How to get the data from callback function

Example for Callback Function: Callback Function can be passed to a function to print out the size of file after the function reads given text file. Example 1: Callback Function. In this example, we will define a function named printFileLength() that takes file path and callback functions as arguments. First the `handlePhoto` function is declared, then the `downloadPhoto` function is invoked and passed the `handlePhoto` as its callback, and finally `'Download started'` is printed out. Note that the `handlePhoto` is not invoked yet, it is just created and passed as a callback into `downloadPhoto`. jQuery Callback Functions. JavaScript statements are executed line by line. However, with effects, the next line of code can be run even though the effect is not finished. This can create errors. To prevent this, you can create a callback function. A callback function is executed after the current effect is finished. Typescript from v1.4 has the type keyword which declares a type alias (analogous to a typedef in C/C++). You can declare your callback type thus: type CallbackFunction = => void; which declares a function that takes no arguments and returns nothing. A callback function is a function that is passed as an argument to another function, to be “called back” at a later time. A function that accepts other functions as arguments is called a higher-order function , which contains the logic for when the callback function gets executed. It’s probably because you forgot to bind a callback function before passing it down a prop. Today you’ll learn why you need to bind, and how to bind a callback function in React. Handling the this keyword is causing a lot of headaches for many developers. That’s because in JavaScript it is not always clear what this is actually referring ... A callback is a function that is passed to another function as a parameter and then invoked by other functions. The function to which the callback is passed is often referred to as a higher-order function. Conversely, Higher-Order Functions operate on other functions by either taking them as arguments or by returning them. function higherOrder ... The result of this call is the string, "two,four,six,eight". Within the callback function, this refers to the current DOM element for each iteration. The function can return an individual data item or an array of data items to be inserted into the resulting set. When you have a callback that will be called by something other than your code with a specific number of params and you want to pass in additional params you can pass a wrapper function as the callback and inside the wrapper pass the additional param(s). As of jQuery 1.5, the success callback function is also passed a "jqXHR" object (in jQuery 1.4, it was passed the XMLHttpRequest object). However, since JSONP and cross-domain GET requests do not use XHR, in those cases the jqXHR and textStatus parameters passed to the success callback are undefined. Most implementations will specify a success ...

2021.12.02 21:32 Altitude-Dashboard How to get the data from callback function

I am trying to get the data returned by executing the function.

import dearpygui.dearpygui as dpg import pandas as pd import psycopg2 as pg import sqlalchemy import matplotlib as plt import getpass from IPython.display import display from ipywidgets import widgets, Label from sqlalchemy import create_engine from sshtunnel import SSHTunnelForwarder cnx = '' def connect_db(): ssh_tunnel = SSHTunnelForwarder(......) ssh_tunnel.start() global cnx cnx = pg.connect(.....) print("Connection to Stats DB Succeeded") def get_snaps(): output = pd.read_sql_query('''select * from pg_awr_snapshots_cust order by snap_id;''', cnx) print (output) dpg.create_context() dpg.create_viewport(title='DB Performance Monitor', width=1400, height=700) dpg.set_viewport_large_icon("retina_MC0_icon.ico") dpg.setup_dearpygui() with dpg.window(label="Enter Stats DB Details"): dpg.add_text("Connect to the DB") dpg.add_input_text(label="SSHTunnelForwarder",default_value="") dpg.add_input_text(label="ssh_username",default_value="") dpg.add_input_text(label="ssh_password",default_value="") dpg.add_input_text(label="remote_bind_address",default_value="") dpg.add_input_text(label="host",default_value="localhost") dpg.add_input_text(label="port",default_value="ssh_tunnel.local_bind_port") dpg.add_input_text(label="user",default_value="") dpg.add_input_text(label="password",default_value="") dpg.add_input_text(label="database",default_value="") dpg.add_button(label="Connect", callback=connect_db) with dpg.window(label="Get Number of Snaps"): dpg.add_button(label="# of Snaps", callback=get_snaps) dpg.show_viewport() dpg.start_dearpygui() dpg.destroy_context() 
Basically instead of printing in Terminal:
def get_snaps(): output = pd.read_sql_query('''select * from pg_awr_snapshots_cust order by snap_id;''', cnx) print (output) 
I want to capture this output and display it in DearPyGui. The output looks something like:

 snap_id sample_start_time sample_end_time 0 1 2021-11-26 11:03:47.204795+00:00 2021-11-26 11:03:48.644472+00:00 1 1 2021-11-26 11:03:47.204795+00:00 2021-11-26 11:03:48.644472+00:00 2 1 2021-11-26 11:03:47.204795+00:00 2021-11-26 11:03:48.644472+00:00 3 1 2021-11-26 11:03:47.204795+00:00 2021-11-26 11:03:48.644472+00:00 4 1 2021-11-26 11:03:47.204795+00:00 2021-11-26 11:03:48.644472+00:00 5 2 2021-11-26 11:03:52.709566+00:00 2021-11-26 11:03:53.951002+00:00 6 2 2021-11-26 11:03:52.709566+00:00 2021-11-26 11:03:53.951002+00:00 7 2 2021-11-26 11:03:52.709566+00:00 2021-11-26 11:03:53.951002+00:00 8 2 2021-11-26 11:03:52.709566+00:00 2021-11-26 11:03:53.951002+00:00 9 2 2021-11-26 11:03:52.709566+00:00 2021-11-26 11:03:53.951002+00:00 10 3 2021-11-26 11:11:05.357706+00:00 2021-11-26 11:11:06.539857+00:00 
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