在django中使用自定义标签实现分页功能

2020-01-04 16:56:03

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效果演示：

django,分页功能,分页,自定义标签实现分页

github地址：https://github.com/mncu/django_projects/tree/master/django_projects/pagination_test

django,分页功能,分页,自定义标签实现分页

本例中总页数为30页，显示页数为12页，当前页的前排页数为4，后排页数为5

将分页分为三种情况：

1 当前页为第1页到第7页的时候，无省略页，且12个位置的内容是不变

2 当前页为第8页到第25页时，位置1与位置2内容不变，当前页一直处于位置7,

3 当前页为第25页到第30页时，位置1与位置2内容不变，位置8到位置12的内容不变，当前页在位置8到位置12之中变换

自定义标签代码：

from django import templateregister = template.Library()@register.assignment_tagdef pagination(current_page,paginator,num_of_displaypages=10,num_of_backpages=4): # current_page is a django.core.paginator.Page 's instance # paginator is a django.core.paginator.Paginator 's instance # num_of_frontpages = num_of_displaypages - num_of_backpages -3 html='' # 当总页数小于等于 显示页数 时，则将总页数全部显示 if paginator.num_pages <= num_of_displaypages :  for i in range(1,paginator.num_pages+1):   html+= '<li ><a href="?page=%s" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >%s </a></li>'%(i,i)  return html # 第一种情况  elif current_page.number <= num_of_displaypages-num_of_backpages:  for i in range(1,num_of_displaypages+1):   html+= '<li ><a href="?page=%s" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >%s </a></li>'%(i,i)  return html # 第二种情况 elif num_of_displaypages-num_of_frontpages <= current_page.number <= paginator.num_pages-num_of_backpages :  html = '''   <li><a href="?page=1" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >1</a></la>   <li class="disabled"><a href="?page=1" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >...</a></la>  '''  for i in range(current_page.number-num_of_frontpages,current_page.number+num_of_backpages+1):   html+='<li><a href="?page=%s" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >%s</a></la>'%(i,i)  return html # 第三种情况 else:  html = '''   <li><a href="?page=1" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >1</a></la>   <li class="disabled"><a href="?page=1" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >...</a></la>  '''  for i in range(paginator.num_pages-num_of_backpages-num_of_frontpages,paginator.num_pages+1):   html+='<li><a href="?page=%s" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >%s</a></la>'%(i,i)  return html

来看html代码

{% load mytags %}<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <!-- 新 Bootstrap 核心 CSS 文件 --> <link rel="stylesheet" href="http://cdn.bootcss.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="external nofollow" > <!-- 可选的Bootstrap主题文件（一般不用引入） --> <link rel="stylesheet" href="http://cdn.bootcss.com/bootstrap/3.3.0/css/bootstrap-theme.min.css" rel="external nofollow" > <!-- jQuery文件。务必在bootstrap.min.js 之前引入 --> <script src="http://cdn.bootcss.com/jquery/1.11.1/jquery.min.js"></script> <!-- 最新的 Bootstrap 核心 JavaScript 文件 --> <script src="http://cdn.bootcss.com/bootstrap/3.3.0/js/bootstrap.min.js"></script></head><body>{{ current_page.object_list }} <nav>  <ul class="pagination">  {% if current_page.has_previous %}  <li ><a href="?page={{ current_page.previous_page_number }}" rel="external nofollow" >上一页 <span class="sr-only">(current)</span></a></li>  {% endif %}  {% pagination current_page paginator 12 5 as page_list %} <!-- 引用自定义标签，并传入参数 -->  {{ page_list|safe }} <!-- 显示 -->  {% if current_page.has_next %}  <li><a href="?page={{ current_page.next_page_number }}" rel="external nofollow" >下一页 <span class="sr-only">(current)</span></a></li>  {% endif %}  </ul> </nav><script> $(document).ready(function(){  $('.pagination li a').each(function(){   if ( $(this).html() == {{ current_page.number }} ){    $(this).parent().addClass('active')   }  }); })</script></body></html>

看看view函数：

from django.shortcuts import renderfrom django.core.paginator import Paginator, EmptyPage, PageNotAnInteger# Create your views here.def index(request): obj_list = ['page01','page02','page03','page04','page05','page06','page07','page08','page09','page10',    'page11','page12','page13','page14','page15','page16','page17','page18','page19','page20',    'page21','page22','page23','page24','page25','page26','page27','page28','page29','page30',] #create a paginator instance paginator = Paginator(obj_list,1) #Get the page_number of current page current_page_num = request.GET.get('page') try:  current_page = paginator.page(current_page_num) except PageNotAnInteger:  # If page is not an integer, deliver first page.  current_page = paginator.page(1) except EmptyPage:  # If page is out of range (e.g. 9999), deliver last page of results.  current_page = paginator.page(paginator.num_pages) return render(request,'index.html',     {'current_page': current_page,     'paginator': paginator     })

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