使用母版页，Ajax UpdatePanel包含的下拉框，点击下拉框PostBack之后focus不奏效，第二次点击下拉框PostBack之后focus奏效？？？？
JS
function resetFocus(id){
var obj=document.getElementById(id);
if(obj) obj.focus();
}
C#
ScriptManager.RegisterStartupScript(this, this.GetType(), "resetFocusJS", "resetFocus(\"" + ddlRegion.ClientID + "\");", true);
------------------------------
<%@ Master Language="C#" AutoEventWireup="true" CodeFile="TESTPAGE.master.cs" Inherits="TESTPAGE" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
<script language="javascript" type="text/javascript">
function resetFocus(id){
var obj=document.getElementById(id);
if(obj) obj.focus();
//document.getElementById(id).select();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<asp:contentplaceholder id="ContentPlaceHolder1" runat="server">
</asp:contentplaceholder>
</div>
</form>
</body>
</html>
------------------------------
<%@ Page Language="C#" MasterPageFile="~/TESTPAGE.master" AutoEventWireup="true" CodeFile="test2.aspx.cs" Inherits="test2" Title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
Region:
<asp:DropDownList runat="server" ID="ddlRegion" DataValueField="Region_Id" DataTextField="Name"
AutoPostBack="true" OnSelectedIndexChanged="ddlRegion_SelectedIndexChanged">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
</asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>
</asp:Content>
------------------------------
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class test2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void ddlRegion_SelectedIndexChanged(object sender, EventArgs e)
{
ScriptManager.RegisterStartupScript(this, this.GetType(), "ResetFilter", "resetFocus(\"" + ddlRegion.ClientID + "\"); ", true);
}
}
------------------------------
Solution:
ScriptManager.RegisterStartupScript(UpdatePanel1, typeof(UpdatePanel), "fuck", "setTimeout(\"document.all('ctl00$ContentPlaceHolder1$ctl01$Jbyj').focus();\",100);", true);
注：Firefox不需要额外控制焦点，自动保留焦点在最后操作的控件上。
http://blog.sina.com.cn/s/blog_4473b2d10100arg5.html
http://www.cnblogs.com/njnudt/archive/2008/11/18/1335948.html