How to keep whole page scroll position after asynchronous postback

Question

i am using asp.net 4.0 iis 7.5 microsoft visual studio 2010

what i want is keep whole page (browser) scroll position (not a div or panel) when asynchronous postback

Answer 1

I found it here :http://forums.asp.net/t/1300961.aspx

just add it right after script manager. it works for me in all browsers

<script type="text/javascript">
    var prm = Sys.WebForms.PageRequestManager.getInstance();
    prm.add_beginRequest(beginRequest);
    function beginRequest()
    {
        prm._scrollPosition = null;
    }
</script>

Answer 2

asp.net has @page directive property called MaintainScrollPositionOnPostBack

hope this will help

Answer 3

You can do it the client way :

$(document).ready(function () {
    $(window).on('beforeunload', function () {
        document.cookie = "keepscroll=" + $(window).scrollTop();
    });
    var cs = document.cookie ? document.cookie.split(';') : [];
    var i = 0, cslen = cs.length;
    for (; i < cs.length; i++) {
        var c = cs[i].split('=');
        if (c[0].trim() == "keepscroll") {
            $(window).scrollTop(parseInt(c[1]));
            break;
        }
    }
});

If you are not jQuery's friend then you could try something like :

window.onbeforeunload = function () {
    document.cookie = "keepscroll=" + document.body.scrollTop;
};
var keepscroll = window.setTimeout(function () {
    var cs = document.cookie ? document.cookie.split(';') : [];
    var i = 0, cslen = cs.length;
    for (; i < cs.length; i++) {
        var c = cs[i].split('=');
        if (c[0].trim() == "keepscroll") {
            window.scrollTo(0, parseInt(c[1]));
            break;
        }
    }
    window.clearTimeout(keepscroll);
    keepscroll = null;
}, 100);