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copied!<p>It's probably not a Sinatra / Jquery interaction problem, instead, it's an Ajax "cross domain security" problem.</p> <p>Your original problem could be due to the fact that you've got your form and your server hosted on different domains. XMLHTTPRequests such as <code>.get</code>, <code>.post</code>, <code>.ajaxForm</code> and <code>.ajaxSubmit</code>, will fail if they are on different domains. Check your logs on the app that receives the post, and you might see something like <code>"OPTIONS behavior_count" 404</code> in the log file. Basically, it will work when you hit the app directly, but when you try to use AJax to do it, and that Ajax is accessing it from a different domain, i.e., the "action" option on the form has <code>"http://some.differentdomain.com/behavior_count"</code> in it.</p> <p>That would explain why your simple example works, because the form and the post are happening on the same application / same domain.</p> <p>I had the same problem for five hours just now; I wanted to use a generic "comments" application and have other applications be able to post to the one central application, on a different domain. It won't work. But then I made the two applications into one, and everything was fine. Alternately, you can try to use JSONP to make it work and still keep the two applications separate. </p> <p>I read "<a href="https://stackoverflow.com/questions/1099787/jquery-ajax-post-sending-options-as-request-method-in-firefox">jQuery $.ajax(), $.post sending “OPTIONS” as REQUEST_METHOD in Firefox</a>", which helped. </p>

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