application.js

// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
// or vendor/assets/javascripts of plugins, if any, can be referenced here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// the compiled file.
//
// WARNING: THE FIRST BLANK LINE MARKS THE END OF WHAT'S TO BE PROCESSED, ANY BLANK LINE SHOULD
// GO AFTER THE REQUIRES BELOW.
//
//= require jquery
//= require jquery_ujs
//= require_tree .
//= require twitter/bootstrap

$(document).ready(function(e){

  var text = $(".markdown-preview").val();

  var converter = new Showdown.converter();
  var html = converter.makeHtml(text);

  //alert(html);

  $($(".markdown-preview").attr("data-target")).html(html);

});

$(".markdown-preview").keyup(function(e){
  
   var text = $(this).val();

   var converter = new Showdown.converter();
   var html = converter.makeHtml(text);

   //alert(html);
  
  $($(this).attr("data-target")).html(html);
});