Making Web Pages Dynamic

Can replace some (but not all) CGI functionality?

E.g. HTML form:

• Users enter data and submit it to the server
• a CGI script is used to verify and validate that data.
• passes data across the network -- slow.

How much more interactive could a site be if data were checked by the browser and any error messages originated locally?

Other Typical Uses of Web Page Dynamics

• Detecting which browser accesses page
• Customising HTML for browsers
• User Customised HTML
• Opening new browser windows for new links
• Messages and confirmations, Alerts, Status Bar
• Writing to Frames
• Rollover Buttons, Moving Images
• Multiple pages in a single Download
• ..... Many More