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Internet Applications

Internet Applications. Notes for Chapter 19 Digital Domain, 2 ed. E-Commerce. E-Commerce is rapidly emerging as an essential business strategy E-Commerce has the following components Web interface on the client side backend databases on the server side

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Internet Applications

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  1. Internet Applications Notes for Chapter 19 Digital Domain, 2 ed

  2. E-Commerce • E-Commerce is rapidly emerging as an essential business strategy • E-Commerce has the following components • Web interface on the client side • backend databases on the server side • scripts to enable the interaction of these two

  3. Client-Side Scripting in E-Commerce • Resides on the client machine (downloaded with the Web interface) • Creates client interactivity • Collects data from the user • Does preliminary analysis and validation on user-supplied data • Sends validated data to the server

  4. Server-Side Scripting in E-Commerce • Resides on the server • Accepts data from the client • Uses that data to • search backend databases • write to databases • initiate credit card processes, etc. • Returns response data to the client

  5. Client-Side Processing and DHTML • Dynamic HTML (DHTML) is • a collection of technologies to make client-side interactions better and more interactive • is a bit of a misnomer – it is not an extension of HTML • DHTML is not standardized • different browser companies compete with their own DHTML features • as long as the “browser wars” persist, DHTML is unlikely to be standardized • Two important components of DHTML • CSS (cascading style sheets) • client-side scripting

  6. Cascading Style Sheets (CSS) • Define styles for formatting and displaying information • provides for better Web site internal consistency • makes Web site style modifications much easier • Three types of CSS • inline • embedded • external • applied with precedence: inline->embedded->external

  7. Client-Side Scripting and Forms • Scripting works hand-in-hand with HTML forms • HTML forms have built-in mechanisms for soliciting and collecting user data • Forms are a part of standard HTML • Client-side scripts are used to take action on the data collected before sending it to the server • Such scripts are invoked using the onSubmit event handler

  8. Server-Side Scripting • Accepts data from client • Often written in • CGI (Common Gateway Interface) • actually an interface rather than a scripting language • can be written in a number of different scripting languages • PHP: HyperText Preprocessor • ASP (Active Server Pages – Microsoft)

  9. Java Programming • Java is an object-oriented full-purpose (as opposed to scripting only) programming language • Java is noted for its excellent cross-platform capability • accomplished by first compiling into bytecodes • bytecodes are machine-independent • a given machine’s Java RTE (Runtime Environment) then interprets the bytecodes into the appropriate machine language at run-time • Java applets are small Java programs designed specially for the Web

  10. XML (eXtensible Markup Language) • XML is a very flexible language designed to facilitate exchange of information across the Web • It is actually a meta-language that allows the creation of domain specific markup languages • HTML is but one example of a language that could be created with XML • Languages especially designed for the exchange of financial information, medical information, graphical information, and mathematics are other examples of existing XML specifications

  11. Summary • E-Commerce is rapidly emerging as an essential business strategy • E-Commerce has the following components • Web interface on the client side • backend databases on the server side • scripts to enable the interaction of these two • Client-side scripts • create client interactivity • collect data from the user • send data to the server • Server-side scripts • accept data from the client • use that data to access backend databases or other server resources • return response data to the client

  12. Summary (cont’d) • Dynamic HTML (DHTML) is • a collection of technologies to improve client-side interactivity and Web site usability • two important components of DHTML • CSS (cascading style sheets) • client-side scripting • scripting works hand-in-hand with HTML forms • Java is an object-oriented full-purpose (as opposed to scripting only) programming language • Java applets are small Java programs designed specially for the Web

  13. Summary (cont’d) • XML is a meta-language that allows the creation of domain specific markup languages • It is designed to facilitate exchange of information across the Web

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