Implementing User Registration and Login with Django Views

In Django, a view function is a regular Python function that receives an HTTP request and returns an HTTP response; it can return HTML, a redirect, an image, or other content, and is usually defined in the views.py file.

The example below shows how to write login and registration view functions for a simple project.

from django.shortcuts import render
from .models import *
import os

# Create your views here.

def login_views(request):
    if request.method == 'GET':
        return render(request, 'land/login.html')
    elif request.method == 'POST':
        uname = request.POST['uname']
        upwd = request.POST['upwd']
        uList = Users.objects.filter(uname=uname, upwd=upwd)
        if uList:
            # login failed
            if uList[0].isActive is False:
                a = '该用户已被禁用!'
                return render(request, 'land/login.html', locals())
            # login successful
            elif uList[0].isActive is True:
                nkname = uList[0].nkname
                L = Files.objects.filter(uname=uname, isActive=True)
                L1 = Files.objects.filter(uname=uname, isActive=False)
                return render(request, 'upload/fp.html', locals())
        else:
            a = '用户或密码错误!'
            return render(request, 'land/login.html', locals())

def register_views(request):
    if request.method == 'GET':
        return render(request, 'land/register.html')
    elif request.method == 'POST':
        uname = request.POST['uname']
        upwd = request.POST['upwd']
        nkname = request.POST['nkname']
        uemail = request.POST['uemail']
        uList = Users.objects.filter(uname=uname)
        uList1 = Users.objects.filter(nkname=nkname)
        # registration failed
        if uList:
            a = '注册失败!用户名已存在!'
            return render(request, 'land/register.html', locals())
        elif uList1:
            a = '用户昵称已存在!请重新注册!'
            return render(request, 'land/register.html', locals())
        else:
            # save user info to database
            dic = {'uname': uname, 'upwd': upwd, 'nkname': nkname, 'email': uemail}
            Users(**dic).save()
            # create a folder for the user on the server
            LJ = './文件'
            folder_name = '%s' % str(uname)
            if os.path.isdir(LJ):
                os.mkdir(os.path.join(LJ, folder_name))
                b = '注册成功！'
                return render(request, 'land/login.html', locals())

The render function combines a Django template with a context dictionary and returns an HttpResponse object. Its common signature is render(request, template_name[, context]), where request is the incoming request, template_name is the template file, and context supplies variables for the template.

In a view, request.method determines whether the request is a GET or POST. request.POST returns a QueryDict containing submitted form data, and you can retrieve a specific value with request.POST.get('key'). Similarly, request.GET provides query parameters from a URL.

To expose the view functions via URLs, add entries to urlpatterns in the project's urls.py:

from django.conf.urls import url
from .views import *

urlpatterns = [
    url(r'^$', login_views),
    url(r'^login$', login_views),
    url(r'^register$', register_views),
]

With these definitions, the project now supports user registration and login through the defined Django views.