jQuery | Introduction
Note: The only library available today that meets the needs of both designer types and programmer types is jQuery.
jQuery is widely famous with its philosophy of “Write less, do more.” This philosophy can be further elaborated as three concepts:
- Finding some elements (via CSS selectors) and doing something with them (via jQuery methods) i.e. locate a set of elements in the DOM, and then do something with that set of elements.
- Chaining multiple jQuery methods on a set of elements
- Using the jQuery wrapper and implicit iteration
Using jQuery (JS) library on HTML page
There are several ways to start using jQuery on your web site.
- Use the Google-hosted/ Microsoft-hosted content delivery network (CDN) to include a version of jQuery.
- Download own version of jQuery from jQuery.com and host it on own server or local filesystem.
Note: All jQuery methods are inside a document-ready event to prevent any jQuery code from running before the document is finished loading (is ready).
Basic syntax for any jQuery function is:
- A $ sign is to define/access jQuery
- A (selector) is to “query (or find)” HTML elements in html page
- A jQuery action() is the action to be performed on the selected element(s)
Some of the key points which support the answer for why to use jQuery:
- It is incredibly popular, which is to say it has a large community of users and a healthy amount of contributors who participate as developers and evangelists.
- It normalizes the differences between web browsers so that you don’t have to.
- It is intentionally a lightweight footprint with a simple yet clever plugin architecture.
- Its repository of plugins is vast and has seen steady growth since jQuery’s release.
- Large development community
- It has a good and comprehensive documentation
- JQuery lets users develop Ajax templates with ease, Ajax enables a sleeker interface where actions can be performed on pages without requiring the entire page to be reloaded.
- Being Light weight and a powerful chaining capabilities makes jQuery more strong.