Using the Bind Method
The
.bind() method registers the type of event and an event handler directly to the DOM element in question. This method has been around the longest and in its day it was a nice abstraction around the various cross-browser issues that existed.
The
Pros
Cons
The
.bind() method will attach the event handler to all of the anchors that are matched! That is not good. Not only is that expensive to implicitly iterate over all of those items to attach an event handler, but it is also wasteful since it is the same event handler over and over again.Pros
- This methods works across various browser implementations.
- It is pretty easy and quick to wire-up event handlers.
- The shorthand methods (
.click(),.hover(), etc...) make it even easier to wire-up event handlers. - For a simple ID selector, using
.bind()not only wires-up quickly, but also when the event fires the event handler is invoked almost immediately.
Cons
- The method attaches the same event handler to every matched element in the selection.
- It doesn't work for elements added dynamically that matches the same selector.
- There are performance concerns when dealing with a large selection.
- The attachment is done upfront which can have performance issues on page load.
Using the Live Method
The
.live() method uses the concept of event delegation to perform its so called "magic". The way you call .live() looks just like how you might call .bind(), which is very convenient. However, under the covers this method works much different. The .live method attaches the event handler to the root level document along with the associated selector and event information. By registering this information on the document it allows one event handler to be used for all events that have bubbled (a.k.a. delegated, propagated) up to it. Once an event has bubbled up to the document jQuery looks at the selector/event metadata to determine which handler it should invoke, if any. This extra work has some impact on performance at the point of user interaction, but the initial register process is fairly speedy.
The good thing about this code as compared to the
Pros
Cons
The
Pros
Cons
Did you know that the jQuery
Pros
Cons
.bind() example above is that it is only attaching the event handler once to the document instead of multiple times. This not only is faster, but less wasteful, however, there are many problems with using this method and they are outlined below.Pros
- There is only one event handler registered instead of the numerous event handlers that could have been registered with the
.bind()method. - The upgrade path from
.bind()to.live()is very small. All you have to do is replace "bind" to "live". - Elements dynamically added to the DOM that match the selector magically work because the real information was registered on the document.
- You can wire-up event handlers before the document ready event helping you utilize possibly unused time.
Cons
- This method is deprecated as of jQuery 1.7 and you should start phasing out its use in your code.
- Chaining is not properly supported using this method.
- The selection that is made is basically thrown away since it is only used to register the event handler on the document.
- Using event.stopPropagation() is no longer helpful because the event has already delegated all the way up to the document.
- Since all selector/event information is attached to the document once an event does occur jQuery has match through its large metadata store using the
matchesSelectormethod to determine which event handler to invoke, if any. - Your events always delegate all the way up to the document. This can affect performance if your DOM is deep.
Using the Delegate Method
The
.delegate() method behaves in a similar fashion to the .live() method, but instead of attaching the selector/event information to the document, you can choose where it is anchored. Just like the .live() method, this technique uses event delegation to work correctly.
If you skipped over the explanation of the .live() method you might want to go back up and read it as I described some of the internal logic that happen.
The .delegate() method is very powerful. The above code will attach the event handler to the unordered list ("#members") along with the selector/event information. This is much more efficient than the .live() method that always attaches the information to the document. In addition a lot of other problematic issues were resolved by introducing the .delegate() method. See the following outline for a detailed list.Pros
- You have the option of choosing where to attach the selector/event information.
- The selection isn't actually performed up front, but is only used to register onto the root element.
- Chaining is supported correctly.
- jQuery still needs to iterate over the selector/event data to determine a match, but since you can choose where the root is the amount of data to sort through can be much smaller.
- Since this technique uses event delegation, it can work with dynamically added elements to the DOM where the selectors match.
- As long as you delegate against the document you can also wire-up event handlers before the document ready event.
Cons
- Changing from a
.bind()to a.delegate()method isn't as straight forward. - There is still the concern of jQuery having to figure out, using the
matchesSelectormethod, which event handler to invoke based on the selector/event information stored at the root element. However, the metadata stored at the root element should be considerably smaller compared to using the.live()method.
Using the On Method
Did you know that the jQuery
.bind(), .live(), and .delegate() methods are just one line pass throughs to the new jQuery 1.7 .on() method? The same is true of the .unbind(),.die(), and .undelegate() methods.Pros
- Brings uniformity to the various event binding methods.
- Simplifies the jQuery code base and removes one level of redirection since the
.bind(),.live(), and.delegate()call this method under the covers. - Still provides all the goodness of the
.delegate()method, while still providing support for the.bind()method if you need it.
Cons
- Brings confusion because the behavior changes based on how you call the method.
