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POWhen would I use JQuery.Callbacks?
 

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  1. POWhen would I use JQuery.Callbacks?
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    <p>I was looking through new stuff added to jQuery 1.7 and I saw they now have jQuery.Callbacks() <a href="http://api.jquery.com/jQuery.Callbacks/" rel="noreferrer">http://api.jquery.com/jQuery.Callbacks/</a>. </p> <p>The documentation shows you how to use jQuery.callbacks() but not any applicable examples of when I would want to use them.</p> <p>It seems you can add/remove callbacks from a callbacks list and you can do jQuery.callbacks().fire(args), but this just fires off ALL of the callbacks in that list. Maybe I am missing something but this doesn't seem very useful.</p> <p>In my head when I first saw this new functionality I thought you would be able to use it with key/value pairs. Which would then provide a simple way to manage callback functions in a single place in your application. Something like</p> <pre><code>$.callbacks.add("foo", myFunction); </code></pre> <p>and then for example if I wanted to call that callback at the end of my function I could do something like</p> <pre><code>$.callbacks().fire("foo", args); </code></pre> <p>However it doesn't look like you can fire off specific callbacks, you can only fire off all of them with the given arguments or none of them.</p> <p>The closest thing I saw was being given the ability to give the .fire() function a context to set the "this" property </p> <pre><code>.fireWith(context, args) </code></pre> <p>but this doesn't really help much either.</p> <ol> <li><p><strong>Am I misunderstanding the documentation?</strong></p></li> <li><p><strong>If this is the desired functionality what are some applicable examples where this is useful.</strong></p></li> </ol>
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    1. COYou first need to make a callbacks object by doing something like `var callbacks = $.Callbacks();`. Then you can add methods using `callbacks.add(myFunction);` (you don't name them, you just add functions to a list). They are then fired (in order) by `callbacks.fire(args)`. `fireWith` is used to set a context (`this`), but not select which callback to fire. `fireWith` also requires the arguments be an array, for example: `callbacks.fireWith(document, "foo");`.
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      1. POWhen would I use JQuery.Callbacks?
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    2. CO@Rocket I fixed the context error I had in my explanation. I understand you can call all of the callbacks at once with fire and give them all of the same arguments but this does not seem helpful. When would I want to do something like this in my application? Why isn't there functionality to fire off certain callbacks? What problem does this new functionality solve?
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    3. COIt says right at the top of the documentation: "The $.Callbacks() function is **internally used** ...." In other words, you--as a developer who *isn't* working on the jQuery Core--will really have no practical use for it, but they're documenting it anyway to avoid questions like the one you have just asked.
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