如何在中添加参数 [英] How to add an argument in the

问题描述

参考 http：/ /www.aspsnippets.com/Articles/Server-Side-Code-Behind-Yes-No-Confirmation-Message-Box-in-ASPNet.aspx [ ^ ]，我修改了代码并在JS函数中添加一个参数，以便从确认对话框中捕获是或否值。相关代码如下所示：

Referring to http://www.aspsnippets.com/Articles/Server-Side-Code-Behind-Yes-No-Confirmation-Message-Box-in-ASPNet.aspx[^], I revised the code and added an argument in the JS function in order to catch the "Yes" or "No" value from the Confirmation dialog. The related code are shown below:

// Code-behind
protected void Button1_Click(object sender, EventArgs e)  {
    int d = 10;
    string confirmValue = Request.Form["confirm_value('" + d + "'"];   
    if (confirmValue == "Yes")  {
        this.Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('You clicked YES!')", true);
    } else {
    this.Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('You clicked NO!')", true);
}

// JavaScript
function Confirm(days) {
    var confirm_value = document.createElement("INPUT");
    confirm_value.type = "hidden";
    confirm_value.name = "Your Password is to be expired in " + days + " days.  Do you want to reset your Password?"";
    if (confirm("Do you want to save data?")) {
        confirm_value.value = "Yes";
    } else {
        confirm_value.value = "No";
    }
    document.forms[0].appendChild(confirm_value);
}

// HTML
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button"  OnClientClick = "Confirm(d)" />

但是，我得到了Microsoft JScript运行时错误：'d'未定义。怎么调试呢？非常感谢。

However, I got Microsoft JScript runtime error: 'd' is undefined. How can this be debugged? Thanks a lot.

推荐答案

当点击Button1时，你告诉浏览器调用一个名为Confirm的函数，你告诉它传递变量d。但你永远不会定义d是什么。



有几件事：



1.不要使用C＃来创建JavaScript。只需将您的JavaScript写入JS文件并将其包含在您的页面中即可。它使事情更容易处理。

2.不要将函数命名为内置函数。小写确认是一个内置的JS函数，并且会混淆其他需要稍后维护代码的开发人员。

3.你的Button1基本上有2个事件。 1将在JavaScript中首先触发，然后在C＃中随后触发另一个。同样，不要为此目的使用C＃。只需在JavaScript中执行即可。 C＃应该用于您需要在服务器上执行的操作，例如访问数据库，发送电子邮件等。

When Button1 is clicked you told the browser to call a function named Confirm and you are telling it to pass the variable d. But you never define what d is.

A couple of things:

1. Don't use C# to create JavaScript. Just write your JavaScript in a JS file and include it in your page. It keeps things much easier to deal with.
2. Don't name a function the same as a built-in function. Lowercase confirm is a built-in JS function and will confuse other developers who have to later maintain your code.
3. You basically have 2 events on your Button1. 1 that will fire first in JavaScript and then another that will happen afterwards in C#. Again, don't use C# for this purpose. Just do it in JavaScript. C# should be used for things you need to do on the server, such as access a database, send email, etc.

// Code-behind
protected void Button1_Click(object sender, EventArgs e)  {
    int d = 10;
    // **** Changed Request.Form code ****
    string confirmValue = Request.Form["confirm_value"];
    if (confirmValue == "Yes")  {
        this.Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('You clicked YES!')", true);
    } else {
    this.Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('You clicked NO!')", true);
}

// JavaScript
function Confirm(days) {
    var confirm_value = document.createElement("INPUT");
    confirm_value.type = "hidden";
    // **** Changed name ****
    confirm_value.name = "confirm_value";
    if (confirm("Do you want to save data?")) {
        confirm_value.value = "Yes";
    } else {
        confirm_value.value = "No";
    }
    document.forms[0].appendChild(confirm_value);
}

// HTML
<!-- **** Hard coded param **** -->
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button"  OnClientClick = "Confirm(10)" />

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