#
# $Id: lonspreadsheet.pm,v 1.5 2003/05/27 19:17:07 matthew Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# The LearningOnline Network with CAPA
# Spreadsheet/Grades Display Handler
#
# POD required stuff:
=head1 NAME
lonspreadsheet
=head1 SYNOPSIS
Spreadsheet interface to internal LON-CAPA data
=head1 DESCRIPTION
Lonspreadsheet provides course coordinators the ability to manage their
students grades online. The students are able to view their own grades, but
not the grades of their peers. The spreadsheet is highly customizable,
offering the ability to use Perl code to manipulate data, as well as many
built-in functions.
=head2 Functions available to user of lonspreadsheet
=over 4
=cut
package Apache::lonspreadsheet;
use strict;
use Apache::classcalc();
use Apache::studentcalc();
use Apache::assesscalc();
use Apache::Constants qw(:common :http);
use Apache::lonmenu();
use Apache::lonnet;
use Apache::lonhtmlcommon;
use HTML::Entities();
##
## HTML utility subroutines really should go in lonhtmlcommon
##
sub textfield {
my ($title,$name,$value)=@_;
return "\n<p><b>$title:</b><br>".
'<input type=text name="'.$name.'" size=80 value="'.$value.'">';
}
sub hiddenfield {
my ($name,$value)=@_;
return '<input type=hidden name="'.$name.'" value="'.$value.'" />'."\n";
}
sub selectbox {
my ($title,$name,$value,%options)=@_;
my $selout="\n<p><b>$title:</b><br>".'<select name="'.$name.'">';
foreach (sort keys(%options)) {
$selout.='<option value="'.$_.'"';
if ($_ eq $value) { $selout.=' selected'; }
$selout.='>'.$options{$_}.'</option>';
}
return $selout.'</select>';
}
sub file_dialogs {
my ($spreadsheet) = @_;
my $bgcolor = "#FFFFFF";
my $sheettype = $spreadsheet->{'type'};
my $result = '';
##
## Deal with saving the spreadsheet
if (exists($ENV{'form.save'}) &&
exists($ENV{'form.savefilename'})) {
$spreadsheet->filename($ENV{'form.savefilename'});
my $save_status = $spreadsheet->save();
if ($save_status ne 'ok') {
$result .= "An error occurred while saving the spreadsheet".
"There error is:".$save_status;
return $result;
} else {
$result .= "Spreadsheet saved as ".$ENV{'form.savefilename'};
}
} elsif (exists($ENV{'form.newformula'}) &&
exists($ENV{'form.cell'}) &&
$ENV{'form.cell'} ne '' ) {
##
## Make any requested modifications to the spreadsheet
$spreadsheet->modify_cell($ENV{'form.cell'},
$ENV{'form.newformula'});
$spreadsheet->save_tmp();
# output that we are dealing with a temporary file
$result .=&hiddenfield('workcopy',$sheettype);
$result .='<pre>'.$ENV{'form.cell'}.' = '.
$ENV{'form.newformula'}."</pre>\n";
}
##
## Editing code
$result .=&hiddenfield('cell','').
&hiddenfield('newformula','');
##
## Create the save and load dialogs
my $filename = $spreadsheet->filename();
$filename = '' if ($filename =~ /^default\.$sheettype/i);
$filename =~ s/_$sheettype$//;
my $save_dialog = '<nobr>'.
'<input type="submit" name="save" value="Save as" /> '.
'<input type="text" name="savefilename" size="30" value="'.
$filename.'" />'.
'</nobr>';
my $makedefault_dialog = '<input type="submit" name="makedefault" '.
'value="Make This Sheet the Default"/>';
#
my $link = '<a href="javascript:openbrowser'.
"('sheet','loadfilename','spreadsheet')\">Browse</a>";
my $load_dialog = <<END;
<table bgcolor="$bgcolor">
<tr><td><input type="submit" name="load" value="Load" /></td>
<td><nobr>
<input type="text" name="loadfilename" size="25" value="$filename" />
$link</nobr>
</td></tr>
<tr><td> </td><td>
<select name="fileselect" onchange="document.sheet.loadfilename.value=document.sheet.fileselect.value" >
<option name="Default">Default</option>
END
foreach my $sheetfilename ($spreadsheet->othersheets()) {
$sheetfilename =~ s/_$sheettype$//;
$load_dialog .= ' <option name="'.$sheetfilename.'"';
if ($filename eq $sheetfilename) {
$load_dialog .= ' selected';
}
$load_dialog .= '>'.$sheetfilename."</option>\n";
}
$load_dialog .= "</td><td> </td></tr>\n</table>\n";
#
$result .=<<END;
<!-- load / save dialogs -->
<table cellspacing="2">
<tr>
<td>$load_dialog</td>
<td>
<table bgcolor="$bgcolor">
<tr><td>$save_dialog</td></tr>
<tr><td align="center">$makedefault_dialog</td></tr>
</table>
</td>
</tr>
</table>
END
return $result;
}
sub handler {
my $r=shift;
#
# Overload checking
#
# Check this server
my $loaderror=&Apache::lonnet::overloaderror($r);
if ($loaderror) { return $loaderror; }
# Check the course homeserver
$loaderror= &Apache::lonnet::overloaderror($r,
$ENV{'course.'.$ENV{'request.course.id'}.'.home'});
# if ($loaderror) { return $loaderror; }
#
# HTML Header
#
if ($r->header_only) {
$r->content_type('text/html');
$r->send_http_header;
return OK;
}
#
# Roles Checking
#
# Needs to be in a course
if (! $ENV{'request.course.fn'}) {
# Not in a course, or not allowed to modify parms
$ENV{'user.error.msg'}=
$r->uri.":opa:0:0:Cannot modify spreadsheet";
return HTTP_NOT_ACCEPTABLE;
}
#
# Get query string for limited number of parameters
#
&Apache::loncommon::get_unprocessed_cgi
($ENV{'QUERY_STRING'},['sname','sdomain','usymb','filename']);
#
# Deal with restricted student permissions
#
if ($ENV{'request.role'} =~ /^st\./) {
delete $ENV{'form.cell'} if (exists($ENV{'form.cell'}));
delete $ENV{'form.newformula'} if (exists($ENV{'form.newformula'}));
}
#
# Determine basic information about the spreadsheet
my ($sheettype) = ($r->uri=~/\/(\w+)$/);
#
my $symb = undef;
$symb = $ENV{'form.usymb'} if (exists($ENV{'form.usymb'}));
my $name = $ENV{'user.name'};
my $domain = $ENV{'user.domain'};
if (exists($ENV{'form.sname'})) {
$name = $ENV{'form.sname'};
$domain = $ENV{'form.sdomain'};
}
#
# Open page, try to prevent browser cache.
#
$r->content_type('text/html');
$r->header_out('Cache-control','no-cache');
$r->header_out('Pragma','no-cache');
$r->send_http_header;
##
## Check permissions
my $allowed_to_edit = &Apache::lonnet::allowed('mgr',
$ENV{'request.course.id'});
my $allowed_to_view = &Apache::lonnet::allowed('vgr',
$ENV{'request.course.id'});
#
# Only those able to view others grades will be allowed to continue
# if they are not requesting their own.
if (($sheettype eq 'classcalc') ||
($name ne $ENV{'user.name'} ) ||
($domain ne $ENV{'user.domain'})) {
if (! $allowed_to_view) {
$r->print('<h1>Access Permission Denied</h1>'.
'</form></body></html>');
return OK;
}
}
#
# Header....
#
$r->print('<html><head><title>LON-CAPA Spreadsheet</title>');
my $nothing = &Apache::lonhtmlcommon::javascript_nothing();
##
## Spit out the javascript required for editing
##
if ($allowed_to_edit) {
my $extra_javascript =
&Apache::loncommon::browser_and_searcher_javascript();
$r->print(<<ENDSCRIPT);
<script language="JavaScript">
$extra_javascript
var editwin;
function celledit(cellname,cellformula) {
var edit_text = '';
// cellformula may contain less-than and greater-than symbols, so
// we need to escape them?
edit_text +='<html><head><title>Cell Edit Window</title></head><body>';
edit_text += '<form name="editwinform">';
edit_text += '<center><h3>Cell '+cellname+'</h3>';
edit_text += '<textarea name="newformula" cols="40" rows="6"';
edit_text += ' wrap="off" >'+cellformula+'</textarea>';
edit_text += '</br>';
edit_text += '<input type="button" name="accept" value="Accept"';
edit_text += ' onClick=\\\'javascript:';
edit_text += 'opener.document.sheet.cell.value=';
edit_text += '"'+cellname+'";';
edit_text += 'opener.document.sheet.newformula.value=';
edit_text += 'document.editwinform.newformula.value;';
edit_text += 'opener.document.sheet.submit();';
edit_text += 'self.close()\\\' />';
edit_text += ' ';
edit_text += '<input type="button" name="abort" ';
edit_text += 'value="Discard Changes"';
edit_text += ' onClick="javascript:self.close()" />';
edit_text += '</center></body></html>';
if (editwin != null && !(editwin.closed) ) {
editwin.close();
}
editwin = window.open($nothing,'CellEditWin','height=200,width=350,scrollbars=no,resizeable=yes,alwaysRaised=yes,dependent=yes',true);
editwin.document.write(edit_text);
}
</script>
ENDSCRIPT
}
$r->print('</head>'.&Apache::loncommon::bodytag('Grades Spreadsheet').
'<form action="'.$r->uri.'" name="sheet" method="post">');
$r->print(&hiddenfield('sname' ,$ENV{'form.sname'}).
&hiddenfield('sdomain',$ENV{'form.sdomain'}).
&hiddenfield('usymb' ,$ENV{'form.usymb'}).
&Apache::lonmenu::regflush());
$r->rflush();
##
## Determine the filename to use
my $filename = undef;
if ($allowed_to_edit) {
$filename = $ENV{'form.filename'} if (exists($ENV{'form.filename'}));
#
if (exists($ENV{'form.load'}) && exists($ENV{'form.loadfilename'})) {
$filename = $ENV{'form.loadfilename'};
}
}
##
## Make the spreadsheet
&Apache::Spreadsheet::initialize_spreadsheet_package();
my $spreadsheet = undef;
if ($sheettype eq 'classcalc') {
$spreadsheet = Apache::classcalc->new($name,$domain,$filename,undef);
} elsif ($sheettype eq 'studentcalc') {
$spreadsheet = Apache::studentcalc->new($name,$domain,$filename,undef);
} elsif ($sheettype eq 'assesscalc' &&
defined($symb) &&
$allowed_to_edit) {
$spreadsheet = Apache::assesscalc->new($name,$domain,$filename,$symb);
} else {
return HTTP_NOT_ACCEPTABLE;
}
if (! defined($spreadsheet)) {
# error error - run in circles, scream and shout
return;
}
#
# Output selector
$r->print('<input type="submit" value="Update Display" /><br />');
##
## Editing/loading/saving
if ($allowed_to_edit) {
$r->print('<table><tr><td>'.$spreadsheet->html_header().'</td>'.
'<td valign="bottom">'.
&file_dialogs($spreadsheet)."</td></tr></table>\n");
$r->rflush();
} else {
$r->print('<table><tr><td>'.$spreadsheet->html_header().
"</td></tr></table>\n");
}
#
# Keep track of the filename
$r->print(&hiddenfield('filename',$filename));
#
# Keep track of the number of times we have been called, sort of.
$r->print(&hiddenfield('not_first_run','whatever'));
#
if (exists($ENV{'form.not_first_run'}) || $sheettype ne 'classcalc') {
$r->print($spreadsheet->get_html_title());
if ($allowed_to_view || $allowed_to_edit) {
$r->print($spreadsheet->parent_link());
}
$spreadsheet->display($r);
} else {
$r->print("<h2>Make your selections and bonk the 'update display' button</h2>");
}
$r->print('</form></body></html>');
return OK;
}
1;
__END__
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