The very first time the page is loaded a dynamic list of randomly selected urls is created from the main array (my_array) and the link set to go to the first url in the list.
When the page is reloaded the link is automatically set to go to the next url in this list
Once all the urls have been used a new dynamic list of urls is created.
A cookie is used to save the current list of randomly selected urls and the variable count, when the page is reloaded the current list is recreated, the variable count keeps track on which url is next and sets the link to suit.
Please try the following
<HTML>
<HEAD>
<TITLE>Document Title</TITLE>
<SCRIPT language=javascript>
<!--
// Realised by apachejeff
//www.huntingground.freeserve.co.uk
my_array=new Array()
my_array[0]="arc.htm"
my_array[1]="array.htm"
my_array[2]="clock.htm"
my_array[3]="url 4"
my_array[4]="url 5"
my_array[5]="url 6"
my_array[6]="url 7"
my_array[7]="url 8"
my_array[8]="url 9"
my_array[9]="url 10"
total_range=my_array.length // numbers range to select from
how_many=my_array.length // how many to select
function generate(){
total=total_range-1
oselect=how_many
numbers_range=new Array() // array to hold numbers to select from.
selected_num=new Array() // array to hold selected numbers
for(n=0;n<total+1;n++){ // create list of numbers to choose from
numbers_range[n]=n // start of numbers to choose from
}
for(p=0;p<oselect;p++){ // generate a random number for oselect times
rndnum=Math.round(Math.random()*(total))
selected_num[p]=numbers_range.splice(rndnum,1) // add to selected_num array and remove from numbers_range array
total--
}
show_selected_number()
}
count=0
function show_selected_number(){
if(count==selected_num.length){
count=0
generate()
return
}
document.getElementById("lnk1").href=my_array[selected_num[count]]
document.getElementById("lnk1").innerHTML=my_array[selected_num[count]]
count++
}
cookie_name="random_urls"
expdays=365
// An adaptation of Dorcht's cookie functions.
function set_cookie(name, value, expires, path, domain, secure){
if (!expires){expires = new Date()}
document.cookie = name + "=" + escape(value) +
((expires == null) ? "" : "; expires=" + expires.toGMTString()) +
((path == null) ? "" : "; path=" + path) +
((domain == null) ? "" : "; domain=" + domain) +
((secure == null) ? "" : "; secure");
}
function get_cookie(name) {
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen) {
var j = i + alen;
if (document.cookie.substring(i, j) == arg){
return get_cookie_val(j);
}
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}
function get_cookie_val(offset){
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}
function delete_cookie(name,path,domain){
document.cookie = name + "=" +
((path == null) ? "" : "; path=" + path) +
((domain == null) ? "" : "; domain=" + domain) +
"; expires=Thu, 01-Jan-00 00:00:01 GMT";
}
function save_data_to_cookie(){
var expdate = new Date ();
expdate.setTime (expdate.getTime() + (expdays*24*60*60*1000)); // expiry date
path=null // path="/" top directory, path=null this documents root directory
data=selected_num+","+count
set_cookie(cookie_name,data,expdate,path)
}
function get_cookie_data(){
inf=get_cookie(cookie_name)
if(!inf){
generate()
return
}
cookie_data=inf
cookie_data=cookie_data.split(",")
selected_num=new Array()
for(i=0;i<cookie_data.length-1;i++){
selected_num[i]=cookie_data[i]
}
count=cookie_data[cookie_data.length-1]
show_selected_number()
}
// -->
</SCRIPT>
</HEAD>
<BODY onload="get_cookie_data()" onunload="save_data_to_cookie()"><h1>Random urls</h1>
<center>
<a id="lnk1" href=http://www.codingforums.com/archive/index.php/"#null">Link</A>
</center>
</BODY>
</HTML>
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