1，编写自定义过滤器并注册
创建目录
Test/app5/templatetags
分别创建文件
Test/app5/templatetags/init.py
Test/app5/templatetags/myfilter.py
添加过滤器脚本
Test/app5/templatetags/myfilter.py
from django import template
register = template.Library()
@register.filter
def show_title(value, n):
if len(value) > n:
return f'{value[:n]}...'
else:
return value
2，添加视图函数
Test/app5/views.py
from django.shortcuts import render
# Create your views here.
import datetime
def filter(request):
str1 = 'abcdefg'
str2 = 'ABCDEFGHIJKLMNO'
str3 = '123456789'
time_str = datetime.datetime.now()
return render(request, '5/filter.html', {'str1':str1, 'str2':str2, 'str3':str3, 'time_str':time_str})
def html_filter(request):
html_addr = """
<table border='2'>
<tr>
<td>
这是表格A
</td>
<td>
这是表格B
</td>
</tr>
</table>
"""
html_script = """
<script language='JavaScript'>
document.write('非法执行');
</script>
"""
return render(request, '5/html_filter.html', {"html_addr":html_addr, "html_script":html_script})
def diy_filter(request):
dict1 = {'标题': '学习Django天天加班，熬到深夜，沉迷学习无法自拔！'}
dict2 = {'标题': '学习java天天加班，熬到深夜，沉迷学习无法自拔！'}
dict3 = {'标题': '学习C++天天加班，熬到深夜，沉迷学习无法自拔！'}
lists = [dict1, dict2, dict3]
return render(request, '5/diy_filter.html', {"lists":lists})
3，添加路由
Test/app5/urls.py
from django.urls import path
from . import views
urlpatterns = [
path('filter', views.filter, name='filter'),
path('html_filter', views.html_filter, name='html_filter'),
path('diy_filter', views.diy_filter, name='diy_filter'),
]
4，添加HTML代码
Test/templates/5/diy_filter.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
{% load myfilter %} <!-- 使用半角字符 -->
<table border="1" style="width: 300px">
{% for list in lists %}
<tr>
<td>
{{ list.标题|show_title:10 }} <!-- 假设 show_title 过滤器接收一个参数 -->
</td>
</tr>
{% endfor %}
</table>
</body>
</html>
5，访问页面
http://127.0.0.1:8000/app5/diy_filter
