TextBox 添加默认提示信息以及底色 ，当鼠标点击后清空默认提示信息，当鼠标移开去底色
aspx页面：
前台代码：
<head>
<style type="text/css">
/*input*/
.input_on{
padding:2px 8px 0pt 3px;
height:18px;
border:1px solid #999;
background-color:#FFFFCC;
}
.input_off{
padding:2px 8px 0pt 3px;
height:18px;
border:1px solid #CCC;
background-color:#FFF;
}
.input_move{
padding:2px 8px 0pt 3px;
height:18px;
border:1px solid #999;
background-color:#FFFFCC;
}
.input_out{
/*height:16px;默认高度*/
padding:2px 8px 0pt 3px;
height:18px;
border:1px solid #CCC;
background-color:#FFF;
}
/*form*/
</style>
</head>
<body>
<form runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server" CssClass="input_out" ></asp:TextBox>
</div>
后台代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
TextBox1.Attributes.Add("Value", "请输入关键字");
TextBox1.Attributes.Add("OnFocus", "this.value='';this.className='input_on';this.onmouseout='';");
TextBox1.Attributes.Add("OnBlur", "if(!value){value=defaultValue;};this.className='input_off';this.onmouseout=function(){this.className='input_out'};");
TextBox1.Attributes.Add("onmousemove", "this.className='input_move'");
TextBox1.Attributes.Add("onmouseout", "this.className='input_out'");
}
}
