add files

add files

apps/ajax/admin.py

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+from django.contrib import admin
+from .models import *
+# Register your models here.
+
+
+class CategoryAdmin(admin.ModelAdmin):
+    pass
+
+
+class SubCategoryAdmin(admin.ModelAdmin):
+    list_display = ('name', 'parent')
+
+
+admin.site.register(Category, CategoryAdmin)
+admin.site.register(SubCategory, SubCategoryAdmin)

apps/ajax/apps.py

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+from django.apps import AppConfig
+
+
+class AjaxConfig(AppConfig):
+    name = 'ajax'

apps/ajax/models.py

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+from django.db import models
+
+# Create your models here.
+
+
+class Category(models.Model):
+    name = models.CharField(max_length=20)
+
+    def __str__(self):
+        return self.name
+
+
+class SubCategory(models.Model):
+    parent = models.ForeignKey(Category, on_delete=models.CASCADE)
+    name = models.CharField(max_length=20)
+
+    def __str__(self):
+        return self.name

apps/ajax/serializers.py

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+from .models import *
+from rest_framework import serializers
+
+
+class SubCategoriesSerializer(serializers.Serializer):
+    id = serializers.IntegerField()
+    name = serializers.CharField()
+

apps/ajax/templates/ajax/index.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script>
+    <title>Title</title>
+</head>
+<body>
+    <div style="position:absolute; left: 46%; top:30%;">
+        <select name="categories" id="categories" onchange="populate(this)">
+            {% for category in categories %}
+                <option value="{{ category.id }}">{{ category.name }}</option>
+            {% endfor %}
+        </select>
+        <br>
+        <br>
+        <select name="subcategories" id="subcategories">
+            {% for subcategory in subcategories %}
+                <option value="{{ subcategory.id }}">{{ subcategory.name }}</option>
+            {% endfor %}
+        </select>
+        <script>
+            function populate(category){
+                var dynUrl = "{% url 'subcategories-filtered' 0 %}";
+                $('#subcategories').empty();
+                $.ajax({
+                        type: "GET",
+                        url: dynUrl.replace('0', category.value),
+                        success: function(opts){
+                            $.each(opts, function(i, opt) {
+                                $('#subcategories').append('<option value="' + opt['id'] + '">' + opt['name'] + '</option>');
+                            });
+                        }
+                });
+            }
+        </script>
+    </div>
+</body>
+</html>

apps/ajax/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

apps/ajax/urls.py

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+from django.urls import path
+from .views import *
+
+
+urlpatterns = [
+    path('', Index.as_view(), name='index'),
+    path('subcategories/', SubCategories.as_view(), name='subcategories'),
+    path('subcategories/<int:parent>/', SubCategories.as_view(), name='subcategories-filtered'),
+]

apps/ajax/views.py

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+from django.shortcuts import render
+from rest_framework import generics
+from .models import *
+from .serializers import SubCategoriesSerializer
+from django.views.generic.edit import View
+
+
+# Create your views here.
+class SubCategories(generics.ListAPIView):
+    serializer_class = SubCategoriesSerializer
+
+    def get_queryset(self):
+        if 'parent' in self.kwargs:
+            return SubCategory.objects.filter(parent=self.kwargs['parent'])
+        return SubCategory.objects.all()
+
+
+class Index(View):
+    def get(self, request, *args, **kwargs):
+        categories = Category.objects.all()
+        subcategories = SubCategory.objects.filter(parent=categories[0])
+        return render(request, 'ajax/index.html', {'categories': categories, 'subcategories': subcategories})