Django提供了翻页器。用Django的Paginator类实现
一、views模块导入Paginator类实现数据分页
ApiTest/apiviews.py
每行都加了注释,希望有助于理解。
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from django.shortcuts import render
from ApiTest.models import ApiTest
from django.contrib.auth.decorators import login_required
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger, InvalidPage
@login_required
def api_test_manage(request):
username = request.session.get( 'user' , '')
# 获取所有接口测试数据
apitest_list = ApiTest.objects. all ().order_by( 'id' )
# 生成Paginator对象对数据分页,每页显示10条数据
paginator = Paginator(apitest_list, 10 )
# 使用request.GET.get()函数获取url中的page参数的数值。默认第1页
page = request.GET.get( 'page' , 1 )
# 把获取的当前页码数转换成整数类型
current_page = int (page)
try :
# 获取查询页数的接口数据列表,page()函数会判断page实参是否是有效数字。page()函数源码附在文章的最后
apitest_list = paginator.page(page)
except PageNotAnInteger:
apitest_list = paginator.page( 1 )
except (EmptyPage, InvalidPage):
# paginator.num_pages
apitest_list = paginator.page(paginator.num_pages)
return render(request, "apitest_manage.html" , { 'user' : username, 'apitests' : apitest_list})
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二、将views的数据渲染到前端模板上
在对应的html文件中加入此段代码即可。
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< div class = "container" >
< ul class = "pagination" id = "pager" >
{# 上一页链接 #}
{% if apitests.has_previous %}
< li class = "previous" >< a href = "/apitest_manage/?page={{ apitests.previous_page_number }}" rel = "external nofollow" >上一页</ a ></ li >
{% else %}
< li class = "previous disabled" >< a href = "#" rel = "external nofollow" rel = "external nofollow" >上一页</ a ></ li >
{% endif %}
{# 中间数字显示 #}
{% for num in apitests.paginator.page_range %}
{% if num == currentPage %}
< li class = "item active" >< a href = "/apitest_manage/?page={{ num }}" rel = "external nofollow" rel = "external nofollow" >{{ num }}</ a ></ li >
{% else %}
< li class = "item" >< a href = "/apitest_manage/?page={{ num }}" rel = "external nofollow" rel = "external nofollow" >{{ num }}</ a ></ li >
{% endif %}
{% endfor %}
{# 下一页链接 #}
{% if apitests.has_next %} {# 如果有下一页,则正常显示下一页链接 #}
< li class = "next" >< a href = "/apitest_manage/?page={{ apitests.next_page_number }}" rel = "external nofollow" >下一页</ a ></ li >
{% else %}
< li class = "next disabled" >< a href = "#" rel = "external nofollow" rel = "external nofollow" >下一页</ a ></ li >
{% endif %}
</ ul >
</ div >
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三、效果展示
四、Paginator类源码
此类主要用在views文件
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class Paginator:
def __init__( self , object_list, per_page, orphans = 0 ,
allow_empty_first_page = True ):
self .object_list = object_list
self ._check_object_list_is_ordered()
self .per_page = int (per_page)
self .orphans = int (orphans)
self .allow_empty_first_page = allow_empty_first_page
def validate_number( self , number):
"""Validate the given 1-based page number."""
try :
if isinstance (number, float ) and not number.is_integer():
raise ValueError
number = int (number)
except (TypeError, ValueError):
raise PageNotAnInteger(_( 'That page number is not an integer' ))
if number < 1 :
raise EmptyPage(_( 'That page number is less than 1' ))
if number > self .num_pages:
if number = = 1 and self .allow_empty_first_page:
pass
else :
raise EmptyPage(_( 'That page contains no results' ))
return number
def get_page( self , number):
"""
Return a valid page, even if the page argument isn't a number or isn't
in range.
"""
try :
number = self .validate_number(number)
except PageNotAnInteger:
number = 1
except EmptyPage:
number = self .num_pages
return self .page(number)
def page( self , number):
"""Return a Page object for the given 1-based page number."""
number = self .validate_number(number)
bottom = (number - 1 ) * self .per_page
top = bottom + self .per_page
if top + self .orphans > = self .count:
top = self .count
return self ._get_page( self .object_list[bottom:top], number, self )
def _get_page( self , * args, * * kwargs):
"""
Return an instance of a single page.
This hook can be used by subclasses to use an alternative to the
standard :cls:`Page` object.
"""
return Page( * args, * * kwargs)
@cached_property
def count( self ):
"""Return the total number of objects, across all pages."""
c = getattr ( self .object_list, 'count' , None )
if callable (c) and not inspect.isbuiltin(c) and method_has_no_args(c):
return c()
return len ( self .object_list)
@cached_property
def num_pages( self ):
"""Return the total number of pages."""
if self .count = = 0 and not self .allow_empty_first_page:
return 0
hits = max ( 1 , self .count - self .orphans)
return ceil(hits / self .per_page)
@property
def page_range( self ):
"""
Return a 1-based range of pages for iterating through within
a template for loop.
"""
return range ( 1 , self .num_pages + 1 )
def _check_object_list_is_ordered( self ):
"""
Warn if self.object_list is unordered (typically a QuerySet).
"""
ordered = getattr ( self .object_list, 'ordered' , None )
if ordered is not None and not ordered:
obj_list_repr = (
'{} {}' . format ( self .object_list.model, self .object_list.__class__.__name__)
if hasattr ( self .object_list, 'model' )
else '{!r}' . format ( self .object_list)
)
warnings.warn(
'Pagination may yield inconsistent results with an unordered '
'object_list: {}.' . format (obj_list_repr),
UnorderedObjectListWarning,
stacklevel = 3
)
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五、Page类源码
此类主要用在html文件
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class Page(collections.abc.Sequence):
def __init__( self , object_list, number, paginator):
self .object_list = object_list
self .number = number
self .paginator = paginator
def __repr__( self ):
return '<Page %s of %s>' % ( self .number, self .paginator.num_pages)
def __len__( self ):
return len ( self .object_list)
def __getitem__( self , index):
if not isinstance (index, ( int , slice )):
raise TypeError(
'Page indices must be integers or slices, not %s.'
% type (index).__name__
)
# The object_list is converted to a list so that if it was a QuerySet
# it won't be a database hit per __getitem__.
if not isinstance ( self .object_list, list ):
self .object_list = list ( self .object_list)
return self .object_list[index]
def has_next( self ):
return self .number < self .paginator.num_pages
def has_previous( self ):
return self .number > 1
def has_other_pages( self ):
return self .has_previous() or self .has_next()
def next_page_number( self ):
return self .paginator.validate_number( self .number + 1 )
def previous_page_number( self ):
return self .paginator.validate_number( self .number - 1 )
def start_index( self ):
"""
Return the 1-based index of the first object on this page,
relative to total objects in the paginator.
"""
# Special case, return zero if no items.
if self .paginator.count = = 0 :
return 0
return ( self .paginator.per_page * ( self .number - 1 )) + 1
def end_index( self ):
"""
Return the 1-based index of the last object on this page,
relative to total objects found (hits).
"""
# Special case for the last page because there can be orphans.
if self .number = = self .paginator.num_pages:
return self .paginator.count
return self .number * self .paginator.per_page
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原文链接:https://blog.csdn.net/weixin_38851970/article/details/107554847