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jQuery Tutorial for Beginners

jQuery Tutorials
In this article we are going to take a look at introduction to jQuery, what it is, what is does and why we should use in our website.
If you are looking to perform Ajax operations in your website with lot of cool effects on it and you are not completely familiar with java script, then jQuery is a very easy and flexible way to integrate thing like effects, Ajax, animation and so on.

A Little Bit About jQuery

jQuery is Open-Source JavaScript library that contains variety of functions and other functionality that allows you to do the effects in an easier way and it is widely used for the below advantages.

  • DOM manipulation
  • AJAX
  • Animations
  • Extensibility through plugins


Why should you use it?

  • Easy to learn! It uses CSS syntax for selection
  • Its tiny 93.5 KB, it loads really fast in most browsers.
  • Documented & Supported
  • Cross browser compatibility: IE 6+, FF 2+ and with most major browsers
  • It is the most used JavaScript library on the web today
    • 39% of all sites that use JavaScript use jQuery.


How to use jQuery

In order to use jQuery you need to load it, you can either include it locally on your own server:

  • <script src=”/js/jquery.js”>

Or use one of the CDN’s made available:


Introduction to DOM?

The DOM is everything you write in your html documents, images, css, all your tags, everything. When a web page is loaded, the browser creates a Document Object Model of the page. The HTML DOM model is constructed as a tree of Objects.


The DOM is a mess. There are a million different ways to accomplish things within it and many different doctypes and uppercase and lowercase are allowed attributes that sometimes need quotes, and other times don’t. JQuery is coded around all those inconsistencies.

JQuery can modify the DOM, but it can’t do so until the DOM is ready. So how can I be sure my code runs at DOM ready?
Wrap all your jQuery code with the document ready function.

// all jQuery code goes here


Load Scripts at the Bottom

When scripts are downloading they block everything else in almost all browsers!
Best practice: The DOM is loaded top to bottom, so include your scripts at the bottom of your page so they don’t interrupt page content downloads.

And BOOM! Goes The Dynamite!!!

Break It Down!

Basic jQuery Selectors


$("div"); // selects all HTML div elements
$("#myElement"); // selects one HTML element with ID "myElement"
$(".myClass"); // selects HTML elements with class "myClass"
$("p#myElement"); // selects paragraph elements with ID "myElement"
$("ul li a.navigation"); // selects anchors with class "navigation" that are nested in list items
$("p > a"); // selects anchors that are direct children of paragraphs
$("input[type=text]"); // selects inputs that have specified type
$("a:first"); // selects the first anchor on the page
$("p:odd"); // selects all odd numbered paragraphs
$("li:first-child"); // every list item that's first child in a list


Manipulating and Accessing CSS Class Names

JQuery allows you to easily add, remove, and toggle CSS classes, which comes in handy for a variety of practical uses. Here are the different syntaxes for accomplishing this:

$("div").addClass("content"); // adds class "content" to all 
elements $("div").removeClass("content"); // removes class "content" from all
elements $("div").toggleClass("content"); // toggles the class "content" on all
elements //(adds it if it doesn't exist, and removes it if it does)

You can also check to see if a selected element has a particular CSS class, and then run some code if it does. You would check this using an if statement. Here is an example:

if ($("#myElement").hasClass("content")) {
// do something here

You could also check a set of elements (instead of just one), and the result would return “true” if any one of the elements contained the class.

Manipulating CSS Styles with jQuery

CSS styles can be added to elements easily using jQuery, and it’s done in a cross-browser fashion. Here are some examples to demonstrate this:

$("p").css("width", "400px"); // adds a width to all paragraphs
$("#myElement").css("color", "blue") // makes text color blue on element #myElement
$("ul").css("border", "solid 1px #ccc") // adds a border to all lists


 Hide and Seek





Similar to .show() there is a hide method as well.





You Can Chain Most Methods Together




Getters and Setters

Dual Purpose Methods
jQuery Getter
jQuery Setters

Dealing with Events in jQuery

Specific event handlers can be established using the following code:

$("#myID").click(function() {
// do something here
// when element with id="myID" is clicked is clicked

The code inside function() will only run when an anchor is clicked. Some other common events you might use in jQuery include: blur, focus, hover, keydown, load, mousemove, resize, scroll, submit, select.
I have explained about Ajax implementation in a click event via java web application using jQuery in the article here. In that example I have returned a simple java object from server side to and update in the jsp page via Ajax, Now inorder to return a complex java object from server side I have used JSON for this purpose. Please refer the article here to learn on how to implement Ajax in java web application using jQuery to return complex objects.

Jquery UI

jQuery UI is a curated set of user interface interactions, effects, widgets, and themes built on top of the jQuery JavaScript Library. Whether you’re building highly interactive web applications or you just need to add a date picker to a form control, jQuery UI is the perfect choice.

Refer to learn more on jQueryUi.

Jquery Plugins

“If you want to create an animation, effect or UI component, chances are pretty good that someone has done your work for you already.”
Refer to know more about wide variety of jQuery plugins.
Listed are the few of jQuery plugins which I have explored and found to be greatly useful.

Keep in mind that this tutorial is just a bunch of straightforward code examples and brief explanations for beginners who want to avoid all the jargon and complexities. But I still highly recommend that all beginners get past this stuff by means of a good book, or by using the jQuery documentation. Thanks for reading.

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