C＃中的Javascript警报不起作用
[英]Javascript alert in C# not working
问题描述
I have few textboxes to view and also update records. 
我只有几个文本框可以查看和更新记录。 Here is my code to check for any duplicate record before save or update & alert the user if there is any. 这是我的代码，用于在保存或更新之前检查是否有重复记录，并在有任何记录时提醒用户。 The javascript alert is popping up for 'Update' but not for 'Save'. javascript警报针对“更新”弹出，而不针对“保存”弹出。 The debugger even reads the line in the else block. 调试器甚至读取else块中的行。 Where am I going wrong? 我要去哪里错了？
protected void Save_Click(object sender, EventArgs e)
{
int returnId;
returnId = chkDuplicates(value,1);//function to check for any duplicate value
if(returnId==0)
//save the record
else
ScriptManager.RegisterStartupScript(this,typeof(Page), "MsgSave",
"alert('value exists');", true);
}
protected void Update_Click(object sender, EventArgs e)
{
int returnId;
returnId = chkDuplicates(value,2);//function to check for any duplicate value
if(returnId==0)
//update the record
else
ScriptManager.RegisterStartupScript(this,typeof(Page), "MsgUpdate",
"alert('value exists');", true);
}
8 个解决方案
解决方案1
1 2013-09-21 08:57:05
Please try this, It may helps 请尝试这个，可能会有所帮助
ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(),
"Msg", "alert('value exists');", true);
解决方案2
1 2013-09-21 09:01:37
Have you made sure that the function chkDuplicates actually returns a non zero value for the Save_Click use case? 您是否确定chkDuplicates函数实际上为Save_Click用例返回了一个非零值？
Any ways this is not the appropriate way to implement such use cases. 任何方式都不是实现此类用例的适当方式。 The best way would be to create these methods as Webmethods and call them via ajax calls on button click events using javascript. 最好的方法是将这些方法创建为Web方法，并使用javascript通过按钮单击事件上的ajax调用来调用它们。 Throw a custom exception in case the duplicate exists. 如果重复项存在，则抛出一个自定义异常。 This will result in the faliure callback on your ajax call. 这将导致ajax调用发生故障回调。 On this call back show watever alert you need to show. 在此回叫显示水警报中，您需要显示。
This is how you do it elegantly and not register scripts in server side code. 这是您优雅地执行操作的方法，并且不会在服务器端代码中注册脚本。 This will also save your application from post backs and unnecessary page reloads. 这还将使您的应用程序免于回发和不必要的页面重新加载。
解决方案3
1 2013-09-21 09:07:10
In both of your Startup Scripts, your Key is 在两个启动脚本中，您的密钥是
"Msg"
and If you look for the definition of 'string key' parameter in RegisterStartupScript Method, it says ' A Unique Identifier for the Script Block '. 如果您在RegisterStartupScript方法中查找“字符串键”参数的定义，则会显示“ 脚本块的唯一标识符 ”。 So it must be Unique from other Keys in the specific Page. 因此它必须与特定页面中的其他键唯一。
解决方案4
0 2013-09-21 08:47:49
On the button, add an onClientClick to call the JavaScript. 在按钮上，添加onClientClick来调用JavaScript。 If it then passes you're, server side code will be called. 如果它通过了您，服务器端代码将被调用。
解决方案5
0 2013-09-21 08:51:37
显示javascript警报弹出窗口的另一种方法可能是这样
Response.Write("<script>alert(\"Your text here\");</script>");
解决方案6
0 2013-09-21 08:55:42
try this...it workd for me.... 试试这个...对我有用....
ClientScript.RegisterStartupScript(typeof(Page), "alertMessage",
"<script type='text/javascript'>alert('value exist');window.location.replace('yourpage.aspx');</script>");
解决方案7
0 2013-09-21 09:20:09
Here we are showing alert message directly 在这里，我们直接显示警报消息
ScriptManager.RegisterStartupScript(this,GetType(),"showalert","alert('Only alert Message');",true);
Here we are showing alert message from javascript 在这里，我们显示了来自javascript的警报消息
ScriptManager.RegisterStartupScript(this, GetType(), "displayalertmessage", "Showalert();", true);
These are the two-ways to display alert messages in c# 这是在C＃中显示警报消息的两种方式
解决方案8
0 2013-09-24 12:31:10
Please make sure you are not using Save button under any Update Panel . 请确保您没有使用任何“ 更新面板”下的“保存”按钮。 this problem occurs when you do asynchronous postback. 当您执行异步回发时，会发生此问题。 I tested your code in new web page and it is working fine. 我在新的网页中测试了您的代码，它工作正常。
Code at aspx page ASPX页面上的代码
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Save" runat="server" Text="Save" onclick="Save_Click1" />
<asp:Button ID="Update" runat="server" Text="Update" onclick="Update_Click1" /></div>
</form>
</body>
</html>
Code at Code-Behind file 代码隐藏文件中的代码
protected void Save_Click1(object sender, EventArgs e)
{
int returnId;
returnId = 1;
if (returnId == 0)
{ }
else
ScriptManager.RegisterStartupScript(this, typeof(Page), "MsgSave",
"alert('save value exists');", true);
}
protected void Update_Click1(object sender, EventArgs e)
{
int returnId;
returnId = 2;
if (returnId == 0)
{ }
else
ScriptManager.RegisterStartupScript(this, typeof(Page), "MsgUpdate",
"alert('update value exists');", true);
}
May be this will help you. 可能会对您有帮助。
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