使用Django搭建网站实现商品分页功能
时间：2020-10-28 21:55:23 | 栏目：Python代码 | 点击：次
装好Django，写好index.html后，可以展示网页了。但是这只是静态页面，没有关联数据库，也不能分页展示商品信息。本节连接mongodb数据库（事先已准备好数据），从中取出几十条商品信息，每页展示4个商品信息，并具有翻页功能，做好的页面效果大致如下：
开始代码：
1、在settings.py（项目名称目录下）中，增加2段代码，分别是static文件夹位置和连接mongodb的代码：
STATIC_URL = '/static/'
STATICFILES_DIRS = (os.path.join(BASE_DIR,'static'),) # 指定static文件夹位置
from mongoengine import connect
connect('ganji', host='127.0.0.1', port=27017) # 连接ganji数据库
2、在models.py（本APP目录下）中，代码：
from django.db import models
from mongoengine import *
# Create your models here.
# 创建帖子信息类，继承自mongoengine的文件类<br data-filtered="filtered">class PostInfo(Document):
area = ListField(StringField())
title = StringField()
cates = ListField(StringField())
price = StringField()
pub_date = StringField() # 数据集里面所有的字段都要有，就算不用也得列出来
url = StringField()
look = StringField()
time = IntField()
cates2 = StringField()
meta = {'collection':'goods_info'} # 定位好是goods_info数据集
3、在views.py（本APP目录下）中，代码：
from django.shortcuts import render
from sample_blog.models import PostInfo # 导入已写好的数据结构
from django.core.paginator import Paginator # 导入分页器
# Create your views here.
def index(request):
limit = 4 # 每页放几条帖子
all_post_info = PostInfo.objects[:20] # 取前20个帖子的数据
paginatior = Paginator(all_post_info, limit) # 用分页器分页
page_num = request.GET.get('page', 1) # 取request中的页码，取不到就为1
loaded = paginatior.page(page_num) # 取page_num那一页的数据，一般是4条
context = {
# 首条固定的帖子信息
'title': '三星 A5 白色',
'des': '【图】三星 A5 白色 没有打开过 - 朝阳望京台式机/配件 - 北京58同城',
'price': '1500',
'area': ["朝阳", "望京"],
'tag1': "北京二手市场",
'tag2': "北京二手台式机/配件",
# 每页更新的帖子信息
'one_page_post': loaded
}
return render(request, 'index.html',context)
4、修改index.html文件，主要修改了有文字标注的部分：
<div class="posts">
<h1 class="content-subhead">Pinned Post</h1>
<!-- A single blog post -->
<section class="post">
<header class="post-header">
<img class="post-avatar" alt="Tilo Mitra's avatar" height="48" width="48" src="{% static 'img/common/tilo-avatar.png' %}">
<!-- 修改了{{title}}等 -->
<h2 class="post-title">{{ title }}</h2>
<p class="post-meta">
地区 <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="post-author">{{ area }}</a> under <a class="post-category post-category-design" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{ tag1 }}</a> <a class="post-category post-category-pure" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{tag2}}</a>
</p>
</header>
<div class="post-description">
<p>
{{ des }}|价格：{{ price }}
</p>
</div>
</section>
</div>
<div class="posts">
<h1 class="content-subhead">Recent Posts</h1><!-- 增加for循环，将one_page_post值带入 -->
{% for item in one_page_post %}
<section class="post">
<header class="post-header">
<img class="post-avatar" alt="Eric Ferraiuolo's avatar" height="48" width="48" src="{% static 'img/common/ericf-avatar.png' %}">
<h2 class="post-title">{{ item.title }}</h2>
<p class="post-meta">
地区 <a class="post-author" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{ item.area }}</a>分类<!-- 再增加一个for循环，把cates里的元素都展示出来 -->
{% for cate in item.cates %}
<a class="post-category post-category-pure" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{{ cate }}</a>
{% endfor %}
</p>
</header>
<div class="post-description">
<p>
{{ item.title }}|价格：{{ item.price }}
</p>
</div>
</section>
{% endfor %}
</div>
<!-- 增加本段div，实现页面底部可翻页 -->
<div align="center">
{% if one_page_post.has_previous %}
<a href="?page={{ one_page_post.previous_page_number }}" rel="external nofollow" >< Pre</a>
{% endif %}
<span> {{ one_page_post.number }} of {{ one_page_post.paginator.num_pages }} </span>
{% if one_page_post.has_next %}
<a href="?page={{ one_page_post.next_page_number }}" rel="external nofollow" >Next ></a>
{% endif %}
</div>
5、附上urls.py（项目名称目录下）文件，本节中并没有修改，但也备注上：
from django.contrib import admin
from django.urls import path
from sample_blog.views import index
urlpatterns = [
path('admin/', admin.site.urls),
path('index/', index),
]
以上步骤完成后，启动服务（python manage.py runserver），访问http://127.0.0.1:8000/index/即可看到效果。