List/table input widget

Problem

We need to take some complex data or configuration from the user in a GUI way.

But streamlit currently allows the following types of input:

• text
• text area
• number
• slider (number)
• slider selection (str)
• checkbox (bool)
• multiselect
• radio

(am I missing something ?)

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• Streamlit does not have a list input. Something where users can click a small + icon and add any number (min and max may be defined) of items to a list. Each item on the list may be a text or number.

• Streamlit does not have a dict input, where the user can give some key-value pairs, and add items to the dict.

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this image gives the flavor of what I am trying to say.

you see the + icon and the delete icon. they should allow an arbitrary no of items in a list or dict.

Solution

It would be great if we could input more complex custom types in streamlit. (beyond list and dict as said above)

For example, we may define a pydantic base model, and streamlit would input that.

from typing import List

from pydantic import BaseModel
import streamlit as st

class MyCustomData(BaseModel):
    name: str
    age: int
    friends: List[int]

st.get_input(MyCustomData) # imaginary

Some code like shown above should generate a form to input the data of the structure defined.

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[gagan3012]

Hi, Streamlit does have a way to add lists its called streamlit-tags Check it out here: https://github.com/gagan3012/streamlit-tags

[FHU-yezi]

That is really a good idea! It will make the speed of develop an App faster, because it provided some methods that used widely in it. That is the value of Streamlit.

By the way, it is easily to make the method come true. Just create a “widget” with some methods which Streamlit had yet. The only problem of it is change the style of buttons.