Fix multiple LTI tools per page.

common/lib/xmodule/xmodule/lti_module.py

@@ -92,10 +92,10 @@ class LTIModule(LTIFields, XModule):
 
             <form
                     action="${launch_url}"
-                    name="ltiLaunchForm"
+                    name="ltiLaunchForm-${element_id}"
                     class="ltiLaunchForm"
                     method="post"
-                    target="ltiLaunchFrame"
+                    target="ltiLaunchFrame-${element_id}"
                     encType="application/x-www-form-urlencoded"
                 >
                     <input name="launch_presentation_return_url" value="" />

lms/templates/lti.html

@@ -5,10 +5,10 @@
     ## result will be rendered to the below iFrame.
     <form
         action="${launch_url}"
-        name="ltiLaunchForm"
+        name="ltiLaunchForm-${element_id}"
         class="ltiLaunchForm"
         method="post"
-        target="ltiLaunchFrame"
+        target="ltiLaunchFrame-${element_id}"
         encType="application/x-www-form-urlencoded"
     >
 
@@ -26,7 +26,7 @@
 
     ## The result of the form submit will be rendered here.
     <iframe
-        name="ltiLaunchFrame"
+        name="ltiLaunchFrame-${element_id}"
         class="ltiLaunchFrame"
         src=""
     ></iframe>