From 1a22fb59c944aee70c968688dc0440596670076b Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Thu, 7 Apr 2005 06:43:21 +0000
Subject: Added JavascriptHelper#periodically_call_remote in order to create
 areas of a page that update automatically at a set interval #945 [Jon Tirsen]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1108 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 .../action_view/helpers/javascripts/prototype.js   | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'actionpack/lib/action_view/helpers/javascripts')

diff --git a/actionpack/lib/action_view/helpers/javascripts/prototype.js b/actionpack/lib/action_view/helpers/javascripts/prototype.js
index 5dc41e36dd..1ab50882c4 100644
--- a/actionpack/lib/action_view/helpers/javascripts/prototype.js
+++ b/actionpack/lib/action_view/helpers/javascripts/prototype.js
@@ -613,3 +613,32 @@ Effect.Appear.prototype = {
   }
 }
 
+/*--------------------------------------------------------------------------*/
+
+PeriodicalExecuter = Class.create();
+PeriodicalExecuter.prototype = {
+  initialize: function(what, frequency) {
+    this.what = what;
+    this.frequency = frequency;
+    this.currentlyExecuting = false;
+    
+    this.registerCallback();
+  },
+  
+  registerCallback: function() {
+    setTimeout(this.onTimerEvent.bind(this), this.frequency * 1000);
+  },
+  
+  onTimerEvent: function() {
+    if (!this.currentlyExecuting) {
+      try { 
+        this.currentlyExecuting = true;
+        this.what(); 
+      } finally { 
+        this.currentlyExecuting = false;
+      }
+    }
+    
+    this.registerCallback();
+  }
+}
-- 
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