Javascript page reload while maintaining current window position

Question

How do I refresh the page using Javascript without the page returning to the top.

My page refreshes using a timer but the problem is it goes back to the top every ti

Answer 1

If you use JavaScript, this code will do the trick.

var cookieName = "page_scroll";
var expdays = 365;

// An adaptation of Dorcht's cookie functions.

function setCookie(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 getCookie(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 getCookieVal(j);
        }
        i = document.cookie.indexOf(" ", i) + 1;
        if (i == 0) break;
    }
    return null;
}

function getCookieVal(offset) {
    var endstr = document.cookie.indexOf(";", offset);
    if (endstr == -1) endstr = document.cookie.length;
    return unescape(document.cookie.substring(offset, endstr));
}

function deleteCookie(name, path, domain) {
    document.cookie = name + "=" +
        ((path   == null) ? "" : "; path=" + path) +
        ((domain == null) ? "" : "; domain=" + domain) +
        "; expires=Thu, 01-Jan-00 00:00:01 GMT";
}

function saveScroll() {
    var expdate = new Date();
    expdate.setTime(expdate.getTime() + (expdays*24*60*60*1000)); // expiry date

    var x = document.pageXOffset || document.body.scrollLeft;
    var y = document.pageYOffset || document.body.scrollTop;
    var data = x + "_" + y;
    setCookie(cookieName, data, expdate);
}

function loadScroll() {
    var inf = getCookie(cookieName);
    if (!inf) { return; }
    var ar = inf.split("_");
    if (ar.length == 2) {
        window.scrollTo(parseInt(ar[0]), parseInt(ar[1]));
    }
}

This works by using a cookie to remember the scroll position.

Now just add

onload="loadScroll()" onunload="saveScroll()"

to your body tag and all will be well.

Source(s): http://www.huntingground.freeserve.co.uk/main/mainfram.htm?../scripts/cookies/scrollpos.htm