From Seo Wiki - Search Engine Optimization and Programming Languages
A clickable image is an image that can be activated using a computer mouse. The term can be used to refer to graphical buttons in a graphical user interface (GUI) such as that found in Microsoft Windows or Apple's Mac OS X.
However, it is most often used to describe a method of superimposing hyperlinks on an image held in a webpage. Clickable image maps can be implemented in two ways: as client-side image maps and as server-side image maps.
Client-side image maps
For client-side image maps, the client's browser software controls the way in which the user interacts with the image.
The simplest implementation method is to use HTML image maps. Explicit pixel co-ordinates of rectangles and other shapes representing hot spots can be defined in HTML code. When the user clicks on one of these, the browser navigates to the hyperlink that has been specified in the code. This form of image map gives no feedback to the user of the location of these hot spots, or of which one has been selected, prior to the activation of the hyperlink.
Server-side image maps
For server-side image maps, When the user clicks on the image, the screen coordinates are sent directly to the server where the document resides. Mouse coordinates, expressed as screen pixel values relative to the image are picked up by the server and the server redraws the image accordingly.
Good examples of clickable images can be found on the web at the following locations:
- Use of XHTML and CSS
- Use of XHTML and CSS to display additional data
- Use of Java Applet
|File:Crystal Clear app browser.png||This World Wide Web-related article is a stub. You can help Wikipedia by expanding it.|