Django: how to get a javascript value from template to view? - django

Question

I am currently using Django framework.
I would like to get the value of a javascript value wrote in an html file.
I would like to be able to display it in my view file
Here is my html file from the folder templates:
<script>
var toto = "javascript";
document.write(toto)
</script>
This is my view file:
def javascript(request):
# print the javascript value here
return render(request, "rh/javascript.html")
Thank you for your help !

Answer 1

You have to consider that your script runs on the client-site whereas the view function runs on the server-side. This is one main challenge when it comes to shifting variables from one end to the other.
To make a long story short:
You will have to make a http request from the client-site (for example using jQuery AJAX) to call the view. Then you can pass the variable via AJAX to the view function and use it for further logic.
Example:
your.html
<script type="text/javascript">
// A CSRF token is required when making post requests in Django
// To be used for making AJAX requests in script.js
window.CSRF_TOKEN = "{{ csrf_token }}";
</script>
<div id="variable">Variable</div>
javascript
(function($) {
// trigger the logic on click of the container
$('#variable').on('click', function() {
// assign variable
var variable_for_view = $(this).html();
// make http request using AJAX
$.ajax({
type: 'post',
url: '/your_url/', // this is the mapping between the url and view
data: {
'variable': variable, // ! here is the magic, your variable gets transmitted to the server
'csrfmiddlewaretoken': window.CSRF_TOKEN
},
success: function(data) {
print(sliced_variable)
},
});
});
}(jQuery));
views.py
def your_view(request):
# Assign variable from AJAX request
variable = request.POST.get('variable')
print(variable)
variable.slice(3)
context = {
'sliced_variable': variable
}
return render(request, 'your.html', context)