/**
* Accessible JavaScript Newsticker
*
* Copyright 2006 Wolfgang Bartelme
* Bartelme Design - http://bartelme.at
*/

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

// Newsticker class ------------------------------------------------------------
customat.bartelme.newsticker = Class.create();
customat.bartelme.newsticker.prototype = {
initialize: function()
{
this.interval           = 10000;
this.container          = $("newsticker");
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);
*/
// Display first message -----------------------------------------------
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-2000);
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(){new customat.bartelme.newsticker()}, false);