Download Extending jQuery by Keith Wood PDF

By Keith Wood

Sass and Compass in motion Extending jQuery teaches you to construct customized extensions to the jQuery library. It covers the entire extension issues inside jQuery and gives instructions and strategies on how you can utilize them. Youll not just notice tips to write plugins, yet how one can layout them for optimum reuse. Youll additionally how to write new widgets and results for jQuery UI. alongside the best way, youll discover extensions in key parts together with Ajax, occasions, animation, and validation.

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Originally, the library was called jSelect to reflect its ability to select elements within a web page. 1 (not all versions are shown). Over the years, it’s grown greatly in terms of functionality and size. org/blog/barcampnyc-wrap-up/. 3 July 3, 2013 236 KB New Event APIs: on() and off(), event delegation performance Sizzle rewritten, animations reimagined, more modularity Although the size of the jQuery library has grown substantially, when you minimize the code (stripping unnecessary comments and whitespace) it’s reduced to about onethird of its source size (the latest version is only 91 KB).

NOTE Although initially developed as part of jQuery, the Sizzle selector engine has been released as a separate project for use with any JavaScript 30 What are selectors and filters? 31 library. org/; not to be confused with the Dojo Toolkit). Interest has come from other JavaScript communities, with the aim of enhancing the engine for everyone’s benefit. 1 What are selectors and filters? jQuery selectors are based on the selectors defined in the CSS specifications. They’re string values that identify elements of interest within the HTML DOM.

The most common type of plugin created for jQuery is a collection plugin that adds functionality to a set of elements retrieved via the jQuery selection process or a subsequent traversal of the DOM. As a simple example of this type, you could create a watermark plugin that provides an in-field label when necessary. This will give you a feel for how a plugin is constructed. 1 Placeholder text To conserve space within a form, sometimes the label for a field is omitted and is replaced by a placeholder (a label value within the field itself that disappears when you start working with the field).

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