究竟是什么触发了jQuery ajax成功? [英] What exactly triggers jQuery ajax success?
问题描述
我正在Perl Web框架中构建一些Ajax.Dancer我不确定它是否以正确的http头作为响应，因为我无法从看似成功的请求中触发jQuery的ajax成功处理程序.使用下面的ajax代码段，我在浏览器控制台中获得以下输出.完整的回调被成功调用，并给出看起来像成功的输出. Status:200 StatusText:"OK"但是，成功处理程序永远不会被调用.
I am building some ajax in a Perl web framework Dancer I am not sure it is responding with proper http headers as I cannot trigger jQuery's ajax success handlers from what appear to be otherwise successful requests. Using the ajax snippet below I get the following output in a browser console. The complete callback gets called successfully and gives what looks like successful output. Status:200 StatusText:"OK" However the success handlers never get called.
$.ajax({type: "GET", url: "/learn/faq",
success: function(data){console.log('omg got it');},
complete: function(data){console.log("complete", data);}
}).success(function(data){console.log('defered');});
Object
XHR finished loading: "https://www.localhost:4443/learn/faq". assets-d36e1bb9fd59ba3dbd0f8a0cbb37ed8e.js:1
complete
Object {readyState: 4, responseText: "↵↵<!DOCTYPE html>↵<html xmlns="http://www.w3.org/1…ead/conversion.js"></script>↵↵↵↵</body>↵</html>↵↵", status: 200, statusText: "OK"
我应该看到omg got it和defered消息，但是没有.从这个角度来看，我觉得jQuery成功处理程序的意义不仅仅在于状态，而且Dancer http实现无法正确响应.
I should be seeing the omg got it and defered messages but am not. Looking at this I feel there is more to the jQuery success handler than the status and Dancer http implementation is not responding correctly.
此后，我还向代码段添加了error处理程序，并且错误处理程序被看似成功的请求触发.
Further more I have since added an error handler to the snippet and the error handler is getting triggered with what looks like a successful request.
$.ajax({type: "GET", url: "/learn/faq",
success: function(data){console.log('omg got it');},
complete: function(data){console.log("complete", data);},
error: function(data){console.log("error!", data);}
}).success(function(data){console.log('defered');});
Object
XHR finished loading: "https://www.localhost:4443/learn/faq". assets-8cd028b93e0db9dd9455125dc98d5ae1.js:1
error!
Object {readyState: 4, responseText: "↵↵↵↵↵↵↵↵↵↵↵↵↵↵↵↵<!DOCTYPE html>↵<html xmlns="http:…></script>↵↵↵↵</body>↵</html>↵↵↵↵</body>↵</html>↵", status: 200, statusText: "OK"}
complete
Object {readyState: 4, responseText: "↵↵↵↵↵↵↵↵↵↵↵↵↵↵↵↵<!DOCTYPE html>↵<html xmlns="http:…></script>↵↵↵↵</body>↵</html>↵↵↵↵</body>↵</html>↵", status: 200, statusText: "OK"}
这是jQuery getAllResponseHeaders()
complete Date: Tue, 01 Jan 2013 22:43:52 GMT
Content-Encoding: gzip
X-Powered-By: Perl Dancer 1.3095.1
Transfer-Encoding: chunked
Connection: keep-alive
Server: nginx/1.2.4
Strict-Transport-Security: max-age=2592000
Content-Type: text/xml; charset=utf-8
推荐答案
如果
The success handler will be triggered if
- 响应的HTTP状态代码为
200(您确实如此) - jQuery能够根据响应中的
Content-Type标头(或dataType选项(如果提供)覆盖了Content-Type标头)反序列化响应.
- The response has HTTP status code
200(yours does) - jQuery is able to deserialize the response according to the
Content-Typeheader in the response (or thedataTypeoption, if you provide it, which overrides theContent-Typeheader)
例如，如果您的响应的Content-Type标头为application/json或application/xml，则您引用的响应将不会触发success处理程序，因为它无法成功反序列化为JSON或XML.
So for instance, if your response had a Content-Type header of application/json or application/xml, the response you've quoted won't trigger the success handler because it cannot be successfully deserialized as either JSON or XML.
您最新的编辑内容(截至撰写本文时)揭示了问题所在:
Your latest edit (as of this writing) reveals the problem:
这是jQuery getAllResponseHeaders()的响应标头
Here are the response headers from jQuery getAllResponseHeaders()
...
Content-Type: text/xml; charset=utf-8
我怀疑您的回复不是有效的XML，因此jQuery无法将其反序列化为XML，因此失败了.
I suspect your response isn't valid XML, so jQuery can't deserialize it as XML, so it's failing.
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