Technologies Beyond Html
Technologies Beyond Html
Web pages can incorporate technologies into HTML to enable and enhance the Internet experience beyond the mere presentation capabilities provided by HTML. By itself, HTML is useful in formatting static web documents for online presentation. Now that the Internet has developed into a tool for entertainment, news, and commerce, HTMLs mere web static presentation capabilities are insufficient. Web developers now employ technologies that integrate dynamic content, visitor tracking, and interactivity into web sites. These technologies include programming languages like Java and JavaScript, multimedia players for video and music, and cookies to remember information about web visitors.
The commerce and communication aspects of the Internet, call for the ability to enhance presentation and content dynamically. When communicating information or news it is important to get and keep audience attention. Active and attractive content addresses this truism. Additionally, all commerce requires interaction or exchange between entities; merchant and customer, supplier and distributor, publisher and subscriber, and so forth. For web pages to be tools of commerce, they must provide some interactivity. Building dynamism and interactivity into a web site requires adding means to detect and react to both internal and external web page events. The “means” used for detecting and reacting in HTML is one or more programs embedded in or called from the HTML code.
Customizing the detection and reaction to events usually requires programming. It follows that programming requires a programming language. In web page programming, two of the most popular and enduring of these programming languages are Java and JavaScript. Despite trivial similarities in name and syntax, these languages are very different. Tables 1 through 3 below explore the similarities and differences between these two languages. Note: The contents of the three tables below are based on numerous sources; however, the table structure, elements, and some contents are paraphrased from Woodger Computings Java vs. JavaScript webpage (January, 2008).
Java versus JavaScript: General Items
JavaScript
Java
Implementation
Code text interpreted by browser at runtime, then executed. Code cannot stand-alone.
Code compiled into machine-independent intermediate byte-code. The platform running the code uses machine-specific Java Virtual Machine (JVM) to interpret the byte-code and run it.
Dependency
JavaScript is browser dependant, rather than platform dependant, since the browser interprets and executes the code.
Java applets (mini-applications) run within browsers that support them. The platform running the browser must have JVM installed.
Minimum Development Environment
JavaScript code can be developed using an ordinary text editor. Testing requires running the code with a browser.
Java requires a Java Developer Kit (JDK) develop Java code. The JDK includes a compiler, a debugger and an applet viewer.
Language Philosophy
A loosely typed scripting language aimed at web designers and developers – rather than software developers.
JavaScript tries to continue running unless it encounters an insurmountable syntax error.
A more rigorous language, Javas compiler works at preventing runtime issues before any questionable or dangerous actions take place.
Learning Curve
JavaScript is a smaller and more straightforward to learn.
Java is larger and more complex language. It requires more programming skill.
Table 1: Java vs. JavaScript, General Items. Woodger Computing Inc. (2008, January)
Java versus JavaScript: Presentation Features
JavaScript
Java
Web Presentation Ability
JavaScript can build dynamic web pages.
JavaScript provides more direct control over the browser. (e.g. controlling the back button, refreshing the page, etc.)
Java had dynamic capabilities much earlier that HTML/JavaScript but the gap has been greatly narrowed.
Only Java can be used for live streaming of data (e.g. stock-market tickers).
Web Presence
The relative predominance of HTML/JavaScript on the web can probably be attributed to easier GUI development and faster webpage downloading times.
Many Java applets are found on the web.
Developing User Interfaces
User Interfaces are developed in HTML. JavaScript is included in the webpage and it interacts with the HTML form elements.
Tools exist to make developing web pages (HTML and JavaScript) much easier.
In plain Java, user interfaces are developed in AWT or Swing. Working directly with these Java libraries