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    <p>The mechanize page is not suggesting that you can emulate JavaScript in Python. It is saying that you can change a hidden field in a form, thus tricking the web server that a human<sup><a href="http://groups.google.com/group/nzpug/browse_thread/thread/a10538fb635d5786" rel="nofollow">1</a></sup> has selected the field. You still need to analyse the target yourself. </p> <p>There will be no Python-based solution to this problem, unless you wish to create a JavaScript interpreter in Python.</p> <p><a href="http://groups.google.com/group/nzpug/browse_thread/thread/a10538fb635d5786" rel="nofollow">My thoughts</a> on this problem have led me to three possible solutions:</p> <ol> <li>create an <a href="https://developer.mozilla.org/en/XULRunner" rel="nofollow">XULRunner</a> application</li> <li>browser automation</li> <li>attempt to interpret the client-side code</li> </ol> <p>Of those three, I've only really seen discussion of 2. I've seen something close to 1 in a commercial scraping application, where you basically create scripts by browsing on sites and selecting things on the pages that you would like the script to extract in the future.</p> <p>1 could possibly made to work with a Python script by accepting a serialisation (JSON ?) of <a href="http://www.wsgi.org/wsgi/What_is_WSGI" rel="nofollow">wsgi</a> Request objects, getting the app to fetch the URL, then sending the processed page as a wsgi Response object. You could possibly wrap some middleware around urllib2 to achieve this. Overkill probably, but kind of fun to think about.</p> <p>2 is usually achieved via <a href="http://seleniumhq.org/projects/remote-control/" rel="nofollow">Selenium RC</a> (Remote Control), a testing-centric tool. It provides a few methods like <code>getHtmlSource</code> but most people that I've heard using it get don't like its API.</p> <p>3 I have no idea about. <a href="http://nodejs.org/" rel="nofollow">node.js</a> is very hot right now, but I haven't touched it. I've never been able to build <a href="http://www.mozilla.org/js/spidermonkey/" rel="nofollow">spidermonkey</a> on my Ubuntu machine, so I haven't touched that either. My hunch is that in order to do this, you would provide the HTML source and your details to a JS interpreter, that would need to fake being your User-Agent etc in case the JavaScript wanted to reconnect with the server.</p> <p><sup><a href="http://groups.google.com/group/nzpug/browse_thread/thread/a10538fb635d5786" rel="nofollow">1</a></sup> well, more technically, a JavaScript compliant User-Agent, which is almost always a web browser used by a human</p>
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    1. COThanks, for a great explanation of why I can't do it :-) Actually at least now I have a better understanding of the problem. Thanks again.
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    2. COThis seems like a solution. http://code.google.com/p/spynner/
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    3. COSweet! Nice find, thanks!
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