event-handling

I am new to Node, and I am struggling to understand the main difference between Events and Functions. Both need to be triggered, so why do we need an Event at all if we have to trigger it anyway? How is it different than having a Function triggered? Example code: var events = require('events'); var eventEmitter = new events.EventEmitter(); eventEmitter.on('event1', function () { console.log('Event 1 executed.'); eventEmitter.emit('event2'); }); eventEmitter.on('event2', function() { console.log('Event 2 executed.'); }); eventEmitter.emit('event1'); console.log('Program Ended.'); We can achieve

im playing a video in WPF.i want it to loop so what i did is when the mediaended event fires, i play back my video. so this will get me a loop. prob is why do u i have to create new source again? why cant i just call 'play'? i dont want to do it in XAML as for some reason. have a look at my code snippet: string startPath System.IO.Path.GetDirectoryName(Process.GetCurrentProcess().MainModule.FileName); public Window1() { InitializeComponent(); media.Source = new Uri(startPath + @"playlist.wpl"); media.play(); } private void Media_Ended(object sender, EventArgs e) { media.Source = new Uri

There is a problem with UI update in WPF. I have such code: private void ButtonClick_EventHandler(object sender, RoutedEventArgs e) { Label.Visibility = Visibility.Visible; TextBox.Text = "Processing..."; LongTimeMethod(); //some long operation } The problem is that until LongTimeMethod ends (that is event handler ends), Label.Visibility and TextBox.Text will not be changed. I solved it like this so far: private void ButtonClick_EventHandler(object sender, RoutedEventArgs e) { Label.Visibility = Visibility.Visible; TextBox.Text = "Processing..."; Dispatcher.BeginInvoke(new Action

I have used Node.js for a while now and I just realized it can be blocking. I just cannot wrap my brain around the conditions under which Node.js becomes blocking. So, Node.js is single-threaded because (i) Javascript is and (ii) avoids all the multi-threaded pitfalls. To do a lot of things at once, despite being single-threaded, it implements asynchronous execution. So, talking with the DB (the I/O in general) is non-blocking (because it is asynchronous). But, all the incoming requests to do some work (i.e. talk with the DB) and all the results of that work that must go back to the client (i

If not, what is their difference? The listener is the object that receives notification, the handler is the method that actually handles the notification. Registration means to register a new listener to the event source. The Event Handler is the method that gets called to handle the Event. The Event Listener is the mechanism that listens for the Event to happen. It then calls the Event Handlers. Event Registration is the process by which an Event Handler gets registered with an Event Listener so that the handler is called when the Event Listener fires the event. Event handlers and event

Is there a way in javascript to bind an event handler to a horizontal scroll as opposed to the generic scroll event which is fired when the user scrolls horizontally and vertically? I want to trigger an event only when the user scrolls horizontally. I searched around for an answer to this question, but couldn't seem to find anything. Thanks! P.S. My apologies if I'm using some terminology incorrectly. I'm fairly new to javascript. UPDATE Thanks so much for all your answers! In summary, it looks like you are all saying that this isn't supported in javascript, but I that I can accomplish the

In my WPF application I would like to attach an input gesture to a command so that the input gesture is globally available in the main window, no matter which control has the focus. In my case I would like to bind Key.PageDown to a command, however, as soon as certain controls receive the focus (e.g. a TextBox or TreeView control), these controls receive the key events and the command is no longer triggered. These controls have no specific CommandBindings or InputBindings defined. This is how I define my input gesture: XAML: <Window x:Class="Window1" xmlns="http://schemas.microsoft.com/winfx