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Re: Pass variable from Perl-AJAX-Perl

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trudge wrote:
^^^^^^
Your real name should be there.

> In my HTML page I call the first perl script:

No, you do not.
 
> ajaxRequest.open("POST", "http://127.0.0.1/cgi-bin/ajax/kba-search.pl",
> true);
> 
> which populates my select lists.

No, most certainly it does not.  If you use the XMLHttpRequest API directly, 
this only *prepares* to make an HTTP request to your locally installed Web 
server – it is the send() call that makes it –, and the part of your code 
that processes the resulting response populates the “select” elements 
(likewise, in the function whose reference is assigned to the 
“onreadystatechange” or “onload” property).

In a sufficiently modern runtime environment, it would go like this:

  var ajaxRequest = new XMLHttpRequest();

  ajaxRequest.open("POST", "http://127.0.0.1/cgi-bin/ajax/kba-search.pl",
    true);

  ajaxRequest.onload = function () {
    /* populate the “select” elements */
  };

  ajaxRequest.send(null);

(A retrieval operation should be a *GET* operation instead.  See REST.)

> Then I need to capture the user choice (say a book title) so I can pass it
> to another Perl script to return the data about that choice.
> 
> How do I capture that data? In Perl or JavaScript?

Since Perl usally does not run in the Web browser, you would have to use an 
ECMAScript implementation like JavaScript to access the DOM implementation 
in order to determine the user selection.

Have you read the FAQ yet?  If no, why not?  Obviously you also have not 
read the XHR tutorial I have referred you to.

-- 
PointedEars
FAQ: <http://PointedEars.de/faq> | SVN: <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | ES Matrix: <http://PointedEars.de/es-matrix>
Please do not Cc: me. / Bitte keine Kopien per E-Mail.

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Pass variable from Perl-AJAX-Perl trudge <nospam@softouch.on.ca> - 2014-05-22 06:18 -0400
  Re: Pass variable from Perl-AJAX-Perl Ben Bacarisse <ben.usenet@bsb.me.uk> - 2014-05-22 12:20 +0100
    Re: Pass variable from Perl-AJAX-Perl trudge <nospam@softouch.on.ca> - 2014-05-22 12:25 -0400
      Re: Pass variable from Perl-AJAX-Perl Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-05-22 19:16 +0200
        Re: Pass variable from Perl-AJAX-Perl John Harris <niam@jghnorth.org.uk.invalid> - 2014-05-23 10:13 +0100
      Re: Pass variable from Perl-AJAX-Perl Denis McMahon <denismfmcmahon@gmail.com> - 2014-05-22 17:30 +0000
  Re: Pass variable from Perl-AJAX-Perl Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-05-22 13:27 +0200
  Re: Pass variable from Perl-AJAX-Perl Denis McMahon <denismfmcmahon@gmail.com> - 2014-05-22 17:04 +0000
    Re: Pass variable from Perl-AJAX-Perl trudge <nospam@softouch.on.ca> - 2014-05-22 13:41 -0400

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