September 2001
Intermediate to advanced
640 pages
31h 42m
English
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JavaScript Basics
JavaScript code is usually placed directly in an HTML document. The code can go in either the head or the body, and there can be numerous scripts in a single HTML document. Here’s the syntax:
<SCRIPT LANGUAGE="JavaScript"> <!-- script goes here //--> </SCRIPT>
The <script> tags define the boundaries of
the script and set the scripting language to JavaScript. The
language attribute is necessary to distinguish
JavaScript from other scripting languages, like VBScript, that can
also be embedded in web pages. Finally, HTML comments surround the
script to hide the code from really old browsers that don’t
understand the <script> tag. Otherwise,
those browsers would just display the code like preformatted text,
which isn’t very pretty.
Functions
There are two parts to most JavaScript applications: the functions that tell the browser what to do, and actual uses of these functions. Let’s take the example of a simple web page that displays a linked document in a second window:
<HTML>
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!--
function openWin(URL) {
aWindow = window.open(URL,"composerwindow","toolbar=no,width=350,
height=400,status=no,scrollbars=yes,resize=no,menubar=no");
}
//-->
</SCRIPT>
</HEAD>
<BODY>
<P><A HREF="javascript:openWin('mozart.html');">Mozart</A></P>
<P><A HREF="javascript:openWin('beethoven.html');">Beethoven</A></P>
<P><A HREF="javascript:openWin('wagner.html');">Wagner</A></P>
</BODY>
</HTML>The JavaScript inside the
<script>
tags defines a function, called ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.