https://goldenageproject.org.uk/scripts/ajaxticker.js

1// -------------------------------------------------------------------
2// Ajax XML Ticker (txt file source)
3// Author: Dynamic Drive (http://www.dynamicdrive.com)
4// -------------------------------------------------------------------
5
6////////////No need to edit beyond here//////////////
7
8function createAjaxObj(){
9var httprequest=false
10if (window.XMLHttpRequest){ // if Mozilla, Safari etc
11httprequest=new XMLHttpRequest()
12if (httprequest.overrideMimeType)
13httprequest.overrideMimeType('text/xml')
14}
15else if (window.ActiveXObject){ // if IE
16try {
17httprequest=new ActiveXObject("Msxml2.XMLHTTP");
18} 
19catch (e){
20try{
21httprequest=new ActiveXObject("Microsoft.XMLHTTP");
22}
23catch (e){}
24}
25}
26return httprequest
27}
28
29// -------------------------------------------------------------------
30// Main Ajax Ticker Object function
31// ajax_ticker(xmlfile, divId, divClass, delay, optionalfadeornot)
32// -------------------------------------------------------------------
33
34function ajax_ticker(xmlfile, divId, divClass, delay, fadeornot){
35this.xmlfile=xmlfile //Variable pointing to the local ticker xml file (txt)
36this.tickerid=divId //ID of ticker div to display information
37this.delay=delay //Delay between msg change, in miliseconds.
38this.mouseoverBol=0 //Boolean to indicate whether mouse is currently over ticker (and pause it if it is)
39this.pointer=0
40this.opacitystring=(typeof fadeornot!="undefined")? "width: 100%; filter:progid:DXImageTransform.Microsoft.alpha(opacity=100); -moz-opacity: 1" : ""
41if (this.opacitystring!="") this.delay+=500 //add 1/2 sec to account for fade effect, if enabled
42this.opacitysetting=0.2 //Opacity value when reset. Internal use.
43this.messages=[] //Arrays to hold each message of ticker
44this.ajaxobj=createAjaxObj()

45document.write('<div id="'+divId+'" class="'+divClass+'"><div style="'+this.opacitystring+'">Initializing ticker...</div></div>')
46this.getXMLfile()
47}
48
49// -------------------------------------------------------------------
50// getXMLfile()- Use Ajax to fetch xml file (txt)
51// -------------------------------------------------------------------
52
53ajax_ticker.prototype.getXMLfile=function(){
54if (this.ajaxobj){
55var instanceOfTicker=this
56var url=this.xmlfile+"?bustcache="+new Date().getTime()
57this.ajaxobj.onreadystatechange=function(){instanceOfTicker.initialize()}
58this.ajaxobj.open('GET', url, true)
59this.ajaxobj.send(null)
60}
61}
62
63// -------------------------------------------------------------------
64// initialize()- Initialize ticker method.
65// -Gets contents of xml file and parse it using JavaScript DOM methods 
66// -------------------------------------------------------------------
67
68ajax_ticker.prototype.initialize=function(){ 
69if (this.ajaxobj.readyState == 4){ //if request of file completed
70if (this.ajaxobj.status==200 || window.location.href.indexOf("http")==-1){ //if request was successful
71this.contentdiv=document.getElementById(this.tickerid).firstChild //div of inner content that holds the messages
72var xmldata=this.ajaxobj.responseText
73this.contentdiv.style.display="none"
74this.contentdiv.innerHTML=xmldata
75if (this.contentdiv.getElementsByTagName("div").length==0){ //if no messages were found
76this.contentdiv.innerHTML="<b>Error</b> fetching remote ticker file!"
77return
78}
79var instanceOfTicker=this
80document.getElementById(this.tickerid).onmouseover=function(){instanceOfTicker.mouseoverBol=1}
81document.getElementById(this.tickerid).onmouseout=function(){instanceOfTicker.mouseoverBol=0}
82if (window.attachEvent) //Clean up loose references in IE
83window.attachEvent("onunload", function(){instanceOfTicker.contentdiv=instanceOfTicker.ajaxobj=null})
84//Cycle through XML object and store each message inside array
85for (var i=0; i<this.contentdiv.getElementsByTagName("div").length; i++){
86if (this.contentdiv.getElementsByTagName("div")[i].className=="message")
87this.messages[this.messages.length]=this.contentdiv.getElementsByTagName("div")[i].innerHTML
88}
89this.contentdiv.innerHTML=""
90this.contentdiv.style.display="block"
91this.rotatemsg()
92}
93}
94}
95
96// -------------------------------------------------------------------
97// rotatemsg()- Rotate through ticker messages and displays them
98// -------------------------------------------------------------------
99
100ajax_ticker.prototype.rotatemsg=function(){
101var instanceOfTicker=this
102if (this.mouseoverBol==1) //if mouse is currently over ticker, do nothing (pause it)
103setTimeout(function(){instanceOfTicker.rotatemsg()}, 100)
104else{ //else, construct item, show and rotate it!
105this.fadetransition("reset") //FADE EFFECT- RESET OPACITY
106this.contentdiv.innerHTML=this.messages[this.pointer]
107this.fadetimer1=setInterval(function(){instanceOfTicker.fadetransition('up', 'fadetimer1')}, 100) //FADE EFFECT- PLAY IT
108this.pointer=(this.pointer<this.messages.length-1)? this.pointer+1 : 0
109setTimeout(function(){instanceOfTicker.rotatemsg()}, this.delay) //update container periodically
110}
111}
112
113// -------------------------------------------------------------------
114// fadetransition()- cross browser fade method for IE5.5+ and Mozilla/Firefox
115// -------------------------------------------------------------------
116
117ajax_ticker.prototype.fadetransition=function(fadetype, timerid){
118var contentdiv=this.contentdiv
119if (fadetype=="reset")
120this.opacitysetting=0.2
121if (contentdiv.filters && contentdiv.filters[0]){
122if (typeof contentdiv.filters[0].opacity=="number") //IE6+
123contentdiv.filters[0].opacity=this.opacitysetting*100
124else //IE 5.5
125contentdiv.style.filter="alpha(opacity="+this.opacitysetting*100+")"
126}
127else if (typeof contentdiv.style.MozOpacity!="undefined" && this.opacitystring!=""){
128contentdiv.style.MozOpacity=this.opacitysetting
129}
130else
131this.opacitysetting=1
132if (fadetype=="up")
133this.opacitysetting+=0.1
134if (fadetype=="up" && this.opacitysetting>=1)
135clearInterval(this[timerid])
136}