Today's World Wide Web is a dynamic environment, and its users set a high bar for both style and function of sites. To build interesting, interactive sites, developers are turning to JavaScript libraries such as jQuery to automate common tasks and simplify complicated ones. One reason the jQuery library is a popular choice is its ability to assist in a wide range of tasks.
Because jQuery does perform so many different functions, it can seem challenging to know where to begin. Yet, there is a coherence and symmetry to the design of the library; most of its concepts are borrowed from the structure of HTML and Cascading Style Sheets (CSS). Because many web developers have more experience with these technologies than with JavaScript, the library's design lends itself to a quick start for designers with little programming experience. In fact, in this opening chapter we'll write a functioning jQuery program in just three lines of code. On the other hand, experienced programmers will also be aided by this conceptual consistency, as we'll see in the later, more advanced chapters.
But before we illustrate the operation of the library with an example, we should discuss why we might need it in the first place.
Okey, let's begin, at first you may ask "What you have to know, before learning jQuery?"
Here's what you should learn before starting to learn jQuery:
1. HTML / XHTML
Better yet, if you complete your reading of the standard HTM / XHTML, XML.
2. CSS
How do you use a CSS Selector? id or classes?
3. JavaScript
Mastering Java Sript important so that you can compare the use JavaSript without jQuery with jQuery itself.
What you can do using jQuery?
1. Ease of access document element.
2. Modification of web page views.
3. Changing the contents of the document.
4. Responding to user interaction.
5. Animating: about changes made to the document.
6. Retrieving information from a server without a page refresh.
7. Simplified JavaScript common tasks.
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