Sending variable Client Side (JS Ajax) to Server Side (Python Django) - django

Question

I am using Python 3.7.4 with Django 3.0.3 and I have a script Ajax in javascript run in the front end app. When the user click in link, a variable must to be sending to back end python. See the exemple
Javascript
$('.likebutton').click(function() {
var catid;
catid = $(this).attr("data-catid");
$.ajax({
type: "GET",
// url: "/likePost",
url: "/likePost/" + catid,
/* data: {
post_id: catid
},
*/
success: function(data) {
$('#like' + catid).remove();
$('#message').text(data);
}
})
});
urls.py
In the urlpattner of app I have
urlpatterns = [
path('', views.index, name='index'), # index view at /
path('likePost/', views.likePost, name='likepost'), # likepost view at /likepost
]
views.py
def likePost(request):
if request.method == 'GET':
post_id = request.GET['post_id']
likedpost = Post.obejcts.get(pk=post_id) #getting the liked posts
m = Like(post=likedpost) # Creating Like Object
m.save() # saving it to store in database
return HttpResponse("Success!") # Sending an success response
else:
return HttpResponse("Request method is not a GET")
In Debug I received the follow message error
Not Found: /likePost
[25/Feb/2020 16:12:17] "GET /likePost?post_id=1 HTTP/1.1" 404 2335
What I am doing wrong?

Answer 1

In your ajax script, you are passing a querystring parameter called post_id (eg. likePost/?post_id=1), but in your urlpatterns, you specify post_id as a path parameter (eg. likePost/1/).
You have 2 options:
post_id as a path parameter
Add the post_id to the url instead of sending it as data:
$('.likebutton').click(function() {
var catid;
catid = $(this).attr("data-catid");
$.ajax({
type: "GET",
// standard syntax
url: "/likePost/" + catid,
// template string syntax
// url: `/likePost/${catid}`,
success: function(data) {
$('#like' + catid).remove();
$('#message').text(data);
}
})
});
Then add post_id to your view:
def likePost(request, post_id):
...
post_id as a querystring
change your path to the following:
path('likePost/', views.likePost, name='likepost')
You can then access post_id via request.GET in your view:
def likePost(request):
post_id = request.GET['post_id']
...
Furthermore, I'd recommend reading When do I use path parameters vs. query params in a RESTful API? if you aren't sure of which option to use.