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is it possible to parse html pages using javascript??

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  is it possible to parse html pages using javascript?? Gaurav vinayak <vinayakgaurav198@gmail.com> - 2012-06-20 01:55 -0700
    Re: is it possible to parse html pages using javascript?? Martin Honnen <mahotrash@yahoo.de> - 2012-06-20 12:41 +0200
    Re: is it possible to parse html pages using javascript?? Arno Welzel <usenet@arnowelzel.de> - 2012-06-27 17:25 +0200
      Re: is it possible to parse html pages using javascript?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-06-27 21:05 +0000
        Re: is it possible to parse html pages using javascript?? Arno Welzel <usenet@arnowelzel.de> - 2012-07-09 19:56 +0200
          Re: is it possible to parse html pages using javascript?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-07-09 18:51 +0000
    Re: is it possible to parse html pages using javascript?? Dr J R Stockton <reply1228@merlyn.demon.co.uk.not.invalid> - 2012-07-11 21:03 +0100

#14584 — is it possible to parse html pages using javascript??

is it possible to parse html pages using javascript??

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#14586

Gaurav vinayak wrote:
> is it possible to parse html pages using javascript??

Recent versions of Firefox/Mozilla support that e.g.

var html =
'<html><body><p>Paragraph 1.<p id=p2>Paragraph 2</body></html>';
var htmlDoc = new DOMParser().parseFromString(html, 'text/html');
alert(htmlDoc.getElementById('p2').textContent);

XMLHttpRequest in recent Firefox/Mozilla (as well as Chrome I think) 
also support parsing text/html documents with XMLHttpRequest e.g.

var req = new XMLHttpRequest();
req.open('GET', 'foo.html');
req.responseType = 'document';
req.onload = function() {
   alert(req.responseXML.body.innerHTML);
};
req.send();


-- 

	Martin Honnen --- MVP Data Platform Development
	http://msmvps.com/blogs/martin_honnen/

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#14710

Gaurav vinayak, 20.06.2012 10:55:

> is it possible to parse html pages using javascript??

What do you mean with "parse"? Do you know the DOM?



-- 
Arno Welzel
http://arnowelzel.de
http://de-rec-fahrrad.de

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#14722

Arno Welzel wrote on 27 jun 2012 in comp.lang.javascript:

> Gaurav vinayak, 20.06.2012 10:55:
> 
>> is it possible to parse html pages using javascript??
> 
> What do you mean with "parse"? Do you know the DOM?

You could parse a html-file as a textfile 
using either serverside or clientside javascript.

--  
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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#14971

Evertjan., 27.06.2012 23:05:

> Arno Welzel wrote on 27 jun 2012 in comp.lang.javascript:
> 
>> Gaurav vinayak, 20.06.2012 10:55:
>>
>>> is it possible to parse html pages using javascript??
>>
>> What do you mean with "parse"? Do you know the DOM?
> 
> You could parse a html-file as a textfile 
> using either serverside or clientside javascript.

Usually nobody uses JavaScript to "parse" HTML - you use the DOM, which
means, the HTML is already parsed and accessible using methods like
getElementById() etc..


-- 
Arno Welzel
http://arnowelzel.de
http://de-rec-fahrrad.de

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#14976

Arno Welzel wrote on 09 jul 2012 in comp.lang.javascript:

> Evertjan., 27.06.2012 23:05:
> 
>> Arno Welzel wrote on 27 jun 2012 in comp.lang.javascript:
>> 
>>> Gaurav vinayak, 20.06.2012 10:55:
>>>
>>>> is it possible to parse html pages using javascript??
>>>
>>> What do you mean with "parse"? Do you know the DOM?
>> 
>> You could parse a html-file as a textfile 
>> using either serverside or clientside javascript.
> 
> Usually nobody uses JavaScript to "parse" HTML - you use the DOM, which
> means, the HTML is already parsed and accessible using methods like
> getElementById() etc..

While I doubt that you could determine what usually nobody does,
as there would be nothing usual about things that nobody does,
still it was the OQ of Gaurav, the OP, how to parse html pages using 
javascript.

Inspecting the DOM would not quit qualify, would it, as inspecting the DOM 
could not be called parsing, could it?

btw, Arno,

If I wanted to parse an html-page downloaded to my server to extract 
relevant date with serverside javascript, as I and other of your nobodies a 
matter of fact sometimes do, there would be no DOM available, while as 
serverside javascript has some very nice and concise regex accessability 
methods not so easily accessable using other serverside scripting 
languages, like PHP or VBS. 


-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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#15021

In comp.lang.javascript message <88af4dff-5cd2-4119-b5ab-2163ee57e864@vs
10g2000pbc.googlegroups.com>, Wed, 20 Jun 2012 01:55:39, Gaurav vinayak
<vinayakgaurav198@gmail.com> posted:

>is it possible to parse html pages using javascript??

Yes, if you present the HTML page as a string.

Proof : One can write a Turing Machine in JavaScript.  A Turing Machine
can do anything computable.  Parsing HTML pages is computable.  QED.

In practice, one can optimise that considerably.

However, the task of properly parsing HTML by using JavaScript is
probably beyond the ability of anyone who needs to ask your question.

See <http://wsh2.uw.hu/index.html>, for instance, about JScript; and
look up HTA pages.

-- 
 (c) John Stockton, nr London UK  ?@merlyn.demon.co.uk  IE8 FF8 Op11 Sf5 Cr15
   news:comp.lang.javascript FAQ <http://www.jibbering.com/faq/index.html>.
   <http://www.merlyn.demon.co.uk/js-index.htm> jscr maths, dates, sources.
   <http://www.merlyn.demon.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.

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