custom pagination
view view function:
def index_page(request,page): #Pagination view
display_linkpage_count = 5 #Number of page options displayed at the bottom of the page
display_item = 10 #Display data items per page
count = Host.objects.all().count() #Total number in the database
all_page, current_page, start_item, end_item = postion(count, display_item, page)
#Call the postion function to process
result = Host.objects.all()[start_item:end_item] #Get the data to be displayed on the current page
current_count= Host.objects.all()[start_item:end_item].count() #Current page displays data items
page_html = pager(current_page, all_page,display_linkpage_count) #Call custom paging function
ret = {'data':result,'count':count,'current_count':current_count,'page_html':page_html}
return render(request,'ajax_app/index.html',ret)
routing:
url(r'^index_page/(?P<page>\d*)', views.index_page, name='index_page')
Two custom functions:
from django.utils.safestring import mark_safe #Safely output the string to the front end
def postion(count,display_item,page):
all_page = int((count + display_item - 1) / display_item) # The total number of pages, round up an integer, such as 5/2 is 3
try:
current_page = int(page)
if current_page <= 0: # If negative, defaults to 1
current_page = 1
elif current_page > all_page:
current_page = all_page
except Exception, e:
current_page = 1 # current page ID, default is 1
finally:
pass
# The data obtained by Host.objects.all() is returned as a list, starting from 0
# 0--9 Host.objects.all()[0:10] The first 10 data
# 10--19 Host.objects.all()[10:20]
# 20--29 Host.objects.all()[20:30]
start_item = (current_page - 1) * display_item
end_item = current_page * display_item
return all_page,current_page,start_item,end_item
def pager(current_page,all_page,display_linkpage_count): #Custom paging
#current_page is the current page, all_page is the total number of pages, and display_linkpage_count is the page number link to be displayed below
temp_html = []
first_html = "<a href='/ajax_app/index_page/%d'>首页</a>" % (1)
temp_html.append(first_html)
if current_page <=1:
prev_html = "<a href='#'>上一页</a>"
else:
prev_html = "<a href='/ajax_app/index_page/%d'>上一页</a>" % (current_page - 1)
temp_html.append(prev_html)
begin = current_page - (display_linkpage_count / 2)
end = current_page + (display_linkpage_count / 2)
if all_page <= display_linkpage_count: #When the total number of pages is less than the number of pages to be displayed below the link
begin = 1
end = all_page
else:
if begin == 0:
end = current_page + (current_page - begin + 1)
begin = 1
elif begin < 0:
end = current_page + (current_page - begin + 1)+1
begin = 1
elif end > all_page:
begin = current_page - (end - current_page + 1)
end = all_page
for i in range(begin,end+1):
if current_page == i:
a_html = "<a href='/ajax_app/index_page/%d' style='color: chartreuse'>%d</a>" % (i,i) #If it is the current page, display green
else:
a_html = "<a href='/ajax_app/index_page/%d'>%d</a>" % (i, i)
temp_html.append(a_html)
if current_page >= all_page:
next_html = "<a href='#'>下一页</a>"
else:
next_html = "<a href='/ajax_app/index_page/%d'>下一页</a>" % (current_page+1)
temp_html.append(next_html)
end_html = "<a href='/ajax_app/index_page/%d'>尾页</a>" % (all_page)
temp_html.append(end_html)
temp_str = mark_safe('-'.join(temp_html)) # Use the mark_safe method to statically output the string, and use the join method to concatenate the list into a string
return temp_str
html page:
<body>
<h1>Host Information</h1>
<table border="1">
<tr>
<td>hostname</td>
<td>IP address</td>
</tr>
{% for item in data %}
<tr>
<td>{{ item.hostname }}</td>
<td>{{ item.IP }}</td>
</tr>
{% endfor %}
</table>
<div>
<td>{{ page_html }}</td>
</div>
<div>Current page count: {{ current_count }}</div>
<div>Total number: {{ count }}</div>
</body>
