Finalizing fixes to MathJax enhancements

* Cell.prototype.typeset functionality restored
* MathJax configuration files back in .js, delayedStartup
* Renamed HUB to hub
* Removed vestigial comment
* Restored Markdown Cell placeholder render functionality

IPython/frontend/html/notebook/static/js/cell.js

@@ -50,8 +50,11 @@ var IPython = (function (IPython) {
         });
     };
 
-    // prototype typeset method does nothing, see TextCell typeset
     Cell.prototype.typeset = function () {
+        if (window.MathJax){
+            var cell_math = this.element.get(0);
+            MathJax.Hub.Queue(["Typeset",MathJax.Hub,cell_math]);
+        }
     };
 
     Cell.prototype.select = function () {

IPython/frontend/html/notebook/static/js/mathjaxutils.js

@@ -16,6 +16,18 @@ IPython.mathjaxutils = (function (IPython) {
     var init = function () {
         if (window.MathJax) {
             // MathJax loaded
+            MathJax.Hub.Config({
+                tex2jax: {
+                    inlineMath: [ ['$','$'], ["\\(","\\)"] ],
+                    displayMath: [ ['$$','$$'], ["\\[","\\]"] ],
+                    processEnvironments: true
+                },
+                displayAlign: 'left', // Change this to 'center' to center equations.
+                "HTML-CSS": {
+                    styles: {'.MathJax_Display': {"margin": 0}}
+                }
+            });
+            MathJax.Hub.Configured();
         } else if (window.mathjax_url != "") {
             // Don't have MathJax, but should. Show dialog.
             var dialog = $('<div></div>')
@@ -89,12 +101,12 @@ IPython.mathjaxutils = (function (IPython) {
     //    math, then push the math string onto the storage array.
     //  The preProcess function is called on all blocks if it has been passed in
     var process_math = function (i, j, pre_process) {
-        var HUB = MathJax.Hub;
+        var hub = MathJax.Hub;
         var block = blocks.slice(i, j + 1).join("").replace(/&/g, "&amp;") // use HTML entity for &
         .replace(/</g, "&lt;") // use HTML entity for <
         .replace(/>/g, "&gt;") // use HTML entity for >
         ;
-        if (HUB.Browser.isMSIE) {
+        if (hub.Browser.isMSIE) {
             block = block.replace(/(%[^\n]*)\n/g, "$1<br/>\n")
         }
         while (j > i) {

IPython/frontend/html/notebook/static/js/textcell.js

@@ -40,7 +40,6 @@ var IPython = (function (IPython) {
             onKeyEvent: $.proxy(this.handle_codemirror_keyevent,this)
         });
         // The tabindex=-1 makes this div focusable.
-        // id is a unique cell_id necessary for updating MathJax intelligently
         var render_area = $('<div/>').addClass('text_cell_render border-box-sizing').
             addClass('rendered_html').attr('tabindex','-1');
         cell.append(input_area).append(render_area);
@@ -78,13 +77,6 @@ var IPython = (function (IPython) {
         return false;
     };
 
-    TextCell.prototype.typeset = function () {
-        if (window.MathJax){
-            var cell_math = this.element.get(0);
-            MathJax.Hub.Queue(["Typeset",MathJax.Hub,cell_math]);
-        }
-    };
-
 
     TextCell.prototype.select = function () {
         IPython.Cell.prototype.select.apply(this);
@@ -229,35 +221,33 @@ var IPython = (function (IPython) {
         if (this.rendered === false) {
             var text = this.get_text();
             if (text === "") { text = this.placeholder; }
-            else {
-                text = IPython.mathjaxutils.remove_math(text)
-                var html = IPython.markdown_converter.makeHtml(text);
-                html = IPython.mathjaxutils.replace_math(html)
-                try {
-                    this.set_rendered(html);
-                } catch (e) {
-                    console.log("Error running Javascript in Markdown:");
-                    console.log(e);
-                    this.set_rendered($("<div/>").addClass("js-error").html(
-                        "Error rendering Markdown!<br/>" + e.toString())
-                    );
-                }
-                this.element.find('div.text_cell_input').hide();
-                this.element.find("div.text_cell_render").show();
-                var code_snippets = this.element.find("pre > code");
-                code_snippets.replaceWith(function () {
-                    var code = $(this).html();
-                    /* Substitute br for newlines and &nbsp; for spaces
-                       before highlighting, since prettify doesn't
-                       preserve those on all browsers */
-                    code = code.replace(/(\r\n|\n|\r)/gm, "<br/>");
-                    code = code.replace(/ /gm, '&nbsp;');
-                    code = prettyPrintOne(code);
-
-                    return '<code class="prettyprint">' + code + '</code>';
-                });
-                this.typeset()
+            text = IPython.mathjaxutils.remove_math(text)
+            var html = IPython.markdown_converter.makeHtml(text);
+            html = IPython.mathjaxutils.replace_math(html)
+            try {
+                this.set_rendered(html);
+            } catch (e) {
+                console.log("Error running Javascript in Markdown:");
+                console.log(e);
+                this.set_rendered($("<div/>").addClass("js-error").html(
+                    "Error rendering Markdown!<br/>" + e.toString())
+                );
             }
+            this.element.find('div.text_cell_input').hide();
+            this.element.find("div.text_cell_render").show();
+            var code_snippets = this.element.find("pre > code");
+            code_snippets.replaceWith(function () {
+                var code = $(this).html();
+                /* Substitute br for newlines and &nbsp; for spaces
+                   before highlighting, since prettify doesn't
+                   preserve those on all browsers */
+                code = code.replace(/(\r\n|\n|\r)/gm, "<br/>");
+                code = code.replace(/ /gm, '&nbsp;');
+                code = prettyPrintOne(code);
+
+                return '<code class="prettyprint">' + code + '</code>';
+            });
+            this.typeset()
             this.rendered = true;
         }
     };

IPython/frontend/html/notebook/templates/notebook.html

@@ -2,21 +2,7 @@
 {% block stylesheet %}
 
 {% if mathjax_url %}
-<script type="text/x-mathjax-config">
-    MathJax.Hub.Config({
-        tex2jax: {
-            inlineMath: [ ['$','$'], ["\\(","\\)"] ],
-            displayMath: [ ['$$','$$'], ["\\[","\\]"] ],
-            processEnvironments: true
-        },
-        displayAlign: 'left', // Change this to 'center' to center equations.
-        "HTML-CSS": {
-            styles: {'.MathJax_Display': {"margin": 0}}
-        }
-        });
-</script>
-
-<script type="text/javascript" src="{{mathjax_url}}?config=TeX-AMS_HTML-full" charset="utf-8"></script>
+<script type="text/javascript" src="{{mathjax_url}}?config=TeX-AMS_HTML-full&delayStartupUntil=configured" charset="utf-8"></script>
 {% end %}
 <script type="text/javascript">
 // MathJax disabled, set as null to distingish from *missing* MathJax,