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Re: How do I make JavaScript "pop-up help" accessible?

From: Charles McCathieNevile <charles@w3.org>
Date: Tue, 7 Nov 2000 07:15:12 -0500 (EST)
To: David Holstius <holstius@msu.edu>
cc: "Bailey, Bruce" <Bruce_Bailey@ed.gov>, w3c-wai-ig@w3.org
Message-ID: <Pine.LNX.4.21.0011070705340.16462-100000@tux.w3.org>
Well,

it provides a pop-up window, which goes against WCAG 1.0 checkpoint 10.1
(Priority 2) that says not to do that. But it does work for non-javascript
browsing, which is important.

Cheers

Charles McCN

On Mon, 6 Nov 2000, David Holstius wrote:

  Something that I've done in the past is to make a Javascript function that
  writes Javascript code into the document. I don't know how "official" this
  is, but it seems to work. Something like:
  
  function WritePopupHelp( helpFile, linkText ) {
      var s = '<a href="javascript:Help(\'' + helpFile + '\')">' + linkText +
  '</a>';
      document.write(s);
  }
  
  Combine it with a Help() function that you define, and then code your actual
  HTML like:
  
  <script type="text/javascript">WritePopupHelp('foobar.htm', 'Definition of
  foobar')</script>
  <noscript><a href="foobar.htm">Definition of foobar</a></noscript>
  
  That way, only users with JS enabled will get source that invokes JS.
  
  It becomes a little redundant to hand-code all those script/noscript pairs,
  so if you have the luxury of server-side processing you can wrap the
  generation of each script/noscript pair in a server-side function. (You
  wouldn't want to put it in another Javascript because then folks w/out JS
  wouldn't get *anything*.)
  
  I'd like to know what WAI-IG members think of this workaround.
  
  David Holstius
  holstius@msu.edu
  
  > On Monday, November 06, 2000 2:19 PM, Bruce Bailey wrote:
  >
  > I site I am reviewing generates context-sensitive "pop-up" help using
  > JavaScript.  I imagine they are doing this for the effect that:
  > (1) The main window stays open;
  > (2) The new pop-up window is smaller than full-screen and has none of the
  > normal browsing controls -- so it doesn't really look so much a web page.
  >
  > The pop-up is invoked by code like:
  > <A href="JavaScript:Help('foobar.htm')">definition of FooBar</A>
  >
  > Obviously, the HTML file is available if one can figure out how to hunt it
  > down (it's fairly well hidden).  Lynx just generates a message:  "Alert!:
  > Unsupported URL scheme!" and nothing happens.
  >
  > Is there an alternative way to code this so that 4x browsers still get the
  > no-frills pop-up version, but Lynx (and other JavaScript-free) users get
  the
  > regular URL for the help text?
  

-- 
Charles McCathieNevile    mailto:charles@w3.org    phone: +61 (0) 409 134 136
W3C Web Accessibility Initiative                      http://www.w3.org/WAI
Location: I-cubed, 110 Victoria Street, Carlton VIC 3053, Australia
September - November 2000: 
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Received on Tuesday, 7 November 2000 07:15:15 GMT

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