jQuery What is it?

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Who hasn’t gotten this question yet: jQuery What is it?

Source: http://www.w3schools.com/jquery/jquery_intro.asp

Definition:
jQuery is a lightweight, “write less, do more”, JavaScript library.
jQuery is a cross-platform JavaScript library designed to simplify the client-side scripting of HTML.

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Purpose
The purpose of jQuery is to make it much easier to use JavaScript on your website.
jQuery’s syntax is designed to make it easier to navigate a document, select DOM elements, create animations, handle events, and develop Ajax applications
jQuery also simplifies a lot of the complicated things from JavaScript, like AJAX calls and DOM manipulation.

What is in it
The jQuery library contains the following features:

  • HTML/DOM manipulation
  • CSS manipulation
  • HTML event methods
  • Effects and animations
  • AJAX
  • Utilities

Advantages:
The modular approach to the jQuery library allows the creation of powerful dynamic web pages and web applications.
jQuery has plugins for almost any task out there.

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”.

Example of html page including jQuery code:
jQuery_Code_Example
Test it below:






If you click on me, I will disappear.

Click me away!

Click me too!




More on jQuery:
[jQuery Guide and Resources]