Learning jQuery

A common pattern in jQuery plugin development is the need to undo what the plugin has done. This is usually handled through a method prefixed with “un”. Another common pattern is the use of anonymous functions for event handlers. Unbinding events is easy with jQuery but unbinding a single event handler requires the use of a named function. jQuery 1.2 now provides another option for binding and unbinding events: event namespaces.

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Sometimes it is very convenient to store information on an element by using custom properties (DOM Expandos). For example, I use DOM Expandos in my Mouse Wheel plugin to store an array of handler methods (_mwHandlers) along with a method (_mwHandler) to call all those handlers when the mouse wheel is used. Storing these methods on the element allows me to write less code, and manage scope easier. It also gives me a function reference for easy removal when needed.

Now, what if I needed to select all elements that have a mouse wheel handler on them?

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Need to clone an element and its events? Sure, you could rebind the events after doing the clone, but that wouldn’t be very DRY now, would it? Introducing Copy Events, a new plugin for jQuery.

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