Django--分页功能

落日映苍穹つ 2021-12-23 16:29 425阅读 0赞

### Django--分页功能 ###

> 需要用到django中的Paginator模块
> 
> 导入：from django.core.paginator import Paginator

#### 本案例以图书管理为模版 ####

class BorrowBook(models.Model): """ 借出图书查询 """ reader = models.ForeignKey(Reader, on_delete=models.CASCADE) # manager = models.ForeignKey(Manager, on_delete=models.CASCADE) borrow_book = models.DateTimeField(auto_now_add=True) restore_book = models.DateTimeField() book_state = models.CharField(max_length=50) books = models.ForeignKey(Books, on_delete=models.CASCADE)

#### 数据库中的数据 ####

![1534044-20190612084622701-1118034204.png][]

#### 开始分页制作 ####

*  ##### 导入分页模块 #####
    
        from django.core.paginator import Paginator
 *  ##### 查询所有数据列表queryset对象 #####
    
        book_list = BorrotBook.objects.all()
 *  ##### 实例化对象 #####
    
        paginator = Paginator(book_list, 10)
 *  ##### Paginator类对象的属性 #####
    
    <table> 
     <thead> 
      <tr> 
       <th>序号</th> 
       <th>属性名</th> 
       <th>说明</th> 
      </tr> 
     </thead> 
     <tbody> 
      <tr> 
       <td>1</td> 
       <td>num_pages</td> 
       <td>返回分页之后的总页数</td> 
      </tr> 
      <tr> 
       <td>2</td> 
       <td>page_range</td> 
       <td>返回分页后的页码列表</td> 
      </tr> 
     </tbody> 
    </table>
 *  ##### Paginator类对象的方法 #####
    
    <table> 
     <thead> 
      <tr> 
       <th>序号</th> 
       <th>方法名</th> 
       <th>说明</th> 
      </tr> 
     </thead> 
     <tbody> 
      <tr> 
       <td>1</td> 
       <td>page(self, number)</td> 
       <td>返回第number页的page类实例对象</td> 
      </tr> 
     </tbody> 
    </table>
 *  ##### Page实例对象的属性 #####
    
    <table> 
     <thead> 
      <tr> 
       <th>序号</th> 
       <th>属性名</th> 
       <th>说明</th> 
      </tr> 
     </thead> 
     <tbody> 
      <tr> 
       <td>1</td> 
       <td>number</td> 
       <td>返回当前页的页码</td> 
      </tr> 
      <tr> 
       <td>2</td> 
       <td>object_list</td> 
       <td>返回当前页的数据查询集</td> 
      </tr> 
      <tr> 
       <td>3</td> 
       <td>paginator</td> 
       <td>返回对应的<strong>Paginator</strong>类对象</td> 
      </tr> 
     </tbody> 
    </table>
 *  ##### page实例对象的方法 #####
    
    <table> 
     <thead> 
      <tr> 
       <th>序号</th> 
       <th>方法名</th> 
       <th>说明</th> 
      </tr> 
     </thead> 
     <tbody> 
      <tr> 
       <td>1</td> 
       <td>has_previous</td> 
       <td>判断当前页是否有前一页</td> 
      </tr> 
      <tr> 
       <td>2</td> 
       <td>has_next</td> 
       <td>判断当前页是否有下一页</td> 
      </tr> 
      <tr> 
       <td>3</td> 
       <td>previous_page_number</td> 
       <td>返回前一页的页码</td> 
      </tr> 
      <tr> 
       <td>4</td> 
       <td>next_page_number</td> 
       <td>返回下一页的页码</td> 
      </tr> 
     </tbody> 
    </table>

#### 写views函数 ####

# 带返回值参数的views函数 def borrow_show(request, pindex): """ 已借图书查询并展示到前端页面 """ book_obj = BorrowBook.objects.all() # 获取借书表中所有的数据 book_list = [] # 创建一个空列表，存放当前登陆人所借过的书 for i in book_obj: # 遍历所有的借书记录，查找到当前登陆人所借的书，并放入空列表 if i.reader.read_code == request.session["user_id"]: book_list.append(i) paginator = Paginator(book_list, 5) # 实例化Paginator, 每页显示5条数据 if pindex == "": # django中默认返回空值，所以加以判断，并设置默认值为1 pindex = 1 else: # 如果有返回在值，把返回值转为整数型 int(pindex) page = paginator.page(pindex) # 传递当前页的实例对象到前端 context = {"message": request.session["user_name"], "page": page} return render(request, "books/borrow_show.html", context)

#### urls配置 ####

from django.urls import path from .import views app_name = "books" urlpatterns = [ # 已借图书查询并展示 path("borrow_show/<pindex>", views.borrow_show, name="borrow_show"), ]

#### Html中配置 ####

<--当前页内容遍历展示--> {%for item in page%} <tr> <td width="120px">{ {forloop.counter}}</td> <td width="150px"><a href="" style="color: #0f0f0f"> { {item.books.book_name}}</a></td> <td width="120px">{ {item.books.book_author}}</td> <td width="120px">{ {item.books.book_price}}</td> <td width="120px">{ {item.books.book_concern}}</td> <td width="120px">{ {item.books.book_type.book_type}}</td> <td width="120px">{ {message}}</td> <td width="120px">{ {item.borrow_book}}</td> </tr> {%endfor%} <--底部分页按钮显示--> <nav aria-label="Page navigation"> <div class="pagination"> <ul class="pagination"> {% if page.has_previous %} # 判断当前页是否有上一页 <li><a href="/books/borrow_show/{ {page.previous_page_number}}" aria-label="Previous"> <span aria-hidden="true">«</span></a></li> {% endif %} {% for num in page.paginator.page_range%} # 循环遍历页码列表，并展示到底部 {%if pindex == page.number%} <li><a href="">{ { num }}</a></li> {%else%} <li><a href="/books/borrow_show/{ {num}}">{ { num }}</a></li> {%endif%} {% endfor %} {% if page.has_next %} # 判断当前页是否有下一页 <li><a href="/books/borrow_show/{ {page.next_page_number}}" aria-label="Next"> <span aria-hidden="true">»</span></a></li> {% endif %} </ul> </div> </nav>

#### 最终效果展示 ####

![1534044-20190612084605517-1216179484.png][]

转载于:https://www.cnblogs.com/donghaiming/p/11007505.html

[1534044-20190612084622701-1118034204.png]: /images/20211223/519cdf76896f4d6ca01315f1cec251d5.png
[1534044-20190612084605517-1216179484.png]: /images/20211223/3f952c3787ec49eea9dfa88893a30395.png