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POPython/CGI/Ajax: cgi.FieldStorage does not receive arguments
 

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    <p>I am trying to get a Python, cgi module, ajax/javascript combination to work. Due to the nature of my server access (essentially rented webspace), I cannot install things like django or any other webframework. I am stuck with cgi for now. I am able to call the python file to simply print out something, but once it comes to passing an argument to the python file the cgi.FieldStorage() does not receive any input. When I add a print statement for the FieldStorage, the output is as follows:</p> <pre><code>FieldStorage(None, None, []) </code></pre> <p>You can find all the necessary code below. Essentially, all I am trying to do (for testing purposes) is to get a string from a text input, add a "1" to the end of it and return it.</p> <p>Interestingly, when I use a simple php file that does the exact same thing and use it in the otherwise exact same script, the script works without any issues. Here's a typical php script that I tried:</p> <pre><code>&lt;?php $user = urldecode(implode(file('php://input'))); $adj_user = $user . "1"; echo $adj_user; ?&gt; </code></pre> <p>(Please note that I want to use python, because I am far more comfortable with it and I dislike php quite a bit.)</p> <p>I have the feeling that I am just a little bit dense and it is something very simple. Any help in finding what I am doing wrong is very appreciated. Thanks a lot in advance!</p> <p>P.S. I have scoured stackoverflow and the web quite some time before I posted on here. There are many related topics, but nothing quite as (seemingly) simple as what I am asking. If there is an answered duplicate to this question then I apologise and would be grateful for a link. Thanks again.</p> <p>The traceback is:</p> <pre><code>Traceback (most recent call last): File "/home/www/xxxxx/html/cgi-bin/hello.py", line 14, in &amp;lt;module&amp;gt; adj_user = form['user'] + "1" File "/usr/lib/python2.5/cgi.py", line 567, in __getitem__ raise KeyError, key KeyError: 'user' </code></pre> <p>Here is the "index.html"</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;Report&lt;/title&gt; &lt;script type='text/javascript' src='test.js'&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form method="post" action=""&gt; &lt;p&gt;Please enter your name here: &lt;input type="text" name="user"&gt; &lt;input type="submit" name="submit" value="Submit" onClick="return hello(this.form.user.value);"&gt; &lt;/p&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>This is the "test.js" file:</p> <pre><code>function hello(user) { // Mozilla version if (window.XMLHttpRequest) { xhr = new XMLHttpRequest(); } // IE version else if (window.ActiveXObject) { xhr = new ActiveXObject("Microsoft.XMLHTTP"); } //user=encodeURIComponent(user); xhr.open("POST", "../cgi-bin/hello.py"); xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded; charset=UTF-8'); xhr.send(user); xhr.onreadystatechange=function() { if (xhr.readyState===4) { adj_user = xhr.responseText; alert ("Hello " + adj_user); } } return false; } </code></pre> <p>and lastly "hello.py" in my server's cgi-bin</p> <pre><code>#!/usr/bin/env python # -*- coding: UTF-8 -*- import cgi form = cgi.FieldStorage() # enable debugging import cgitb cgitb.enable() print "Content-Type: text/html;charset=utf-8" print adj_user = form['user'] + "1" print adj_user </code></pre> <hr> <p><em>EDIT</em></p> <p>I made some progress, but it still isn't what I am hoping for. I changed the following block as follows:</p> <pre><code> xhr.open("GET", "../cgi-bin/hello.py?user=" + user, true); xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded; charset=UTF-8'); xhr.send(); </code></pre> <p>Please note the change from POST to GET and the suffix ' "?user=" + user ', as well as the removal of the 'user' argument in the send() method.</p> <p>Now this does, what I want, but it just shouldn't "be" that way. There must be a way to get this to work the classical way...</p> <p>As usual, any attempt or suggestion is welcome. I really don't know what else to try. Thanks fellas.</p>
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