Get math working.

lms/static/coffee/src/discussion/views/discussion_thread_view.coffee

@@ -20,9 +20,15 @@ class @DiscussionThreadView extends Backbone.View
       @$(".vote-btn").addClass("is-cast")
     @$("span.timeago").timeago()
     Markdown.makeWmdEditor @$(".reply-body"), "", DiscussionUtil.urlFor("upload"), (text) -> DiscussionUtil.postMathJaxProcessor(text)
+    @convertMath()
     @renderResponses()
     @
 
+  convertMath: ->
+    element = @$(".post-body")
+    element.html DiscussionUtil.postMathJaxProcessor DiscussionUtil.markdownWithHighlight element.html()
+    MathJax.Hub.Queue ["Typeset", MathJax.Hub, element.attr("id")]
+
   renderResponses: ->
     $.ajax @model.id, success: (data, textStatus, xhr) =>
       comments = new Comments(data['content']['children'])
@@ -84,7 +90,7 @@ class @DiscussionThreadView extends Backbone.View
 
   submitComment: ->
     url = @model.urlFor('reply')
-    body = DiscussionUtil.getWmdContent @$el, $.proxy(@$, @), "reply-body"
+    body = @$("#wmd-input").val()
     response = new Comment(body: body, created_at: (new Date()).toISOString(), username: window.user.get("username"), votes: { up_count: 0 })
     @renderResponse(response)
 

lms/static/coffee/src/discussion/views/thread_response_view.coffee

@@ -10,9 +10,15 @@ class @ThreadResponseView extends Backbone.View
     if window.user.voted(@model)
       @$(".vote-btn").addClass("is-cast")
     @$(".posted-details").timeago()
+    @convertMath()
     @renderComments()
     @
 
+  convertMath: ->
+    element = @$(".response-body")
+    element.html DiscussionUtil.postMathJaxProcessor DiscussionUtil.markdownWithHighlight element.html()
+    MathJax.Hub.Queue ["Typeset", MathJax.Hub, element.attr("id")]
+
   renderComments: ->
       @model.get("comments").each @renderComment
 

lms/templates/discussion/single_thread.html

@@ -64,56 +64,6 @@
   </div>
 </nav>
 
-<article class="new-post-article">
-  <div class="inner-wrapper">
-    <form class="new-post-form">
-      <div class="left-column">
-        <label>Create new post in:</label>
-        <div class="topic-drop">
-          <a href="#" class="topic-drop-btn">Homework / Week 1 <span class="drop-arrow">▾</span></a>
-          <ul class="topic-drop-menu">
-            <li><a href="#">All</a></li>
-            <li><a href="#">Following</a></li>
-            <li><a href="#">General</a></li>
-            <li>
-              <a href="#">Homework</a>
-              <ul>
-                <li><a href="#">Week 1</a></li>
-                <li>
-                  <a href="#">Week 2</a>
-                  <ul>
-                    <li><a href="#">Problem 1</a></li>
-                    <li><a href="#">Problem 2</a></li>
-                  </ul>
-                </li>
-              </ul>
-            </li>
-          </ul>
-        </div>
-        <div class="options">
-          <input type="checkbox" name="follow" id="new-post-follow" checked><label for="new-post-follow">follow this post</label>
-          <br>
-          <input type="checkbox" name="follow" id="new-post-anonymous" checked><label for="new-post-anonymous">post anonymously</label>
-        </div>
-      </div>
-      <div class="right-column">
-        <div class="form-row">
-          <input type="text" class="new-post-title" name="title" placeholder="Title">
-        </div>
-        <div class="form-row">
-          <textarea class="new-post-body" name="body" placeholder="Enter your question or comment…"></textarea>
-          <div class="new-post-preview"><span class="new-post-preview-label">Preview</span></div>
-        </div>
-        <div class="form-row">
-          <input type="text" class="new-post-tags" name="tags" placeholder="Tags">
-        </div>
-        <input type="submit" class="submit" value="Add post">
-        <a href="#" class="new-post-cancel">Cancel</a>
-      </div>
-    </form>
-  </div>
-</article>
-
 <div class="discussion container">
   <div class="discussion-body">
     <div class="sidebar">