/* LSA bewoners
 * newsticker javascript
 * Original by: BartelMe Newsticker
 * @version: $Id: newsticker.js 7919 2009-02-04 10:26:14Z rutger $
 */


// Create namespace
if (at == undefined) var at = {};
if (at.bartelme == undefined) at.bartelme = {};

// Newsticker Class
at.bartelme.newsticker = Class.create();
at.bartelme.newsticker.prototype = {
   initialize: function()
   {
      // Get elements
      this.interval = 6000;
      this.container = $("kanwelNieuws");
      this.messages  = $A(this.container.getElementsByTagName("li"));
      this.number_of_messages = this.messages.length;
      if (this.number_of_messages == 0)
      {
         this.showError();
         return false;
      }
      this.current_message = 0;
      this.previous_message = null;

/*
      // Create toggle button
      this.toggle_button = document.createElement("a");
      this.toggle_button.href = "#";
      this.toggle_button.id = "togglenewsticker";
      this.toggle_button.innerHTML = "Toggle";
      Event.observe(this.toggle_button, "click", this.toggle.bindAsEventListener(this), false);
      this.container.appendChild(this.toggle_button);
      */
      this.hideMessages();
      this.showMessage();
      // Install timer
      this.timer = setInterval(this.showMessage.bind(this), this.interval);
   },
   showMessage: function()
   {
      Effect.Appear(this.messages[this.current_message]);
      setTimeout(this.fadeMessage.bind(this), this.interval-1000);
      if (this.current_message < this.number_of_messages-1)
      {
         this.previous_message = this.current_message;
         this.current_message = this.current_message + 1;
      } else {
         this.current_message = 0;
         this.previous_message = this.number_of_messages - 1;
      }
   },
   fadeMessage: function()
   {
      Effect.Fade(this.messages[this.previous_message]);
   },
   hideMessages: function()
   {
      this.messages.each(function(message)
      {
//       Element.hide(message);
      })
   },
/* toggle: function()
   {
      Effect.BlindUp(this.container, 1000);
   },*/
   showError: function()
   {
      if (this.container.getElementsByTagName("ul").length == 0)
      {
         this.list = document.createElement("ul");
         this.container.appendChild(this.list);
      } else {
         this.list = this.container.getElementsByTagName("ul")[0];
      }
      this.errorMessage = document.createElement("li");
      this.errorMessage.className = "error";
      this.errorMessage.innerHTML = "Could not retrieve data";
      this.list.appendChild(this.errorMessage);
   }
}

Event.observe(window,'load',function(){
   if ($("kanwelNieuws")){
      new at.bartelme.newsticker();
      //Event.observe(window, "load", function(){new at.bartelme.newsticker()}, false);
   }
});