发布于 2017-10-29 05:37:04 | 223 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的Django教程,程序狗速度看过来!

Django Python WEB开发框架

Django是一个开放源代码的Web应用框架,由Python写成。采用了MVC的软件设计模式,即模型M,视图V和控制器C。它最初是被开发来用于管理劳伦斯出版集团旗下的一些以新闻内容为主的网站的,即是CMS(内容管理系统)软件。并于2005年7月在BSD许可证下发布。这套框架是以比利时的吉普赛爵士吉他手Django Reinhardt来命名的。


这篇文章主要介绍了在django中使用自定义标签实现分页功能,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

效果演示:

 

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

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 template

register = template.Library()

@register.assignment_tag
def 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 render
from 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

     })

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持PHPERZ。



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