DOCTYPE detector - Javascript

Jim Michaels

I can't get any "universal" code working that tries to detect whether the
document it's in is xhtml or html.
I found this, which tells me I have a hill to climb with no equipment.
http://javascript.about.com/library/bliebug.htm

I was going to use the document.doctyp e property if I could, but apparently
that isn't available unless I use strict. (just tried it with Strict, still
doesn't do anything).

here's what I've got. anybody got ideas that work or some pointers? I
don't have any money for books right now, and I wouldn't know which of 100's
of JS books to pick from.

I am using IE6, but I want this to be cross-browser.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dt d">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitl ed Document</title>
</head>

<body>
<script language="JavaS cript" type="text/javascript">
//document.getEle mentsByTagName( '!DOCTYPE') generates an "object", but what
type? element? if so, why won't element properties work?
document.write( document.doctyp e); //prints nothing
document.write( document.getEle mentsByTagName( 'html').getAttr ibute("xmlns")) ;
//prints nothing
document.write( document.getEle mentsByTagName( '!DOCTYPE').has Attribute("-//W3C//DTD
XHTML 1.0 Transitional//EN")); //prints nothing
//if (document.getEl ementsByName('! DOCTYPE') != null ||
document.getEle mentsByName('ht ml').getAttribu te('xmlns') != null) {
// document.write( document.getEle mentsByName('ht ml').innerHTML) ;
//}
</script>

</body>
</html>

I'm really frustrated. I lack info.

Jim Michaels

Aug 5 '06 #1

Subscribe Reply

9158

darwinist

Jim Michaels wrote:

I can't get any "universal" code working that tries to detect whether the
document it's in is xhtml or html.
I found this, which tells me I have a hill to climb with no equipment.
http://javascript.about.com/library/bliebug.htm

I was going to use the document.doctyp e property if I could, but apparently
that isn't available unless I use strict. (just tried it with Strict, still
doesn't do anything).

here's what I've got. anybody got ideas that work or some pointers? I
don't have any money for books right now, and I wouldn't know which of 100's
of JS books to pick from.

I am using IE6, but I want this to be cross-browser.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dt d">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitl ed Document</title>
</head>

<body>
<script language="JavaS cript" type="text/javascript">
//document.getEle mentsByTagName( '!DOCTYPE') generates an "object", but what
type? element? if so, why won't element properties work?
document.write( document.doctyp e); //prints nothing
document.write( document.getEle mentsByTagName( 'html').getAttr ibute("xmlns")) ;
//prints nothing
document.write( document.getEle mentsByTagName( '!DOCTYPE').has Attribute("-//W3C//DTD
XHTML 1.0 Transitional//EN")); //prints nothing
//if (document.getEl ementsByName('! DOCTYPE') != null ||
document.getEle mentsByName('ht ml').getAttribu te('xmlns') != null) {
// document.write( document.getEle mentsByName('ht ml').innerHTML) ;
//}
</script>

</body>
</html>

I'm really frustrated. I lack info.

Why do you need to know it, first of all?

Jim Michaels

Aug 5 '06 #2

Jim Michaels

Jim Michaels wrote:

>I can't get any "universal" code working that tries to detect whether the
document it's in is xhtml or html.

Why do you need to know it, first of all?

because generated singleton elements are different, such as <bror <br />
depending on whether it's html or xhtml.

Aug 5 '06 #3

darwinist

Jim Michaels wrote:

Jim Michaels wrote:
I can't get any "universal" code working that tries to detect whether the
document it's in is xhtml or html.

Why do you need to know it, first of all?

because generated singleton elements are different, such as <bror <br />
depending on whether it's html or xhtml.

What are you trying to do with them? Can you use the same javascript
calls to make, get or manipulate them, regardless of the format of the
text? I'm not very familiar with xhtml I'm just thinking if it's so
hard it might not be necessary.

Aug 5 '06 #4

Randy Webb

Jim Michaels said the following on 8/5/2006 1:41 AM:

>Jim Michaels wrote:
>>I can't get any "universal" code working that tries to detect whether the
document it's in is xhtml or html.

>Why do you need to know it, first of all?

because generated singleton elements are different, such as <bror <br />
depending on whether it's html or xhtml.

With IE, it's irrelevant as IE doesn't support - in any form - XHTML so
feeding it <br /leads to tag soup parsing.

--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

Aug 5 '06 #5

Jim Michaels

"darwinist" <da*******@gmai l.comwrote in message
news:11******** **************@ m73g2000cwd.goo glegroups.com.. .

Jim Michaels wrote:

Jim Michaels wrote:
I can't get any "universal" code working that tries to detect whether
the
document it's in is xhtml or html.

Why do you need to know it, first of all?

because generated singleton elements are different, such as <bror <br
/>
depending on whether it's html or xhtml.

I forgot to mention that all the calls I made do not work (and should
theoretically work)
really what I am building is an xhtml document detector (true/false).

What are you trying to do with them? Can you use the same javascript
calls to make, get or manipulate them, regardless of the format of the
text? I'm not very familiar with xhtml I'm just thinking if it's so
hard it might not be necessary.

real simple. things like:
if (isXhtml) {document.write ('<br />');} else {document.write ('<br>');}

xhtml affects things like singleton elements/tags like <brwhich become <br
/and <input ...which becomes <input ... />
it also forces element and attribute names to be lower case.

....I tried what you suggested, but got nowhere. that's why I am looking for
outside help. Apparently MSIE exposes other properties and methods for
Document object, and other related objects like Element, my two toughies.
methods/properties that are not exposed if you specify a Strict !DOCTYPE and
are used by a number of slightly older browsers.

Aug 5 '06 #6

gonaumov

Hi mr Michaels.
Only for fun i wrote this code. I tried it under Mozilla Firefox,
Opera 9.0 and
Internet Explorer 6.0. If there is a doctype in the document the
function detectDoctype() will return
object with 3 properties - xhtml - XHTML ot HTML , version - numer of
version and importance - stict, transitional etc. If there is no
DOCTYPE it will return null.
Best Regards.
/*************** ***************
Version info "object"
*************** ***************/
function versionInfo()
{
this.xhtml="";
this.version="" ;
this.importance ="";
}
function detectDoctype() {
var re=/\s+(X?HTML)\s+([\d\.]+)\s*([^\/]+)*\//gi;
var myversionInfo=n ew versionInfo();
/*************** *************** ***************
Just check for internet explorer.
*************** *************** *************** */
if(typeof document.namesp aces != "undefined" ){
if(document.all[0].nodeType==8)
re.exec(documen t.all[0].nodeValue);
else
return null;
}else{
if(document.doc type != null)
re.exec(documen t.doctype.publi cId);
else
return null;
}
myversionInfo.x html=RegExp.$1;
myversionInfo.v ersion=RegExp.$ 2;
myversionInfo.i mportance=RegEx p.$3;
return myversionInfo;
}
var myversionInfo=d etectDoctype();
if(myversionInf o != null){
alert(myversion Info.xhtml);
alert(myversion Info.version);
alert(myversion Info.importance );
}
else{
alert("There is no DOCTYPE in the code!");
}

Jim Michaels Ð½Ð°Ð¿Ð¸ÑÐ°:

I can't get any "universal" code working that tries to detect whether the
document it's in is xhtml or html.
I found this, which tells me I have a hill to climb with no equipment.
http://javascript.about.com/library/bliebug.htm

I was going to use the document.doctyp e property if I could, but apparently
that isn't available unless I use strict. (just tried it with Strict, still
doesn't do anything).

here's what I've got. anybody got ideas that work or some pointers? I
don't have any money for books right now, and I wouldn't know which of 100's
of JS books to pick from.

I am using IE6, but I want this to be cross-browser.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dt d">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitl ed Document</title>
</head>

<body>
<script language="JavaS cript" type="text/javascript">
//document.getEle mentsByTagName( '!DOCTYPE') generates an "object", but what
type? element? if so, why won't element properties work?
document.write( document.doctyp e); //prints nothing
document.write( document.getEle mentsByTagName( 'html').getAttr ibute("xmlns")) ;
//prints nothing
document.write( document.getEle mentsByTagName( '!DOCTYPE').has Attribute("-//W3C//DTD
XHTML 1.0 Transitional//EN")); //prints nothing
//if (document.getEl ementsByName('! DOCTYPE') != null ||
document.getEle mentsByName('ht ml').getAttribu te('xmlns') != null) {
// document.write( document.getEle mentsByName('ht ml').innerHTML) ;
//}
</script>

</body>
</html>

I'm really frustrated. I lack info.

Jim Michaels

Aug 5 '06 #7

Eric Bohlman

"Jim Michaels" <NO************ ***@yahoo.comwr ote in
news:bO******** *************** *******@comcast .com:

real simple. things like:
if (isXhtml) {document.write ('<br />');} else
{document.write ('<br>');}

xhtml affects things like singleton elements/tags like <brwhich
become <br /and <input ...which becomes <input ... />
it also forces element and attribute names to be lower case.

Why not just use DOM methods to create *elements*, rather than writing
*tags* and making the browser's HTML parser do the work of turning them
into elements? That way you don't need to know/care how the tags were
written.

Aug 5 '06 #8

Martin Honnen

Jim Michaels wrote:

"darwinist" <da*******@gmai l.comwrote in message

>>What are you trying to do with them? Can you use the same javascript
calls to make, get or manipulate them, regardless of the format of the
text? I'm not very familiar with xhtml I'm just thinking if it's so
hard it might not be necessary.

real simple. things like:
if (isXhtml) {document.write ('<br />');} else {document.write ('<br>');}

xhtml affects things like singleton elements/tags like <brwhich become <br
/and <input ...which becomes <input ... />
it also forces element and attribute names to be lower case.

You are making your life more complicated than it is. If you serve your
documents as text/html then the browser uses its HTML tag soup parser
and not XML parser and you can do all document.write( '<br>') as much as
you like. If you served your documents as application/xhtml+xml to have
them parsed by an XML parser then IE would not render them at all and
Mozilla or Opera would not support document.write at all.
Thus as long as you want to use document.write your are in an
environment where HTML rules rule and there is no need to discover any
DOCTYPE or parsing mode.
--

Martin Honnen
http://JavaScript.FAQTs.com/

Aug 5 '06 #9

gonaumov

I thing in this way the code is much better and short.
function detectDoctype() {
var re=/\s+(X?HTML)\s+([\d\.]+)\s*([^\/]+)*\//gi;
var res=false;
/*************** *************** ***************
Just check for internet explorer.
*************** *************** *************** */
if(typeof document.namesp aces != "undefined" )
res=document.al l[0].nodeType==8 ?
re.test(documen t.all[0].nodeValue) : false;
else
res=document.do ctype != null ?
re.test(documen t.doctype.publi cId) : false;
if(res){
res=new Object();
res['xhtml']=RegExp.$1;
res['version']=RegExp.$2;
res['importance']=RegExp.$3;
return res;
}else{
return null;
}
}
var myversionInfo=d etectDoctype();
if(myversionInf o != null){
alert(myversion Info.xhtml);
alert(myversion Info.version);
alert(myversion Info.importance );
}
else{
alert("There is no DOCTYPE in the code!");
}
go******@gmail. com Ð½Ð°Ð¿Ð¸ÑÐ°:

Hi mr Michaels.
Only for fun i wrote this code. I tried it under Mozilla Firefox,
Opera 9.0 and
Internet Explorer 6.0. If there is a doctype in the document the
function detectDoctype() will return
object with 3 properties - xhtml - XHTML ot HTML , version - numer of
version and importance - stict, transitional etc. If there is no
DOCTYPE it will return null.
Best Regards.
/*************** ***************
Version info "object"
*************** ***************/
function versionInfo()
{
this.xhtml="";
this.version="" ;
this.importance ="";
}
function detectDoctype() {
var re=/\s+(X?HTML)\s+([\d\.]+)\s*([^\/]+)*\//gi;
var myversionInfo=n ew versionInfo();
/*************** *************** ***************
Just check for internet explorer.
*************** *************** *************** */
if(typeof document.namesp aces != "undefined" ){
if(document.all[0].nodeType==8)
re.exec(documen t.all[0].nodeValue);
else
return null;
}else{
if(document.doc type != null)
re.exec(documen t.doctype.publi cId);
else
return null;
}
myversionInfo.x html=RegExp.$1;
myversionInfo.v ersion=RegExp.$ 2;
myversionInfo.i mportance=RegEx p.$3;
return myversionInfo;
}
var myversionInfo=d etectDoctype();
if(myversionInf o != null){
alert(myversion Info.xhtml);
alert(myversion Info.version);
alert(myversion Info.importance );
}
else{
alert("There is no DOCTYPE in the code!");
}

Jim Michaels Ð½Ð°Ð¿Ð¸ÑÐ°:
I can't get any "universal" code working that tries to detect whether the
document it's in is xhtml or html.
I found this, which tells me I have a hill to climb with no equipment.
http://javascript.about.com/library/bliebug.htm

I was going to use the document.doctyp e property if I could, but apparently
that isn't available unless I use strict. (just tried it with Strict, still
doesn't do anything).

here's what I've got. anybody got ideas that work or some pointers? I
don't have any money for books right now, and I wouldn't know which of 100's
of JS books to pick from.

I am using IE6, but I want this to be cross-browser.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dt d">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitl ed Document</title>
</head>

<body>
<script language="JavaS cript" type="text/javascript">
//document.getEle mentsByTagName( '!DOCTYPE') generates an "object", but what
type? element? if so, why won't element properties work?
document.write( document.doctyp e); //prints nothing
document.write( document.getEle mentsByTagName( 'html').getAttr ibute("xmlns")) ;
//prints nothing
document.write( document.getEle mentsByTagName( '!DOCTYPE').has Attribute("-//W3C//DTD
XHTML 1.0 Transitional//EN")); //prints nothing
//if (document.getEl ementsByName('! DOCTYPE') != null ||
document.getEle mentsByName('ht ml').getAttribu te('xmlns') != null) {
// document.write( document.getEle mentsByName('ht ml').innerHTML) ;
//}
</script>

</body>
</html>

I'm really frustrated. I lack info.

Jim Michaels

Aug 5 '06 #10

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