Add in some JS messages for when things go wrong.

common/lib/capa/capa/inputtypes.py

@@ -702,7 +702,6 @@ class MatlabInput(CodeInput):
             log.error("External message should be a JSON serialized dict."
                     " Received queue_msg = %s" % queue_msg)
             raise
-        # TODO: needs more error checking
         msg = result['msg']
         return msg
 

common/lib/capa/capa/templates/matlabinput.html

@@ -60,9 +60,21 @@
 
       $("#textbox_${id}").find('.CodeMirror-scroll').height(${int(13.5*eval(rows))});
 
+      var gentle_alert = function (parent_elt, msg) {
+          if($(parent_elt).find('.capa_alert').length) {
+              $(parent_elt).find('.capa_alert').remove();
+          }
+          var alert_elem = "<div>" + msg + "</div>";
+          alert_elem = $(alert_elem).addClass('capa_alert');
+          $(parent_elt).find('.action').after(alert_elem);
+          $(parent_elt).find('.capa_alert').css({opacity: 0}).animate({opacity: 1}, 700);
+      }
+      
+
       // hook up the plot button
       var plot = function(event) {
-          url = $(this).closest('.problems-wrapper').data('url');
+          var problem_elt = $(event.target).closest('.problems-wrapper');
+          url = $(event.target).closest('.problems-wrapper').data('url');
           input_id = "${id}";
 
           // save the codemirror text to the textarea
@@ -73,31 +85,30 @@
 
           answer = input.serialize();
 
-          // setup callback for 
+          // setup callback for after we send information to plot
           var plot_callback = function(response) {
               if(response.success) {
                   window.location.reload();
               }
               else {
-                  // TODO: show message
+                  gentle_alert(problem_elt, msg);
               }
           }
 
           var save_callback = function(response) { 
                   if(response.success) {
+                      // send information to the problem's plot functionality
                       Problem.inputAjax(url, input_id, 'plot', 
                         {'submission': submission}, plot_callback);
                   }
                   else {
-                  // TODO: show any messages
+                      gentle_alert(problem_elt, msg);
                   }
           }
 
           // save the answer
           $.postWithPrefix(url + '/problem_save', answer, save_callback);
 
-
-
       }
       $('#plot_${id}').click(plot);