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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1answer
272 views

Client Side JavaScript [aka Greasemonkey] Key Event Handler

Description The code captures keypress events that do not occur in a text field and dispatches on the properties of a $command object in the application execution ...
4
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1answer
99 views

Swing Game EyeHandCoordination

Question copied from the book: (Game: eye-hand coordination) Write a program that displays a circle of radius 10 pixels filled with a random color at a random location on a panel, as shown in ...
3
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1answer
181 views

Make one greenlet tell another to shutdown

I am building a commandline app to check proxies, which has a daemon flag (running forever or just once). There are producers, checkers and storers. I want them to run in parallel and be able to ...
0
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1answer
114 views

Highlight Two Closest Points Java Swing

Question from the book: (Geometry: closest pair of points) Write a program that lets the user click on the panel to dynamically create points. Initially, the panel is empty. When a panel has two or ...
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2answers
195 views

CRUD code for a finance WebForm

I have a finance web-application in ASP.NET WebForms using Telerik RAD controls. Two event handlers wound up being very similar in implementation. What steps could I take to improve the organization ...
0
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1answer
79 views

Wait for a “3rd party” element to be appended to the DOM

Let's say we're writing a user script which interacts with a 3rd party site we don't control. We want to open a menu, so we trigger a click on the button and then wait 10ms before accessing the menu (...
2
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0answers
345 views

Swing keybinding to control an animated car

In my textbook there is no mention of keybindings and it encourages the use of keylistener so there isn't any example code using keybindings for its problems. I was wondering if this is sorta close to ...
3
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1answer
55 views

Event-triggering - Ready, On, Fire

I have implemented a kind of thing that does event triggering in Golang. This is open-sourced here. Review and suggestions appreciated. First thing I am trying to implement is adding event listeners ...
4
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1answer
1k views

Google Analytics tracking for HTML 5 video player

The jQuery code is for html5 video event GA tracking and I want to make it a little bit more shorter and cleaner. The code works: I am getting all the events, but would like to make it more simple. <...
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0answers
3k views

An event bus implementation for java

I have implemented an event bus library for Java - JBus. Anybody please care to review my code? It is an open source project and link is provided above. Usage Define events: ...
13
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1answer
27k 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: ...
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0answers
542 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
537 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
934 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 ...
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2answers
258 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
299 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
890 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 ...
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2answers
222 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
201 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 ...
8
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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
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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, ...
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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
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2answers
349 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
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2answers
965 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
62 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
votes
2answers
571 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
54 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
297 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
votes
1answer
346 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
votes
3answers
160 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
206 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
881 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
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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
619 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
4k 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! ...