jQuery ajax (jsonp) 忽略超时并且不触发错误事件 [英] jQuery ajax (jsonp) ignores a timeout and doesn't fire the error event

问题描述

为了添加一些基本的错误处理，我想重写一段代码，使用 jQuery 的 $.getJSON 从 Flickr 中提取一些照片.这样做的原因是 $.getJSON 不提供错误处理或超时工作.

To add some basic error handling, I wanted to rewrite a piece of code that used jQuery's $.getJSON to pull in some photo's from Flickr. The reason for doing this is that $.getJSON doesn't provide error handling or work with timeouts.

由于 $.getJSON 只是 $.ajax 的一个包装器，我决定重写它并惊喜地发现，它完美无缺.

Since $.getJSON is just a wrapper around $.ajax I decided to rewrite the thing and surprise surprise, it works flawlessly.

不过现在好戏开始了.当我故意导致 404(通过更改 URL)或导致网络超时(通过未连接到互联网)时，错误事件根本不会触发.我不知道我做错了什么.非常感谢帮助.

Now the fun starts though. When I deliberately cause a 404 (by changing the URL) or cause the network to timeout (by not being hooked up to the interwebs), the error event doesn't fire, at all. I'm at a loss as to what I'm doing wrong. Help is much appreciated.

代码如下:

$(document).ready(function(){

    // var jsonFeed = "http://api.flickr.com/services/feeds/photos_public.gne"; // correct URL
    var jsonFeed = "http://api.flickr.com/services/feeds/photos_public.gne_______"; // this should throw a 404

    $.ajax({
        url: jsonFeed,
        data: { "lang" : "en-us",
                "format" : "json",
                "tags" : "sunset"
        },
        dataType: "jsonp",
        jsonp: "jsoncallback",
        timeout: 5000,
        success: function(data, status){
            $.each(data.items, function(i,item){
                $("<img>").attr("src", (item.media.m).replace("_m.","_s."))
                          .attr("alt", item.title)
                          .appendTo("ul#flickr")
                          .wrap("<li><a href="" + item.link + ""></a></li>");
                if (i == 9) return false;
            });
        },
        error: function(XHR, textStatus, errorThrown){
            alert("ERREUR: " + textStatus);
            alert("ERREUR: " + errorThrown);
        }
    });

});

我想补充一点，这个问题是在 jQuery 1.4.2 版本时被问到的

I'd like to add that this question was asked when jQuery was at version 1.4.2

推荐答案

jQuery 1.5 及更高版本对 JSONP 请求的错误处理有更好的支持.但是，您需要使用 $.ajax 方法而不是 $.getJSON.对我来说，这有效:

jQuery 1.5 and higher have better support for error handling with JSONP requests. However, you need to use the $.ajax method instead of $.getJSON. For me, this works:

var req = $.ajax({
    url : url,
    dataType : "jsonp",
    timeout : 10000
});

req.success(function() {
    console.log('Yes! Success!');
});

req.error(function() {
    console.log('Oh noes!');
});

超时似乎可以解决问题并在 10 秒后没有成功请求时调用错误处理程序.

The timeout seems to do the trick and call the error handler, when there is no successful request after 10 seconds.

我做了一点博客文章 关于这个主题.

I did a little blogpost on this subject as well.

这篇关于jQuery ajax (jsonp) 忽略超时并且不触发错误事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！