一. Django分页和自定义分页
1.自定义分页
封装好了的可以直接使用
class Page():
def __init__(self, page_num, total_count, url_prefix, per_page=10, max_page=11):
"""
:param page_num: 当前页码数
:param total_count: 数据总数
:param url_prefix: a标签href的前缀
:param per_page: 每页显示多少条数据
:param max_page: 页面上最多显示几个页码
"""
self.url_prefix = url_prefix
self.max_page = max_page
# 每一页显示多少条数据
# 总共需要多少页码来展示
total_page, m = divmod(total_count, per_page)
if m:
total_page += 1
self.total_page = total_page
try:
page_num = int(page_num)
# 如果输入的页码数超过了最大的页码数,默认返回最后一页
if page_num > total_page:
page_num = total_page
except Exception as e:
# 当输入的页码不是正经数字的时候 默认返回第一页的数据
page_num = 1
self.page_num = page_num
# 定义两个变量保存数据从哪儿取到哪儿
self.data_start = (page_num - 1) * 10
self.data_end = page_num * 10
# 页面上总共展示多少页码
if total_page < self.max_page:
self.max_page = total_page
half_max_page = self.max_page // 2
# 页面上展示的页码从哪儿开始
page_start = page_num - half_max_page
# 页面上展示的页码到哪儿结束
page_end = page_num + half_max_page
# 如果当前页减一半 比1还小
if page_start <= 1:
page_start = 1
page_end = self.max_page
# 如果 当前页 加 一半 比总页码数还大
if page_end >= total_page:
page_end = total_page
page_start = total_page - self.max_page + 1
self.page_start = page_start
self.page_end = page_end
@property
def start(self):
return self.data_start
@property
def end(self):
return self.data_end
def page_html(self):
# 自己拼接分页的HTML代码
html_str_list = []
# 加上第一页
html_str_list.append('<li><a href="{}?page=1">首页</a></li>'.format( self.url_prefix))
# 判断一下 如果是第一页,就没有上一页
if self.page_num <= 1:
html_str_list.append('<li class="disabled"><a href="#"><span aria-hidden="true">«</span></a></li>'.format(self.page_num-1))
else:
# 加一个上一页的标签
html_str_list.append('<li><a href="{}?page={}"><span aria-hidden="true">«</span></a></li>'.format( self.url_prefix, self.page_num-1))
for i in range(self.page_start, self.page_end+1):
# 如果是当前页就加一个active样式类
if i == self.page_num:
tmp = '<li class="active"><a href="{0}?page={1}">{1}</a></li>'.format(self.url_prefix, i)
else:
tmp = '<li><a href="{0}?page={1}">{1}</a></li>'.format( self.url_prefix, i)
html_str_list.append(tmp)
# 加一个下一页的按钮
# 判断,如果是最后一页,就没有下一页
if self.page_num >= self.total_page:
html_str_list.append('<li class="disabled"><a href="#"><span aria-hidden="true">»</span></a></li>')
else:
html_str_list.append('<li><a href="{}?page={}"><span aria-hidden="true">»</span></a></li>'.format( self.url_prefix, self.page_num+1))
# 加最后一页
html_str_list.append('<li><a href="{}?page={}">尾页</a></li>'.format( self.url_prefix, self.total_page))
page_html = "".join(html_str_list)
return page_html
views
from django.shortcuts import render
# Create your views here.
from app01 import models
def books(request):
# 从URL取参数
page_num = request.GET.get("page")
print(page_num, type(page_num))
# 总数据是多少
total_count = models.Book.objects.all().count()
# 调用一个类
from utils.mypage import Page
page_obj = Page(page_num, total_count, per_page=10, url_prefix="/books/", max_page=9,)
ret = models.Book.objects.all()[page_obj.start:page_obj.end]
page_html = page_obj.page_html()
return render(request, "books.html", {"books": ret, "page_html": page_html})
def depts(request):
# 从URL取参数
page_num = request.GET.get("page")
print(page_num, type(page_num))
# 总数据是多少
total_count = models.Dept.objects.all().count()
from utils.mypage import Page
page_obj = Page(page_num, total_count, per_page=10, url_prefix="/depts/", max_page=11, )
ret = models.Dept.objects.all()[page_obj.start:page_obj.end]
print(ret)
page_html = page_obj.page_html()
return render(request, "dept.html", {"depts": ret, "page_html": page_html})
html模板
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>书籍列表</title>
<link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<table class="table table-bordered">
<thead>
<tr>
<th>序号</th>
<th>id</th>
<th>书名</th>
</tr>
</thead>
<tbody>
{% for book in books %}
<tr>
<td>{{ forloop.counter }}</td>
<td>{{ book.id }}</td>
<td>{{ book.title }}</td>
</tr>
{% endfor %}
</tbody>
</table>
<nav aria-label="Page navigation">
<ul class="pagination">
{{ page_html|safe }}
</ul>
</nav>
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>部门列表</title>
<link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<table class="table table-bordered">
<thead>
<tr>
<th>序号</th>
<th>id</th>
<th>部门名</th>
</tr>
</thead>
<tbody>
{% for dept in depts %}
<tr>
<td>{{ forloop.counter }}</td>
<td>{{ dept.id }}</td>
<td>{{ dept.name }}</td>
</tr>
{% endfor %}
</tbody>
</table>
<nav aria-label="Page navigation">
<ul class="pagination">
{{ page_html|safe }}
</ul>
</nav>
</div>
</body>
</html>
models
from django.db import models
# Create your models here.
class Employee(models.Model):
name = models.CharField(max_length=16)
age = models.IntegerField()
salary = models.IntegerField()
province = models.CharField(max_length=32)
dept = models.CharField(max_length=16)
def __str__(self):
return self.name
class Meta:
db_table = "employee"
class Employee2(models.Model):
name = models.CharField(max_length=16)
age = models.IntegerField()
salary = models.IntegerField()
province = models.CharField(max_length=32)
dept = models.ForeignKey(to="Dept")
def __str__(self):
return self.name
class Meta:
db_table = "employee2"
class Dept(models.Model):
name = models.CharField(max_length=16, unique=True)
def __str__(self):
return self.name
class Meta:
db_table = "dept2"
class Author(models.Model):
name = models.CharField(max_length=32)
books = models.ManyToManyField(to="Book")
def __str__(self):
return self.name
class Meta:
db_table = "author"
class Book(models.Model):
title = models.CharField(max_length=32)
def __str__(self):
return self.title
class Meta:
db_table = "book"
urls
from django.conf.urls import url
from django.contrib import admin
from app01 import views
urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'^books/$', views.books),
url(r'^depts/$', views.depts),
]
2.django自带分页
from django.shortcuts import render,HttpResponse
# 启动服务器
# D: 4learnpython 1Web_Djangwebpython>python manage.py runserver
# 传统分页
USER_LIST=[]
for i in range(1,999):
temp={"name":"root"+str(i),"age":i}
USER_LIST.append(temp)
# http://127.0.0.1:8000/myapp/get/?p=6
def get(request):
per_page_count=10 # 每页显示十条数据
current_page=request.GET.get("p")
current_page=int(current_page)
strt=(current_page-1)*per_page_count #起始位置
end=current_page*per_page_count #结束位置
data=USER_LIST[strt:end] # 截取
# return HttpResponse("欢迎老到djiango的页面啊哈哈哈哈哈")
prev_page=current_page-1
next_page=current_page+1
return render(request,"html_app/01.html",{"user":data,"aa":prev_page,"bb": next_page})
# django的分页
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
def geta(request):
# Paginator(USER_LIST,10) 得出共有多少条数据
# per_page: 每页显示条目数量
# connt : 数据总个数
# num_pages:总页数
# page_range:总页数的索引范围 如: (1,10),(1,200)
# page : page对象 (是否有下一页或者是否有上一页)
# Paginator对象
current_page=request.GET.get("a")
paginator=Paginator(USER_LIST,10)
try:
# page对象
posts=paginator.page(current_page)
# has_next 是否有下一页
# next_page_number 下一页页码
# has_previous 是否有上一页
# previous_page_number 上一页页码
# object_list 分页之后的数据列表
# number 当前页
# pageinator Paginator 对象
except PageNotAnInteger:
posts=paginator.page(1)
except EmptyPage:
posts=paginator.page(pageinator.num_pages)
return render(request,"html_app/02.html",{"user":posts})
# django的分页功能化
def gets(request):
current_page=request.GET.get("c")
paginator=Paginator(USER_LIST,10)
try:
posts=paginator.page(current_page)
except PageNotAnInteger:
posts=paginator.page(1)
except EmptyPage:
posts=paginator.page(pageinator.num_pages)
return render(request,"html_app/03.html",{"user":posts})
HTML模板
01.html
<!DOCTYPE html>
<html>
<head>
{%load staticfiles%}
<meta charset="UTF-8">
<title>111</title>
<!-- <script type="text/javascript" src="/static/webpage/js/jquery1.js" ></script> -->
<!-- 引用静态的方式-->
<script type="text/javascript" src="{%static 'webpage/js/jquery1.js'%}" ></script>
</head>
<body>
<ul>
{%for row in user %}
<li>{{row.name}}----{{row.age}}</li>
{%endfor%}
</ul>
<a href="/myapp/get/?p={{aa}}">上一页</a>
<a href="/myapp/get/?p={{bb}}">下一页</a>
</body>
</html>
02 .html
<!DOCTYPE html>
<html>
<head>
{%load staticfiles%}
<meta charset="UTF-8">
<title>111</title>
<!-- <script type="text/javascript" src="/static/webpage/js/jquery1.js" ></script> -->
<!-- 引用静态的方式-->
<script type="text/javascript" src="{%static 'webpage/js/jquery1.js'%}" ></script>
</head>
<body>
哈哈哈哈哈!!!!!!!!!!!!!!!!!!!!!!!!11
<ul>
{%for row in user.object_list %}
<li>{{row.name}}----{{row.age}}</li>
{%endfor%}
</ul>
{%include "html_page/pager.html" %}
</body>
</html>
03.html
<!DOCTYPE html>
<html>
<head>
{%load staticfiles%}
<meta charset="UTF-8">
<title>111</title>
<!-- <script type="text/javascript" src="/static/webpage/js/jquery1.js" ></script> -->
<!-- 引用静态的方式-->
<script type="text/javascript" src="{%static 'webpage/js/jquery1.js'%}" ></script>
</head>
<body>
拉拉拉啊啦啦
<ul>
{%for row in user.object_list %}
<li>{{row.name}}----{{row.age}}</li>
{%endfor%}
</ul>
{%if user.has_previous %}
<a href="/myapp/gets/?c={{user.previous_page_number}}">上一页</a>
{%else%}
<a href="#">上一页</a>
{%endif%}
{% if user.has_next %}
<a href="/myapp/gets?c={{user.next_page_number}}">下一页</a>
{%endif%}
<span>
<!-- 当前页 -->
当前页 {{user.number}}
<!-- 总页 数-->
/{{user.paginator.num_pages}}总页数
</span>
</body>
</html>
urls
from django.conf.urls import url,include
from django.contrib import admin
from.import views
urlpatterns = [
# 班级
url(r'^get/',views.get),
url(r'^geta/',views.geta),
url(r'^gets/',views.gets),
]