right one.)

That said, if I found myself doing this I might try to organise things differently. What are you trying to do?

3

One of the items will have an ID of zero, and I always want that one to be the default selected value when the form loads. Unfortunately I won’t know what the text is in advance.

4

I may not be seeing the issue clearly, but if I use lists I can change the value as expected.

    self.drop_down_1.items=[["Hello", [5,"Hello"]]]
    self.drop_down_1.selected_value[0]=10
    print(self.drop_down_1.selected_value[0])

#returns 10
5

Here’s what I would do:

for name, (number,_) in self.dropdown.items:
  if number == 0:
    self.dropdown.selected_value = (number,name)
2 Likes
6

That’s the missing link for me :slight_smile:

Ta muchly.

Oh, and I agree I might need to structure some of this, I just need to get something out of the door today and that was the only thing holding me back…