Fill in Input boxes based on input value in PysimpleGUI

Question

This is my code:

import PySimpleGUI as sg
import datetime
from datetime import date
import pandas as pd

columns = ["TYPE","DIRECTION","DATE","OPTION"]
param = (20,3) # size of the main window

def GUI():
    sg.theme('Dark Brown 1')
    listing = [sg.Text(u, size = param) for u in columns]
    core = [
    sg.Input(size = param),
    sg.Input(size = param),
    sg.Input(size = param),
    sg.Input(size = param)]
   
    mesh = [[x,y] for (x,y) in list(zip(listing, core))]
    layout =[[sg.Button("SEND")]]+ mesh
    window = sg.Window('Trade Entry System', layout, font='Courier 12').Finalize()
    
    
    while True:
        event, values = window.read()
        if event == "SEND":
            data = values
            a = list(data.values())
            df = pd.DataFrame(a, index = columns)
            df = df.transpose()
            print(df)

        else:
            print("OVER")
        break
    window.close()
GUI()

What i want to do is for example if the string 'STOCK' is inputted into the TYPE input then the remaining 3 input boxes should be filled with predefined values. For example DIRECTION filled with 'B', Date with 'TODAY' and OPTION with 'PUT'.

I am unsure how to start so any help would be great

Answer 1

Set option enable_events=True in your TYPE input, it will generate events when the content of element changed, then handle it in your event loop if the content of element equal 'STOCK' .

import datetime
from datetime import date
import pandas as pd
import PySimpleGUI as sg


def GUI():

    columns = ["TYPE","DIRECTION","DATE","OPTION"]
    param   = (20,3) # size of the main window

    sg.theme('Dark Brown 1')
    sg.set_options(font=('Courier New', 12))

    listing = [sg.Text(u, size = param) for u in columns]
    core = [
        sg.Input(size=param, enable_events=True, key='INPUT TYPE'),
        sg.Input(size=param),
        sg.Input(size=param),
        sg.Input(size=param),
    ]
    mesh = [[x,y] for (x,y) in list(zip(listing, core))]

    layout = [[sg.Button("SEND")]] + mesh
    window = sg.Window('Trade Entry System', layout, finalize=True)

    while True:
        event, values = window.read()
        if event == sg.WINDOW_CLOSED:
            break
        elif event == "INPUT TYPE" and values[event] == "STOCK":
            for element, value in zip(core[1:], ['B', 'TODAY', 'PUT']):
                element.update(value=value)

    window.close()

GUI()