New to Javascript

J

JSNewbie

I am new to javascript. I used the code below in Netscape 7.0 and in
IE 6.0. The Javascript portion does not render in Netscape , but it
does show in IE. Can someone explain why? Any helpful insight would
be appreciated.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">
<html xmlins="http://www.w3.org/1999/xhtml">
<head>
<title>Java Script Test</title>
</head>
<body bgcolor="#FFFFF">
<h1> What is your problem
</h1>
<script language="javascript"
type="text javascript">
<!-- Hide script from old browsers

document.write("<h1> Today is </h1>")

// End hiding script from old broswers -->
</script>
</body>
</html>
 
E

Evertjan.

JSNewbie wrote on 29 mrt 2005 in comp.lang.javascript:
I am new to javascript. I used the code below in Netscape 7.0 and in
IE 6.0. The Javascript portion does not render in Netscape , but it
does show in IE. Can someone explain why? Any helpful insight would
be appreciated.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">
<html xmlins="http://www.w3.org/1999/xhtml">
<head>
<title>Java Script Test</title>
</head>
<body bgcolor="#FFFFF">
Click to expand...

Better [get ]use[d to] CSS
White is default anyway
<h1> What is your problem
</h1>
<script language="javascript"
Click to expand...

language="javascript" is depriciated, don't use
type="text javascript">
<!-- Hide script from old browsers
Click to expand...

<!-- is depriciated for this use for more than 5 years, don't use
document.write("<h1> Today is </h1>")
Click to expand...

no problemo!!!
// End hiding script from old broswers -->
Click to expand...

see above
</script>
</body>
</html>
Click to expand...

Probably javascript switched off in the N7 broswer(?)
 
I

Ivo

JSNewbie wrote
<body bgcolor="#FFFFF">
Click to expand...

Better [get ]use[d to] CSS
White is default anyway
Click to expand...

Not true. I know a machine where the default is gray, and another where the
default on white text on blue. So another tip: if specifying a
backgroundcolour, you should explicitly set the foreground too.
<!-- is depriciated for this use for more than 5 years, don't use
Click to expand...

That has been said before in this newsgroup, but I 'm wondering why even
sites like Google and Altavista still cloak comment their scripts like this.
 
L

Lasse Reichstein Nielsen

Evertjan. said:
JSNewbie wrote on 29 mrt 2005 in comp.lang.javascript:
Click to expand...
Should be:
<html xmlns="...
<head>
<title>Java Script Test</title>
</head>
<body bgcolor="#FFFFF">
Click to expand...

Better [get ]use[d to] CSS
White is default anyway
Click to expand...

Agree on using CSS. Using XHTML with old, deprecated presentational tags
is mixing styles. It won't lead to anything good.

White is not the default background (not even in IE). The default is
the operating system's default window background, which on my computer
is slightly yellow. If you mean white, do use it.

However, what is written is not white. It needs another "F" to become
"#FFFFFF".
language="javascript" is depriciated, don't use
Click to expand...

It's "deprecated", but it means almost the same :)

This should be
type="text/javascript">
I think this is what is causing your problem. So, in total:

<script type="text/javascript">

is the way to start a script tag.
<!-- is depriciated for this use for more than 5 years, don't use
Click to expand...

It's not deprecated as an HTML comment, but it is correct that it is
not needed inside a script element. The "old browsers" that it is
supposed to hide the script from were succeeded by the generation
of browsers starting with Netscape 2, around 1996.

/L
 
L

Lasse Reichstein Nielsen

[not use "<!-- hide from old browsers"]
That has been said before in this newsgroup, but I 'm wondering why even
sites like Google and Altavista still cloak comment their scripts like this.
Click to expand...

Because it's voodoo. You can add it, and it doesn't hurt you, so why
change anything that once worked.

The problem is that it can hurt you if you use XHTML. An XML processor
is free to remove comments before processing the rest, inside any
element, so it could remove your script contents.

Browsers probably won't do that, but if you use XHTML, it should be
because you expect to use other tools on it (browsers are fine with
HTML, IE doesn't even treat XHTML as XML, but only as malformed HTML).

Any browser that understands the script tag, even those that don't
understand its contents, will not need "<!--". That's pretty much any
browser since Netscape 2.

/L
 
E

Evertjan.

Lasse Reichstein Nielsen wrote on 29 mrt 2005 in comp.lang.javascript:
It's "deprecated", but it means almost the same :)
Click to expand...

Your correction is apprecated, I pray, Lasse!

===========

M-W:
Main Entry: dep·re·cate
Etymology: Latin deprecatus,
past participle of deprecari to avert by prayer,
from de- + precari to pray

Main Entry: ap·pre·ci·ate
Etymology: Late Latin appretiatus,
past participle of appretiare,
from Latin ad- + pretium price
 
J

John W. Kennedy

JSNewbie said:
I am new to javascript. I used the code below in Netscape 7.0 and in
IE 6.0. The Javascript portion does not render in Netscape , but it
does show in IE. Can someone explain why? Any helpful insight would
be appreciated.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">
<html xmlins="http://www.w3.org/1999/xhtml">
<head>
<title>Java Script Test</title>
</head>
<body bgcolor="#FFFFF">
<h1> What is your problem
</h1>
<script language="javascript"
type="text javascript">
<!-- Hide script from old browsers

document.write("<h1> Today is </h1>")

// End hiding script from old broswers -->
</script>
</body>
</html>
Click to expand...

The DOCTYPE is incomplete, and it should have "html" instead of "HTML".

The namespace property is spelled "xmlns", not "xmlins".

Forcing the body background color only is bad practice, because you
don't know what the user's default are. Either set all the colors or
leave them alone.

The "language" property of the "script" element is obsolete.

The MIME type for JavaScript is "text/javascript", not "text javascript".

Using <!-- ... --> is obsolete.

document.write does not work with XHTML (and isn't supposed to). Use the
DOM model.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Java Script Test</title>
</head>
<body>
<h1> What is your problem</h1>
<script type="text/javascript">
var body = document.getElementsByTagName("body")[0];
var h1 = document.createElement("h1");
h1.appendChild (document.createTextNode (" Today is "));
body.appendChild (h1);
</script>
</body>
</html>
 
M

Mick White

JSNewbie said:
I am new to javascript. I used the code below in Netscape 7.0 and in
IE 6.0. The Javascript portion does not render in Netscape , but it
does show in IE. Can someone explain why? Any helpful insight would
be appreciated.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">
<html xmlins="http://www.w3.org/1999/xhtml">
<head>
<title>Java Script Test</title>
</head>
<body bgcolor="#FFFFF">
Click to expand...

No such colour...
Mick
 

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