文本框获取和失去焦点默认值问题

1. HTML控件<input id="txtName" type="text" value="默认值" />

<script src="script/jquery-1.7.1.min.js" type="text/javascript"></script><script type="text/javascript">$(function () {$("#txtName").focus(function () {if ($(this).val() == "默认值") {$(this).val("");}}).blur(function () {if ($(this).val() == "") {$(this).val("默认值");}})});</script>

 

2.服务器控件.<asp:TextBox> 直接写在客户端上:

    <asp:TextBox ID="txtName" runat="server" Text="默认值" OnFocus="javascript:if(this.value=='默认值') {this.value=''}"OnBlur="javascript:if(this.value==''){this.value='默认值'}"></asp:TextBox>

3.服务器控件写到C#服务器端上:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Script.Serialization;namespace Web
{public partial class Default : System.Web.UI.Page{protected void Page_Load(object sender, EventArgs e){txtName.Attributes.Add("Value", "默认值");txtName.Attributes.Add("OnFocus", "if(this.value=='默认值') {this.value=''}");txtName.Attributes.Add("OnBlur", "if(this.value==''){this.value='默认值'}");}}
}

总结. 单个文本框设置默认值时