JavaScript. A JavaScript library is a library of pre-written JavaScript
What is jQuery
jQuery is a lightweight JavaScript library that simplifies programming with
JavaScript.
A JavaScript library is a library of pre-written JavaScript which allows for easier
development of JavaScript-based applications, especially for AJAX and other
web-centric technologies.
According to
jQuery is a fast, small, and feature-rich JavaScript library. It makes things like
HTML document traversal and manipulation, event handling, animation, and
Ajax much simpler with an easy-to-use API that works across a multitude of
browsers. With a combination of versatility and extensibility, jQuery has
changed the way that millions of people write JavaScript.
Advantages of using jQuery over raw JavaScript
The use of JQuery has several benefits over using the raw javascript.
1. jQuery is cross-browser
2. jQuery is a lot more easy to use than raw javascript
3. jQuery simplifies and has rich AJAX support
4. jQuery has large development community and many plugins. Example
autocomplete textbox plugin.
jQuery is a lightweight, "write less, do more", JavaScript library.
The purpose of jQuery is to make it much easier to use JavaScript on your website.
jQuery takes a lot of common tasks that require many lines of JavaScript code to
accomplish, and wraps them into methods that you can call with a single line of code.
jQuery also simplifies a lot of the complicated things from JavaScript, like AJAX calls and
DOM manipulation.
The jQuery library contains the following features:
HTML/DOM manipulation
CSS manipulation
HTML event methods
Effects and animations
AJAX
Utilities
In addition, jQuery has plugins for almost any task out there.
There are lots of other JavaScript frameworks out there, but jQuery seems to be the
most popular, and also the most extendable.
Many of the biggest companies on the Web use jQuery, such as:
Google
Microsoft
IBM
Netflix
The jQuery team knows all about cross-browser issues, and they have written this
knowledge into the jQuery library. jQuery will run exactly the same in all major
browsers.
Adding jQuery to Your Web Pages
There are several ways to start using jQuery on your web site. You can:
Download the jQuery library from
Include jQuery from a CDN, like Google
jQuery CDN
If you don't want to download and host jQuery yourself, you can include it from a
CDN (Content Delivery Network).
Both Google and Microsoft host jQuery.
To use jQuery from Google or Microsoft, use one of the following:
Google CDN:
Microsoft CDN:
One big advantage of using the hosted jQuery from Google or Microsoft:
Many users already have downloaded jQuery from Google or Microsoft when visiting
another site. As a result, it will be loaded from cache when they visit your site, which
leads to faster loading time. Also, most CDN's will make sure that once a user
requests a file from it, it will be served from the server closest to them, which also
leads to faster loading time.
jQuery Syntax
The jQuery syntax is tailor-made for selecting HTML elements and performing some
action on the element(s).
Basic syntax is: $(selector ).action()
A $ sign to define/access jQuery
A (selector) to "query (or find)" HTML elements
A jQuery action() to be performed on the element(s)
Examples:
$(this).hide() - hides the current element.
$("p").hide() - hides all elements.
$(".test").hide() - hides all elements with class="test".
$("#test").hide() - hides the element with id="test".
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