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
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