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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12
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1answer
25k views

Use of Async/Await for EventHandlers

I have a MVC WinForms application. I am using Dependency Injection with Ninject as the IoC container. ...
3
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0answers
44 views

Simple gallery with scroll

I just created a simple gallery with scroll. Everything works fine but I'm not sure how should I optimize this code: ...
1
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0answers
519 views

Simple Pub-Sub Event Emitter

I have written a basic event emitter in JavaScript and I'd like some feedback on my design. I tried to make it as simple and minimalist as possible, as I'd like it to be understandable by anyone. I ...
3
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1answer
37 views

JavaScript idle managing structure

I am just getting into the world of javascript, coming from the world of classical inheritance. The following is a library I wrote to track when a webapp is idling and I wrote it like I write ...
1
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1answer
104 views

Java application processing GUI input when “Done” is clicked

Right now, I've got this really ugly loop in my code that waits for a boolean to be true before the method can return. It's triggered when "Done" is clicked. I'm ...
3
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0answers
522 views

C++ Event Emitter

I needed an event bus in C++ with a few features: Possibility to add/remove both functions and member methods. Ability to remove automatically those listeners that wrap member methods of expired ...
2
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1answer
901 views

Simple type-safe and thread-safe Rust event system

I'm creating a relatively simple type-safe and thread-safe Rust event system. It is to be used with and within an IRC library I'm making, but should work just fine for other use-cases. It needs to be ...
1
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2answers
255 views

delegate click event on document

I'm adding an onclick listener to the whole document then checking the source of the click. If the source of the click contains the attribute data-widget I want to ...
8
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2answers
2k views

Recorder for keyboard and mouse events

I'm building an event recorder. So far the code looks clean, but I feel like I'm missing something that can make this code even better. Is composition a better solution? If yes, how can I do it ...
1
vote
1answer
20k views

Focus next element on keypress

It's been a year or two since I last dabbled in jQuery and have attempted to write a simple "on key press move to the next element" script. However my first attempt has a lot a repetition. I just ...
2
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0answers
293 views

Event Service in c++

I'm interested in receiving some feedback regarding an Event system that I wrote. Both in style and implementation, but also in overall design and the design decisions that I made. It is intended to ...
3
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1answer
887 views

Event delegation without jQuery

I created event delegation like concept which is present in jQuery. AFAIK, event delegation is used to register an event for an element which is supposed to be added dynamically. So, in jQuery we do ...
0
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2answers
219 views

PageVisibility API, to handle page/tab visibility changes

Currently, I'm working on a project where I needed to run some code every time the page is hidden. I searched high and low and found this question: Is there a way to detect if a browser window is not ...
2
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0answers
198 views

Event Delegates using IIFE or Module

I am learning jQuery/JavaScript best practices and am attempting to put them into practice. My overall goal is to have lots of small, independent .js files which contain specific functionality and ...
7
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2answers
6k views

Yet another event dispatcher in c++11

I've written an event dispatcher for a private project which task is to collect events from different threads and dispatch them in a single thread: ...
2
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1answer
135 views

Overriding the mouseout handler for an image when a button is clicked

I had posted this question in Stack Overflow and they told me it would be better served on Code Review. Is there a more effecient way of changing the mouseout state when a button is clicked? When a ...
3
votes
1answer
4k views

C++11 event system

I've implemented an events system in C++11. I've now got it pretty much as good as I can get it. It feels like I have found an optimal design pattern, and I'm using sensible variable names to ...
1
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2answers
65 views

Keyboard handler for moving in four directions

I'm having trouble deciding if I should leave the default: break; in the switch statement or not. It does kinda show intent, i.e. that most keys are not handled, ...
1
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2answers
82 views

Keyboard handler to move a shape in response to arrow keys

I finished Codeacademy and I'm looking to practice and get better at JavaScript. Is this coded correctly or should I have made a function for it somehow? The purpose of this code is to move a square ...
2
votes
2answers
314 views

Keyboard handler for selecting radio buttons

I have got my JavaScript working as seen here: https://jsfiddle.net/yLg1qs04/3/ But how do I condense/shorten it so that it's not repeating itself so often and taking up so many lines? ...
6
votes
2answers
949 views

Type-Safe Event System

I have recently started writing C# from a strong JavaScript background, and found myself wanting to do something I do all the time in JavaScript: events. Since I have a type system at my disposal, I ...
5
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1answer
3k views

Unit test if an event has been raised or not

Given the following event dispatcher code ...
3
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2answers
7k views

Raise an event (sample 1)

I'm writing tutorials for new programmers. The tutorials show programmers how to structure events. I've attached the code for one of the tutorials. Can someone take a look at my code and let me know ...
11
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1answer
2k views

C++14 Event System

I've created a simplified event system for C++14. The code is commented, so it shouldn't be hard to read. There's also a simple usage scenario below. It is still a work in progress and uses some not-...
3
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1answer
5k views

Removing all delegates from an event dispatcher

Given a class which is an event dispatcher whose underlying store is a dictionary of events whose key is the event type ...
2
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0answers
61 views

Alternative to clicklistener inside an anonymous class

For a trivial word game, I wrote the following code for the player to choose one of the two choices of words that in turn were read from a sentence. My question lies in first in the click-listener of ...
5
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2answers
565 views

Toggling dropdowns using jQuery, with binding and unbinding

This code is used to toggle some dropdowns. I've added the click event on the document to close the dropdown on click outside, but I'm not sure if I'm doing it the right way. I want it to be optimized ...
3
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0answers
40 views

Periodically monitor if record is not updated using Node, Event and setTimeOut

Here is my scenario: Every user checks in every five minutes. If some user doesn't check in after 5 minutes, I should be able to keep track of it. If some user doesn't check in N number of times, an ...
4
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1answer
53 views

Three identical AJAX button handlers in three views

In my Rails 4 app I have this event listener: ...
4
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2answers
291 views

Handling events in a multi threaded environment

I have a service that raises multiple events, some of them can be raised at the same time. I need to process those events and run a potentially long running method based on the event arguments. What I ...
0
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1answer
340 views

Form validation using IIFE and closure [closed]

Problem statement Write an IIFE in which we have to validate the input provided from a form using closures. The form consists of name, email, phone, address in which name, email and phone number ...
4
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3answers
150 views

Track mouse coordinates

Problem Statement Write a JavaScript program that prints the mouse coordinates in a text area when the mouse cursor is moved over the HTML document. Expected Output Solution ...
7
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3answers
198 views

Downloading files from a Mozilla file server via FTP

All classes on GitHub repo This is the code for downloading files from a FTP-server running Mozilla Fileserver. FtpItem is the interface for the two classes ...
4
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2answers
858 views

C++ EventHandler class, invoking & arguments

This is my EventHandler class, which is extremely simple and can be used on lambdas and similar: ...
5
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3answers
4k views

Detect how long an HTML button is pressed

I recently had the need to detect how long a button is pressed and perform different actions based on that. I found some examples on Stack Overflow, but the ones I looked at showed how to use ...
2
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1answer
43 views

Handler for bidirectional unit conversion form

Building a form where values can be entered in either pounds or kilos. Script is... ...
3
votes
1answer
151 views

Animating sprite without libraries

I'm building a small game in pure JS for my own learning purposes, using sprites to model players. Before I go further, I want to try to get the animation down. The below code should produce a blank ...
2
votes
2answers
602 views

Xml messages processing networkstream [closed]

I'm currently processing xml messages with C#. It is working But I'm not confident that my code is fast enough. There are 3 possible messages I can receive. When I receive one the message an event is ...
2
votes
2answers
3k views

Using actionPerformed() to call different methods per radio button selection

My Java is very rusty and I have been unlucky finding a better way to accomplish this task. I have two different methods which get called based on which radio button is selected. Is there a cleaner ...
4
votes
2answers
119 views

Pub/Sub in JavaScript

This seems to work, but for some reason I'm not entirely sure about it. Can anyone point out any issues with this simple pub/sub library? Thank you! ...
7
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0answers
2k views

Implementing my own signal slot mechanism using C++11

I programmed in C# and I used the Qt framework. Both of them have their own signal slot mechanism which are really powerful. I looked at several implementations in C++ and based on what I learnt from ...
4
votes
2answers
2k views

Designing a Backspace key

I have designed a Backspace button (part of a keyboard which I am designing) in windows forms and it works perfect with no errors (the code works very good). This button deletes what is inside the ...
3
votes
1answer
1k views

Resize Images Dynamically

I set out to make a simple dynamic resize method for images. Obviously, it's better to serve images that are pre-sized to avoid unnecessary server loads. But it was fun to make for a novice/beginner ...
3
votes
2answers
524 views

Custom event handler in Javascript

In my web projects I often need a simple way to trigger callbacks defined somewhere else. Leaving jQuery finally behind me, I was missing their simple event system and tried to create my own. I'd like ...
2
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0answers
2k views

C++ 14 event bus implementation

The code allows you to subscribe to events and publish events via an EventBus class. Events are identified by a source and subject. Events can have a single ...
7
votes
1answer
2k views

Event dispatcher / listener

I'm working on a program that will be significantly multi-threaded. I need to respond to events between objects and threads so I've come up with the following code. ...
6
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2answers
766 views

Python Event Dispatcher

This code creates a singleton event dispatcher. It's called like this: ...
3
votes
1answer
171 views

Pomodoro Timer via setTimeout()

I've made my attempt to code timer entirely by hand using jQuery. No external libraries to manage time at all. ...
1
vote
1answer
56 views

Javascript event handling via switch

The application I am developing with has many input fields that interact with one another via the onchange event. When developing started, the goal was to create a framework that makes it easy to ...
4
votes
1answer
838 views

C++ EventHandler Class

I need to have some thread-safe event handler (like C#'s EventHandler), so I made one. Here is my event handler class and sample code (compiled with VS2013). Is ...