Add a line item or row

Using Streamlit
4

I have a related example here. (Instead of a button to add one, it uses a slider to set the number of rows but the Streamlit mechanics are the same.) The example has the forth column being computed from other columns as an additional feature.

https://mathcatsand-examples.streamlit.app/add_data

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image810×744 18.8 KB 

import streamlit as st

st.write('# Solution using input widgets')

# a selection for the user to specify the number of rows
num_rows = st.slider('Number of rows', min_value=1, max_value=10)

# columns to lay out the inputs
grid = st.columns(4)

# Function to create a row of widgets (with row number input to assure unique keys)
def add_row(row):
    with grid[0]:
        st.text_input('col1', key=f'input_col1{row}')
    with grid[1]:
        st.number_input('col2', step=1, key=f'input_col2{row}')
    with grid[2]:
        st.number_input('col3', step=1, key=f'input_col3{row}')
    with grid[3]:
        st.number_input('col4', step=1, key=f'input_col4{row}',
                        value = st.session_state[f'input_col2{row}'] \
                            -st.session_state[f'input_col3{row}'],
                        disabled=True)

# Loop to create rows of input widgets
for r in range(num_rows):
    add_row(r)
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