event-handling

问题 Does anyone know of an event loop library (or bindings) available for Python 3? It's okay if it only does UNIX systems, though I would prefer something that does Windows as well. ETA : I realize that it is not terribly difficult to write an event loop system. However, I don't want to reinvent the wheel (we are still encouraging not doing so these days, right? ;-)) This is planned for a server application, so obviously I'd want something that isn't tied to a GUI widget toolkit or something. If

问题 How can I prevent an event from bubbling up to parent in javascript? Eg. <tr id="my_tr" onclick="javascript:my_tr_click();"> <td> <a id="my_atag" href="javascript:void(0);" onclick="javascript:my_a_click();">Delete</a> <td> </tr> When I click on "Delete" anchor tag, first the my_a_click() function gets called, and then the parent tr onclick function - my_tr_click() - gets called. This, I believe, is called event propagation. How can I stop that my_tr_click() function from getting called when

问题 I did write a windows service that can connect to a network device using a dll. so everything works fine, but The event handler does not work in win service! here is my code : My Custom Class Code : using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MyNewService { public class zkemkeeperHandler { public event EventHandler OnFinger; public event EventHandler<VerifyEventArgs> OnVerify; private System.Diagnostics.EventLog eventLog1 = new System

问题 Is there any way that I could detect in the following code that either user clicked "leave page" or "stay on page" button ? $(window).on('beforeunload', function (){ return "You save some unsaved data, Do you want to leave?"; }); 回答1: With a few hacks you can at least determine if the user stayed. If the user left the page, there's not much you can do about that : var timeout; $(window).on('beforeunload', function (){ timeout = setTimeout(function() { // user stayed, do stuff here }, 1000);

问题 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

问题 If not, what is their difference? 回答1: 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. 回答2: 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

问题 How can i achieve event handling for dynamic controls in VB6? Any ideas? 回答1: The easiest way is to declare a module-level variable of the same type as the control, and use the WithEvents keyword. For example Option Explicit ' Declare object variable as CommandButton and handle the events.' Private WithEvents cmdObject As CommandButton Private Sub Form_Load() 'Add button control and keep a reference in the WithEvents variable' Set cmdObject = Form1.Controls.Add("VB.CommandButton", "cmdOne")

问题 I am studying on the programming in DDD and event source. I saw one example that when a domain logic was called (e.g. Order.placeOrder() ) it would publish an event (e.g. OrderPlaced ). And the event would be sent to MQ as the event store. The domain logic ( Order.placeOrder() ) should be an atomic API, and it should have @Transactional annotation if using Spring for the transaction manager. And now my question is: How to make sure the DB change and event sending are within the same

问题 The question, in brief: In MVC, how do you distinguish between a checkbox click (or a selectbox or listbox change) from a human meaning "Controller, modify the model", and a checkbox click (or a selectbox or listbox change) from the Controller meaning "I'm updating the view because the model has changed"? The example: I have a JS app (all one big HTML+JS page; there's a server behind it, and AJAX going on, but it's not important to the example) which has the notion of "Vertices" connected by

问题 The question, in brief: In MVC, how do you distinguish between a checkbox click (or a selectbox or listbox change) from a human meaning "Controller, modify the model", and a checkbox click (or a selectbox or listbox change) from the Controller meaning "I'm updating the view because the model has changed"? The example: I have a JS app (all one big HTML+JS page; there's a server behind it, and AJAX going on, but it's not important to the example) which has the notion of "Vertices" connected by