Issue #77: De-couple behavior helper from router and template

- Refactor the keepalive helper method to use jQuery and default to window.location.url
- Add a 'url' config option to set a custom url to call
- Use head requests and do not use cache

code/template/helper/behavior.php

@@ -279,14 +279,16 @@ public function validator($config = array())
  * @param array $config An optional array with configuration options
  * @return string The html output
  */
- public function keepalive($config = array(), TemplateInterface $template)
+ public function keepalive($config = array())
  {
  $config = new ObjectConfigJson($config);
  $config->append(array(
  'refresh' => 15 * 60000, //default refresh is 15min
- 'url' => $template->route('', false, false),
+ 'url' => '',  //default to window.location.url
  ));
+
  $html = '';
+
  // Only load once
  if (!isset(self::$_loaded['keepalive']))
  {
@@ -306,14 +308,29 @@ public function keepalive($config = array(), TemplateInterface $template)
  $refresh = 3600000;
  }
 
+ if(empty($config->url)) {
+ $url = 'window.location.url';
+ } else {
+ $url = "'.$config->url.'";
+ }
+
  // Build the keep alive script.
+ //See: https://stackoverflow.com/questions/5052543/how-to-fire-ajax-request-periodically
  $html =
  "<script>
- Kodekit.keepalive = function() {
- var request = new Request({method: 'get', url: '" . $config->url . "'}).send();
- }
- window.addEvent('domready', function() { Kodekit.keepalive.periodical('" . $refresh . "'); });
- </script>";
+ (function keepalive(){
+ kQuery(function($) {
+ $.ajax({
+ url: $url,
+ method: 'HEAD',
+ cache: false,
+ complete: function() {
+ // Schedule the next request when the current one's complete
+ setTimeout(keepalive, '" . $refresh . "');
+ }
+ })
+ });
+ })();</script>";
 
  self::$_loaded['keepalive'] = true;
  }
@@ -383,7 +400,7 @@ public function autocomplete($config = array())
  'validate' => false, //Toggle if the forms validation helper is loaded
  'queryVarName' => 'search',
  'width' => 'resolve',
- 'model'  => $config->model,
+ 'model'  => $config->model,
  'placeholder' => $config->prompt,
  'allowClear' => $config->deselect,
  'value' => $config->value,
@@ -405,8 +422,7 @@ public function autocomplete($config = array())
  }
 
  $config->options->url->setQuery(array('fields' => $config->value.','.$config->text), true);
-
- $config->options->url = (string)$config->options->url;
+ $config->options->url = (string) $config->options->url;
 
  $options = $config->options;
  $signature = md5('autocomplete-'.$config->element.$options);