JQuery

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jQuery Validation
Atheendrh Kakkothh
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What is jQuery?
• JavaScript Library
• 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
• The jQuery library contains the following features:
 HTML/DOM manipulation
 CSS manipulation
 HTML event methods
 Effects and animations
 AJAX

Why jQuery?
• Cross-browser support (IE 6.0+, FF 1.5+, Safari
2.0+, Opera 9.0+)
• CSS-like syntax – easy for developers/non-
developers to understand
• Active developer community

JQuery
• Powerful JavaScript library
– Simplify common JavaScript tasks
– Access parts of a page
• using CSS or XPath-like expressions
– Modify the appearance of a page
– Alter the content of a page
– Change the user’s interaction with a page
– Add animation to a page
– Provide AJAX support
– Abstract away browser quirks

A Few Examples
• Forms
• Chatboxes
• Menus
• Dropdowns
• Sliders
• Tabs
• Slideshows
• Games

Using jQuery
• 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 jQuery.com
 Include jQuery from the file
<head>
<script src="jquery-1.10.2.min.js"></script>
</head>

The Document Ready Event
• You might have noticed that all jQuery methods in our examples, are inside a
document ready event:
• This is to prevent any jQuery code from running before the document is finished
loading (is ready).
• This also allows you to have your JavaScript code before the body of your
document, in the head section.
$(document).ready(function(){
// jQuery methods go here...
});

jQuery Selectors
• jQuery selectors allow to select and manipulate HTML
element(s).
• jQuery selectors are used to "find" (or select) HTML elements
based on their 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

The #id Selector
The jQuery #id selector uses the id attribute of an HTML tag to find the specific element.
An id should be unique within a page, so you should use the #id selector when you want
to find a single, unique element.
To find an element with a specific id, write a hash character, followed by the id of the
element:
$("#test")
The element Selector
jQuery element selector selects elements based on the element name.
You can select all <p> elements on a page like this:
$("p")
The .class Selector
The jQuery class selector finds elements with a specific class.
To find elements with a specific class, write a period character, followed by the name of the
class:
$(".test")

What are Events?
• All the different visitor's actions that a web page can respond
to are called events.
• An event represents the precise moment when something
happens.
• Examples:
 moving a mouse over an element
 selecting a radio button
 clicking on an element
Click() event
$("p").click(function(){
$(this).hide();
});

Before
validation
After
validation

jQuery Animations
• Animations
• Built in
– fadeIn()
– fadeOut()
– hide()
– show()
– slideDown()
– slideUp()
– toggle()
– slideToggle()
– fadeTo()
– animate()
• See also:
– Easing Plug-in
– jQuery User Interface: http://ui.jquery.com

Who’s using jQuery?
• Google
• Dell
• Bank of America
• Mozilla
• NetFlix
• NB

If this presentation helped you, please visit our
page facebook.com/baabtra and like it.
Thanks in advance.
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JQuery

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