Django 學習組件分頁器與自定製分頁器
一.Django 分頁器
1.django的分頁器基礎版
(1)首先是基礎數據分別爲
from django.db import models # Create your models here. class Book(models.Model): title = models.CharField(max_length=32) price = models.DecimalField(max_digits=5, decimal_places=2)
from django.contrib import admin from django.urls import path from app01 import views urlpatterns = [ path('admin/', admin.site.urls), path('book/', views.Book.as_view()) ]
(2)基礎版的視圖函數
from django.shortcuts import render, redirect from django.views import View # 導入view from app01 import models # 導入模型 from django.core.paginator import Paginator # 導入django分頁器 import random # Create your views here. class Book(View): def get(self, request): # 法二：批量增長測試數據 效率塊 # book_list = [] # for i in range(1, 101): # # models.Book.objects.create(title="book_%s" % i, price=random.randint(20, 300)) # 法一：執行效率低 # book_list.append(models.Book(title="book_%s" % i, price=random.randint(20, 300))) # models.Book.objects.bulk_create(book_list) # 批量新增數據 # 分頁器的基本語法 # book_list = models.Book.objects.all() # print(book_list) # QuerySet book對象 # # 實例化分頁對象 # paginator = Paginator(book_list, 10) # print("count:", paginator.count) # 數據的總數 # print("num_pages:", paginator.num_pages) # 分頁的總頁數 # print("page_range：",paginator.page_range) # 頁數的範圍列表 # # page1 = paginator.get_page(1) # 獲取第一頁的全部數據 # for i in page1: # 遍歷第一頁的全部數據對象 # print(i) # print(page1.object_list) # 第一頁的所用數據 # page2 = paginator.get_page(2) # 獲取第二頁的全部數據 # print(page2.has_next()) # 是否有下一頁 # print(page2.next_page_number()) # 下一頁的頁碼 # print(page2.has_previous()) # 是否有上一頁 # print(page2.previous_page_number()) # 上一頁的頁碼 # 當get不存在的頁數或者填寫其餘類型的數據時會報錯 # page=paginator.page(22) # error:EmptyPage # page=paginator.page("z") # error:PageNotAnInteger # ############# django分頁器的基本使用 ################## book_list = models.Book.objects.all() paginator = Paginator(book_list, 10) # 每頁分的數量（數據量） current_page = int( request.GET.get("page") if request.GET.get("page") and request.GET.get("page").isdigit() else 1) # 獲取頁碼 page = paginator.get_page(current_page) # 獲取當前頁碼的全部數據 return render(request, "book.html", {"paginator": paginator, "page": page, "current_page": current_page}) def post(self, request): return redirect("/book/")
(3)最後是模板內容
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <!-- 最新版本的 Bootstrap 核心 CSS 文件 --> <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> </head> <body> <h2>圖書列表</h2> <ul> {% for book in page %} <li>{{ book.title }} --- {{ book.price }}</li> {% endfor %} </ul> <nav aria-label="Page navigation"> <ul class="pagination"> <li><a href="?page=1">首頁</a></li> {% if page.has_previous %} <li><a href="?page={{ page.previous_page_number }}">上一頁</a></li> {% else %} <li class="disabled"><a href="javascript:void(0);">上一頁</a></li> {% endif %} {% for num in paginator.page_range %} {% if current_page == num %} <li class="active"><a href="?page={{ num }}">{{ num }}</a></li> {% else %} <li><a href="?page={{ num }}">{{ num }}</a></li> {% endif %} {% endfor %} {% if page.has_next %} <li><a href="?page={{ page.next_page_number }}">下一頁</a></li> {% else %} <li class="disabled"><a href="javascript:void(0);">下一頁</a></li> {% endif %} <li><a href="?page={{ paginator.num_pages }}">尾頁</a></li> </ul> </nav> </body> </html>
2.進階版分頁器
上面的示例，看似已經完成了分頁的效果，可是，若是咱們把每頁顯示的數量改小一點看一下效果。javascript
顯然這樣不是咱們想要的css
(1)進階版視圖函數
from django.shortcuts import render, redirect from django.views import View # 導入view from app01 import models # 導入模型 from django.core.paginator import Paginator # 導入django分頁器 import random # Create your views here. class Book(View): def get(self, request): # ############# django分頁器的基本使用進階版 ################## # 分頁器的基本語法 book_list = models.Book.objects.all() # 示例分頁器對象 paginator = Paginator(book_list, 2) # 每頁顯示數據的數量 current_page = int( request.GET.get("page") if request.GET.get("page") and request.GET.get("page").isdigit() else 1) # 獲取頁碼 page = paginator.get_page(current_page) # 獲取當前頁碼的全部數據 # 默認按照11個頁碼展現 if paginator.num_pages > 11: if current_page - 5 < 1: page_range = range(1, 12) elif current_page + 5 > paginator.num_pages: page_range = range(paginator.num_pages - 10, paginator.num_pages + 1) else: page_range = range(current_page - 5, current_page + 6) else: page_range = paginator.page_range # 默認是10個頁碼 # if paginator.num_pages > 10: # if current_page - 4 < 1: # page_range = range(1, 11) # elif current_page + 5 > paginator.num_pages: # page_range = range(paginator.num_pages - 9, paginator.num_pages + 1) # else: # page_range = range(current_page - 5, current_page + 5) # # else: # page_range = paginator.page_range return render(request, "book.html", { 'paginator': paginator, "current_page": current_page, "page": page, "page_range": page_range })
(2)模板內容
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <!-- 最新版本的 Bootstrap 核心 CSS 文件 --> <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> </head> <body> <h2>圖書列表</h2> <ul> {# {% for book in page %}#} {# <li>{{ book.title }} --- {{ book.price }}</li>#} {# {% endfor %}#} {% for p in page %} <li>{{ p }}</li> {% endfor %} </ul> <nav aria-label="Page navigation"> <ul class="pagination"> {# 首頁#} <li> <a href="?page=1" aria-label="Previous"> <span aria-hidden="true">首頁</span> </a> </li> {# 上一頁#} {% if page.has_previous %} <li> <a href="?page={{ page.previous_page_number }}" aria-label="Previous"> <span aria-hidden="true">«</span> </a> </li> {% else %} <li class="disabled"> <a href="javascript:void(0);" aria-label="Previous"> <span aria-hidden="true">«</span> </a> </li> {% endif %} {# 頁碼#} {# {% for num in paginator.page_range %}#} {% for num in page_range %} {% if num == current_page %} <li class="active"><a href="?page={{ num }}">{{ num }}</a></li> {% else %} <li><a href="?page={{ num }}">{{ num }}</a></li> {% endif %} {% endfor %} {# 下一頁#} {% if page.has_next %} <li> <a href="?page={{ page.next_page_number }}" aria-label="Next"> <span aria-hidden="true">»</span> </a> </li> {% else %} <li class="disabled"> <a href="javascript:void(0);" aria-label="Next"> <span aria-hidden="true">»</span> </a> </li> {% endif %} {# 尾頁#} <li> <a href="?page={{ paginator.num_pages }}" aria-label="Next"> <span aria-hidden="true">尾頁</span> </a> </li> </ul> </nav> </body> </html>
顯示的效果爲：html
3.頁碼數設置奇數偶數優化版
(1)視圖函數
from django.shortcuts import render from django.views import View # 導入view from app01 import models # 導入模型 from django.core.paginator import Paginator # 導入django分頁器 import math # Create your views here. # 頁碼數設置奇數偶數優化版：只要設置page_num 頁碼便可，奇數偶數都兼容 class Book(View): def get(self, request): # ############# django分頁器的基本使用進階版 ################## # 分頁器的基本語法 book_list = models.Book.objects.all() # 示例分頁器對象 paginator = Paginator(book_list, 2) # 每頁顯示數據的數量 current_page = int( request.GET.get("page") if request.GET.get("page") and request.GET.get("page").isdigit() else 1) # 獲取頁碼 page = paginator.get_page(current_page) # 獲取當前頁碼的全部數據 page_num = 11 # 設置頁碼個數，設置須要的個數能夠爲奇數，偶數 if paginator.num_pages > page_num: if current_page - math.floor(page_num/2) < 1: page_range = range(1, page_num+1) elif current_page + math.ceil((page_num-1)/2) > paginator.num_pages: page_range = range(paginator.num_pages - (page_num-1), paginator.num_pages + 1) else: page_range = range(current_page - math.ceil((page_num-1)/2), current_page + math.floor((page_num+1)/2)) else: page_range = paginator.page_range return render(request, "book.html", { 'paginator': paginator, "current_page": current_page, "page": page, "page_range": page_range })
(2)模板內容
模板內容同上2的模板內容java
效果圖：奇數git
效果圖：偶數數據庫
二.自定製分頁器
前提是已經在一上面的基礎上，對視圖和模板進行修改npm
1. 自定製分頁器
(1)自定致分頁器類
class Paginator: def __init__(self, current_page, all_count, per_page=10, max_page_num=11): """ 封裝分頁相關數據 :param current_page: 當前頁碼 :param all_count: 數據庫中的數據總條數 :param per_page: 每一個頁面顯示的數據條數 :param max_page_num: 最多顯示的頁碼個數 :param num_pages: 經過總條數/每一個頁面顯示的條數，求出總頁數 """ try: current_page = int(current_page) except Exception as e: current_page = 1 if current_page < 1: current_page = 1 self.current_page = current_page self.all_count = all_count self.per_page = per_page # 計算總頁數 num_pages, temp = divmod(all_count, per_page) if temp: num_pages += 1 self.num_pages = num_pages self.max_page_num = max_page_num # 11 self.page_count_half = int((self.max_page_num - 1) / 2) # 5 """ self.num_pages=100 per_page=8 current_page =1 [0:8] current_page =2 [8:16] current_page =3 [16:24] [(current_page-1)*per_page:current_page*per_page ] """ @property def start(self): return (self.current_page - 1) * self.per_page @property def end(self): return self.current_page * self.per_page def page_html(self): # 若是總頁數小於self.max_page_num(最多顯示的頁碼個數) if self.num_pages <= self.max_page_num: page_start = 1 page_end = self.num_pages + 1 else: # 若是當前頁碼<=頁面上最多顯示11/2個頁碼時 if self.current_page <= self.page_count_half: page_start = 1 page_end = self.max_page_num + 1 # 若是當前頁碼+最多顯示11/2 大於 總頁數時 elif self.current_page + self.page_count_half > self.num_pages: page_start = self.num_pages - self.max_page_num + 1 page_end = self.num_pages + 1 else: page_start = self.current_page - self.page_count_half page_end = self.current_page + self.page_count_half + 1 page_html_list = [] # 首頁 first_page = '<nav aria-label="Page navigation"><ul class="pagination"><li><a href="?page=1">首頁</a></li>' page_html_list.append(first_page) # 上一頁 if self.current_page <= 1: prev_page = '<li class="disabled"><a href="javascript:void(0);">上一頁</a></li>' else: prev_page = '<li><a href="?page=%s">上一頁</a></li>' % (self.current_page - 1, ) page_html_list.append(prev_page) # 顯示頁碼 for i in range(page_start, page_end): if self.current_page == i: temp = '<li class="active"><a href="?page=%s">%s</a></li>' % (i, i) else: temp = '<li><a href="?page=%s">%s</a></li>' % (i, i) page_html_list.append(temp) # 下一頁 if self.current_page >= self.num_pages: next_page = '<li class="disabled"><a href="javascript:void(0);">下一頁</a></li>' else: next_page = '<li><a href="?page=%s">下一頁</a></li>' % (self.current_page + 1) page_html_list.append(next_page) # 尾頁 last_page = '<li><a href="?page=%s">尾頁</a></li></ul></nav>' % self.num_pages page_html_list.append(last_page) return "".join(page_html_list)
(2)視圖函數
from django.shortcuts import render, redirect from django.views import View # 導入view from app01 import models # 導入模型 from app01.page import Paginator # 導入自定製的分頁器 class Book(View): def get(self, request): book_list = models.Book.objects.all() current_page = request.GET.get('page') # 當前頁數 數據總數 每頁數據量 分頁量 paginator = Paginator(current_page, book_list.count(), 6, 11) book_list = book_list[paginator.start: paginator.end] return render(request, "book.html", {"book_list": book_list, "paginator": paginator, "current_page": current_page})
(3)模板函數
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <!-- 最新版本的 Bootstrap 核心 CSS 文件 --> <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> </head> <body> <h2>圖書列表</h2> <ul> {% for book in book_list %} <li>{{ book.title }} --- {{ book.price }}</li> {% endfor %} </ul> {{ paginator.page_html|safe }} </body> </html>
效果圖：django
2.終極版本分頁器
爲何須要終極版本呢，由於上面都還有些缺陷，那就是若是請求頭還有其餘數據，換頁後會消失。bootstrap
(1)終極版自定義分頁類
class Paginator: def __init__(self, request, current_page, all_count, per_page=10, max_page_num=13): """ 封裝分頁相關數據 :param current_page: 當前頁碼 :param all_count: 數據庫中的數據總條數 :param per_page: 每一個頁面顯示的數據條數 :param max_page_num: 最多顯示的頁碼個數 :param num_pages: 經過總條數/每一個頁面顯示的條數，求出總頁數 """ try: current_page = int(current_page) except Exception as e: current_page = 1 if current_page < 1: current_page = 1 self.current_page = current_page self.all_count = all_count self.per_page = per_page # 計算總頁數 num_pages, temp = divmod(all_count, per_page) if temp: num_pages += 1 self.num_pages = num_pages self.max_page_num = max_page_num # 11 self.page_count_half = int((self.max_page_num - 1) / 2) # 5 import copy self.url_args = copy.deepcopy(request.GET) print(self.url_args.urlencode()) """ self.num_pages=100 per_page=8 current_page =1 [0:8] current_page =2 [8:16] current_page =3 [16:24] [(current_page-1)*per_page:current_page*per_page ] """ @property def start(self): return (self.current_page - 1) * self.per_page @property def end(self): return self.current_page * self.per_page def page_html(self): # 若是總頁數小於self.max_page_num(最多顯示的頁碼個數) if self.num_pages <= self.max_page_num: page_start = 1 page_end = self.num_pages + 1 else: # 若是當前頁碼<=頁面上最多顯示11/2個頁碼時 if self.current_page <= self.page_count_half: page_start = 1 page_end = self.max_page_num + 1 # 若是當前頁碼+最多顯示11/2 大於 總頁數時 elif self.current_page + self.page_count_half > self.num_pages: page_start = self.num_pages - self.max_page_num + 1 page_end = self.num_pages + 1 else: page_start = self.current_page - self.page_count_half page_end = self.current_page + self.page_count_half + 1 page_html_list = [] # 首頁 self.url_args['page'] = 1 first_page = '<nav aria-label="Page navigation"><ul class="pagination"><li><a href="?%s">首頁</a></li>' % (self.url_args.urlencode()) page_html_list.append(first_page) # 上一頁 if self.current_page <= 1: prev_page = '<li class="disabled"><a href="javascript:void(0);">上一頁</a></li>' else: self.url_args['page'] = self.current_page - 1 prev_page = '<li><a href="?%s">上一頁</a></li>' % (self.url_args.urlencode(), ) page_html_list.append(prev_page) # 顯示頁碼 for i in range(page_start, page_end): self.url_args['page'] = i if self.current_page == i: temp = '<li class="active"><a href="?%s">%s</a></li>' % (self.url_args.urlencode(), i) else: temp = '<li><a href="?%s">%s</a></li>' % (self.url_args.urlencode(), i) page_html_list.append(temp) # 下一頁 if self.current_page >= self.num_pages: next_page = '<li class="disabled"><a href="javascript:void(0);">下一頁</a></li>' else: self.url_args['page'] = self.current_page + 1 next_page = '<li><a href="?%s">下一頁</a></li>' % (self.url_args.urlencode(), ) page_html_list.append(next_page) # 尾頁 self.url_args['page'] = self.num_pages last_page = '<li><a href="?%s">尾頁</a></li></ul></nav>' % self.url_args.urlencode() page_html_list.append(last_page) return "".join(page_html_list)
(2)視圖函數
from django.shortcuts import render, redirect from django.views import View # 導入view from app01 import models # 導入模型 from app01.page import Paginator # 導入自定製的分頁器 class Book(View): def get(self, request): book_list = models.Book.objects.all() current_page = request.GET.get('page') paginator = Paginator(request, current_page, book_list.count(), 6, 11) book_list = book_list[paginator.start: paginator.end] return render(request, "book.html", {"book_list": book_list, "paginator": paginator, "current_page": current_page})
(3)模板函數
模板函數同上便可app
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相關文章
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