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Re: Null values changed to "value"?

From: Randy Waki <rwaki@flipdog.com>
Date: Thu, 8 Feb 2001 16:31:26 -0500
Message-ID: <002101c09216$89a6ce00$c89356cf@whizbang.com>
To: "Russell Gold" <russgold@acm.org>, "Gary L Peskin" <garyp@firstech.com>
Cc: <html-tidy@w3.org>
Gary L Peskin wrote:
> 
> Russell Gold wrote:
> > 
> > As of R6, I notice that the tag:
> > 
> > <input type=string name=something value=>
> > 
> > is now treated as though it said:
> > 
> > <input type=string name=something value="value">
> > 
> > which seems odd, to say the least. Is this related to the "bug-fix" described as
> > "Fixed a bug where createElement() was not properly setting Node.tag if the tag to be added could not be found in the the
> > TagTable. A generic entry is now used instead of leaving the entry set to null."?
> > 
> > I would have thought that treating it as an empty string
> > 
> > <input type=string name=something value="">
> > 
> > would have been a safer choice.
> 
> This should not have changed from that bug fix since "input" should have
> been found in TagTable all along.  Can you provide the actual HTML page
> along with your configuration file or command line options and I'll try
> to reproduce the problem.

I think Russell must be using -asxml.  I've reproduced this in both
JTidy and the official 4-Aug-2000 Tidy.  Problems occur with both input
and option elements.  Here's the test file:

<html>
<head><title>x</title></head>
<body>
 <form action="http://www.w3c.org/" method="get">
  <select name="option">
   <option value>option 1</option>       <!-- BAD VALUE -->
   <option value="opt2">option 2</option>
  </select>
  <input name="input" type="text" value>    <!-- BAD VALUE -->
  <input name="submit" type="submit" value="submit">
 </form>
</body>
</html>

Hitting the submit button in a browser produces the following URLs:

  IE 5.5:        http://www.w3.org/?option=option+1&input=&submit=submit
  Netscape 4.7:  http://www.w3.org/?option=&input=&submit=submit
  (these are the only browsers I have ready access to)

Tidy changes both of the valueless value attributes as follows:

  default options:  value=""
  -asxml:           value="value"

So with default options, Tidy appears to be correct (for <option value>,
Tidy has chosen to simulate Netscape's behavior).  However, with -asxml,
Tidy appears to be plain wrong.

One possible fix is to modify parseAttrs() in lexer.c to detect if the
attribute name is "value" and it has no value and its owning element is
either "option" or "input" (the owning element name would have to be
passed in as an additional argument).  When this condition occurs, Tidy
should set the value to "" or simply discard the attribute altogether.
I've taken the "discard" approach and applied it to our local copy of
JTidy, and it seems to work.

Randy
Received on Thursday, 8 February 2001 16:34:39 GMT

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