MediaWiki:Ticker.js

/*jshint evil:true*/
/*global mw, $*/
var ticker_enabled = true;
var ticker_tl=[]; //Don't touch
var ticker_speed=20; //Increase to slow down, too low makes it go incredibly slow, 15 is about right
var ticker_index=0, ticker_text_pos=0; //Don't touch
var ticker_str_length; //Don't touch
var ticker_contents; //Don't touch

//So people can make there own custom pages outside of the main source (add to this array in special:mypage/monobook.js etc), this will only initilize array if it doesn't already exist.
var ticker_custompages = (ticker_custompages instanceof Array ? ticker_custompages : []);
var ticker_custommsg = (ticker_custommsg instanceof Array ? ticker_custommsg : []);

function ticker_prepare(){
 ticker_str_length=ticker_tl[0].length;
 var content = document.getElementById('showticker').innerHTML;
 if(content !== ""){
  content += "<br/>\n";
 }
 if(ticker_custommsg[wgBasePageName]){
  start = ticker_custommsg[wgBasePageName];
 }
 content += "<div id='ticker_content' style='font-size: 120%; font-color: blue; display: inline;'></div>";
 document.getElementById('showticker').innerHTML = content;
}

var wgBasePageName = mw.config.get('wgPageName');
if(mw.config.get('wgPageName').indexOf("/") != -1){
 wgBasePageName = mw.config.get('wgPageName').substring(0,mw.config.get('wgPageName').indexOf("/"));
}

var ticker_toload = "";

function ticker_load(){
 // can be set to false in a user's custom js file
 if( !ticker_enabled || ! $( '#showticker' ).length ){
  return;
 }
 ticker_toload = "Wikinews:Tickersource/Tickersource";
 if(ticker_custompages[wgBasePageName]){
  ticker_toload = ticker_custompages[wgBasePageName];
 }
 var xmlhttp = sajax_init_object();
 xmlhttp.overrideMimeType('text/xml');
 xmlhttp.open( 'GET' , mw.util.getUrl( ticker_toload, { 'action': 'render' } ), true);
 xmlhttp.onload = function() {
  //this.responseXML is the DOM
  var entries = this.responseText.split("\n");
  //window.alert(this.responseText);
  for(var i = 0; i < entries.length; i++){
   var val = entries[i];
   if(val.indexOf("<li>") === 0 && val.indexOf("<a") != -1){
    val = val.substring(val.indexOf("\">")+2, val.indexOf("</a>"));
    ticker_tl[ticker_tl.length] = val;
   }
  }
  ticker_prepare();
  ticker_tick(false, true);
 };
 xmlhttp.send( null );
}

function ticker_tick(reset, first)
{
  if(reset){
    document.getElementById("ticker_content").innerHTML = "";
  }
  if(first){
   ticker_index = Math.floor(Math.random() * ticker_tl.length);
   ticker_text_pos=0;
   ticker_str_length=ticker_tl[ticker_index].length;
  }
  ticker_contents='';
  //window.alert("TL: "+ticker_tl[ticker_index]);
  document.getElementById("ticker_content").innerHTML = ("<a href=\"" + mw.util.getUrl( ticker_tl[ticker_index] ) + "\" title=\"" + mw.html.escape( ticker_tl[ticker_index] ) + "\">" + ticker_tl[ticker_index].substring(0,ticker_text_pos) + "_</a>").replace("\n", "");
  if(ticker_text_pos++>=ticker_str_length)
  {
    ticker_index++;
    if(ticker_index<ticker_tl.length)
    {
      ticker_text_pos=0;
      ticker_str_length=ticker_tl[ticker_index].length;
      if(first){
       setTimeout("ticker_tick(true, false)",3);
      }else{
       setTimeout("ticker_tick(true, false)",7000);
      }
    }else{
      ticker_index = Math.floor(Math.random() * ticker_tl.length);
      ticker_text_pos=0;
      ticker_str_length=ticker_tl[ticker_index].length;
      setTimeout("ticker_tick(true, false)",7000);
    }
  } else
    setTimeout("ticker_tick(false, false)",ticker_speed);
 
}

function sajax_init_object() {
	var A;
	try {
		// Try the new style before ActiveX so we don't
		// unnecessarily trigger warnings in IE 7 when
		// set to prompt about ActiveX usage
		A = new XMLHttpRequest();
	} catch (e) {
		try {
			A=new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				A=new ActiveXObject("Microsoft.XMLHTTP");
			} catch (oc) {
				A=null;
			}
		}
	}

	return A;
}

// Disables for IE, AJAX etc is really bugged in IE, wont work without major rewrite and server-side extension.
if(navigator.userAgent.indexOf("MSIE") == -1){

$(ticker_load);

}