ASP.NET TextBox 當鼠標點擊后清空默認提示文字

ASP.NET TextBox 當鼠標點擊后清空默認提示文字

[ 方法一]

前台代碼：

<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>

后台代碼：

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)
    {
        //用戶輸入
        txtName.Attributes.Add("Value", "請輸入用戶名");
        txtName.Attributes.Add("OnFocus", "if(this.value=='請輸入用戶名') {this.value=''}");
        txtName.Attributes.Add("OnBlur", "if(this.value==''){this.value='請輸入用戶名'}");
        //密碼輸入
        txtPwd.Attributes.Add("Value", "請輸入密碼");
        txtPwd.Attributes.Add("OnFocus", "if(this.value=='請輸入密碼'){this.value=''}");
        txtPwd.Attributes.Add("OnBlur", "if(this.value==''){this.value='請輸入密碼'}");

        //
        if (!IsPostBack)
        {
            //內容
        }
    }
}

 

[ 方法二]

前台文本框里添加下面2個事件屬性：

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="請輸入用戶名"

OnFocus="javascript:if(this.value=='請輸入用戶名') {this.value=''}"

OnBlur="javascript:if(this.value==''){this.value='請輸入用戶名'}">

</asp:TextBox>

<asp:TextBox ID="txtPwd" runat="server" Text="請輸入密碼"

OnFocus="javascript:if(this.value=='請輸入密碼') {this.value=''}"

OnBlur="javascript:if(this.value==''){this.value='請輸入密碼'}">

</asp:TextBox>