Why does jQuery Ajax not respond when interacting with ASP.NET 4.0?

If you build websites and applications using ASP.NET 4.0 and jQuery Ajax, you may encounter some problems. One of them is that when you try to interact with ASP.NET 4.0 using jQuery Ajax, you find that it becomes unresponsive. In this article I'll go over some of the possible causes of this and provide some solutions.

1. Make sure you are using jQuery Ajax correctly

First, make sure you are using jQuery Ajax correctly. First, make sure the jQuery library is loaded on the page and is using the correct version. Then, make sure your code actually uses jQuery Ajax and has no errors.

If you are not sure how to use jQuery Ajax, you can refer to the jQuery official documentation. Also, to help you understand better, here is a simple example:

$.ajax({
  url: "your-url",
  type: "POST",
  data: "your-data",
  success: function(data) {
    // 执行成功回调的代码
  },
  error: function() {
    // 执行失败回调的代码
  }
});

2. Make sure to handle cross-domain requests correctly

If your jQuery Ajax request involves Different domain names or ports, then you may encounter cross-domain request issues. In this case, you need to make sure you handle cross-origin requests correctly.

In ASP.NET 4.0, you can use CORS (Cross-Origin Resource Sharing) to solve this problem. Here is sample code to enable CORS in ASP.NET 4.0:

protected void Application_BeginRequest(object sender, EventArgs e)
{
    HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");

    if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
    {
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods",
        "GET, POST, PUT, DELETE");
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers",
        "Content-Type, Accept");
        HttpContext.Current.Response.End();
    }
}

3. Make sure errors are handled

When a jQuery Ajax request fails, you need to make sure you correctly The error was handled. In most cases, this means handling error callbacks.

Here is a sample code that uses jQuery Ajax to handle errors:

$.ajax({
    //Ajax参数
}).done(function(data) {
    //成功回调
}).fail(function(xhr, status, error) {
    //失败回调
    console.log(xhr.responseText);
});

4. Make sure the Web.config file is configured correctly

If your ASP.NET The 4.0 application is still not responding to jQuery Ajax requests, please make sure you configure the Web.config file correctly.

The following is an example of a correct Web.config file:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.0" />
    <httpRuntime targetFramework="4.0" />
  </system.web>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true" />
    <validation validateIntegratedModeConfiguration="false" />
    <handlers>
      <add name="*.html" path="*.html" verb="*" type="System.Web.UI.PageHandlerFactory" resourceType="Unspecified" preCondition="integratedMode" />
    </handlers>
  </system.webServer>
</configuration>

Where, System.Web.Extensions should be correctly added to the Web.config file configSections in the node.

The above are some reasons and solutions that may cause jQuery Ajax to become unresponsive. If this happens to you, try these solutions to see if they resolve the issue. If the problem persists, try asking for help in the community forum.

The above is the detailed content of Why does jQuery Ajax not respond when interacting with ASP.NET 4.0?. For more information, please follow other related articles on the PHP Chinese website!