Another step towards Javascriptinput-style script loading

common/lib/capa/capa/templates/textinput_dynamath.html

@@ -2,6 +2,10 @@
 ### version of textline.html which does dynamic math
 ###
 <section class="text-input-dynamath textinputdynamath capa_inputtype" id="inputtype_${id}">
+
+    <div class="textinputdynamath_data" data-preprocessor="MathjaxPreprocessorFor6002x"/>
+    <div class="script_placeholder" data-src="/static/js/mathjax_preprocessor_for_6002x.js"/>
+
     % if state == 'unsubmitted':
     <div class="unanswered" id="status_${id}">
     % elif state == 'correct':
@@ -20,7 +24,6 @@
         style="display:none;"
     % endif
     />
-      <div class="script_placeholder" data-src="/static/js/mathjax_preprocessor_for_6002x.js"/>
     <p class="status">
     % if state == 'unsubmitted':
     unanswered

common/lib/xmodule/xmodule/js/src/capa/display.coffee

@@ -297,12 +297,17 @@ class @Problem
 
   refreshMath: (event, element) =>
     element = event.target unless element
-    target = "display_#{element.id.replace(/^input_/, '')}"
+    elid = element.id.replace(/^input_/,'')
+
+    target = "display_" + elid
+
+    preprocessor_tag = "inputtype_" + elid
+    mathjax_preprocessor = @inputtypeDisplays[preprocessor_tag]
 
     if jax = MathJax.Hub.getAllJax(target)[0]
       eqn = $(element).val()
-      if @mathjax_preprocessor
-        eqn = @mathjax_preprocessor(eqn)
+      if mathjax_preprocessor
+        eqn = mathjax_preprocessor(eqn)
 
       MathJax.Hub.Queue ['Text', jax, eqn],
         [@updateMathML, jax, element]
@@ -324,9 +329,13 @@ class @Problem
   inputtypeSetupMethods:
 
     textinputdynamath: (element) =>
-      preprocessorClass = window['MathjaxPreprocessorFor6002x']
+      data = $(element).find('.textinputdynamath_data')
+
+      preprocessorClassName = data.data('preprocessor')
+      preprocessorClass = window[preprocessorClassName]
+
       preprocessor = new preprocessorClass()
-      alert preprocessor.fn
+      return preprocessor.fn
 
     javascriptinput: (element) =>