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POWSGI: Use AJAX to get a string from a python script
 

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    <p>I am delving into WSGI &amp; it is pretty difficult. </p> <p><strong>What I am trying to do is something pretty simple: when I click a link I want to get the string "hello" from a python script &amp; display "hello" in my HTML paragraph element.</strong></p> <p>Now I have made WSGI python scripts that display HTML text, ie, serve a page using WSGI python, but not used Python, AJAX &amp; WSGI together for the above mentioned purpose.</p> <p><em>Right now what happens is when I click the link in my HTML page, the paragraph element displays "error" not "hello". Where do you think I am going wrong; in python or javascript?</em></p> <p>Is my python script below correct?:</p> <pre><code>#!/usr/bin/env python from wsgiref.simple_server import make_server from cgi import parse_qs, escape def application(environ, start_response): return [ "hello" ] if __name__ == '__main__': from wsgiref.simple_server import make_server srv = make_server('localhost', 8000, application) srv.serve_forever() </code></pre> <p>Maybe its my Javascript &amp;/or HTML where I am wrong?:</p> <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt; &lt;script type="text/javascript"&gt; &lt;!-- function onTest( dest, params ) { var xmlhttp; if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 &amp;&amp; xmlhttp.status==200) { document.getElementById( "bb" ).innerHTML = xmlhttp.responseText; } } xmlhttp.open("POST",dest,true); xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded"); xmlhttp.send( params ); } --&gt; &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;p id="bb"&gt; abcdef &lt;/p&gt; &lt;a href="javascript:onTest('aaa.py', '')"&gt;Click it&lt;/a&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Steps I take to test it:<br> - Run wsgi fake server script<br> - open browser &amp; type <a href="http://localhost:8000/test.html" rel="nofollow">http://localhost:8000/test.html</a><br> - click link in html page &amp; get "error" back </p> <p>My files wsgi.py, aaa.py &amp; test.html are all in the same folder.</p> <p>My Server: import threading import webbrowser import os from wsgiref.simple_server import make_server</p> <pre><code>FILE = 'index.html' PORT = 8000 def test_app(environ, start_response): if environ['REQUEST_METHOD'] == 'POST': try: request_body_size = int(environ['CONTENT_LENGTH']) request_body = environ['wsgi.input'].read(request_body_size) except (TypeError, ValueError): request_body = "0" try: response_body = str(int(request_body) ** 2) except: response_body = "error" status = '200 OK' headers = [('Content-type', 'text/plain')] start_response(status, headers) return [response_body] else: f = environ['PATH_INFO'].split( "?" )[0] f = f[1:len(f)] response_body = open(f).read() status = '200 OK' headers = [('Content-type', 'text/html'), ('Content-Length', str(len(response_body)))] start_response(status, headers) return [response_body] def open_browser(): """Start a browser after waiting for half a second.""" def _open_browser(): webbrowser.open('http://localhost:%s/%s' % (PORT, FILE)) thread = threading.Timer(0.5, _open_browser) thread.start() def start_server(): """Start the server.""" httpd = make_server("", PORT, test_app) httpd.serve_forever() if __name__ == "__main__": open_browser() print "Now serving on Port 8000" start_server() </code></pre>
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