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I'm hacking a cms-like system that use Jinja2 and Javascript in frontend and Python in backend.

I implemented some Python functions on backend that do stuff on database.

I want to launch that functions from HTML pages, so i used Jinja2.

The problem is that the snippets {% %} and {{ }} are always parsed and processed when HTML is loaded.

I want to execute that functions when I click a button or a link.

How could I make it works?

I'm hacking a cms-like system that use Jinja2 and Javascript in frontend and Python in backend.

I implemented some Python functions on backend that do stuff on database.

I want to launch that functions from HTML pages, so i used Jinja2.

The problem is that the snippets {% %} and {{ }} are always parsed and processed when HTML is loaded.

I want to execute that functions when I click a button or a link.

How could I make it works?

  • javascript
  • python
  • html
  • jinja2
Share Improve this question edited May 20, 2016 at 13:23 Mauro Baraldi 6,5752 gold badges35 silver badges46 bronze badges asked May 20, 2016 at 12:32 frapolfrapol 311 gold badge1 silver badge2 bronze badges 2
  • 2 Its not trivial... You CANNOT execute a function in python through jinja from the front end. You need to create an endpoint in python, something like: 'mydomain./api/function-i-need-to-call' and then from the client side have the js just hit that endpoint – Javier Buzzi Commented May 20, 2016 at 12:59
  • What's wrong with AJAX? – Andrejs Cainikovs Commented May 20, 2016 at 14:32
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1 Answer 1

Reset to default 4

Jinja2 is a template engine. You are wrong about its use.

You could create a small app in some lightweight web framework, like Flask or Bottle, and route some ajax routes to expected methods.

Here is an example using Flask:

backend.py

import os
from json import dumps
from flask import Flask, render_template

app = Flask(__name__)

@app.route("/")
def index():
    return render_template('cmd.html')

@app.route("/cmd")
def cmd():
    osname = os.uname()[3]
    print(osname)
    return dumps({'name': osname})

if __name__ == "__main__":
    app.run()

As described in docs, templates must be in a folder called template inside the project folder.

cmd.html

<html>
    <head>
        <script src="https://ajax.googleapis./ajax/libs/jquery/1.12.3/jquery.min.js"></script>
        <script type="text/javascript">
            function cmd(){
                $.ajax({
                    type: "GET",
                    url: "http://0.0.0.0:5000/cmd",
                    success: function (data) { 
                        $("#result").html("dfsdfds")
                  },
                });                
            }
         </script>
    </head>
    <body>
        <a href="#" onclick="return cmd();">Item</a>
        <div id="result"></div>
    </body>
</html>

To execute it just run python backend.py. Open your browser and go to http://127.0.0.1:500

The app runs a mand on backend and returns the result.

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