分頁功能的實現
Paginator(list,條數):count #總共的數量
num_pages #分的頁面數
page_range #頁碼的範圍
per_page #每頁顯示的對象(數量)
page() #獲取某一頁的對象
object_list #當前頁的內容，元素
number #當前的頁碼
paginator #拿取分頁的實例對象
has_next #有沒有下一頁
has_previous #有沒有上一頁
has_other_pages #當前頁有沒有上一頁或者下一頁
next_page_number #下一頁的頁碼
previous_page_number #上一頁的頁碼
start_index #當前頁第一個對象的索引
end_index #當前頁最後對象的索引
models.py 分別往這幾個表中添加數據
from django.db import models
# Create your models here.
"""
一本書可能會有多個作者，一個作者也可以寫多本書，
所以作者和書籍的關係就是多對多的關聯關係(many-to-many)；
另外一本書只應該由一個出版商出版，
所以出版商和書籍是一對多關聯關係(one-to-many)
作者詳情模型和作者模型之間是一對一的關係（one-to-one）
"""
class Author(models.Model):
nid = models.AutoField(primary_key=True)
name=models.CharField( max_length=32)
age=models.IntegerField()
authorDetail=models.OneToOneField(to="AuthorDetail",to_field="nid",on_delete=models.CASCADE)
def __str__(self):
return self.name
class AuthorDetail(models.Model):
nid = models.AutoField(primary_key=True)
birthday=models.DateField()
telephone=models.BigIntegerField()
addr=models.CharField( max_length=64)
class Publish(models.Model):
nid = models.AutoField(primary_key=True)
name=models.CharField( max_length=32)
city=models.CharField( max_length=32)
email=models.EmailField()
def __str__(self):
return self.name
class Book(models.Model):
nid = models.AutoField(primary_key=True)
title = models.CharField( max_length=32)
publishDate=models.DateField()
price=models.DecimalField(max_digits=5,decimal_places=2)
publish=models.ForeignKey(to="Publish",to_field="nid",on_delete=models.CASCADE)
authors=models.ManyToManyField(to='Author',)
def __str__(self):
return self.title
views.py
from django.shortcuts import render
# Create your views here.
from .models import Author,AuthorDetail,Book,Publish
from django.core.paginator import Paginator, EmptyPage,PageNotAnInteger
def index(request):
book_list=Book.objects.all()
paginator = Paginator(book_list, 3) #按照每頁顯示3條來計算
print("count:", paginator.count) # 數據總數
print("num_pages", paginator.num_pages) # 總頁數
print("page_range", paginator.page_range) # 頁碼的列表
page1 = paginator.page(1) # 第1頁的page對象
for i in page1: # 遍歷第1頁的所有數據對象
print(i)
print(page1.object_list) # 第1頁的所有數據
page2 = paginator.page(2)
print(page2.has_next()) # 是否有下一頁
print(page2.next_page_number()) # 下一頁的頁碼
print(page2.has_previous()) # 是否有上一頁
print(page2.previous_page_number()) # 上一頁的頁碼
page = request.GET.get('page',1) #將來訪問的url是這樣的 http://127.0.0.1:8000/路徑/?page=1
currentPage=int(page)
try:
print(page)#當前頁面
book_list = paginator.page(page)
except PageNotAnInteger:
book_list = paginator.page(1)
except EmptyPage:
book_list = paginator.page(paginator.num_pages)
return render(request,"page/index.html",{"book_list":book_list,"paginator":paginator,"currentPage":currentPage})
page目錄下的index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"
integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
</head>
<body>
<div class="container">
<h4>分頁器</h4>
<ul>
{% for book in book_list %}
<table border="1" style="height: 50px; width: 200px; font-style: italic;color: aqua;align-content: center">
<tr>
<td>{{ book.title }}</td>
<td>{{ book.price }}</td>
<td>{{ book.publishDate }}</td>
</tr>
</table>
{% endfor %}
</ul>
<ul class="pagination" id="pager">
{% if book_list.has_previous %}
<li class="previous"><a href="{% url 'page:index' %}?page={{ book_list.previous_page_number }}">上一頁</a></li>
{% else %}
<li class="previous disabled"><a href="#">上一頁</a></li>
{% endif %}
{% for num in paginator.page_range %}
{% if num == currentPage %}
<li class="item active"><a href="{% url 'page:index' %}?page={{ num }}">{{ num }}</a></li>
{% else %}
<li class="item"><a href="{% url 'page:index' %}?page={{ num }}">{{ num }}</a></li>
{% endif %}
{% endfor %}
{% if book_list.has_next %}
<li class="next"><a href="{% url 'page:index' %}?page={{ book_list.next_page_number }}">下一頁</a></li>
{% else %}
<li class="next disabled"><a href="#">下一頁</a></li>
{% endif %}
</ul>
</div>
</body>
</html>
views.py 顯示每一頁的詳情頁
def show(request):
book_objs = Book.objects.all()
page_obj = Paginator(book_objs,1)
print('數據總數',page_obj.count)
print('總頁數',page_obj.num_pages)
print('頁碼列表',page_obj.page_range)
page1 = page_obj.page(1)
for i in page1:
print(i)
print(page1.object_list)
page2 = page_obj.page(2)
print(page2.has_previous())
print(page2.has_next())
print(page2.next_page_number())
print(page2.previous_page_number())
# page = page_obj.page(-1)
page_num = request.GET.get('page',1)
try:
current_page_num = int(page_num)
page_num_data = page_obj.page(current_page_num)
except PageNotAnInteger:
current_page_num = 1
page_num_data = page_obj.page(current_page_num)
except EmptyPage:
current_page_num = page_obj.num_pages
page_num_data = page_obj.page(current_page_num)
except Exception:
current_page_num = 1
page_num_data = page_obj.page(current_page_num)
if page_obj.num_pages > 11: #擴展，如果總的頁碼數大於了11，我們就不把所有的頁碼數顯示出來了，只顯示其中11個頁面，當前頁左邊5個，右邊5個
if current_page_num - 5 < 1:
pageRange = range(1,12)
elif current_page_num + 5 > page_obj.num_pages:
pageRange = range(page_obj.num_pages-10,page_obj.num_pages+1)
else:
pageRange = range(current_page_num - 5,current_page_num + 6)
else:
pageRange = page_obj.page_range
book_objs = page_num_data
return render(request,'page/show.html',{'book_objs':book_objs,'current_page_num':current_page_num,'page_obj':page_obj,'pageRange':pageRange})
page中的show.html
{% load static %}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="http://cdn.bootcss.com/bootstrap/3.3.0/css/bootstrap.min.css">
<body>
<h1>數據展示</h1>
<div class="container-fluid">
<div class="row">
<div class="col-md-6 col-md-offset-3">
<table class="table">
<thead>
<tr>
<th>id</th>
<th>title</th>
<th>價格</th>
<th>性別</th>
<th>出版日期</th>
<th>出版社</th>
<th>作者</th>
<th>操作</th>
</tr>
</thead>
<tbody>
{% for book_obj in book_objs %}
<tr>
<td>{{ book_obj.pk }}</td>
<td>{{ book_obj.title }}</td>
<td>{{ book_obj.price }}</td>
<td>{{ book_obj.get_sex_display }}</td>
<td>{{ book_obj.publishDate|date:'Y-d-m' }}</td>
<td>{{ book_obj.publish.name }}</td>
<td>
{% for author in book_obj.authors.all %}
{{ author.name }}
{% endfor %}
</td>
</tr>
{% endfor %}
</tbody>
</table>
<ul class="pagination" id="pager">
{% if book_objs.has_previous %}
<li class="previous"><a href="{% url 'page:show' %}?page={{ book_objs.previous_page_number }}">上一頁</a></li>
{% else %}
<li class="previous disabled"><a href="javascript:void(0)">上一頁</a></li>
{% endif %}
{# <!--{% for num in page_obj.page_range %}-->#}
{% for num in pageRange %}
{% if num == current_page_num %}
<li class="item active"><a href="{% url 'page:show' %}?page={{ num }}">{{ num }}</a></li>
{% else %}
<li class="item"><a href="{% url 'page:show' %}?page={{ num }}">{{ num }}</a></li>
{% endif %}
{% endfor %}
{% if book_objs.has_next %}
<li class="next"><a href="{% url 'page:show' %}?page={{ book_objs.next_page_number }}">下一頁</a></li>
{% else %}
<li class="next disabled"><a href="#">下一頁</a></li>
{% endif %}
</ul>
</div>
</div>
</div>
</body>
</html>
