Scripting languages are programming languages mostly (but not necessarily exclusively) used for scripting that don't require an explicit compilation step. Jquery provides a powerful and supercharged selector function to select elements based on html tag-names (e.G., , ), html id attribute (e.G., #debug), and css class name (e.G.,error). Make sure you understand the javascript syntaxes and types, in particular, functions and objects. It's one of the javascript libraries that store sets of pre-written javascript code.

You will learn how to add jquery to web pages and how to traverse the dom. The $('.Non-existence') class-selector selected zero elements, wrap in a jquery object, identified as object. At w3schools you will find a complete reference of all jquery selectors, methods, properties and events. The $('p:first') selects the first element in the jQuery Tutorial . You'll also learn how to use effects, event handlers and style methods.

The $(document).Ready(handler) attaches an event handler, which will be fired once the dom tree is constructed. We wrap our jquery operations under the ready(), as these codes are placed in the section, before the referenced elements are constructed in the this is a common jquery practice. Instead, you can attach the event handler to and then delegate it to , viaon() optional argument selector.

Load data from the server and place the return html inside the matched element. Jquery provides you a number of searching methods of sibling elements. As $ is more concise than jquery it is the generally the preferred method of writing jquery code. Copy the javascript file (e.G., ) under your document root directory, typically under a sub-directory "Js". Learn the basics of jquery, a javascript library that allows you to easily add dynamic behavior to static web pages.

With jquery you can traverse up the dom tree to find ancestors of an element. It is the simplest ajax method to load data from server. It has since gone beyond xml, and currently serves as a client-side technology for javascript to transfer data between browser and server in the background asynchronously, so as to provide better responsiveness, without locking down the browser.