reloader.coffee

class @Reloader
  constructor: (@selector = '.wrapper', @path, @interval = 2000) ->
    @start()

  start: =>
    @timer = setInterval(@fetch, @interval)

  stop: =>
    clearInterval(@timer)

  fetch: =>
    $.get(@path).done(@render)

  render: (data) =>
    $body = $(@parseBody(data))

    if @selector is 'body'
      $el = $body
    else
      $el = @findAll($body, @selector)

    $(@selector).replaceWith($el)

  parseHTML: (html) =>
    $.parseHTML(html, document, false)

  parseBody: (data) =>
    @parseHTML(data.match(/<body[^>]*>([\s\S.]*)<\/body>/i)[0])

  findAll: ($elems, selector) ->
    $elems.filter(selector).add($elems.find(selector))

reloader.js

// Generated by CoffeeScript 1.8.0
(function() {
  var __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };

  this.Reloader = (function() {
    function Reloader(selector, path, interval) {
      this.selector = selector != null ? selector : '.wrapper';
      this.path = path;
      this.interval = interval != null ? interval : 2000;
      this.parseBody = __bind(this.parseBody, this);
      this.parseHTML = __bind(this.parseHTML, this);
      this.render = __bind(this.render, this);
      this.fetch = __bind(this.fetch, this);
      this.stop = __bind(this.stop, this);
      this.start = __bind(this.start, this);
    }

    Reloader.prototype.start = function() {
      return this.timer = setInterval(this.fetch, this.interval);
    };

    Reloader.prototype.stop = function() {
      return clearInterval(this.timer);
    };

    Reloader.prototype.fetch = function() {
      return $.get(this.path).done(this.render);
    };

    Reloader.prototype.render = function(data) {
      var $body, $el;
      $body = $(this.parseBody(data));
      if (this.selector === 'body') {
        $el = $body;
      } else {
        $el = this.findAll($body, this.selector);
      }
      return $(this.selector).replaceWith($el);
    };

    Reloader.prototype.parseHTML = function(html) {
      return $.parseHTML(html, document, false);
    };

    Reloader.prototype.parseBody = function(data) {
      return this.parseHTML(data.match(/<body[^>]*>([\s\S.]*)<\/body>/i)[0]);
    };

    Reloader.prototype.findAll = function($elems, selector) {
      return $elems.filter(selector).add($elems.find(selector));
    };

    return Reloader;

  })();

}).call(this);