ASP.NET TextBox 当鼠标点击后清空默认提示文字

[ 方法一]

前台代码：

<div>

    <asp:TextBox ID="txtName" runat="server"></asp:TextBox>

    <asp:TextBox ID="txtPwd" runat="server"></asp:TextBox>

    <asp:Button ID="btnLongin" runat="server" Text="提交" />

</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)

    {

        //用户输入

        txtName.Attributes.Add("Value", "请输入用户名");

        txtName.Attributes.Add("OnFocus", "if(this.value=='请输入用户名') {this.value=''}");

        txtName.Attributes.Add("OnBlur", "if(this.value==''){this.value='请输入用户名'}");

        //密码输入

        txtPwd.Attributes.Add("Value", "请输入密码");

        txtPwd.Attributes.Add("OnFocus", "if(this.value=='请输入密码'){this.value=''}");

        txtPwd.Attributes.Add("OnBlur", "if(this.value==''){this.value='请输入密码'}");

        //

        if (!IsPostBack)

        {

            //内容

        }

    }

}

 

[ 方法二]

前台文本框里添加下面2个事件属性：

OnFocus="javascript:if(this.value=='提示文字') {this.value=''}"

OnBlur="javascript:if(this.value=='') {this.value='提示文字'}"

-----------------------------------例-----------------------------------------

<asp:TextBox ID="txtName" runat="server" Text="请输入用户名"

OnFocus="javascript:if(this.value=='请输入用户名') {this.value=''}"

OnBlur="javascript:if(this.value==''){this.value='请输入用户名'}">

</asp:TextBox>

<asp:TextBox ID="txtPwd" runat="server" Text="请输入密码"

OnFocus="javascript:if(this.value=='请输入密码') {this.value=''}"

OnBlur="javascript:if(this.value==''){this.value='请输入密码'}">

</asp:TextBox>