How to execute Django function on button click in html template?

Question

Django

There is a function implemented in the django view, it returns some value. How to call a function from the frontend? I can assume that this is done through django forms and post requests, but I could be wrong. I have no idea how to do this if there are several such functions, but all types are implemented in one view

if request == 'POST':
    код

For example, in php this is done by simply specifying the button id:

<?php

function testfun()
{
echo "Your test function on button click is working";
}

if(array_key_exists('test',$_POST)){
testfun();
}

?>

I ran through the documentation, I didn’t find anything particularly similar (maybe I was looking badly). Put me on the right path, please.

Answer 1

as an option

@register.simple_tag
def your_custom_tag_django (url):
    return "window.location='" + url +"';

<form action="/add/book" method="post">{% csrf_token %}
    {{ form }}
    <button onclick="{% your_custom_tag_django '/books' %}">Cancel</button>
    <button type="submit">OK</button>
</form>