mathjax-in-instant-markdown-for-vim: An HTML repository from karenyyng

ref In my OSX, the vim-instant-preview is installed in /opt/local/lib/node_modules/instant-markdown-d/ folder, only need to change index.html file

Add MathJax javascript library: add

<script type="text/javascript"
src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>                                                                         
  <script type="text/x-mathjax-config">                                         
	    MathJax.Hub.Config({                                                        
			      tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']]}                            
						    });                                                                            
								  </script>

inside <head></head>, then you should be able to see Math symbols rendered the first time you preview a .md file. However when you change the file and update the preview you will find Math symbols not be rendered anymore as mentioned here, by looking at instant-markdown-d file, you will find it actually creates aMarkdownIt instance (dependency: markdown-it) named md, then in the

input.on('end', function(){
    output.emit('newContent', md.render(body));

});

it sends the md.render(body) as the injected html back to the clients, because markdown-it doesn't support rendering Math yet, that's why the math symbols are gone after updating the preview. So you need to render the math again after the client side receives the html rendered by markdown-it.

To do this, change relevant part in your index.html to be like this

socket.on('newContent', function(newHTML) {                                  
        document.querySelector(".markdown-body").innerHTML
				= newHTML;              
				        MathJax.Hub.Queue(["Typeset", MathJax.Hub]);                                                
																		      });

After these two steps, it should be able to display math.

karenyyng/mathjax-in-instant-markdown-for-vim