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Client-side and Server-side JavaScript


This article explains the three major types of JavaScript, client-side, server-side and the core language. Server-side JavaScript is ideal for creating web applications that can be run on any platform, on any browser, and in any language. See the article for other advantages and disadvantages of each.

Author Info:
By: Ibama Supreme Tmunotein
Rating: 4 stars4 stars4 stars4 stars4 stars / 121
October 20, 2004
TABLE OF CONTENTS:
  1. · Client-side and Server-side JavaScript
  2. · Core JavaScript
  3. · Client-Side and Server-Side JavaScript
  4. · CSJS vs. SSJS
  5. · SSJS VS. CGI
  6. · SSJS

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Client-side and Server-side JavaScript - CSJS vs. SSJS
(Page 4 of 6 )

The table below compares CSJS and SSJS. Note that the only syntactical difference between CSJS code and SSJS code is that for CSJS you use a <SCRIPT> tag rather than a <SERVER> tag in your HTML document. Remember, however, that SSJS provides a different set of objects from CSJS -- if you try to use CSJS objects in your server application, errors will result. Note that CSJS can be served by any server but only displayed by JavaScript-enabled browsers. SSJS must be served by a JavaScript-enabled server but can be displayed by any browser.

 

CSJS

SSJS

Tags

<SCRIPT>

<SERVER>

Execution

Client browser (interpreted)

Server (compiled into SSJS byte code)

Compilation

Not compiled

Application file (.web)

Client

JavaScript-enabled

Any browser

Server

Any server

JavaScript-enabled

You've probably heard the terms Livewire and server-side JavaScript used interchangeably, but they're two distinctly different technologies. When Livewire was released as a product by Netscape in 1996, it contained site management utilities and provided database connectivity via SSJS on Netscape Enterprise Server 2.0. In 1997, Livewire was included with Enterprise Server 3.0, so it's no longer a separate product. Netscape began to refer to the database access engine itself as Livewire and to distinguish it from the language that the database applications are written in, SSJS.

The diagram below shows how SSJS interacts with LiveWire to connect with a variety of databases (DB2, Informix, Oracle, Sybase, and ODBC-compliant databases). SSJS provides developers with a collection of objects (such as the database, DbPool, and cursor objects) that interact with the LiveWire database access engine to communicate with a database. At the same time, some of the objects that are part of SSJS (the file, SendMail, and state management objects) do not interact with LiveWire. Remember that LiveWire involves database access only, whereas SSJS encompasses database access and additional server-side functionality.

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