CODEWITHSUNDEEP
asp.netjavascript
Dkong
Dkong

Reputation: 2788

Maintain scroller position on Div after page postback (ASP.NET)

I have a div as such:

<div style="overflow-y: scroll; height: 260px">

I contains a few hundred records and allows me to select an item to populate a formview control below it.

The problem is that when the page posts-back, the scroller position goes back to the top of the div. I want to try and maintain its position so that the selected record is still visible.

Any ideas?

Upvotes: 10

Views: 29254

Answers (7)

Ravi Sharma
Ravi Sharma

Reputation: 370

<asp:HiddenField ID="hfScroll" runat="server" ClientIDMode="Static" />

<script>
        $(document).ready(function () {
            ScrollMaintain();
            $(window).scroll(function () {
                $('#hfScroll').val($(window).scrollTop());
            });

        function ScrollMaintain() {
            var scroll = $('#hfScroll').val();
            scroll = (scroll == '' ? '0' : scroll);
            $(window).scrollTop(scroll);
        }
    </script>

Upvotes: 0

Myke Black
Myke Black

Reputation: 1339

Tried all of the above and none of them worked satisfactorily in chrome v39, however the method used on this page worked marvellously:

Maintain Scroll Position of DIV on PostBack in ASP.Net

Upvotes: 1

FlySwat
FlySwat

Reputation: 175733

Place something like:

 <asp:HiddenField id="hdnScrollPos" runat="server"/> in your aspx.

Then, some javascript like:

var hdnScroll = document.getElementById(<%=hdnScrollPos.ClientID%>);
var bigDiv = document.getElementById('bigDiv');
bigDiv.onscroll = function() {
     hdnScroll.value = bigDiv.scrollTop;
}

window.onload = function () { 
    bigDiv.scrollTop = hdnScroll.value;
}

Upvotes: 12

mangokun
mangokun

Reputation: 5633

Replace thebody with document.getElementById("divTest")

If you worry that the onscroll event does not work in opera/ff, you can try changing 

thebody.onscroll=SaveScrollLocation;

to

setInterval('SaveScrollLocation()", 500);

Upvotes: 1

LinkedWith
LinkedWith

Reputation: 41

Here is a more refined way of FlySwat's solution using JQuery which worked for me:

    var $ScrollPosition = $('#hfScrollPosition');
    var $ScrollingDiv = $('#pnlGroupDataContent');
    if ($ScrollPosition.length && $ScrollingDiv.length) {
        // Store scrolling value
        $ScrollingDiv.scroll(function () {
            $ScrollPosition.val($ScrollingDiv.scrollTop());
        });
        // Set scrolling
        $ScrollingDiv.scrollTop($ScrollPosition.val());
    }

Upvotes: 3

simpleblue
simpleblue

Reputation:

ASP.NET has this built in all you need to do is include the MaintainScrollPositionOnPostback in your page directive.

<%@ Page Language="C#" MaintainScrollPositionOnPostback="true" %>

Upvotes: 1

Dan Diplo
Dan Diplo

Reputation: 25359

Disclaimer - not my code, but I've seen this used before:

window.onload = function(){
    var strCook = document.cookie;
    if(strCook.indexOf("!~")!=0){
      var intS = strCook.indexOf("!~");
      var intE = strCook.indexOf("~!");
      var strPos = strCook.substring(intS+2,intE);

      document.getElementById("divTest").scrollTop = strPos;
      document.getElementById("divTest").scrollTop = strPos;
    }
  }
  function SetDivPosition(){
    var intY = document.getElementById("divTest").scrollTop;

    document.cookie = "yPos=!~" + intY + "~!";
  }

The idea is to store the position of the scrollbar in a cookie. Another (better?) option would be to store it in a hidden field (or fields). Hope that gets you going...

Upvotes: 1

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