What is the best way to preserve the scroll position of a page even when an iframe is being used and a text box is

On my website, I have an iframe control within an update panel that refreshes every 4 seconds and sets focus to a specific textbox within the iframe. However, this causes the scroll position of the page to change each time. I have tried using the MaintainScrollpositononPostBack option and the following JavaScript code to address this issue:

function scroll()
      {
      var obj = document.getElementById("Form1"); 
      obj.scrollTop = obj.scrollHeight;
      }

Could someone please provide guidance on how to resolve this problem?

Thank you in advance.

c#javascriptasp.netajax

Answer №1

To prevent the text box from changing the scroll position, it's best not to give it focus when it is updated. This way, the scroll position will remain unchanged unless some part of your code still insists on focusing on an element outside of view.

However, if you do need to set focus on the text box upon update, you can save the current scroll position and then restore it afterwards.

var doc = document.documentElement, body = document.body;
var left = (doc && doc.scrollLeft || body && body.scrollLeft || 0);
var top = (doc && doc.scrollTop  || body && body.scrollTop  || 0);

//code to update your text box and set focus here

window.scrollTo(left, top);

Answer №2

Take a look at the code provided in the following link:

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