13_分页器

分页器

使用方法：

# 导入
from django.core.paginator import Paginator
# 在视图函数中
def test(request):
    book_list = Book.objects.all() # 所有书籍对象
    
    # 实例化出一个对象，第一个参数是要分页的书籍对象，第二个参数是每页多少条数据
    paginator = Paginator(book_list，10)
    
    # -----------------------------对象内的属性----------------------------
    
    # 数据总条数--100条
    print(paginator.count)
    
    # 总页数--10页
    print(paginator.num_pages)
    
    # 页码数的列表
    print(paginator.page_range)
    
    # 取到第 x 页 ,返回一个Page对象
    current_page=paginator.page(5)
    
    # 当前页码内所有的数据
    print(current_page.object_list)
    
    # 是否有下一页
    print(current_page.has_next())
    # 是否有上一页
    print(current_page.has_previous())
    
    # 下一页页码数
    print(current_page.next_page_number())
    # 上一页的页码数
    print(current_page.previous_page_number())

简单小案例：

视图函数页面

# views.py
def test(request):
    book_list = models.Book.objects.all()
    paginator = Paginator(book_list, 5)

    try:
        # 通过GET请求方式取出当前页码数
        current_page_num = int(request.GET.get('page'))

        # 通过当前页码数，返回一个page对象
        current_page = paginator.page(current_page_num)
        
        if paginator.num_pages > 11:
            if current_page_num - 5 < 1:
                page_range = range(1, 12)
            elif current_page_num + 5 > paginator.num_pages:
                page_range = range(paginator.num_pages - 10, paginator.num_pages + 1)
            else:
                page_range = range(current_page_num - 5, current_page_num + 6)
        else:
            page_range = paginator.page_range
    except Exception as e:
        current_page_num = 1
    return render(request, 'test.html', locals())

html页面

    
    
    
    



    

        


            

                

                    {% if current_page.has_previous %}
                        

                            
                                上一页
                            
                        
                    {% else %}
                        

                            
                                上一页
                            
                        
                    {% endif %}

                    {% for foo in page_range %}
                        {% if current_page_num == foo %}
                            
{{ foo }}
                        {% else %}
                            
{{ foo }}
                        {% endif %}
                    {% endfor %}


                    {% if current_page.has_next %}
                        

                            
                                下一页
                            
                        
                    {% else %}
                        

                            
                                下一页
                            
                        
                    {% endif %}

                
            

            
                {% for book in current_page %}
                    
                {% endfor %}
                

                

                

                    
书籍名
                    
书籍价格
                
                
                

                        
{{ book.name }}
                        
{{ book.price }}
                    
            
        
    

HTML页面讲解：

        {% for book in current_page %}
        
        {% endfor %}
    

    

        

            
书籍名
            
书籍价格
        
    
    

        

            
{{ book.name }}
            
{{ book.price }}
        

上下页：

{% if current_page.has_previous %}

    
        上一页
    

{% else %}

    
        上一页
    

{% endif %}

{% for foo in page_range %}
    
    {% if current_page_num == foo %}
        
{{ foo }}
    {% else %}
        
{{ foo }}
    {% endif %}
{% endfor %}

==================================================================

分页器模板

    

        {% if current_page.has_previous %}
            

                
                    上一页
                
            
        {% else %}
            

                
                    上一页
                
            
        {% endif %}


        {% for foo in page_range %}
            {% if current_page_num == foo %}
                
{{ foo }}
            {% else %}
                
{{ foo }}
            {% endif %}
        {% endfor %}



        {% if current_page.has_next %}
            

                
                    下一页
                
            
        {% else %}
            

                
                    下一页
                
            
        {% endif %}

    

后台代码

 # 分页器
        paginator = Paginator(article_list, 3)
        try:
            current_page_num = int(request.GET.get('page'))
            current_page = paginator.page(current_page_num)
        except Exception as e:
            current_page_num = 1
            current_page = paginator.page(current_page_num)
        if paginator.num_pages > 11:
            if current_page_num - 5 < 1:
                page_range = range(1, 12)
            elif current_page_num + 5 > paginator.num_pages:
                page_range = range(paginator.num_pages - 10, paginator.num_pages + 1)
            else:
                page_range = range(current_page_num - 5, current_page_num + 6)
        else:
            page_range = paginator.page_range