Introduction to jQuery

Introduction to jQuery
www.collaborationtech.co.in
Bengaluru INDIA
Presentation By
Ramananda M.S Rao

Content
Content
Introduction
Getting Started
Selecting and Filtering
DOM
Handling Events
Content and Attributes
Arrays and Iterations
CSS
Ajax Features
Animations and Effects
Custom Events and PlugIns
JQuery Properties
Selector & Traversing
Dimensions
About Us
DD

Introduction
 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.
 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.
Jquery Core Functionality
 The Jquery Core Functionality is used to implement or it implements the functions that
are the core of Jquery. It is also implements the commonly used utilities.
Ajax the Jquery functionality
 The Jquery library provides us very useful utilities to work with the Ajax (Asynchronous
JavaScript and Xml). It includes the functionalities like dealing with the JSON (JavaScript
Object Notation) data and loading contents from pages etc.
Events in Jquery
 This is one of the most commonly used features of Jquery. It is used to simplify the
manipulation process of the DOM (Document Object Model) events. It also provides us
the common event helper functions to use for more efficiency.

Getting Started
You can download jQuery from here: http://jquery.com/download/
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Hello World</title>
<script src="https://code.jquery.com/jquery-
1.11.3.min.js"></script>
</head>
<body>
<h1>Hello, World!</h1>
</body>
</html>

Selectors
 jQuery selectors are one of the most important parts of the jQuery library.
 jQuery selectors are used to "find" (or select) HTML elements based on their name, id, classes, types, attributes,
values of attributes and much more. It's based on the existing CSS Selectors, and in addition, it has some own
custom selectors.
 All selectors in jQuery start with the dollar sign and parentheses: $().
<!DOCTYPE html>
<html lang="en">
<head>
<title>jQuery Select Element by ID</title>
<script src="https://code.jquery.com/jquery-1.11.3.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
// Highlight element with id mark
$("#mark").css("background", "yellow");
});
</script>
</head>
<body>
<p id="mark">This is a paragraph.</p>
<p>This is another paragraph.</p>
<p>This is one more paragraph.</p>
<p><strong>Note:</strong> The value of the id attribute must be unique in an HTML document.</p>
</body>
</html>

Events
 Events are often triggered by the user's interaction with the web page, such as when a link or button is clicked, text is
entered into an input box or textarea, selection is made in a select box, key is pressed on the keyboard, the mouse
pointer is moved etc.
<!DOCTYPE html>
<html lang="en">
<head>
<title>Executing mouse Event in jQuery</title>
<style type="text/css">
p{ padding: 20px; font: 20px sans-serif; background: lightblue;
}
</style>
$("p").click(function(){
$(this).slideUp();
});
});
</script>
</head>
<body>
<p>Click on me and I'll disappear.</p>
</body>
</html>

jQuery Filtering
<!DOCTYPE html>
<html lang="en">
<head>
<title>Selecting the First Element in jQuery</title>
.highlight{ background: yellow; }
</style>
$(document).ready(function(){ $("ul li").first().addClass("highlight");});
</script>
</head>
<body><h2>Unordered List</h2>
<ul> <li>First list item</li> <li>Second list item</li>
<li>Third list item</li> <li>Fourth list item</li></ul><hr>
<h2>Another Unordered List</h2>
<ul> <li>First list item</li> <li>Second list item</li>
<li>Third list item</li> <li>Fourth list item</li> </ul>
</body>
</html>

jQuery Filtering
<!DOCTYPE html>
<html lang="en">
<head>
<title>Selecting the Last Element in jQuery</title>
.highlight{background: yellow; }
</style>
$("ul li").last().addClass("highlight");
});
</script>
</head>
<body>
<h2>Unordered List</h2>
<ul><li>First list item</li><li>Second list item</li>
<li>Third list item</li><li>Fourth list item</li></ul><hr>
<h2>Another Unordered List</h2>
<ul> <li>First list item</li><li>Second list item</li>
<li>Third list item</li> <li>Fourth list item</li></ul>
</body>
</html>

jQuery ajax
<!DOCTYPE html>
<html>
<head>
<script
src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$("button").click(function(){
$("#div1").load("demo_test.txt");
});
});
</script>
</head>
<body>
<div id="div1"><h2>Let jQuery AJAX Change This Text</h2></div>
<button>Click Me</button>
</body>
</html>

jQuery ajax
demo_test.txt
<!DOCTYPE html>
<html>
<head>
<script
src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquer
y.min.js"></script>
</head>
<body>
<h2>jQuery and AJAX is FUN</h2>
<p id="p1">Welcome to Collaboration Technologies</p>
</body>
</html>

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Introduction to jQuery

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