Solved

JAVASCRIPT: Needing a Sequential instead of Random Image Replacement Script

Posted on 2008-10-02
1
388 Views
Last Modified: 2012-05-05
The following script swaps the background image randomly when the page is refreshed, how can the script be altered to sequentially cycle thru all the images?


<head>
     <meta http-equiv="content-type" content="text/html; charset=iso-8859-1">
     <title>Random Pictures</title>
     <style type="text/css" title="text/css" media="all">
<!--
#header
{
     position: absolute;
     margin-top: 100px;
     margin-left: 100px;
     width: 468px;
     height: 60px;
     background-image: url(images/pic1.gif);
}
-->
</style>
<script type="text/javascript" language="javascript">
<!--
function swapPic()
     {
     if(document.getElementById)
                 {
                 var thePicture=document.getElementById("header");
                 var picPath="images/pic"+rnd(4)+".gif";
                 thePicture.style.background="url("+picPath+")";
                 }
     }
     
function rnd(n)
     {
     return Math.floor(Math.random() * n) + 1;
     }
     
//-->
</script>
</head>
<body onload="swapPic()">
<div id="header"></div>
 
</body>
</html>

Open in new window

0
Comment
Question by:aztecgreen
1 Comment
 
LVL 75

Accepted Solution

by:
Michel Plungjan earned 350 total points
ID: 22631931
Like this?
<script type="text/javascript" src="cookie.js"></script>
<script type="text/javascript">
var img = getCookie('currentImg');
if (img) img = parseInt(img);
else img=0;
img++;
if (img > 5) img = 1;
setCookie('currentImg',img);
function swapPic() {
  if(!document.getElementById) return; 
  var thePicture=document.getElementById("header");
  var picPath="images/pic"+img+".gif";
  thePicture.style.background="url("+picPath+")";
}
 
</script>
 
You need a cookie.js:
 
// cookie.js file
var cookieToday = new Date(); 
var expiryDate = new Date(cookieToday.getTime() + (365 * 86400000)); // a year
 
/* Cookie functions originally by Bill Dortsch */
 
function setCookie (name,value,expires,path,theDomain,secure) { 
   value = escape(value);
   var theCookie = name + "=" + value + 
   ((expires)    ? "; expires=" + expires.toGMTString() : "") + 
   ((path)       ? "; path="    + path   : "") + 
   ((theDomain)  ? "; domain="  + theDomain : "") + 
   ((secure)     ? "; secure"            : ""); 
   document.cookie = theCookie;
} 
 
function getCookie(Name) { 
   var search = Name + "=" 
   if (document.cookie.length > 0) { // if there are any cookies 
      var offset = document.cookie.indexOf(search) 
      if (offset != -1) { // if cookie exists 
         offset += search.length 
         // set index of beginning of value 
         var end = document.cookie.indexOf(";", offset) 
         // set index of end of cookie value 
         if (end == -1) end = document.cookie.length 
         return unescape(document.cookie.substring(offset, end)) 
      } 
   } 
} 
function delCookie(name,path,domain) {
   if (getCookie(name)) document.cookie = name + "=" +
      ((path)   ? ";path="   + path   : "") +
      ((domain) ? ";domain=" + domain : "") +
      ";expires=Thu, 01-Jan-70 00:00:01 GMT";
}

Open in new window

0

Featured Post

Courses: Start Training Online With Pros, Today

Brush up on the basics or master the advanced techniques required to earn essential industry certifications, with Courses. Enroll in a course and start learning today. Training topics range from Android App Dev to the Xen Virtualization Platform.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Redirection in Javacsript 10 382
Problem to run jar file 4 149
js file for one script block only 4 143
using placeholders where value is empty 3 25
Color can increase conversions, create feelings of warmth or even incite people to get behind a cause. If you want your website to really impact site visitors, then it is vital to consider the impact color has on them.
There’s a good reason for why it’s called a homepage – it closely resembles that of a physical house and the only real difference is that it’s online. Your website’s homepage is where people come to visit you. It’s the family room of your website wh…
This tutorial gives a high-level tour of the interface of Marketo (a marketing automation tool to help businesses track and engage prospective customers and drive them to purchase). You will see the main areas including Marketing Activities, Design …
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

776 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question