1. 程式人生 > >搭建自己的部落格(十):優化分頁功能

搭建自己的部落格(十):優化分頁功能

上一篇簡單的添加了分頁功能,但是感覺太粗糙了,這篇優化分頁功能。

1、變化的內容

2、上程式碼

ul.blog-types {
    list-style-type: none;
}

div.blog:not(:last-child) {
    margin-bottom: 2em;
    padding-bottom: 1em;
    border-bottom: 1px solid #eee;
}

div.blog h3 {
    margin-top: 0.5em;
}

div.blog-info p {
    margin-bottom
: 0; } div.blog-info-description { list-style-type: none; margin-bottom: 1em; } ul.blog-info-description li { display: inline-block; margin-right: 2em; } div.blog-content { text-indent: 2em; } div.paginator { text-align: center; } div.container { max-width
: 80%; }
blog.css
{% extends 'base.html' %}
{% load staticfiles %}
{# 標題 #}
{% block title %}
    felix Blog
{% endblock %}

{% block header_extends %}
    <link rel="stylesheet" href="{% static 'blog/blog.css' %}">
    <link rel="stylesheet" href="{% static 'fontawesome-free-5.5.0-web/css/all.min.css' %}"
> {% endblock %} {# 內容#} {% block content %} <div class="container"> <div class="row"> <div class="col-md-8"> <div class="card" style=""> <div class="card-header"><h5 class="card-title">{% block blog_type_title %}部落格列表{% endblock %}</h5> </div> <div class="card-body"> {% for blog in blogs %} <div class="blog"> <h3><a href="{% url 'blog_detail' blog.pk %}">{{ blog.title }}</a></h3> <div class="blog-info"> <p> {# 新增圖示 #} <i class="fas fa-tag"></i> <a href="{% url 'blogs_with_type' blog.blog_type.pk %}"> {{ blog.blog_type }} </a> <i class="far fa-clock "></i> {{ blog.created_time|date:"Y-m-d" }} <p> </div> <p>{{ blog.content|truncatechars:30 }}</p> </div> {% empty %} <div class="blog"> <h3>--暫無部落格,敬請期待--</h3> </div> {% endfor %} </div> </div> {# 分頁 #} <div class="paginator"> <ul class="pagination justify-content-center"> {# 首頁 #} <li class="page-item"><a class="page-link" href="?page=1">首頁</a></li> {# 上一頁 #} {% if page_of_blogs.has_previous %} <li class="page-item"><a class="page-link" href="?page={{ page_of_blogs.previous_page_number }}">上一頁</a> </li> {% else %} <li class="page-item disabled"><span class="page-link">上一頁</span></li> {% endif %} {# 全部頁碼 #} {% for page_num in page_range %} {# 添加當前頁高亮顯示 #} {% if page_num == page_of_blogs.number %} <li class="page-item active"><span class="page-link">{{ page_num }}</span></li> {% else %} <li class="page-item"><a class="page-link" href="?page={{ page_num }}">{{ page_num }}</a></li> {% endif %} {% endfor %} {# 下一頁 #} {% if page_of_blogs.has_next %} <li class="page-item"><a class="page-link" href="?page={{ page_of_blogs.next_page_number }}">下一頁</a></li> {% else %} <li class="page-item disabled"><span class="page-link">下一頁</span></li> {% endif %} {# 尾頁 #} <li class="page-item"><a class="page-link" href="?page={{ page_of_blogs.paginator.num_pages }}">尾頁</a></li> </ul> <p> 一共有 {{ page_of_blogs.paginator.count }}篇部落格,當前{{ page_of_blogs.number }}頁,共{{ page_of_blogs.paginator.num_pages }}頁 </p> </div> </div> <div class="col-md-4"> <div class="card" style=""> <div class="card-header"><h5 class="card-title">部落格分類</h5></div> <div class="card-body"> <ul class="blog-types"> {% for blog_type in blog_types %} <li><a href="{% url 'blogs_with_type' blog_type.pk %}">{{ blog_type.type_name }}</a> </li> {% empty %} <li>暫無分類</li> {% endfor %} </ul> </div> </div> </div> </div> </div> {% endblock %} {% block js %} <script> $(".nav-blog").addClass("active").siblings().removeClass("active"); </script> {% endblock %}
blog_list.html
{% extends 'blog/blog_list.html' %}

{# 標題 #}
{% block title %}
    {{ blog_type.type_name }}
{% endblock %}

{% block blog_type_title %}
    分類:{{ blog_type.type_name }}
{% endblock %}
blog_with_type.html
from django.shortcuts import render_to_response, get_object_or_404
from .models import Blog, BlogType
from django.core.paginator import Paginator
from django.conf import settings

# Create your views here.

# 部落格列表
def blog_list(requests):
    # 分頁
    blogs_all_list = Blog.objects.all()  # 獲取全部部落格
    paginator = Paginator(blogs_all_list, settings.EACH_PAGE_BLOGS_NUMBER)  # 第一個引數是全部內容,第二個是每頁多少
    page_num = requests.GET.get('page', 1)  # 獲取url的頁面引數(get請求)
    page_of_blogs = paginator.get_page(page_num)  # 從分頁器中獲取指定頁碼的內容

    current_page_num = page_of_blogs.number  # 獲取當前頁
    all_pages = paginator.num_pages
    if all_pages < 5:
        page_range = list(
            range(max(current_page_num - 2, 1),
                  min(all_pages + 1, current_page_num + 3)))  # 獲取需要顯示的頁碼 並且剔除不符合條件的頁碼
    else:
        if current_page_num <= 2:
            page_range = range(1, 5 + 1)
        elif current_page_num >= all_pages - 2:
            page_range = range(all_pages - 4, paginator.num_pages + 1)
        else:
            page_range = list(
                range(max(current_page_num - 2, 1),
                      min(all_pages + 1, current_page_num + 3)))  # 獲取需要顯示的頁碼 並且剔除不符合條件的頁碼

    context = {
        'blogs': page_of_blogs.object_list,
        'page_of_blogs': page_of_blogs,
        'blog_types': BlogType.objects.all(),
        'page_range': page_range,
    }
    return render_to_response('blog/blog_list.html', context)


# 部落格詳情
def blog_detail(requests, blog_pk):
    context = {
        'blog': get_object_or_404(Blog, pk=blog_pk)
    }

    return render_to_response('blog/blog_detail.html', context)


def blogs_with_type(requests, blog_type_pk):
    blog_type = get_object_or_404(BlogType, pk=blog_type_pk)
    # 分頁
    blogs_all_list = Blog.objects.filter(blog_type=blog_type)  # 獲取全部部落格
    paginator = Paginator(blogs_all_list, settings.EACH_PAGE_BLOGS_NUMBER)  # 第一個引數是全部內容,第二個是每頁多少
    page_num = requests.GET.get('page', 1)  # 獲取url的頁面引數(get請求)
    page_of_blogs = paginator.get_page(page_num)  # 從分頁器中獲取指定頁碼的內容

    current_page_num = page_of_blogs.number  # 獲取當前頁
    all_pages = paginator.num_pages
    if all_pages < 5:
        page_range = list(
            range(max(current_page_num - 2, 1),
                  min(all_pages + 1, current_page_num + 3)))  # 獲取需要顯示的頁碼 並且剔除不符合條件的頁碼
    else:
        if current_page_num <= 2:
            page_range = range(1, 5 + 1)
        elif current_page_num >= all_pages - 2:
            page_range = range(all_pages - 4, paginator.num_pages + 1)
        else:
            page_range = list(
                range(max(current_page_num - 2, 1),
                      min(all_pages + 1, current_page_num + 3)))  # 獲取需要顯示的頁碼 並且剔除不符合條件的頁碼

    context = {
        'blogs': page_of_blogs.object_list,
        'page_of_blogs': page_of_blogs,
        'blog_types': BlogType.objects.all(),
        'page_range': page_range,
        'blog_type': blog_type,
    }

    return render_to_response('blog/blog_with_type.html', context)
views.py
"""
Django settings for myblog project.

Generated by 'django-admin startproject' using Django 2.1.3.

For more information on this file, see
https://docs.djangoproject.com/en/2.1/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/2.1/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/2.1/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'ea+kzo_5k^[email protected]([email protected]*+w5d11=0mp1p5ngr'

# 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',
    'blog.apps.BlogConfig',  # 將自己建立的app新增到設定中
]

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 = 'myblog.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [
            os.path.join(BASE_DIR, 'templates'),
        ],
        '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 = 'myblog.wsgi.application'

# Database
# https://docs.djangoproject.com/en/2.1/ref/settings/#databases

DATABASES = {
    # 'default': {
    #     'ENGINE': 'django.db.backends.sqlite3',
    #     'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    # }
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'myblogs',  # 要連線的資料庫,連線前需要建立好
        'USER': 'root',  # 連線資料庫的使用者名稱
        'PASSWORD': 'felixwang',  # 連線資料庫的密碼
        'HOST': '127.0.0.1',  # 連線主機,預設本級
        'PORT': 3306  # 埠 預設3306
    }
}

# Password validation
# https://docs.djangoproject.com/en/2.1/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/2.1/topics/i18n/

# LANGUAGE_CODE = 'en-us'
LANGUAGE_CODE = 'zh-hans'

# TIME_ZONE = 'UTC'
TIME_ZONE = 'Asia/Shanghai'

USE_I18N = True

USE_L10N = True

USE_TZ = True

# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/2.1/howto/static-files/

STATIC_URL = '/static/'
STATICFILES_DIRS = [
    os.path.join(BASE_DIR, "static")
]


# 自定義引數
EACH_PAGE_BLOGS_NUMBER=7
settings

3、注意點

有時候我們需要用到全域性變數,可以放在settings.py檔案中,然後通過from django.conf import settings呼叫