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POHow to prevent the Focus() method from scrolling the page to the top
 

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  1. POHow to prevent the Focus() method from scrolling the page to the top
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    <p>I have set of textboxes in a gridview and I use the <code>Focus()</code> method to restore the focus after losing to the intended text box. The problem is :</p> <p>The page (scrollable) and when I call the Focus method, in the text changed event, the page jump to the top. It's such a confusing behavior.</p> <p>My question is:</p> <p>Is there some way to prevent the <code>Focus()</code> method from jumping the page to the top?</p> <p>My code:</p> <pre><code>protected void txt_evaluateWeights_TextChanged(object sender, EventArgs e) { calc(); int index = ((System.Web.UI.WebControls.GridViewRow)(((RadTextBox)sender).Parent.NamingContainer)).DataItemIndex; ((RadTextBox)gv_Evaluation.Rows[index + 1].Cells[3].FindControl("txt_evaluateWeights")).Focus();//Here is the problem. } </code></pre> <p><strong>Note:</strong> </p> <ul> <li><p>I use the <code>asp:TextBox</code>, and the same problem.</p></li> <li><p>My grid view in an update panel</p></li> </ul> <hr> <p><strong>EDIT :</strong></p> <p><strong>Javascript workaround:</strong></p> <pre><code>var lastFocusedControlId = ""; function focusHandler(e) { document.activeElement = e.originalTarget; } function appInit() { if (typeof (window.addEventListener) !== "undefined") { window.addEventListener("focus", focusHandler, true); } Sys.WebForms.PageRequestManager.getInstance().add_pageLoading(pageLoadingHandler); Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(pageLoadedHandler); } function pageLoadingHandler(sender, args) { lastFocusedControlId = typeof (document.activeElement) === "undefined" ? "" : document.activeElement.id; } function focusControl(targetControl) { if (Sys.Browser.agent === Sys.Browser.InternetExplorer) { var focusTarget = targetControl; if (focusTarget &amp;&amp; (typeof (focusTarget.contentEditable) !== "undefined")) { oldContentEditableSetting = focusTarget.contentEditable; focusTarget.contentEditable = false; } else { focusTarget = null; } try { targetControl.focus(); if (focusTarget) { focusTarget.contentEditable = oldContentEditableSetting; } } catch (err) { } } else { targetControl.focus(); } } function pageLoadedHandler(sender, args) { if (typeof (lastFocusedControlId) !== "undefined" &amp;&amp; lastFocusedControlId != "") { var newFocused = $get(lastFocusedControlId); if (newFocused) { focusControl(newFocused); } } } Sys.Application.add_init(appInit); </code></pre>
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