如何检测jQuery $ .get失败? [英] How to detect jQuery $.get failure?

问题描述

我是jQuery初学者.我正在尝试使用$ .get()编写一个非常简单的代码.官方文档说:

I'm a jQuery beginner. I'm trying to code a very simple using $.get(). The official documentation says:

如果使用jQuery.get()的请求返回错误代码，则除非脚本也调用了全局.ajaxError()方法，否则该请求将以静默方式失败.

If a request with jQuery.get() returns an error code, it will fail silently unless the script has also called the global .ajaxError() method or.

从jQuery 1.5开始，jqXHR对象的.error()方法jQuery.get()返回的结果也可用于错误处理.

As of jQuery 1.5, the .error() method of the jqXHR object returned by jQuery.get() is also available for error handling.

因此，如果一切顺利，将调用成功的回调函数.但是，如果请求失败，我想获取HTTP代码:404、502等，并为用户制定有意义的错误消息.

So, if all goes well, my callback function for success will be called. However, if the request fails, I would like to get the HTTP code :404, 502, etc and formulate a meaningful error message for the user.

但是，由于这是一个异步调用，所以我可以想象我可能有几个出色的人..ajaxError()如何知道它对应于哪个请求?也许最好使用jQuery.get()返回的jqXHR对象的.error()方法?

However, since this is an asynchronous call I can imagine that I might have several outstanding. How would .ajaxError() know which request it corresponds to? Maybe it would be better to use the .error() method of the jqXHR object returned by jQuery.get()?

我正在寻找一个非常简单的代码示例.也许成功例程调用Alert(找到页面")，而失败例程检查404，并执行Alert(找不到页面").

I am seeking an extremely simple code example. Perhaps the success routine calls Alert("Page found") and the failure routine checks for 404 and does an Alert("Page not found").

以下页面非常有帮助: http://api.jquery.com/jQuery.get/

The following page is extremely helpful: http://api.jquery.com/jQuery.get/

推荐答案

很正确，您可以使用jQuery 1.5的新jqXHR将错误处理程序分配给 $.get()请求.这是您可以做到的方式:

You're right that you can use jQuery 1.5's new jqXHR to assign error handlers to $.get() requests. This is how you can do it:

var request = $.get('/path/to/resource.ext');

request.success(function(result) {
  console.log(result);
});

request.error(function(jqXHR, textStatus, errorThrown) {
  if (textStatus == 'timeout')
    console.log('The server is not responding');

  if (textStatus == 'error')
    console.log(errorThrown);

  // Etc
});

您还可以将处理程序直接链接到调用上:

You can also chain handlers directly onto the call:

$.get('/path/to/resource.ext')
     .success(function(result) { })
     .error(function(jqXHR, textStatus, errorThrown) { });

我更希望前者使代码不那么混乱，但是两者是等效的.

I prefer the former to keep the code less tangled, but both are equivalent.

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