Jquery

BASIC IDEA

 jQuery is one type of JavaScript
library.
 Simplify Web development
process.
 Used widely.

USP OF JQUERY

JQUERY is an Open
Source

USP OF JQUERY
JQUERY follows this

For e.g. $(“#deleted”).addClass(“red”).fadeOut(“slow”);

USP OF JQUERY

JQUERY supports,
Cross-Browser
Functionality

WHY USE JQUERY?
 Ease of use
JQUERY is reusable
-plug and play
It is Compact
-no need of writing long long javascript

 AJAX support
 $(“#comments”).load(“/get_comments.php”);

 Creates Effects and Animations
Next

var xmlhttp;
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
} else {
// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); $.post(
} 'ajax_test.php',
xmlhttp.open("POST","ajax_test.asp",true); { fname : 'Henry', lname : 'Ford' },
xmlhttp.setRequestHeader("Content- function(resp) {
type","application/x-wwwform- $('#myDiv').html(resp); }
urlencoded"); );
xmlhttp.send("fname=Henry&lname=Ford"); Wednesday, September
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status ==
200) {
document.getElementById("myDiv").innerHTML =
xmlhttp.responseText;
}
};
Wednesday, September Back

 Supports All Versions of CSS
 Size and Speed
 Instant Plug-ins
 Great Documentation
 Large Community

HOW TO USE JQUERY?
 First Download the latest version of JQUERY

.JS file from
http://jquery.com/

Documentation from
http://code.google.com/apis/libraries/devguide.html#jquery

Plug-ins from
http://plugins.jquery.com/

KNOW JQUERY'S PARTS
Find Some Elements
{
$(“DIV”).ADDCLASS(“XYZ”);

jQuery Object }
Do something with them

For e.g.
$(“p”).addClass(“blue”);

<p class=“blue”>Hello Students</p>

SELECTORS
#header{
Imagine any CSS file margin : 0
}
div{
margin : 0px;
padding : 0px
}
ul.menu li{
…..
}

Selecting By Id $(“#header”)

FILTERS
 Basic Filters :
 :first, :last, :even, :odd, …...
 Content Filters:
 :empty , :contains(text), :has(selector), …..
 Attribute Filters:
 [attribute], [attribute=value], [attribute!=value], …..

For e.g.
$(“#students tr:even”).css(“background-color”, “#dde”)

It selects even elements and change BGcolor of that <td> (index starts from zero)
Name Class Roll No. Comment
Raju XII 2 Good
Masud IX 1 Good
Apu XII 3

JQUERY METHODS
 DOM Manipulation
 before(), after(), append(), appendTo(), …..
 Attributes
 css(), addClass(), attr(), html(), val(), …..
 Events
 click(), bind(), unbind(), live(), …..
 Effects
 hide(), fadeOut(), toggle(), animate(), …..
 Ajax
 load(), get(), ajax(),.ajaxStart()…..

DOM MANIPULATION EXAMPLE
Move all paragraphs in div with id “contents”
<body>
<h1>jQuery</h1>
<p>jQuery is good</p>
<p>jQuery is better</p>
<div id=“contents”></div>
<p>jQuery is the best</p>

</body>

$(“p”).appendTo(“#contents”); will append <p> in <div id=“contents”>
<h1>jQuery</h1>
<div id=“contents”>
<p>jQuery is good</p>
<p>jQuery is the
best</p>
</div>

ATTRIBUTE EXAMPLE
Make the texts of last paragraph bold

$(“#contents p:last”).css(“color”, “green”);
<body>
<h1>jQuery Dom Manipulation</h1>
<div id=“contents”>
<p >jQuery is good</p>
<p style=“color:green”>jQuery is the best</p>
</div>
</body>

Also we can Get or Set the values of attributes :
Set : $(“img.logo”).attr(“align”, “left”);
Get : var allignment = $(“img.logo”).attr(“align”);

IMPLEMENTING JQUERY
We can implement JQUERY in two ways
function slideSwitch()
{
From Scratch var $active = $('#slideshow IMG.active');
var $next = $active.next();
$next.addClass('active');
$active.removeClass('active');
}
$(function() { setInterval( "slideSwitch()", 5000 ); });

Use ready plug-ins

USING PLUG-INS
 Download the plug-in (any version)
 Unzip the downloaded file to a folder and put it whichever
application you are using.
 Add the plug-in's JavaScript and CSS files inside the header
section of your Web page:
 For e.g
<script src="http://code.jquery.com/jquery-1.4.2.min.js"></script>
<script src="star-rating/jquery.rating.js"></script>

 Change in styles and css according to your needs
 And you are ready to use your customized plug-ins .

SOURCE
 Links :-
 jquery.com
 http://blog.themeforest.net/
 http://code.google.com/apis/libraries/devguide.html#jquery
 http://en.wikipedia.org/wiki/JQuery#Etymology

 E-Books :-
 JQUERY NOVICE TO NINJA
-earle castledine & craig sharkie

Jquery

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