Merge pull request #711 from MITx/kimth/onreset-type

onreset rerandomize option

common/lib/xmodule/xmodule/capa_module.py

@@ -179,6 +179,8 @@ class CapaModule(XModule):
             return "per_student"
         elif rerandomize == "never":
             return "never"
+        elif rerandomize == "onreset":
+            return "onreset"
         else:
             raise Exception("Invalid rerandomize attribute " + rerandomize)
 
@@ -307,7 +309,7 @@ class CapaModule(XModule):
             save_button = False
 
         # Only show the reset button if pressing it will show different values
-        if self.rerandomize != 'always':
+        if self.rerandomize not in ["always", "onreset"]:
             reset_button = False
 
         # User hasn't submitted an answer yet -- we don't want resets
@@ -617,7 +619,7 @@ class CapaModule(XModule):
             return "Refresh the page and make an attempt before resetting."
 
         self.lcp.do_reset()
-        if self.rerandomize == "always":
+        if self.rerandomize in ["always", "onreset"]:
             # reset random number generator seed (note the self.lcp.get_state()
             # in next line)
             self.lcp.seed = None

doc/xml-format.md

@@ -281,6 +281,7 @@ __Inherited:__
 *	`showanswer` - When to show answer. For 'attempted', will show answer after first attempt. Values: never, attempted, answered, closed. Default: closed. Optional.
 *	`graded` - Whether this section will count towards the students grade. "true" or "false". Defaults to "false".
 *	`rerandomise` - Randomize question on each attempt. Values: 'always' (students see a different version of the problem after each attempt to solve it)
+                                                            'onreset' (students see a different version of the problem when they reset, but are not forced to reset after each check)
                                                             'never' (all students see the same version of the problem)
                                                             'per_student' (individual students see the same version of the problem each time the look at it, but that version is different from what other students see)
                                                             Default: 'always'. Optional.