--- loncom/homework/response.pm	2014/12/30 20:03:10	1.238
+++ loncom/homework/response.pm	2015/03/07 23:05:57	1.242
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # various response type definitons response definition
 #
-# $Id: response.pm,v 1.238 2014/12/30 20:03:10 raeburn Exp $
+# $Id: response.pm,v 1.242 2015/03/07 23:05:57 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -181,7 +181,6 @@ sub setrandomnumber {
     } else {
 	($rndmod,$rndmod2)=&Apache::lonnet::digest("$id1,$id2");
     }
-    $Apache::lonhomework::results{'resource.'.$id1.'.rawrndseed'}=$rndseed;
     if ($rndseed =~/([,:])/) {
 	my $char=$1;
 	use integer;
@@ -198,7 +197,6 @@ sub setrandomnumber {
 	}
     }
     &Apache::lonxml::debug("randseed $rndmod $rndseed");
-    $Apache::lonhomework::results{'resource.'.$id1.'.rndseed'}=$rndseed;
     &Apache::lonnet::setup_random_from_rndseed($rndseed);
     return '';
 }
@@ -580,15 +578,59 @@ sub start_mathresponse {
 sub edit_mathresponse_button {
     my ($partid,$id)=@_;
     my $field = 'HWVAL_'.$partid.'_'.$id;
-    my $btype = $env{'browser.type'};
-    my $bversion = $env{'browser.version'};
-    if (($btype eq 'explorer' && $bversion < 9) || ($btype eq 'safari' && $bversion < 3) ||
-        ($btype eq 'mozilla' && $bversion < 3)) {
-      # DragMath applet
-      my $button=&mt('Edit Answer');
-#     my $helplink=&Apache::loncommon::help_open_topic('Formula_Editor');
-      my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
-      return(<<ENDFORMULABUTTON);
+    my $eqneditor = 'lcmath';
+    if ($env{'browser.type'} eq 'safari') {
+        if ($env{'browser.os'} eq 'mac') {
+            my ($prefix,$version) = ($env{'browser.version'} =~ /^(\d*)(\d{3})\./);
+            if ($env{'browser.mobile'}) {
+                if (($version < 531) || (($prefix eq '') && ($version < 533))) {
+                    $eqneditor = '';
+                }
+            } elsif ($version < 522) {
+                $eqneditor = 'dragmath';
+            }
+        }
+    } elsif ($env{'browser.type'} eq 'explorer') {
+        if ($env{'browser.version'} < 9) {
+            $eqneditor = 'dragmath';
+        }
+    } elsif ($env{'browser.type'} eq 'mozilla') {
+        if ($env{'browser.version'} < 4) {
+            $eqneditor = 'dragmath';
+        } else {
+            if ($env{'browser.info'} =~ /^firefox\-([\d\.]+)/) {
+                my $firefox = $1;
+                if ($firefox < 4) {
+                    $eqneditor = 'dragmath';
+                }
+            }
+        }
+    }
+    if ($eqneditor eq 'lcmath') {
+        if (($env{'request.course.id'}) && ($env{'request.state'} ne 'construct')) {
+            if (exists($env{'course.'.$env{'request.course.id'}.'.uselcmath'})) {
+                if ($env{'course.'.$env{'request.course.id'}.'.uselcmath'} eq '0') {
+                    $eqneditor = 'dragmath';
+                }
+            } else {
+                my %domdefs = &Apache::lonnet::get_domain_defaults($env{'course.'.$env{'request.course.id'}.'.domain'});
+                if ($domdefs{'uselcmath'} eq '0') {
+                    $eqneditor = 'dragmath';
+                }
+            }
+        } else {
+            my %domdefs = &Apache::lonnet::get_domain_defaults($env{'course.'.$env{'request.course.id'}.'.domain'});
+            if ($domdefs{'uselcmath'} eq '0') {
+                $eqneditor = 'dragmath';
+            }
+        }
+    }
+    if ($eqneditor eq 'dragmath') {
+        # DragMath applet
+        my $button=&mt('Edit Answer');
+#       my $helplink=&Apache::loncommon::help_open_topic('Formula_Editor');
+        my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
+        return(<<ENDFORMULABUTTON);
 <script type="text/javascript" language="JavaScript">
 function LC_mathedit_${field} (LCtextline) {
     thenumber = LCtextline;
@@ -601,8 +643,7 @@ function LC_mathedit_${field} (LCtextlin
 </script>
 <a href="javascript:LC_mathedit_${field}('${field}');void(0);"><img class="stift" src="$iconpath/stift.gif" alt="$button" title="$button" /></a>
 ENDFORMULABUTTON
-      
-    } else {
+    } elsif ($eqneditor eq 'lcmath') {
         # LON-CAPA math equation editor
         my $mathjaxjs;
         unless (lc(&Apache::lontexconvert::tex_engine()) eq 'mathjax') {
@@ -617,6 +658,7 @@ MATHJAX_SCRIPT
 <script type="text/javascript">
   var LCmathField = document.getElementById('${field}');
   LCmathField.className += ' math'; // note the space
+  LCmathField.setAttribute('data-implicit_operators', 'true');
   var LCMATH_started;
   if (typeof LCMATH_started === 'undefined') {
     $mathjaxjs