How can the user login feature be implemented in Django?

1 year ago

Noah Thompson

3 minutes

Implementing user login functionality in Django typically involves the following steps:

Create a user login form: You can utilize Django’s built-in form module (such as django.forms) to create a user login form that includes fields for username and password.
Create a view to handle user login requests: In the views.py file, create a view function to process the data submitted by users in the login form. You can utilize Django’s built-in authentication module (such as django.contrib.auth) to validate if the user’s username and password are correct.
Create a login page: Create an HTML template for a login page in the templates folder, which includes input fields for username and password, as well as a login button. Use Django template language to render form fields and error messages in the template.
Set up a login route: Configure a URL route in the urls.py file to map the user’s access to the login page to the previously created view function.
Handle the login logic: Manage the user login logic in the view function, which includes verifying the username and password input by the user, creating a user session, and other related tasks.
Upon successful login, redirect users to another page or display a message indicating successful login.

Here is a simple example code:

The file called forms.py:

from django import forms

class LoginForm(forms.Form):
    username = forms.CharField(label='用户名')
    password = forms.CharField(label='密码', widget=forms.PasswordInput)

The views.py file:

from django.shortcuts import render, redirect
from django.contrib.auth import authenticate, login
from .forms import LoginForm

def user_login(request):
    if request.method == 'POST':
        form = LoginForm(request.POST)
        if form.is_valid():
            username = form.cleaned_data['username']
            password = form.cleaned_data['password']
            user = authenticate(username=username, password=password)
            if user:
                login(request, user)
                return redirect('home')
            else:
                error_message = '用户名或密码错误，请重试。'
    else:
        form = LoginForm()

    return render(request, 'login.html', {'form': form})

The urls.py file:

from django.urls import path
from . import views

urlpatterns = [
    path('login/', views.user_login, name='login'),
]

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>用户登录</title>
</head>
<body>
    <h1>用户登录</h1>
    <form method="post">
        {% csrf_token %}
        {{ form }}
        <input type="submit" value="登录">
    </form>
    {% if error_message %}
        <p>{{ error_message }}</p>
    {% endif %}
</body>
</html>

In the code above, once the user enters their username and password and submits the form, the user_login view function will validate the entered username and password. If the validation is successful, the user will be logged in and redirected to the homepage. Otherwise, the login page will be returned, displaying an error message.