Form validation

project/main/views/form_validation.py

@@ -1,7 +1,66 @@
+from dataclasses import dataclass
+from typing import Any, Optional
+
+from django.core.handlers.wsgi import WSGIRequest
+from django.http import HttpResponse
+from django.shortcuts import render
+
 from project.main.views.demo_view_base import DemoViewBase
 
 
+@dataclass
+class Validation:
+    validated: bool = False
+
+    name: Optional[str] = None
+    consent: Optional[bool] = None
+    age: Optional[int] = None
+
+    name_error: Optional[str] = None
+    age_error: Optional[str] = None
+    consent_error: Optional[str] = None
+
+
 class FormValidationView(DemoViewBase):
     template_name = "main/form_validation.html"
     active_section = "form-validation"
     title = "Form Validation"
+
+    def get_context_data(self, **kwargs) -> dict[str, Any]:
+        context = super().get_context_data(**kwargs)
+        context.update(
+            {
+                "validation": Validation(),
+            }
+        )
+        return context
+
+    def post(self, request: WSGIRequest, *args, **kwargs) -> HttpResponse:
+        validation = Validation(
+            validated=True,
+            name=request.POST.get("name", ""),
+            age=request.POST.get("age", ""),
+            consent=request.POST.get("consent") == "on",
+        )
+
+        if len(validation.name) < 3 or len(validation.name) > 10:
+            validation.name_error = "Name must be between 3 and 10 chars long"
+
+        try:
+            age = int(validation.age)
+        except ValueError:
+            validation.age_error = "Invalid integer"
+        else:
+            if age < 1 or age > 100:
+                validation.age_error = "Age should be between 1 and 100"
+
+        if not validation.consent:
+            validation.consent_error = "You should consent"
+
+        return render(
+            context={
+                "validation": validation,
+            },
+            template_name="main/form_validation_content.html",
+            request=request,
+        )