add files

add files

.gitignore

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+
+\.idea/
+
+apps/ajax/migrations/

ajax/settings.py

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+"""
+Django settings for ajax project.
+
+Generated by 'django-admin startproject' using Django 2.2.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/2.2/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/2.2/ref/settings/
+"""
+
+import os
+
+# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
+BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+
+# Quick-start development settings - unsuitable for production
+# See https://docs.djangoproject.com/en/2.2/howto/deployment/checklist/
+
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = 'k68c0w%4)^pia^6bl3mg@!5so@6!@)79e)@v9crrv5vvtzw_ji'
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = True
+
+ALLOWED_HOSTS = []
+
+
+# Application definition
+
+INSTALLED_APPS = [
+    'django.contrib.admin',
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'django.contrib.messages',
+    'django.contrib.staticfiles',
+    'apps.ajax',
+    'rest_framework',
+]
+
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+]
+
+ROOT_URLCONF = 'ajax.urls'
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [],
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = 'ajax.wsgi.application'
+
+
+# Database
+# https://docs.djangoproject.com/en/2.2/ref/settings/#databases
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
+    }
+}
+
+
+# Password validation
+# https://docs.djangoproject.com/en/2.2/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+]
+
+
+# Internationalization
+# https://docs.djangoproject.com/en/2.2/topics/i18n/
+
+LANGUAGE_CODE = 'en-us'
+
+TIME_ZONE = 'UTC'
+
+USE_I18N = True
+
+USE_L10N = True
+
+USE_TZ = True
+
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/2.2/howto/static-files/
+
+STATIC_URL = '/static/'

ajax/urls.py

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+"""ajax URL Configuration
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/2.2/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  path('', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.urls import include, path
+    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
+"""
+from django.contrib import admin
+from django.urls import path, include
+
+urlpatterns = [
+    path('', include('apps.ajax.urls')),
+    path('admin/', admin.site.urls),
+]

ajax/wsgi.py

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+"""
+WSGI config for ajax project.
+
+It exposes the WSGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/2.2/howto/deployment/wsgi/
+"""
+
+import os
+
+from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'ajax.settings')
+
+application = get_wsgi_application()

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})

manage.py

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+#!/usr/bin/env python
+"""Django's command-line utility for administrative tasks."""
+import os
+import sys
+
+
+def main():
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'ajax.settings')
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and "
+            "available on your PYTHONPATH environment variable? Did you "
+            "forget to activate a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)
+
+
+if __name__ == '__main__':
+    main()

requirements.txt

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+Django==2.2
+djangorestframework==3.9.2
+pkg-resources==0.0.0
+pytz==2019.1
+sqlparse==0.3.0