直接上代碼吧:
基礎版
import math
class Page:
def __init__(self, total_num, page_num, every_page_num=10, show_page_num=9):
"""
:param total_num: 資料庫擷取到的資料的總數
:param page_num: 前端擷取的頁數
:param every_page_num: 自定義每頁顯示條數
:param show_page_num: 顯示分頁數目
"""
self.total_num = total_num
self.page_num = page_num
self.every_page_num = every_page_num
self.show_page_num = show_page_num
self.page_tags_html = ''
self.page_start_num = 0
self.page_end_num = 0
self.start_page_num = 1
self.end_page_num = 1
try:
self.page_num = int(self.page_num)
except:
self.page_num = 1
# 通過向上取整計算出資料的總頁數
self.total_page_num = math.ceil(self.total_num / self.every_page_num)
if self.total_page_num:
# 判斷從前端得到的頁碼數是否小于1,小于1就重置為1
if self.page_num < 1:
self.page_num = 1
# 判斷從前端得到的頁碼數是否大于總頁碼數,大于就重置為最大頁碼數
elif self.page_num > self.total_page_num:
self.page_num = self.total_page_num
# 目前頁的開始資料
self.page_start_num = (self.page_num - 1) * self.every_page_num
# 目前頁的結束資料
self.page_end_num = (self.page_num) * self.every_page_num
# 判斷總頁碼數和要展示的頁數,如果總頁碼數大于要展示的頁碼數就展示對應的頁數否則有多少頁就展示多少頁
if self.total_page_num > self.show_page_num:
self.start_page_num = self.page_num - (self.show_page_num // 2)
self.end_page_num = self.page_num + (self.show_page_num // 2)
if self.start_page_num < 1:
self.start_page_num = 1
self.end_page_num = self.show_page_num
if self.end_page_num > self.total_page_num:
self.end_page_num = self.total_page_num
self.start_page_num = (self.total_page_num - self.show_page_num)
else:
self.start_page_num = 1
self.end_page_num = self.total_page_num
@property
def start(self):
return self.page_start_num
@property
def end(self):
return self.page_end_num
@property
def html(self):
pre_page_num = self.page_num - 1 if self.page_num > 1 else self.page_num
next_page_num = self.page_num + 1 if self.page_num < self.total_page_num else self.total_page_num
The_first_page = '<li><a href="?page=1">首頁</a>' \
f'</li><li><a href="?page={pre_page_num}">«</a></li>'
The_last_page = f'<li><a href="?page={next_page_num}">»</a></li>' \
f'<li><a href="?page={self.total_page_num}">尾頁</a></li></ul></nav>'
self.page_tags_html = f'<nav aria-label="Page navigation"> <ul class="pagination">{The_first_page}'
for i in range(self.start_page_num, self.end_page_num + 1):
if i == self.page_num:
self.page_tags_html += f'<li class="active"><a href="?page={i}">{i}</a></li>'
else:
self.page_tags_html += f'<li><a href="?page={i}">{i}</a></li>'
self.page_tags_html += The_last_page
return self.page_tags_html
進階版(增加了url參數的保留功能)
import math
import copy
class Page:
def __init__(self, total_num, page_num, request, every_page_num=10, show_page_num=9):
"""
:param total_num: 資料庫擷取到的資料的總數
:param request: 目前url請求資料,用于擷取url參數
:param page_num: 前端擷取的頁數
:param every_page_num: 自定義每頁顯示條數
:param show_page_num: 顯示分頁數目
"""
self.total_num = total_num
self.page_num = page_num
self.every_page_num = every_page_num
self.show_page_num = show_page_num
self.page_tags_html = ''
self.page_start_num = 0
self.page_end_num = 0
self.start_page_num = 1
self.end_page_num = 1
try:
self.page_num = int(self.page_num)
except:
self.page_num = 1
# 擷取目前url請求中的參數
params = copy.deepcopy(request.GET)
self.params = params
# 通過向上取整計算出資料的總頁數
self.total_page_num = math.ceil(self.total_num / self.every_page_num)
if self.total_page_num:
# 判斷從前端得到的頁碼數是否小于1,小于1就重置為1
if self.page_num < 1:
self.page_num = 1
# 判斷從前端得到的頁碼數是否大于總頁碼數,大于就重置為最大頁碼數
elif self.page_num > self.total_page_num:
self.page_num = self.total_page_num
# 目前頁的開始資料
self.page_start_num = (self.page_num - 1) * self.every_page_num
# 目前頁的結束資料
self.page_end_num = (self.page_num) * self.every_page_num
# 判斷總頁碼數和要展示的頁數,如果總頁碼數大于要展示的頁碼數就展示對應的頁數否則有多少頁就展示多少頁
if self.total_page_num > self.show_page_num:
self.start_page_num = self.page_num - (self.show_page_num // 2)
self.end_page_num = self.page_num + (self.show_page_num // 2)
if self.start_page_num < 1:
self.start_page_num = 1
self.end_page_num = self.show_page_num
if self.end_page_num > self.total_page_num:
self.end_page_num = self.total_page_num
self.start_page_num = (self.total_page_num - self.show_page_num)
else:
self.start_page_num = 1
self.end_page_num = self.total_page_num
@property
def start(self):
return self.page_start_num
@property
def end(self):
return self.page_end_num
@property
def html(self):
pre_page_num = self.page_num - 1 if self.page_num > 1 else self.page_num
next_page_num = self.page_num + 1 if self.page_num < self.total_page_num else self.total_page_num
self.params["page"] = 1
The_home_page_html = f'<li><a href="?{self.params.urlencode()}">首頁</a></li>'
self.params["page"] = pre_page_num
pre_page_num_html = f'<li><a href="?{self.params.urlencode()}">«</a></li>'
The_first_page_html = The_home_page_html + pre_page_num_html
self.params["page"] = next_page_num
next_page_num_html = f'<li><a href="?{self.params.urlencode()}">»</a></li>'
self.params["page"] = self.total_page_num
The_end_page_html = f'<li><a href="?{self.params.urlencode()}">尾頁</a></li></ul></nav>'
The_last_page_html = next_page_num_html + The_end_page_html
self.page_tags_html = f'<nav aria-label="Page navigation"> <ul class="pagination">{The_first_page_html}'
for i in range(self.start_page_num, self.end_page_num + 1):
self.params["page"] = i
if i == self.page_num:
self.page_tags_html += f'<li class="active"><a href="?{self.params.urlencode()}">{i}</a></li>'
else:
self.page_tags_html += f'<li><a href="?{self.params.urlencode()}">{i}</a></li>'
self.page_tags_html += The_last_page_html
return self.page_tags_html
分頁的使用:
class Home(views.View):
def get(self, request):
article_list = models.Article.objects.all()
totol_num = article_list.count()
page_num = request.GET.get("page", 1)
# 分頁執行個體化傳參
page_obj = Page(total_num=totol_num, page_num=page_num, every_page_num=9)
# 根據分頁拿到的start和end切片得到所要的資料
data = article_list[page_obj.start:page_obj.end]
# 調用html方法得到分頁的html代碼片段
page_html = page_obj.html
return render(request, 'home.html', {'article_list': data, 'page_html': page_html})
ps:在python腳本中調用django環境實作資料庫批量添加資料操作
import os
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "fenye.settings")
if __name__ == "__main__":
import django
django.setup()
from app01 import models
def create():
obj_list = [models.Book(name = f"pyhton{i}") for i in range(160)]
models.Book.objects.bulk_create(obj_list)
create()
#
# def delete():
# models.Book.objects.all().delete()
# delete()