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jQuery 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 Installation

It two very simple steps:

  • Download jQuery from the download page and get the latest version of it.
  • Now put the jQuery in your website directory

jQuery Usage

Now link the jQuery in your webpage:


<head>
<script type="text/javascript" src="jquery-1.3.2.min.js"></script>
</head>


Example of jQuery

<html>
<head>
<script type="text/javascript" src="jquery-1.3.2.min.js"></script>
<script type="text/javascript" language="javascript">
$(document).ready(function(){
$("p").click(function(){
alert("Hello");
});
});
</script>
</head>
<body>
<p>Click Me</p>
</body>
</html>

You can also use jQuery in seperate file with .js extension.


$(document).ready(function(){
$("p").click(function(){
alert("Hello");
});
});

Save the file with filename.js and add the link in your webpage.


jQuery Syntax

$(selector).action() 
$("p").click()
$("#demo").hide()

  • A $ sign to define/access jQuery
  • A (selector) to "query (or find)" HTML elements
  • A jQuery action() to be performed on the element(s)
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