jQuery

jQuery

1. what is jQuery

   • free, open source library
   • helps creatin highly responsive web design
   • cross browser support
   • abstracts browser specific feature and allows to concentrate on design

2. simplifies common scripting tasks

   • getting & manipulating page contents
   • working with browser even model
   • adding sophisticated events

3. simplifies these scenarios

   • page loads
     • perform page setup
   • event happens
     • retrieve content from page
       • manipulate or animate the content
         • put content back on the page

4. benefits of using jQuery

   • CSS like stntax
   • perform multiple operation on set of elements with one line of code
   • hides various browser quirks (i.e. you can concentrate on result rather than figuring out how to achieve each effect in different browsers)
   • jQuery is extensible (can use 3rd party plug-ins)

5. 8 categorised features

   • 1. Core Functionality
     • implement core jQuery functions as well as commonly used utilities
   • 2. Selection & Traversal
     • deals with DOM and can be thought of of as Query in jQuery
     • functions for finding content in document and navigating among that content
   • 3. Manipulation & CSS
     • functions for editing and changing document content and working with CSS data, such as position info
     • it's a follow on step for selection &traversal
   • 4. Events
     • simplifies working with DOM events and provides common event helper functions
   • 5. Effects
     • functions for creating basic animations and effects such as hiding, showing & moving objects around
   • 6. AJAX
     • utilities for working with AJAX, such loading the content from pages & dealing with JSON data
   • 7. User Interface
     • official plug-in with common interface widgets like slider controls, progress bars, accordions etc.
   • 8. Extensibility
     • enables the construction of jQuery plug-ins that enhance the functionality of the base library