#!/usr/bin/perl  -w

use CGI qw(:standard);
use CGI::Carp qw(fatalsToBrowser);
use strict;
my $query = new CGI;


my $JSCRIPT=<<EOF;

function sub_dispatcher(passit) {
  alert("This \'Alert\' is within the js sub_dispatcher fuction which holds the argument \'" +  passit +  "\' passed to it from the (indirect) form button. This value \'" + passit + "\' is in turn passed to a textfield.");
  document.sql_tool.tag.value = passit;
  document.sql_tool.submit();
}

var url1 = 'http://bioinfo.weizmann.ac.il/safety/images/db_connect_qfile.htm';
var url2 = 'http://bioinfo.weizmann.ac.il/safety/images/db_connect_qfile.txt';
var myRef1; var myRef2;
function windo(arg){
  if(arg == "win1"){
      if(myRef1 == null ||  myRef1.closed){
        myRef1 = window.open(url1,'mywin1','left=20,top=20,width=500,height=500,resizable=1,scrollbars=1');
      }else if(!myRef1.closed){
        myRef1.focus();
        myRef1.location.reload(true);
      }
  }else{
      alert('Now inside js window function. Statements that follow open win2, but will not focus window if already open. \(What is lost here that is not lost with the other \(direct\) form button \(win1\) which applies parallel statements?\)');
      if(myRef2 == null ||  myRef2.closed){
        myRef2 = window.open(url2,'mywin2','left=20,top=20,width=500,height=500,resizable=1,scrollbars=1');
        alert("Inside inner \'if\' block; opening win2");
      }else if(!myRef2.closed){
        alert("focus win2");
        myRef2.focus();
        myRef2.location.reload(true);
      }
      //resetting
      document.sql_tool.tag.value = 'waiting to receive tag';
      document.sql_tool.submit();
  }
}

EOF
;

#SETTING HEADER - HTML:
print $query->header();

print $query->start_html(-title => 'Selection ',
                         -BGCOLOR=>'lavender',
                         -script=>$JSCRIPT);

#SETTING UP A FORM FOR INPUT:
print $query->startform(-name=>'sql_tool');
print $query->button(-name=>'listfile',
                     -value=>'direct function-call',
                     -onClick=>"windo('win1')"
                      ),p;
print $query->button(-name=>'embedvar',
                     -value=>'indirect function-call',
                     -onClick=>"sub_dispatcher('call')"
                      ),p;
print $query->textfield(-name=>'tag'
                        #-value=>'passed'
                       ),p;

print $query->endform(),
hr;
#------------------------------------------------------

#TAG VARIABLE:
  my $sub_select = $query->param('tag');
  print "Now $sub_select from textfield",p;
  my $comment = "The tag \'$sub_select\' read true in a control statement so that a subroutine is called in which, in turn, the js window function is called by argument.";

#JS FUNCTION CALL:
   if($sub_select eq 'call'){
      print "$comment",p;
      viewfile(\$comment);
   }

print end_html;


sub viewfile()
{
        my $writsql= "-code=>\'windo(\"win2\")\'}),p";
        my $prntvar =  "print \$query->start_html(-script=>{-language=>\'JavaScript',$writsql;\n";
        eval $prntvar;
}