gistfile1.rb

require 'johnson'
  require 'johnson/tracemonkey'
  require 'envjs'
  require 'envjs/runtime'
  
  envjs = Johnson::Runtime.new
  envjs.extend Envjs::Runtime
  window = envjs.evaluate("window")
  window.location = 'http://inmateinfo.cityofhenderson.com/Default.aspx'
  
  head = window.document.getElementsByTagName('head')[0]
  script = window.document.createElement('script')
  script.setAttribute('src', 'http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js')
  script.setAttribute('type', 'text/javascript')
  head.appendChild(script)
  envjs.evaluate('jQuery()') #=> [object Object]
  envjs.evaluate("$(':checkbox:first').click()")
  window.document.getElementById("txtSearchName").value = "aa"
  new_window = envjs.evaluate("$('#btnSearch').click()")
  table = envjs.evaluate('window.document.getElementById("gvSearchResults")')
  table.innerHTML