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Asked: 2026-05-20T02:02:07+00:00

I am using Sinatra to host a simple service. This is my entire application:

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I am using Sinatra to host a simple service. This is my entire application:

require 'sinatra'

get '/hello' do
  'Hello world!'
end

I then have a single html file in my ./public directory that tries a GET request on my service:

<html>
<head>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function() {
            $("a").click(function(event) {
                $.get("/hello", function() { alert("first success"); })
                        .success(function() { alert("second success"); })
                        .error(function(jqXHR) { alert("error: " + jqXHR); });
            })
        });
    </script>
</head>
<body>
<a href="">Link</a>
</body>
</html>

When I click the link on my HTML page, I see the following in my server log:

0:0:0:0:0:0:0:1%0 – – [16/Feb/2011 10:37:42] “GET /hello HTTP/1.1” 200 12 0.0030
localhost – – [16/Feb/2011:10:37:42 CST] “GET /hello HTTP/1.1” 200 12
Referer -> /hello

Which seems good, but no matter how I try to tweak things I can only get the error callback to be invoked – never the success.

I have two questions:
1) What am I doing wrong?
2) How should I go about debugging problems like this? The object passed to the error callback is just an Object, and I have no way of getting info about the error.

Thanks!

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1 Answer

  1. Editorial Team

    During my testing I was having problems with the click code for the link not having a return false;, so the page would keep reloading. With Firebug, I got the error uncaught exception: [Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIXMLHttpRequest.getAllResponseHeaders]" nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)" location: "JS frame :: http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js :: anonymous :: line 16" data: no].

    When I changed the link from <a href="">Link</a> to <a>Link</a>, the code worked (I got both first and second success messages). Also, If I left the link as-is and added return false; to the end of the $("a").click code, the code also worked.

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