为什么JQuery的AJAX调用不工作？ [英] Why JQuery AJAX call is not working?

问题描述

以下是我的JQuery AJAX方法：

The following is my JQuery AJAX method:

function meFun() {
    alert('enter');

    $.ajax({
        type: "POST",
        url: "About.aspx/GetRes",
        data: "{}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (msg) {
            // Do something interesting here.
            alert(msg);
        }
    });
    alert('end');

}

以下是我的按钮code：

The following is my button code:

<input type="button" onclick="meFun();" value="Click me" id="btn" />

Folling是我在About.aspx功能

Folling is my function in About.aspx

Public Function GetRes() As Boolean
    Return True
End Function

的 meFun（）方法调用成功，但不叫 GetRes（）和AJAX调用不返回任何响应。

The meFun() method is called successfully but doesn't call the GetRes() and the AJAX call doesn't return any response.

任何想法，为什么？另外，请提出来调试这些类型的问题，AJAX的一个很好的方式。

Any idea why? Also, please suggest a good way to debug these sorts of AJAX problems.

推荐答案

首先，确保你有你的服务器端GetRes功能WebMethod属性（这是在C＃中，我不知道你是怎么做的，在VB）并GetRes静态的（或者任何在VB中相当于是）。

First, make sure you have the WebMethod attribute on your server side GetRes function (this is in C#, I don't know how you do that in VB) and make GetRes static (or whatever the equivalent in VB is).

[WebMethod]
public static bool GetRes()
{
  return true;
}

然后，添加错误处理您的jQuery AJAX 电话：

Then, add the error handlers to your jQuery ajax call:

$.ajax({
        type: "POST",
        url: "About.aspx/GetRes",
        data: "{}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (msg) {
            // Do something interesting here.
            alert(msg);
        },
        error: function (data) {
        }
    });
    alert('end');

编辑：调试，设置错误处理程序设置断点，检查数据参数。所有的浏览器（好吧，我可以保证IE，火狐（使用Firebug）和Chrome）具有良好的脚本调试。如果发生错误，将有数据属性，其中逃避我此刻的名称，详细解释了该错误。

to debug, set a breakpoint in the error handler and inspect the data parameter. All browsers (well, I can vouch for IE, Firefox (with Firebug) and Chrome) have good script debuggers. If an error occurs, there will be a property in data, the name of which eludes me at the moment, that explains the error in detail.

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