Calling JS function from within iframe tag - Page 2

ukrbend

I'm new to Javascript and to html and am trying to make the following
code snippet work but it doesn't. It refuses to call the getPage()
function and I always get a 404 error. I know the code is getting as
far as the iframe section as other parts of the html code work
correctly. But
it is not executing any code within the getPage() function as some
"hello world" writes within getPage() wouldn't print.

-----------------------------------------------------------------------------------
..
..
..

<script language="javas cript" type="text/javascript">

function getPage() {

}
</script>
</head>

<body>
<iframe src="getPage()" name="whatever" width=100% height=600
frameborder="0" scrolling="yes" > </iframe>
..
..
..
-------------------------------------------------------------------------------

Can anyone help what the syntax error is here, or what I am trying
to do is not possible? Thanks and please no flames.

Dec 2 '05

Subscribe Reply

6714

Thomas 'PointedEars' Lahn

web.dev wrote:

Secondly, I do agree with you. Perhaps what I said was a little harsh.
It's not erroneous, however it is inefficient for you to place html
comment tags there. [...]

<script type = "text/javascript">

</script>

It is hardly inefficient (9 bytes more or less hardly count), but it is
erroneous, at least error-prone. It is assuming that either markup parsers
are broken, not considering the content of the `script' element to be CDATA
(in HTML) or PCDATA (in XHTML), or that script engines are broken, ignoring
the operators `<', `!', and `--' if they are used in the first line of
source code and/or in that order without whitespace between them.
PointedEars

Dec 3 '05 #11

Thomas 'PointedEars' Lahn

ukrbend wrote:

Here's another solution, better?

<script>
var pageURL = getPage();
document.write( "<iframe src=\"",pageURL ,"\""," width=100%
height=600 frameborder=\"0 \" scrolling=\"yes \"> ","</iframe>");
</script>

No. In what way do you consider that to be better than RobG's suggestion?
The above is not even Valid HTML.
PointedEars

Dec 3 '05 #12

Thomas 'PointedEars' Lahn

RobG wrote:

VK wrote:
RobG wrote:
One technique is to write the iframe tag using script, so scriptless
browsers will not see the iframe element at all, e.g.

<script type="text/javascript">
document.write(
'<iframe src="somepage.h tml" name="whatever" width="100%"',
' height=600 frameborder="0" scrolling="yes" ><\/iframe>'
);
</script>

For what it worth to mention Netscape 4.x had (has) "JavaScript
entities" one could use for attribute values. Sometimes I'm wondering
why this very useful shortcut for document.write did not go...

I don't see much point in referring to proprietary extensions in dead
browsers.

IBTD. Netscape 4.x is very much alive, and Netscape 4.8 (1998) is quite
stable. Development and support has discontinued, but it is still used
on a considerable number of computers. For example, it is on machines
of universities' computer centers (although Mozilla Suite and Firefox
are winning bits every nanosecond :)), and some private users prefer slim
Netscape 4 Communicator instead of Firefox and Thunderbird or Mozilla
Suite.
Regardless, the advice would have been the same: depending on
script support to provide essential information for the tag to
be useful is a bad idea.

If Netscape 4.x did not have the Run-Length bug (I have not yet tested if it
is still in 4.8 which was considered a bugfix release of 4.79), client-side
scripting would indeed turn out to be useful here as NN4 does not support
the `iframe' element (that goes for my NN4.8/Linux as well), it supports
`<ilayer>...</ilayer>' IIRC.
PointedEars

Dec 3 '05 #13

RobG

ukrbend wrote:

Here's another solution, better?

<script>
The type attribute is required:

<script type="text/javascript">

var pageURL = getPage();
For truly robust code, a check should be made to ensure that getPage()
was available and actually returned something useful:

e.g.
var pageURL
if ( 'function' == typeof getPage
&& (pageURL = getPage()) // Note assignment '='
&& 'string' == typeof pageURL )
{
// use pageURL
}

document.write( "<iframe src=\"",pageURL ,"\""," width=100%

For typical use, the extra global variable can be removed and the test
simplified provided it is tested thoroughly:

if( 'function' == typeof getPage ){
document.write( '<iframe src="' + getPage() + '"'
+ ...
}

Attribute values should always be quoted (as advised previously):

"By default, SGML requires that all attribute values be delimited
using either double quotation marks (ASCII decimal 34) or single
quotation marks (ASCII decimal 39)...

"In certain cases [in HTML], authors may specify the value of an
attribute without any quotation marks. The attribute value may only
contain letters (a-z and A-Z), digits (0-9), hyphens (ASCII decimal
45), periods (ASCII decimal 46), underscores (ASCII decimal 95), and
colons (ASCII decimal 58). We recommend using quotation marks even
when it is possible to eliminate them."

<URL: http://www.w3.org/TR/html401/intro/sgmltut.html#h-3.2.2 >

An attribute value that has a percentage character '%' *must* be quoted.

I prefer to use double quotes inside single quotes rather than escaping
double inside double:

<script type="text/javascript">
if ( 'function' == typeof getPage ) {
document.write(
'<iframe src="' + getPage() + '"'
+ ' name="whatever" width="100%" height="600"'
+ ' frameborder="0" scrolling="yes" > </iframe>'
);
}
</script>
--
Rob

Dec 3 '05 #14

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