Page 17 - LoudOffice_Guide-to-HTML_Part-II_Advanced.PDF

Another attribute of the SCRIPT tag, s r c , can be used to include an external file containing
JavaScript code rather than code embedded into the HTML:
< s c r i p t l a n g u a g e = " J a v a S c r i p t " s r c = " c o r e f u n c t i o n s . j s " > < / s c r i p t >
The external file is simply a text file containing JavaScript code, and whose filename ends
with the extension ".js". Note that although some version 3 browsers support the SRC
attribute, it only functions reliably across platforms in version 4+ browsers.

Scripts can be placed inside comment fields to ensure that your JavaScript code is not
displayed by old browsers that do not recognize JavaScript. The markup to begin a
comment field is:

< ! - - / / H i d e
. . .
/ / U n h i d e - - >
Note that the double back-slash is special for JavaScript. This practice is optional, but
considered good form when your page is likely to be visited by older browsers. Certainly, as
older browsers fade away, or considered irrelevant in an intranet environment, this practice
may be increasingly unnecessary.

Naming Conventions
There are some rules and conventions you should follow when naming variables and
functions. You may use any combination of letters, numbers, and underscores (_). You
cannot begin with a number, and anything you name is case sensitive. Below are examples
of legal and illegal names:

LEGAL ILLEGAL
m y V a r i a b l e * m y _ v a r i a b l e
m y _ v a r i a b l e 2 m y v a r i a b l e
_ m y _ v a r i a b l e - m y V a r i a b l e
m y V a r i a b l e _ 2 _ m y v a r i a b l e

Reserved Words
There are a number of words you may not use within your script. The following terms are
reserved by JavaScript and may not be used by you in your scripts:

abstract else int switch
boolean extends interface synchronized
break false long this
byte final native throw
case finally new throws
catch float null transient
char for package true
class function private try
const goto protected typeof

LoudOffice.com Guide to HTML – Part II Page 17