event-handling | 易学教程

HTML5 / JS storage event handler

阅读更多关于 HTML5 / JS storage event handler

问题 I'm using safari webkit's engine together with HTML5 and JS to create an offline application now I'm using the sessionStorage array to store status of my application(simulation). the storage data works fine with the inspector the functions work fine it's the event handler that isn't responding the test preformd by Anurag at http://jsfiddle.net/pvRgH/ also doesn't work here window.addEventListener('storage', storageEventHandler, false); function storageEventHandler(evt){ alert("storage event

How to handle keyboard events in subclass of NSViewController?

阅读更多关于 How to handle keyboard events in subclass of NSViewController?

I am creating one cocoa application having wizard like structure. All dialogs are subclass of NSViewController. Currently I am not able get keyboard events such as keyDown and keyUp.. Please help me to solve this problem.... Thanks in advance.... Override keyDown: and keyUp: method. -(void)keyUp:(NSEvent*)event -(void)keyDown:(NSEvent*)event and - (BOOL)acceptsFirstResponder { return YES; } In subclass of NSViewController you should refer Cocoa Event-Handling Guide . If you are trying to simply get an event for escape, use this instead: override var acceptsFirstResponder: Bool { return true }

Help understanding .NET delegates, events, and eventhandlers [duplicate]

阅读更多关于 Help understanding .NET delegates, events, and eventhandlers [duplicate]

问题 This question already has answers here : Why does trying to understand delegates feel like trying to understand the nature of the universe? (6 answers) Closed 9 months ago . In the last couple of days I asked a couple of questions about delegates HERE and HERE. I confess...I don't really understand delegates. And I REALLY REALLY REALLY want to understand and master them. (I can define them--type safe function pointers--but since I have little experience with C type languages it is not really

How to properly use swipeWithEvent to navigate a webView, Obj-C

阅读更多关于 How to properly use swipeWithEvent to navigate a webView, Obj-C

问题 I want to implement the ability to navigate back and fourth in my webView by using the Event swipeWithEvent. However, I have no idea how I am suppose to use this. I have one main webView, and two methods that navigate back and fourth. A big problem here is that I'm not exactly sure how to write this question. I just need to know how to recognize swipe gestures on my webView and call my two methods. Similar to what Safari, Google Chrome, and Mozilla Firefox do. Thanks. EDIT I have implemented

In C#, why can't I test if a event handler is null anywhere outside of the class that it's defined?

阅读更多关于 In C#, why can't I test if a event handler is null anywhere outside of the class that it's defined?

问题 I am sure that I am just not understanding something fundamental about events and/or delegates in C#, but why can't I do the Boolean tests in this code sample: public class UseSomeEventBase { public delegate void SomeEventHandler(object sender, EventArgs e); public event SomeEventHandler SomeEvent; protected void OnSomeEvent(EventArgs e) { // CANONICAL WAY TO TEST EVENT. OF COURSE, THIS WORKS. if (SomeEvent != null) SomeEvent(this, e); } } public class UseSomeEvent : UseSomeEventBase { public

Laravel 5 - Confusion between Event Handlers and Listeners

阅读更多关于 Laravel 5 - Confusion between Event Handlers and Listeners

问题 I'm a bit confused about the different between Events and Listeners . I understood how you can create your events under Events then register them and implement the Handlers in Handlers\Events . So here I have events and the handling of events. They work after I define them in Providers\EventServiceProvider.php protected $listen = [ UserHasSignedUp::class => [ SendWelcomeEmail::class, SendAdminEmail::class ] ]; So what are Listeners ? To me they seem exactly the same thing as Event Handlers ?

How to remove all event listeners from a display object?

阅读更多关于 How to remove all event listeners from a display object?

问题 Is there a way to determine which event listeners are registered with a display object? I want to remove all event listeners from a display object so that I can assign new ones based on context changes in the application. 回答1: jeceuyper is right ... a side not though: DisplayObject extends EventDispatcher , which already does implement IEventDispatcher ... so to be more precise: you need to override addEventListener and removeEventListener to keep track of the listeners ... a few technical

How to set an evenHandler in WPF to all windows (entire application)?

阅读更多关于 How to set an evenHandler in WPF to all windows (entire application)?

How can I set an event handler (such as keydown ) to entire solution, not a single window? Register a global event handler in your application class (App.cs), like this: public partial class App : Application { protected override void OnStartup(StartupEventArgs e) { base.OnStartup(e); EventManager.RegisterClassHandler(typeof(Window), Window.KeyDownEvent, new RoutedEventHandler(Window_KeyDown)); } void Window_KeyDown(object sender, RoutedEventArgs e) { // your code here } } This will handle the KeyDown event for any Window in your app. You can cast e to KeyEventArgs to get to the information

Ckeditor character limitation with charcount plugin

阅读更多关于 Ckeditor character limitation with charcount plugin

How can i prevent users to enter new characters after max character limit is reached ? Ckeditor charcount plugin just shows me the remaining characters, i want it to stop at 0. But it goes minus integers. Here's my html code. <textarea id="myTextEditor1" name="myTextEditor"></textarea> <script type="text/javascript"> CKEDITOR.replace('myTextEditor1', { height: 200, extraPlugins: 'charcount', maxLength: 10, toolbar: 'TinyBare', toolbar_TinyBare: [ ['Bold','Italic','Underline'], ['Undo','Redo'],['Cut','Copy','Paste'], ['NumberedList','BulletedList','Table'],['CharCount'] ] }); </script> Do i

The correct way to do a tunneled event

阅读更多关于 The correct way to do a tunneled event

EDIT : I guess I asked a bit of a XY Problem. I don't really care about getting tunneled events working, what I care about is getting a event raised from the code behind of the parent window to be picked up and reacted to by a control that is a child of that window without explicitly needing to tell the child who its parent is and manually subscribing to the event. I am trying to raise a event in a parent control and having the child controls listen for that event and react to it. From my research I thought I just needed to do a RoutedEvent but I am doing something incorrect. Here is a MCVE