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Questions tagged [event-handling]

Event handling is a coding pattern related to acting on messages between a source and one or more subscribers. A point listener in the source provides a way in which subscribed code can consume messages raised from the source.

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2
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2answers
57 views

Event loop in C++

Writing an EventLoop in C++. Few requirements, from a user perspective: Must be simple to use (as simple as the Javascript event loop) No type casting, no complex registering of event handler. Plain ...
6
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1answer
54 views

Light weight C++ Signals/Slots or Event System

This assumes there is no need to aggregate results from the listeners of a broadcast signal. Technically I guess the slots are whatever your std::function holds, ...
4
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1answer
75 views

More Efficient Way To Search On-Demand

I need better logic that would allow this search to perform quicker and more efficiently. In XAML, I have a DataGrid and a ...
5
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3answers
328 views

Wrap a js function with a fixed this arg

If I use node.addEventListener('click',Wyg.Editor.nodeClickedEvent); then when node is clicked, ...
8
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1answer
230 views

“Block a website” script with vanilla JavaScript

I use this script to block access to a one or more websites with vanilla JavaScript. I find that it helps me avoid some addictive news websites that make me depressed. (Credit to Marat Tanalin for ...
5
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2answers
58 views

Dropdown menu that opens on click using plain Javascript

I made a simple dropdown menu which opens when clicked, and closes when the user clicks anywhere outside the menu. The following is the codebase: ...
4
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3answers
356 views

Process queued data in the background

Currently I'm writing something like a messaging or logging framework (I'm not really sure how you name something like that). There are different servers which have to be notified if something happens....
7
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2answers
153 views

eCommerce Mockup App in JS

I have completed this mockup eCommerce app using Javascript. This version can add products into a shopping cart and automatically calculate the order summary in the shopping cart. It can also delete ...
6
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1answer
111 views

Simple input class change with vanilla JS

I am just testing how I solved simple stuff. Goal: The aim is to expand the width of an input and collapse it. When mouseover ...
1
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1answer
54 views

Automatically select the table rows between two selected rows

The code is to check the rows in a table. If in a table two non consecutive rows are checked then all the in between rows should be selected by itself. Also, after selecting two rows, on selection of ...
2
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2answers
52 views

Cardinal direction enum from range input

Still learning JS and I made the following function to convert degrees into cardinal directions respectively. My first iteration of the code was over 50 lines and I was able to get it down to 13 using ...
4
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2answers
103 views

Dynamically add/remove fields on input

The following code allows users to enter multiple optional quantity fields after first filling in a value of the current quantity input. If the input field contains a value it will then display the ...
4
votes
1answer
59 views

Event triggers for animations using vanilla ES6

I'm new to JS and wanna know right code style or approach to cod Vanilla JS using ES6. To practice this, I'm using ESLint JS code-style of AirBnb and referencing clean-code-javascript repo. However, I ...
4
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1answer
39 views

Responsive, scrollable sidenav for old browsers

The following code has been tested on the latest chromium, on Opera Mini, on Safari for IOS 7 and finally, on the default web browser on android 2.3.3. As you may already know, the CSS ...
3
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1answer
46 views

Simplified board for X's and O's using Tkinter

Recently I am learning to program in Python and in order to practice I tried to program a little game which consists in a board with 9 cells. In this board each player draw an 'X' or 'O' with left or ...
2
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0answers
62 views

Await data coming from an event [closed]

This is a USB related question, but the problem is not USB specific. When reading data from a USB endpoint, there are two patterns I am concerned with. Request/Response like HTTP (done over the Bulk ...
7
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2answers
61 views

Vanilla Javascript: Chained AJAX request

I'd be grateful for a review of my AJAX request. If I have taken the correct approach here and especially any security concerns! I am creating a Purchase Order system for my manager (as part of an ...
12
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2answers
239 views

Emulation of SE's text input control for tags

Introduction I used React to write a component, which is meant to be a faithful emulation of the input for "Tags" which you see at the top of every question/topic on SE. Why this project? If you're ...
1
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0answers
18 views

Creating a reusable plugin (Dialog/Notifier as example)

I started working on a notification system that is pluggable into any project. I have not made any "plugin" type javascript libraries, usually just functions very specific to the project at hand. That ...
2
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0answers
139 views

Angular 8: Scroll spy implementation for a timeline Contents

I have made a timeline component that can have multiple milestone/major/minor as sub components nested within timeline container component. I have also added a side navigation for that lists all ...
5
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2answers
170 views

Crystals Collector game with four clickable buttons

I'm a few weeks into javascript and had to make a simple "crystals collector" app. The app works as intended, but the code is obtuse and repetitive. I'd like to make the app work using just one on ...
2
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1answer
66 views

Toggling a class in JS

I'm toggling the class of an element with this code but I'm pretty sure it can be written more efficiently. ...
2
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0answers
171 views

Event management system in C++

I have this question asked as home assignment for an interview. I submitted my solution and did not get selected. Wanted to know your feedback for the solution. Question: Write a very simple ...
4
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1answer
84 views

How to group custom events [closed]

I have a number of custom events that a class might or might not subscribe to. ...
2
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1answer
46 views

Is this a proper way to cancel an onMouseOver which uses setTimeout? (Vanilla JS)

I've got a working solution for an onMouseOver event which rolls over a set of images and replaces them in the element. Due to my lack of knowledge in JS I would ...
3
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1answer
60 views

Whitelist for textarea and save input to file

I'm working with product codes, so a user can only scan these type of product codes into a textarea. I don't know if my code is written the best way possible, or has good performance. I'm using a ...
3
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2answers
56 views

jQuery dynamic toggle class function

I wrote this function that will toggle a class of a targeted element. Applying the class js_class_toggle to any element will trigger the function when clicking on ...
8
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4answers
517 views

Making an Action<T> event also usable as Action<object> and Action in C#

Edit I've added a second pass at this problem based on the answers that have been posted by other users so far: https://codereview.stackexchange.com/a/221525/75659 Context Before presenting the ...
7
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1answer
117 views

Simple integration of async and tkinter in Python

I've been a fan of coroutines and asynchronous programming for a while, and I recently took a trip down memory lane to when I was using Python's tkinter module for ...
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0answers
20 views

Dragging and dropping a spot using TypeScript

Currently my code is based around mouse events so that it is easier to test but I will be swapping these to touch events once I have had the code reviewed. The idea of the UX is that you need to ...
3
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1answer
206 views

Implicit Async and none async event handlers

I have implemented a event aggregator for our backend. ...
6
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2answers
237 views

Tic-Tac-Toe code in JavaScript

I have developed a tic-tac-toe game in native JavaScript. Can you tell me how to optimize more and what are the missing things? JSBIN The logic, modular approach, testable and scalable? ...
4
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1answer
88 views

<select multiple> with dropdown

I wanted to use <select multiple> but was annoyed by the poor design on desktops which is why I created a version with dropdown: ...
1
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1answer
41 views

Targeting only 1 event in DOM

In the picture below, I want to open a modal when a user clicks anywhere within in the yellow block, including if they click on the white ‘+’ sign. The problem is, the click event happens on a ...
1
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1answer
54 views

ASP.net service that sends email whenever an entity is updated [closed]

I have an ASP.net MVC5 project which involve different domain services, and one of it are EmailService which will send email if entity is updated. ...
10
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0answers
223 views

Windows keylogger in C++

Windows keylogger in C++ Known issues: Not implementing rule of five Having to use hack to use member variables, out_, in static method Pressing caps-lock won't ...
2
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0answers
21 views

UI Event Flow class

Purpose: I wanted a way to improve event clarity and event code organization. I observed that every single event flow went through the following steps: Trigger -> UI Change -> (Async) ...
0
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1answer
83 views

Updating values in a database

I'm using standard jQuery Ajax to update values in the database and reflect the result in an output. This repetition seems like bad practice and I don't know enough about jQuery to consolidate this ...
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3answers
62 views
1
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0answers
13 views

ReactJS code that allows at most one profile pic to be selected

I am making a profile picture selection screen, basically you select a picture pic1, if another picture pic2 is selected, then we cancel the highlight of pic2 and highlight pic1. Here is my code right ...
2
votes
1answer
29 views

De-bouncing a (Gray) Rotary Encoder Switch in C

I would like feedback on the correctness and performance of this code. My priorities are also are readability, simplicity and self-documenting code - but I'm happy with those as they are. I still ...
4
votes
1answer
112 views

UpvoteJS, a simple voting widget in vanilla JavaScript

I implemented a simple voting widget like the one used on Stack Exchange sites, to use for other purposes (see live on bashoneliners.com), as a reusable package, dubbed UpvoteJS. Here's how it works: ...
1
vote
0answers
95 views

Golang message bus for a game engine

I wrote a memory bus struct in golang to allow systems to interact with each other without knowing anything about the receiver. This is for a game engine. I know it's not good to write games in ...
3
votes
1answer
134 views

Drawing shapes in a GDI window

I've been tasked with writing a windows form application that offers some options to modify the drawing of shapes within another window. I have very little experience with event-driven programming and ...
3
votes
0answers
54 views

Javascript Call To Action Modal

I created a simple modal that when a user scrolls down a blog post, a modal pops up. If the user wants to sign up for newsletter, then a form pops up. The only external library I used was body-scroll-...
1
vote
0answers
41 views

Modeling the Aggregates in the following Bounded Context - Domain Driven Design

I'm currently developing an application in ASP.NET Core 2.2 with Domain Driven Design. What you see in here is a Unit Creation page. A Unit is composed of competences. A unit must have at least one ...
1
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1answer
56 views

Keypress output to screen

For a school project, I had to make a keylistener that would output whatever you typed to the screen. A JFrame would be initialized to have the focus required for the listener to work. It uses delete ...
2
votes
1answer
55 views

Monitoring navigation function: logic judgment

Write a simple monitoring navigation function. I feel logic judgment still needs to be optimized. I don't have a clear idea right now about code logic such as reducing ...
2
votes
2answers
157 views

Simple menu with descriptions

If one menu-item is clicked then the description with the same data-filter attribute should be shown. I added a class to the description elements to associate each one with the affiliated menu item. ...
2
votes
0answers
117 views

Observer(Event) system (Signals and Slots), type and template based

Signals are represented as types. You can connect a member function of some instance to the Observer system. This connected function will be called whenever a signal of a type that is the same type as ...