实现aspx页面中，获得焦点，高亮显示，离开时恢复效果（完整代码）

2019-11-17 04:17:00

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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Webapplication1._Default" %>

<!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>Untitled Page</title>
    <style>
        .highlight
        {
            background-color: yellow;
            color: blue;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>

<asp:textbox runat="server" ></asp:textbox>
    </div>
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    </form>
</body>
</html>

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
namespace WebApplication1
{
    public static class Assistant
    {
        public static void SetInputControlsHighlight(Control container, string className, bool onlyTextBoxes)
        {
            foreach (Control ctl in container.Controls)
            {
                if ((onlyTextBoxes && ctl is TextBox) || (!onlyTextBoxes && (ctl is TextBox || ctl is DropDownList || ctl is ListBox || ctl is CheckBox || ctl is RadioButton || ctl is RadioButtonList || ctl is CheckBoxList)))
                {
                    WebControl wctl = ctl as WebControl;
                    wctl.Attributes.Add("onfocus", string.Format(
                       "this.className = '{0}';", className));
                    wctl.Attributes.Add("onBlur", "this.className='';");
                }
                else
                {
                    if (ctl.Controls.Count > 0)
                        SetInputControlsHighlight(ctl, className, onlyTextBoxes);
                }
            }
        }
    }

}

namespace WebApplication1
{
    public partial class _Default : System.Web.UI.Page
    {
        PRotected void Page_Load(object sender, EventArgs e)
        {
            Assistant.SetInputControlsHighlight(this, "highlight", false);
        }
    }
}
http://blog.csdn.net/metababy/archive/2009/04/14/4072424.aspx