Custom filters and labels are written in the python file (.py), so first create a new folder name, and then create a new folder under this folder, the name is generally written template tags, write this name, in order to facilitate the connection with the system, and finally create a new Python file under template tags, take a name This is common_extra.py, and then register the new outermost folder name into the APPS in settings.py
Filters and labels are usually written in templates, so prepare a template and some data first. Create a new template and name it test2.html
views.py in
context(context)The data in the test2.html Stencil
def func(request):
return render(request,'test/test2.html', context={
'name':'liping',
'age':20,
'list':[1,3,11,20,30,33,0,0.9],
'time_format':'%Y %m %d %H:%M:%S',
'showList':['android', 'ios', 'java', 'ai', 'python'],
})
test2.html in
Import custom file names on top
{% load common_extra %}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
< title > custom tags and filters </title >
</head>
<body>
Custom Sorting Filter
{{ list|my_sort }} <br>
Customized Uppercase Filter
{{ name|myUpper }} <br>
Custom Replacement String Character Filter
{{ name|myReplace:'i' }} <br>
<br>
Custom access to current time label
{% current_time %}
<br>
Customize Getting Current Time Label Passing Parameters
{% current_time2 '%Y %m %d %H:%M:%S' %}
<br>
A custom simple addition filter
{% add 10 100 %}
<br>
A custom filter to get the current time, using context data
{% current_time3 %}
<br>
Customizing Inclusion Labels Using showTest.html Template
{% showHtml %}
<br>
Customize inclusion tags using showTest.html template transfer parameters
{% showHtml2 'android' %}
<br>
Customize inclusion tags using showTest.html template using context data
{% showHtml3 %}
</body>
</html>
common_extra.py file
Import template package
from django import template
//Getting Library Objects
register = template.Library()
# Custom filter
//Custom Sorting
@register.filter
def my_sort(value):
a = sorted(value)
return a
//Custom capitalization
@register.filter('myUpper')
def myUp(value):
return value.upper() + ' custom'
//Custom substitution characters
@register.filter
def myReplace(value, arg):
return value.replace(arg, 'k')
# Customize Simple Labels
//Import time packet
import datetime
//Customize Simple Tags without Parameters
@register.simple_tag
def current_time():
format_string = "%Y year %m month %d day %H:%M:%S"
return datetime.datetime.now().strftime(format_string)
//With parameters
@register.simple_tag
def current_time2(timeFormat):
return datetime.datetime.now().strftime(timeFormat)
@register.simple_tag
def add(a, b):
c = a + b
return c
//Using contextual data
@register.simple_tag(takes_context=True)#Allow use of context
def current_time3(context):#This parameter name must be context
format = context.get('time_format')
return datetime.datetime.now().strftime(format)
# Custom Inclusion Label
//Including tags is one thing to be displayed in one module and rendered in another module.
# No parameters
@register.inclusion_tag('test/showTest.html')
def showHtml():
arr = ['java', 'ios', 'python', 'web', 'php', 'c']
return {'array':arr}
#Including parameters
@register.inclusion_tag('test/showTest.html')
def showHtml2(arr):
return {'array':arr}
# Use contextual data
@register.inclusion_tag('test/showTest.html', takes_context=True)
def showHtml3(context):
list = context.get('showList')
return {'array':list}
showTest.html in
{% for i in array %}
<button>{{ i }}</button><br>
{% endfor %}