Post JS errors to server

post_js_errors.js

window.onerror = function(msg, url, line) { 
  message = 'Javascript error: *' + msg + '* (' + url + ':' + line + ') for session: *' + getCookie('session_code') + '*'
  $.post('/alerts', {
      message: message
    },
    function() { console.log('Successfully reported error') }
  )
}

Backend component: https://gist.github.com/feifanzhou/f4719513faa76bf6fd2a

session_code is a cookie that refers to the token for tracking logged in users. Useful to determine who hit the error