JavaScript:Alert.Show(消息)来自ASP.NET代码隐藏

Question

我正在阅读这个JavaScript:Alert.Show(消息)来自ASP.NET代码隐藏

我正在努力实现同样的目标.所以我创建了一个这样的静态类:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Web;
using System.Text;
using System.Web.UI;

namespace Registration.DataAccess
{
    public static class Repository
    {
        /// <summary> 
        /// Shows a client-side JavaScript alert in the browser. 
        /// </summary> 
        /// <param name="message">The message to appear in the alert.</param> 
        public static void Show(string message) 
            { 
               // Cleans the message to allow single quotation marks 
               string cleanMessage = message.Replace("'", "\'"); 
               string script = "<script type="text/javascript">alert('" + cleanMessage + "');</script>"; 

               // Gets the executing web page 
               Page page = HttpContext.Current.CurrentHandler as Page; 

               // Checks if the handler is a Page and that the script isn't allready on the Page 
               if (page != null && !page.ClientScript.IsClientScriptBlockRegistered("alert")) 
               { 
                 page.ClientScript.RegisterClientScriptBlock(typeof(Alert), "alert", script); 
               } 
            } 
    }
}

在这一行:

string script = "<script type="text/javascript">alert('" + cleanMessage + "');</script>"; 

它向我显示错误:; 预期

还有

page.ClientScript.RegisterClientScriptBlock(typeof(Alert), "alert", script); 

错误:找不到类型或命名空间名称"警报"(您是否缺少using指令或程序集引用？)

我在这做错了什么？

Answer 1

这是一个简单的方法:

Response.Write("<script>alert('Hello');</script>");

Answer 2

string script = string.Format("alert('{0}');", cleanMessage);
if (page != null && !page.ClientScript.IsClientScriptBlockRegistered("alert")) 
{
    page.ClientScript.RegisterClientScriptBlock(page.GetType(), "alert", script, true /* addScriptTags */);
}

Answer 3

此消息直接显示警报消息

ScriptManager.RegisterStartupScript(this,GetType(),"showalert","alert('Only alert Message');",true);

此消息显示来自JavaScript函数的警报消息

ScriptManager.RegisterStartupScript(this, GetType(), "displayalertmessage", "Showalert();", true);

这两种方法可以在后面的c#代码中显示警报消息

Answer 4

如果您在页面上使用ScriptManager,那么您也可以尝试使用它:

System.Web.UI.ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "AlertBox", "alert('Your Message');", true);

Answer 5

试试这个方法:

public static void Show(string message) 
{                
    string cleanMessage = message.Replace("'", "\'");                               
    Page page = HttpContext.Current.CurrentHandler as Page; 
    string script = string.Format("alert('{0}');", cleanMessage);
    if (page != null && !page.ClientScript.IsClientScriptBlockRegistered("alert")) 
    {
        page.ClientScript.RegisterClientScriptBlock(page.GetType(), "alert", script, true /* addScriptTags */);
    } 
} 

在Vb.Net

Public Sub Show(message As String)
    Dim cleanMessage As String = message.Replace("'", "\'")
    Dim page As Page = HttpContext.Current.CurrentHandler
    Dim script As String = String.Format("alert('{0}');", cleanMessage)
    If (page IsNot Nothing And Not page.ClientScript.IsClientScriptBlockRegistered("alert")) Then
        page.ClientScript.RegisterClientScriptBlock(page.GetType(), "alert", script, True) ' /* addScriptTags */
    End If
End Sub