Python之路65-Django分頁、自定義分頁
阿新 • • 發佈：2017-05-25
python
目錄
一、XSS
二、分頁1
三、分頁2
四、分頁3
一、XSS
有下面一段代碼，想將這段代碼中的字符串渲染到HTML頁面中，默認Django是不能這樣去操作的
views.py
def user_list(request):
page_str = """
<a href="/user_list/?p=1">1</a>
<a href="/user_list/?p=2">2</a>
<a href="/user_list/?p=3">3</a>
"""
return render(request, "user_list.html", {"page_str": page_str})user_list.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<ul>
{% for item in li %}
{% include "li.html" %}
{% endfor %}
</ul>
<div>
{{ page_str }}
</div>
</body>
</html>li.html
<li>{{ item }}</li>渲染後的頁面只能以字符串的形式顯示我們傳入的HTML代碼
Django認為這存在危險，可能會存在代碼被註入的可能，我們可以通過下面兩種方式解決
1.模板的方式
{{ page_str|safe }}2.視圖方式
from django.utils.safestring import mark_safe
def user_list(request):
page_str = """
<a href="/user_list/?p=1">1</a>
<a href="/user_list/?p=2">2</a>
<a href="/user_list/?p=3">3</a>
"""
page_str = mark_safe(page_str)
return render(request, "user_list.html", {"page_str": page_str})二、分頁1
urls.py
from django.conf.urls import url
from django.contrib import admin
from django.conf.urls import include
from app01 import views
urlpatterns = [
url(r‘^admin/‘, admin.site.urls),
url(r‘^user_list/‘, views.user_list),
]views.py
from django.shortcuts import render
from django.shortcuts import HttpResponse
# Create your views here.
from django.urls import reverse
from django.utils.safestring import mark_safe
LIST = []
for i in range(109):
LIST.append(i)
def user_list(request):
current_page = request.GET.get("p", 1)
current_page = int(current_page)
start = (current_page - 1) * 10
end = current_page * 10
data = LIST[start:end]
# 總個數
all_count = len(LIST)
# 取商、余數
count, y = divmod(all_count, 10)
if y:
count += 1
page_list = []
for i in range(1, count+1):
if i == current_page:
temp = ‘<a class="page active" href="/user_list/?p=%s">%s</a>‘ % (i, i)
else:
temp = ‘<a class="page" href="/user_list/?p=%s">%s</a>‘ % (i, i)
page_list.append(temp)
page_str = "".join(page_list)
page_str = mark_safe(page_str)
return render(request, "user_list.html", {"li": data, "page_str": page_str})user_list.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.pagination .page{
display: inline-block;
padding: 5px;
background-color: cyan;
margin: 5px;
}
.pagination .page.active{
background-color: brown;
color: black;
}
</style>
</head>
<body>
<ul>
{% for item in li %}
{% include "li.html" %}
{% endfor %}
</ul>
<div class="pagination">
{{ page_str }}
</div>
</body>
</html>三、分頁2
views.py
from django.shortcuts import render
from django.shortcuts import HttpResponse
# Create your views here.
from django.urls import reverse
from django.utils.safestring import mark_safe
LIST = []
for i in range(1009):
LIST.append(i)
def user_list(request):
current_page = request.GET.get("p", 1)
# 當前頁數
current_page = int(current_page)
per_page_count = 10
start = (current_page - 1) * per_page_count
end = current_page * per_page_count
data = LIST[start:end]
# 總個數
all_count = len(LIST)
# 取商、余數
total_count, y = divmod(all_count, per_page_count)
if y:
total_count += 1
page_list = []
pager_num = 11
if total_count < pager_num:
start_index = 1
end_index = total_count + 1
else:
if current_page <= (pager_num+1)/2:
start_index = 1
end_index = pager_num + 1
else:
start_index = current_page - (pager_num-1)/2
end_index = current_page + (pager_num+1)/2
if (current_page + (pager_num-1)/2) > total_count:
end_index = total_count + 1
start_index = total_count - pager_num + 1
if current_page == 1:
prev = ‘<a class="page" href="#">上一頁</a>‘
else:
prev = ‘<a class="page" href="/user_list/?p=%s">上一頁</a>‘ % (current_page - 1)
page_list.append(prev)
for i in range(int(start_index), int(end_index)):
if i == current_page:
temp = ‘<a class="page active" href="/user_list/?p=%s">%s</a>‘ % (i, i)
else:
temp = ‘<a class="page" href="/user_list/?p=%s">%s</a>‘ % (i, i)
page_list.append(temp)
if current_page == total_count:
nex = ‘<a class="page" href="#">下一頁</a>‘
else:
nex = ‘<a class="page" href="/user_list/?p=%s">下一頁</a>‘ % (current_page + 1)
page_list.append(nex)
jump = """
<input type=‘text‘ /><a id=‘ii1‘ onclick=‘jumpTo(this, "/user_list/?p=");‘>GO</a>
<script>
function jumpTo(ths, base){
var val = ths.previousSibling.value;
location.href = base + val;
}
</script>
"""
page_list.append(jump)
page_str = "".join(page_list)
page_str = mark_safe(page_str)
return render(request, "user_list.html", {"li": data, "page_str": page_str})user_list.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.pagination .page{
display: inline-block;
padding: 5px;
background-color: cyan;
margin: 5px;
}
.pagination .page.active{
background-color: brown;
color: black;
}
</style>
</head>
<body>
<ul>
{% for item in li %}
{% include "li.html" %}
{% endfor %}
</ul>
<div class="pagination">
{{ page_str }}
</div>
</body>
</html>四、分頁3
urls.py
from django.conf.urls import url
from django.contrib import admin
from django.conf.urls import include
from app01 import views
urlpatterns = [
url(r‘^admin/‘, admin.site.urls),
url(r‘^user_list/‘, views.user_list),
]views.py
from django.shortcuts import render
from django.shortcuts import HttpResponse
# Create your views here.
from django.urls import reverse
from utils import pagination
LIST = []
for i in range(1009):
LIST.append(i)
def user_list(request):
current_page = request.GET.get("p", 1)
current_page = int(current_page)
page_obj = pagination.Page(current_page, len(LIST))
data = LIST[page_obj.start:page_obj.end]
page_str = page_obj.page_str("/user_list/")
return render(request, "user_list.html", {"li": data, "page_str": page_str})在工程目錄創建目錄utils，然後在此目錄中創建pagination.py文件
pagination.py
#!/usr/bin/env python
# _*_ coding:utf-8 _*_
# Author: JiaChen
from django.utils.safestring import mark_safe
# 封裝分頁模塊
class Page(object):
def __init__(self, current_page, data_count, per_page_count=10, pager_num=7):
self.current_page = current_page
self.data_count = data_count
self.per_page_count = per_page_count
self.pager_num = pager_num
@property
def start(self):
return (self.current_page - 1) * self.per_page_count
@property
def end(self):
return self.current_page * self.per_page_count
@property
def total_count(self):
v, y = divmod(self.data_count, self.per_page_count)
if y:
v += 1
return v
def page_str(self, base_url):
page_list = []
if self.total_count < self.pager_num:
start_index = 1
end_index = self.total_count + 1
else:
if self.current_page <= (self.pager_num + 1) / 2:
start_index = 1
end_index = self.pager_num + 1
else:
start_index = self.current_page - (self.pager_num - 1) / 2
end_index = self.current_page + (self.pager_num + 1) / 2
if (self.current_page + (self.pager_num - 1) / 2) > self.total_count:
end_index = self.total_count + 1
start_index = self.total_count - self.pager_num + 1
if self.current_page == 1:
prev = ‘<a class="page" href="#">上一頁</a>‘
else:
prev = ‘<a class="page" href="%s?p=%s">上一頁</a>‘ % (base_url, self.current_page - 1)
page_list.append(prev)
for i in range(int(start_index), int(end_index)):
if i == self.current_page:
temp = ‘<a class="page active" href="%s?p=%s">%s</a>‘ % (base_url, i, i)
else:
temp = ‘<a class="page" href="%s?p=%s">%s</a>‘ % (base_url, i, i)
page_list.append(temp)
if self.current_page == self.total_count:
nex = ‘<a class="page" href="#">下一頁</a>‘
else:
nex = ‘<a class="page" href="%s?p=%s">下一頁</a>‘ % (base_url, self.current_page + 1)
page_list.append(nex)
jump = """
<input type=‘text‘ /><a id=‘ii1‘ onclick=‘jumpTo(this, "%s?p=");‘>GO</a>
<script>
function jumpTo(ths, base){
var val = ths.previousSibling.value;
location.href = base + val;
}
</script>
""" % base_url
page_list.append(jump)
page_str = "".join(page_list)
page_str = mark_safe(page_str)
return page_struser_list.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.pagination .page{
display: inline-block;
padding: 5px;
background-color: cyan;
margin: 5px;
}
.pagination .page.active{
background-color: brown;
color: black;
}
</style>
</head>
<body>
<ul>
{% for item in li %}
{% include "li.html" %}
{% endfor %}
</ul>
<div class="pagination">
{{ page_str }}
</div>
</body>
</html>本文出自 “八英裏” 博客，請務必保留此出處http://5921271.blog.51cto.com/5911271/1929399
Python之路65-Django分頁、自定義分頁