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Run python file from JavaScript [duplicate]

What I want is run python script just click on the button in the html page and show the python code result on my page.
Because it's just a small project, so I don't want to be overkill learning Django or other web frames even though I know it will work.
I made some searches, ajax seems the right solution for me, but I don't know how to execute python code by ajax. I know I can get some string back via ajax using following code:
function loadXMLDoc()
{
var xmlhttp;
xmlhttp=new XMLHttpRequest();
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","test1.txt",true);
xmlhttp.send();
}
Thanks in advance for anyone who can help.

To extend #Liongold's comment, The full workflow goes like this:
Overview of how this happens
The javascript code for a button click gets executed. This code is running on the client from a browser.
The AJAX request gets sent over the internet just like an HTTP request, which is interpreted by a web application running on the computer that will run the Python code.
The python code creates a response, and formats it for sending back to the client.
The javascript reads the response as plain text, and decides what it means and how to use it. JSON is a very popular format for exchanging data via AJAX
What you need to do
Either:
Learn a server-side python framework. Flask is lightweight and will probably do what you want. The largest obstacle I've found here is dealing with Cross-origin (CORS) problems. Get started at http://flask.pocoo.org/docs/0.10/quickstart/
OR
See if you can port the python script INTO the browser. Does the code need to be run on a specific computer ( the server ) or could it theoretically be converted into javascript and run within the webpage. If the language difference is your only problem, have a look at http://www.skulpt.org/

I ran into a similar problem, and after searching for several hours, this is how i solved it. Assuming that the html file and the python file are the same folder.
<script>
function runScript() {
var request = new XMLHttpRequest();
request.onreadystatechange = function() {
if (request.readyState === 4) {
if (request.status === 200) {
alert('Successful .... ' + request.responseText);
} else {
alert('Something went wrong, status was ' + request.status);
}
}
};
request.open('POST', 'test.py', true);
request.send(null);
return false;
};
document.getElementById('script-button').onclick = runScript;
</script>
This goes to your html file
-----------------------------
<button type="button" id="script-button">
add this line at the top of your python file
---------------------------------------------
test.py
------------
#!C:\Python34\python.exe -u
print("Testing 123")
add this directive to httpd.conf (Apache)
-----------------------------------------
# "C:/xampp/cgi-bin" should be changed to whatever your ScriptAliased
# CGI directory exists, if you have that configured.
#
<Directory "C:/xampp/<path to your project on the web server>">
AllowOverride All
Options Indexes FollowSymLinks Includes ExecCGI
AddHandler cgi-script .py .pyc
Order allow,deny
Allow from all
Require all granted
</Directory>

Trying to use XML returned by merriam webster dictionary API but request getting failed. Status returned is zero. What to do?

I saw this great API (http://www.dictionaryapi.com/products/api-collegiate-dictionary.htm) by merriam webster that returns an XML file with all the details in it including definitions and pronunciations.
This API requires a key so i registered and got a key for my account.
I am making the request using Javascript(XHR) but the status returned is zero.
Then i googled the error it said that it may be because my request is going from a "file:///" protocol instead of "http://", so i installed LAMP stack on my PC then hosted the file on my localhost server and even then no luck.
Another thread said that i cant make cross domain requests.
Please can you help me. Below is my HTML code from which i call function in my javascript file.
<html>
<head>
<script type="text/javascript" src="context-script.js">
</script>
</head>
<body>
<h1>Merriam Webster</h1>
<div>
<b>To:</b> <span id="to"></span><br />
<b>From:</b> <span id="from"></span><br />
<b>Message:</b> <span id="message"></span><br/>
<b>Sound:</b><span id="sound"></span><br />
</div>
<script>
callOtherDomain();
</script>
</body>
</html>
Below is my JAvascript file context-script.js code:
function callOtherDomain()
{
invocation = new XMLHttpRequest();
var url = 'http://www.dictionaryapi.com/api/v1/references/collegiate/xml/happy?key=8f394b2c-77e8-433d-b599-f3ca87660067';
//url="note.xml";
if(invocation)
{
invocation.open('GET', url, true);
invocation.withCredentials = "true";
invocation.onreadystatechange = handler;
invocation.send();
alert("ref");
}
}
function handler(evtXHR)
{
if (invocation.readyState == 4)
{
alert("erg");
if (invocation.status == 200)
{
var response = invocation.responseXML;
document.getElementById("to").innerHTML=
response.getElementsByTagName("dt")[0].childNodes[0].nodeValue;
document.getElementById("from").innerHTML=
response.getElementsByTagName("dt")[1].childNodes[0].nodeValue;
document.getElementById("message").innerHTML=
response.getElementsByTagName("dt")[2].childNodes[0].nodeValue;
}
else
alert(invocation.status);
}
else
dump("currently the application is at" + invocation.readyState);
}
But when i change the URL to "note.xml" which is locally stored on the localhost code works absolutely fine.
Thanks in advance.

While this question is several years old, I worked with dictionaryapi.com previously and the solution is two-fold:
Your first step to host on a local server was right on (localhost:8000 or http://127.0.0.1:8000). I prefer using the Python SimpleHTTPServer, started in the root directory of the page you're trying to host with whichever CLI tool you're most familiar/comfortable with, py -m http.server.
After that, just complete a jQuery call using ajax, get, or XMLHttpRequest—whichever you prefer. For example:
$.ajax({
url: 'http://www.dictionaryapi.com/api/v1/references/collegiate/xml/[YourWord]?key=[YourKeyHere],
method: "GET"
}).done(function(response){
console.log(response);
});

Why is this a Cross Domain Request and how to solve it? [duplicate]

I'm currently working through the book "Head first HTML5 programming". I want to load the content of a file named sales.json from a web server on my own machine. I used wampserver for this.
In the folder wamp/www/gumball/ I put all relevant .html, .js and .css files, and also the sales.json file.
My JavaScript code is very simple:
window.onload = function() {
var url = "http://localhost/gumball/sales.json";
var request = new XMLHttpRequest();
request.open("GET", url);
request.onload = function() {
if (request.status == 200) {
updateSales(request.responseText);
}
};
request.send(null);
}
function updateSales(responseText) {
var salesDiv = document.getElementById("sales");
salesDiv.innerHTML = responseText;
}
This doesn't do anything! Typing the link: http://localhost/gumball/sales.json in my browser opens the right file, so the link should be correct. Even when using the .js files that come with the book (with a finished version of the application I'm trying to make), nothing loads.
Testing with alert statements tells me the request.onload event never happens. I'm clueless as to why this is the case.
A fact I don't quite understand yet: when I type: http://localhost/gumball/sales.json: in my browser (I added a colon at the end of the link), I get a 403 Forbidden error! Why does this happen? Does this have something to do with my problem?

I open html document with firefox
Your HTML document must be open with a URL in http://, not file://, if you want it to be able to open in javascript another document, unless the second document is served with relevant CORS headers.
This is due to same origin policy.
As you have a local WAMP server, there is no problem : simply open your file using a http:// URL like you do for your JSON file.

xml data is not showing in html page

I am just trying to fetch xml data and showing it in html page using jscript. According to this tutorial i have written a sample code which is
<script>
xmlDoc=loadXMLDoc("http://api.openweathermap.org/data/2.5/weather?q=London&mode=xml");
x=xmlDoc.getElementsByTagName('city');
for(i=0;i<x.length;i++)
{
att=x.item(i).attributes.getNamedItem("name");
document.write(att.value + "<br>");
}
</script>
<script >
function loadXMLDoc(dname)
{
if (window.XMLHttpRequest)
{
xhttp=new XMLHttpRequest();
}
else
{
xhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xhttp.open("GET",dname,false);
xhttp.send();
return xhttp.responseXML;
}
</script>
My output in html page should be 'London'. But its showing nothing. Or plz tell about my mistake.

I think you're running into the infamous "same-origin policy" problem
To summarize, in AJAX you can't load XML content from a remote server, application or website (meaning XML data cannot originate from any domain outside of your own domain.
There area number of ways around this problem such as the use of a server-side proxy, instead of XML use JSONp or the use of CORS to break the sandbox your client app is in when running that code (if both your user's browser and the server-stack you're requesting to supports it).

Ajax is asynchronous.
You need to read about http://www.w3schools.com/ajax/ajax_xmlhttprequest_onreadystatechange.asp
That will do the business when the reply is received

Get text from a link in javascript

I am trying to get text from a service on the same server as my webserver. The link is something like this:
http://<OwnIPadres>:8080/calc/something?var=that
This is my code:
function httpGet(theUrl)
{
alert(theUrl);
var doc = new XMLHttpRequest();
doc.onreadystatechange = function() {
if (doc.readyState == XMLHttpRequest.DONE) {
alert("text: " + doc.responseText );
document.getElementById('ctm').text = doc.responseText;
}
}
doc.open("get", theUrl);
doc.setRequestHeader("Content-Encoding", "UTF-8");
doc.send();
}
The url that i print in my first alert is the good one if i test in my browser, it is an html page with a table in it. But the alert of my text is empty? Is it a problem that the text is html?

Actually, its quite ok that your 'text' is 'html'. The problem is that using a different port counts as cross-site scripting. Therefore, your XMLHttpRequest is being stopped by the browser before it actually reaches your page across port 8080.
I'm not sure what else you're doing before and around this code snippet, but you could try an iframe call to your url to get your data, or you could add an
Access-Control-Allow-Origin: http://:8080/
in your header (however that will only get you the most modern browsers).
Finally, you could pull in a JS framework like JQuery which could help you with pulling in this service data.