Event handling is a coding style about handling messages between a source and one or more subscribers. A point listener in the source provide a way which subscribed code can consume messages raised from the source.
686
votes
8answers
160k views
event.preventDefault() vs. return false
When I want to prevent other event handlers from executing after a certain event is fired, I can use one of two techniques. I'll use jQuery in the examples, but this applies to plain-JS as well:
#1 ...
347
votes
15answers
141k views
How to debug Javascript/jQuery event bindings with FireBug (or similar tool) [closed]
I need to debug a web application that uses jQuery to do some fairly complex and messy DOM manipulation. At one point, some of the events that were bound to particular elements, are not fired and ...
78
votes
4answers
8k views
Do event handlers stop garbage collection from occuring?
If I have the following code:
MyClass pClass = new MyClass();
pClass.MyEvent += MyFunction;
pClass = null;
Will pClass be garbage collected? Or will it hang around still firing its events whenever ...
72
votes
7answers
28k views
jQuery: $().click(fn) vs. $().bind('click',fn);
When using jQuery to hookup an event handler, is there any difference between using the click method
$().click(fn)
versus using the bind method
$().bind('click',fn);
Other than bind's optional ...
62
votes
7answers
59k views
jQuery equivalent of JavaScript's addEventListener method
I'm trying to find the jQuery equivalent of this JavaScript method call:
document.addEventListener('click', select_element, true);
I've gotten as far as:
$(document).click(select_element);
but ...
59
votes
1answer
15k views
C#: How to remove a lambda event handler [duplicate]
Possible Duplicates:
Unsubscribe anonymous method in C#
How do I Unregister ‘anonymous’ event handler
I recently discovered that I can use lambdas to create simple event ...
57
votes
2answers
17k views
Is it necessary to explicitly remove event handlers in C#
I have a class that offers up a few events. That class is declared globally but not instanced upon that global declaration--it's instanced on an as-needed basis in the methods that need it.
Each ...
50
votes
3answers
37k views
How do you handle oncut, oncopy, and onpaste in jQuery?
The jQuery documentation says the library has built-in support for the following events: blur, focus, load, resize, scroll, unload, click, dblclick, mousedown, mouseup, mousemove, mouseover, mouseout, ...
49
votes
5answers
32k views
extjs 4 event handling tutorial [closed]
I've recently started learning ExtJS, I'm looking for a good ExtJS 4 event handling tutorial. I have no experience of any previous versions of ExtJS.
From reading various manuals, guides and ...
47
votes
6answers
50k views
Understanding events and event handlers in C#
I understand the purpose of events, especially within the context of creating user interfaces. I think this is the prototype for creating an event:
public void EventName(object sender, EventArgs e);
...
47
votes
8answers
20k views
Event system in Python
What event system for Python do you use? I'm already aware of pydispatcher, but I was wondering what else can be found, or is commonly used?
I'm not interested in event managers that are part of ...
42
votes
6answers
21k views
Handle URL anchor change event in js
How can I write the JavaScript callback code that will be executed on any changes in the URL anchor?
For example from http://example.com#a to http://example.com#b
38
votes
5answers
28k views
UITextField text change event
How can I detect any text changes in a textField? The delegate method shouldChangeCharactersInRange works for something, but it did not fulfill my need exactly. Since until it returns YES, the ...
38
votes
8answers
8k views
Why are only final variables accessible in anonymous class?
a can only be final here. Why? How can I reassign a in onClick() method without keeping it as private member?
private void f(Button b, final int a){
b.addClickHandler(new ClickHandler() {
...
36
votes
3answers
6k views
C#: Difference between ' += anEvent' and ' += new EventHandler(anEvent)'
Take the below code:
private void anEvent(object sender, EventArgs e) {
//some code
}
What is the difference between the following ?
[object].[event] += anEvent;
//and
[object].[event] += ...
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