This document provides an overview and introduction to jQuery, including what it is, why it should be used, and examples of its capabilities. jQuery is a JavaScript library that simplifies tasks like DOM manipulation, event handling, and Ajax interactions. It is useful because it reduces coding needs and handles cross-browser compatibility issues. The document demonstrates jQuery's abilities through examples of Ajax usage, DOM traversal, and event handling.

1. BEGINNING
JQUERY
Dr.
Chiang
Dhruv Gairola (TA)

2. Outline
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What is jQuery?
Why use jQuery?
Examples.
AJAX
 DOM traversal
 Event handling
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Upgrades.
Other libraries.
jQuery related products.
Conclusion.

3. What is jQuery?
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Javascript library.
Released January 2006.
Version 1.x and 2.x.
2.x does not work < IE9

4. Why use jQuery?
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Less coding.
Simplify event handling.
Simplify AJAX.
Simplify DOM traversal.
Handling of cross browser issues.
Popular and useful client frameworks depend
on jQuery e.g., Bootstrap, Ember.js
Lot of plugins available.
etc

5. Examples – AJAX.
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Asynchronous Javascript and XML.
XML not necessary, JSON also possible.
Demo.

6. Examples – AJAX.

7. Examples – AJAX.

8. Examples – DOM traversal.
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You can traverse the DOM tree pretty easily.
Demo.

9. Examples – Event handling.
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Bind listeners to your objects.
Callbacks.
Demo.

10. Upgrades.
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Upgrading is essential part of jQuery.
jQuery migrate plugin.
Automated tests (e.g., Selenium) should
reveal problems.
Manual correction thereafter.

11. Other libraries.
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Mootools has more functionality. Some UI
components included in core.
jQuery is easier to learn. Lot of jQuery
plugins. Readable code. Chaining of
methods. Good documentation.
Nice comparison :
http://www.slideshare.net/jeresig/javascriptlibrary-overview-presentation/

12. jQuery related products.
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jQuery UI : Front end effects, widgets,
themes, etc.
jQuery mobile : Front end framework.
Demos.

13. Conclusion.
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Useful framework.
Very popular in industry.
Lot of plugins.
CDNs hosted jQuery code, so browser
loading time isn’t significantly hit.