Question

如何制作一个代码，当我点击asp.net上的按钮时，会出现一个引导程序或消息框的警告消息？

protected void ButtonLogin_Click(object sender, EventArgs e)
    {
        //TextBoxEmail.Text = DateTime.Now.ToString();
        string UserName = TextBoxEmail.Text.Trim();
        string password = TextBoxPassword.Text.Trim();
        OracleConnection conn = new OracleConnection(strConnString);
        conn.Open();

        sql = "select password from userlogin where USERNAME = '" + UserName + "' and password ='" + password + "' ";
    cmd = new OracleCommand(sql, conn);


    // orada=new OracleDataAdapter(com.CommandText,conn);
    // cmd.CommandType = CommandType.Text;
    dr = cmd.ExecuteReader();
    //dr.Read();

    if (dr.HasRows)
    {
        Label1.Text = "";
        Response.Redirect("Details.aspx");
    }
    else
    {
        Label1.Text = "No data found...";
        conn.Close();
    }

   }

}

上面，在else部分：

 else
         {
             Label1.Text = "No data found...";
             conn.Close();
         }

当用户名和密码不匹配时，我想在网站上显示一个引导警报或消息框：“密码不正确”。我怎么能这样做？

Answer 1

HTML（MasterPage）：

<div class="MessagePanelDiv">
    <asp:Panel ID="Message" runat="server" Visible="False">
        <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>
        <asp:Label ID="labelMessage" runat="server" />
    </asp:Panel>
</div>

ENUM：

public enum WarningType
{
    Success,
    Info,
    Warning,
    Danger
}

代码隐藏：

/// <summary>
/// Shows a message based of type and message
/// </summary>
/// <param name="message">Message to display</param>
/// <param name="type">ENUM type of the message</param>

public void ShowMessage(string Message, WarningType type)
{
    //gets the controls from the page
    Panel PanelMessage = Master.FindControl("Message") as Panel;
    Label labelMessage = PanelMessage.FindControl("labelMessage") as Label;

    //sets the message and the type of alert, than displays the message
    labelMessage.Text = Message;
    PanelMessage.CssClass = string.Format("alert alert-{0} alert-dismissable", type.ToString().ToLower());
    PanelMessage.Attributes.Add("role", "alert");
    PanelMessage.Visible = true;
}

用法：

ShowMessage("<strong> Error! </strong> Error message to show", WarningType.Danger);

修改

CSS类：

.MessagePanelDiv { position:fixed; left: 35%; top:15%; width:35%; }

Javascript计时器自动删除警报：

$(document).ready(function () { window.setTimeout(function () { $(".alert").fadeTo(1500, 0).slideUp(500, function () { $(this).remove(); }); }, 3000); });

没有MasterPage

<div class="MessagePanelDiv"> <asp:Panel ID="Message" runat="server" CssClass="hidepanel"> <a href="#" class="close" data-dismiss="alert" aria-label="close">×</a> <asp:Label ID="labelMessage" runat="server" /> </asp:Panel> </div>

CSS：

.hidepanel { display: none; }

代码隐藏：

labelMessage.Text = "Successfully updated." Message.CssClass = String.Format("alert alert-{0} alert-dismissable", Constants.WarningType.Success.ToString().ToLower()) Message.Attributes.Add("role", "alert")

Answer 2

老问题，但对那些只想要简单解决方案的人来说。

您必须拥有一个包含ID为“main”的ContentPlaceHolder的母版页

创建此类：

  public class BootstrapPage：Page
{
    public enum WarningType
    {
        成功，
        信息，
        警告，
        危险
    }

    public void ShowNotification（字符串消息，WarningType类型）
    {
        var mainContentHolder = Master.FindControl（“main”）as ContentPlaceHolder;
        面板notificationPanel = new Panel（）;
        {
            LiteralControl closeButton = new LiteralControl（）;
            closeButton.Text =“＆times; ”;

            标签notificationMessage = new Label（）{Text = message};

            notificationPanel.Controls.Add（closeButton）;
            notificationPanel.Controls.Add（notificationMessage）;
        }
        notificationPanel.CssClass = string.Format（“alert alert- {0} alert-dismissable”，type.ToString（）。ToLower（））;
        notificationPanel.Attributes.Add（“role”，“alert”）;

        mainContentHolder.Controls.AddAt（0，notificationPanel）;
    }
}



然后从BootstrapPage而不是System.Web.UI.Page中创建WebForm inheirt 

在需要时调用它：

  ShowNotification（“错误：你不能这样做！”，WarningType.Error）;

Answer 3

为此你需要引用bootstrap链接和jquery

<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
    <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>

接下来将此添加到Aspx页面的主题部分：

 <style type="text/css">
        .messagealert {
            width: 100%;
            position: fixed;
             top:0px;
            z-index: 100000;
            padding: 0;
            font-size: 15px;
        }
    </style>
    <script type="text/javascript">
        function ShowMessage(message, messagetype) {
            var cssclass;
            switch (messagetype) {
                case 'Success':
                    cssclass = 'alert-success'
                    break;
                case 'Error':
                    cssclass = 'alert-danger'
                    break;
                case 'Warning':
                    cssclass = 'alert-warning'
                    break;
                default:
                    cssclass = 'alert-info'
            }
            $('#<%=ButtonLogin.ClientID %>').append('<div id="alert_div" style="margin: 0 0.5%; -webkit-box-shadow: 3px 4px 6px #999;" class="alert fade in ' + cssclass + '"><a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a><strong>' + messagetype + '!</strong> <span>' + message + '</span></div>');
        }
    </script>

在Cs代码中

  protected void ShowMessage(string Message, MessageType type)
    {
        ScriptManager.RegisterStartupScript(this, this.GetType(), System.Guid.NewGuid().ToString(), "ShowMessage('" + Message + "','" + type + "');", true);
    }

现在在其他部件调用错误功能中，您也可以通过更改消息类型来使用此功能

ShowMessage("Aww, password is wrong", MessageType.Error);

asp.net上按钮事件中的Bootstrap警报

3 个答案: