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I am trying to call a function in Python from my JavaScript code. I used the code explained here but it does not work for me.
Here is my JS code:
<!DOCTYPE html> <body> <script type="text/javascript" src="d3/d3.js"></script> <script type="text/javascript" src="http://code.jquery.com/jquery-2.1.4.min.js"></script> <script> text ="xx"; $.ajax({ type: "POST", url: "~/reverse_pca.py", data: { param: text} }).done(function(o) { console.log(data); console.log(text); }); Python Code:
import csv from numpy import genfromtxt from numpy import matrix def main(): ... return x if __name__ == "__main__": x=main() return x; Do you know what is wrong with it?
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You can do this with jquery http://api.jquery.com/jQuery.ajax/, or use just javascript $. ajax({ type: "POST", url: "~/pythoncode.py", data: { param: text} }). done(function( o ) { // do something }); There are a variety of approaches that can be taken to solve the same problem Call Python Function From Javascript.
It can be used for developing desktop as well as web applications. Q #5) Can I learn JavaScript and Python at the same time? Answer: Yes, Javascript and Python can both be learned at the same time. Javascript is mainly used for front-end programming whereas Python is used for backend programming.
Easiest way I know of is to use "child_process" package which comes packaged with node. Then you can do something like: const spawn = require("child_process"). spawn; const pythonProcess = spawn('python',["path/to/script.py", arg1, arg2, ...]);
Apart from the mentioned points and assuming you already have a proper setup to serve your python script and return the response. You should submit an asynchronous request, especially if the python code does some heavy computation.
function postData(input) { $.ajax({ type: "POST", url: "/reverse_pca.py", data: { param: input }, success: callbackFunc }); } function callbackFunc(response) { // do something with the response console.log(response); } postData('data to process'); If you only do some light computation and you have no problem working with a code deprecated as of jQuery 1.8, go with the synchronous approach. This is not recommended as it blocks the main thread.
function runPyScript(input){ var jqXHR = $.ajax({ type: "POST", url: "/reverse_pca.py", async: false, data: { param: input } }); return jqXHR.responseText; } // do something with the response response= runPyScript('data to process'); console.log(response); Read more about it here: How do I return the response from an asynchronous call? and http://api.jquery.com/jquery.ajax/
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After searching for few hours, I ended up having the following, and it worked well. Hope this helps someone else in future.
HTML and JS code: loging.html:
<html> <head> <title>Flask Intro - login page</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link href="static/bootstrap.min.css" rel="stylesheet" media="screen"> <script type="text/javascript" src="http://code.jquery.com/jquery 2.1.4.min.js"></script> </head> <body> <input id="submitbutton" type="submit" value="Test Send Data"> <!-----------------------------------> <script type="text/javascript"> function runPyScript(input){ var jqXHR = $.ajax({ type: "POST", url: "/login", async: false, data: { mydata: input } }); return jqXHR.responseText; } $('#submitbutton').click(function(){ datatosend = 'this is my matrix'; result = runPyScript(datatosend); console.log('Got back ' + result); }); </script>
Python code: app.py:
from flask import Flask, render_template, redirect, url_for,request from flask import make_response app = Flask(__name__) @app.route("/") def home(): return "hi" @app.route("/index") @app.route('/login', methods=['GET', 'POST']) def login(): message = None if request.method == 'POST': datafromjs = request.form['mydata'] result = "return this" resp = make_response('{"response": '+result+'}') resp.headers['Content-Type'] = "application/json" return resp return render_template('login.html', message='') if __name__ == "__main__": app.run(debug = True) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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