From 00ee7b56445f216cc6e8b5129ca0555bac04f8f9 Mon Sep 17 00:00:00 2001
From: Tom Carter <tomc@spiceworks.com>
Date: Wed, 11 Jun 2014 17:56:13 -0500
Subject: [PATCH] Added preview logic using MathJax. Changed LaTeX output
 environment from tabular to array.

---
 converter.js | 19 ++++++++++++++-----
 index.html   |  3 +++
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/converter.js b/converter.js
index 72d9da5..7a05a17 100644
--- a/converter.js
+++ b/converter.js
@@ -8,6 +8,9 @@
   var latexOutput = {};
 
   var excelParser = {
+    //latexEnvironment: 'tabular',
+    latexEnvironment: 'array',
+
     latexEscape: function(text) {
       var escapeRegExpr = function(str) {
         return str.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
@@ -44,7 +47,7 @@
         args[i] = 'l';
       }
       args = ' | ' + args.join(' | ') + ' | ';
-      var latex = "\\begin{tabular}{" + args + "}\n\\hline\n";
+      var latex = "\\begin{" + excelParser.latexEnvironment + "}{" + args + "}\n\\hline\n";
       for(i=0; i < table.length; i++) {
         var cols = table[i];
         // TODO: replace "&" with "\&"
@@ -59,7 +62,7 @@
         latex += " \\\\ \\hline\n";
       }
 
-      latex += "\\end{tabular}\n";
+      latex += "\\end{" + excelParser.latexEnvironment + "}\n";
       
       return latex;
     },
@@ -130,13 +133,20 @@
             
             // I apologize for the hack :(
             if(id === '1') {
-              $('#latex-output').val(latex);
+              excelParser.showOutput(1);
             }
           });
         });
       });
     },
 
+    showOutput: function(id) {
+      var latex = latexOutput[id];
+      $('#latex-output').val(latex);
+      $('#preview').html('$$\n' + latex + '\n$$');
+      MathJax.Hub.Typeset("preview");
+    },
+
     handleFiles: function(event) {
       // prevent default browser behavior
       event.stopPropagation();
@@ -202,8 +212,7 @@
       // when a new workbook is selected, do stuff!
       $('#workbook').change(function(event) {
         var select = $(event.target);
-        var output = latexOutput[select.val()];
-        $('#latex-output').val(output);
+        excelParser.showOutput(select.val());
       });
     }
   };
diff --git a/index.html b/index.html
index b9c54df..69ce3ac 100644
--- a/index.html
+++ b/index.html
@@ -34,8 +34,11 @@
         <p>Formatting from the Excel document won't be preserved, only the text will be extracted.</p>
         <p>Lovingly hacked together by <a href="http://ericwood.org">Eric Wood</a></p>
       </div>
+      <h4>Preview</h4>
+      <div id="preview">$$ \LaTeX $$</div>
     </div>
     <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
+    <script src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
     <script type="text/javascript" src="zip/zip.js"></script>
     <script type="text/javascript" src="converter.js"></script>
   </body>