JavaScript: Difference between revisions

Revision as of 18:22, 27 April 2012

Revision as of 22:50, 27 April 2012

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The most common use of JavaScript is to write functions that are embedded in or included from [[HTML]] pages and that interact with the [[Document Object Model]] (DOM) of the page. Some simple examples of this usage are:

* Loading new page content or submitting data to the server via [[AJAX]] without reloading the page (for example, a social network might allow the user to post status updates without leaving the page)

* Opening or [[Pop-up ad|popping up]] a new window with programmatic control over the size, position, and attributes of the new window (e.g. whether the menus, toolbars, etc., are visible).

* Animation of page elements, fading them in and out, resizing them, moving them, etc.

* Interactive content, for example games, and playing audio and video

* [[Data validation|Validating]] input values of a [[form (web)|web form]] to make sure that they are acceptable before being submitted to the server.

* Changing images as the mouse cursor [[Rollover (web design)|moves over them]]: This effect is often used to draw the user's attention to important links displayed as graphical elements.

* Transmitting information about the user's reading habits and browsing activities to various websites. Web pages frequently do this for [[web analytics]], [[ad tracking]], [[personalization]] or other purposes.<ref>{{cite web | url=http://piwik.org/docs/javascript-tracking/ | title=JavaScript tracking - Piwik | publisher=[[Piwik]] | accessdate=31 March 2012 17:56 (UTC)}}</ref>