{{ 224 | divisibleby:2 }}  返回 True

{{ 1024 | filesizeformat }} 返回 1.0KB

{{ ‘asdikfjhihgie‘ | slice:‘:5‘ }} 返回 ‘asdik’

{{ ‘5-2=3and5 2=3‘ | slugify }} 返回 5-23and5-23

{{ ‘This is a pen‘ | truncatewords:2 }}返回

This is ...

{{ ‘<p>This is a pen</p>‘ | truncatewords:2 }}返回

<p>This is ...</p>

{{ True | yesno }}{{ False | yesno }}{{ None | yesno }} 

返回 

yes

no 

maybe

自定义过滤器：

第一步： 在app目录下创建包 templatetags

在templatetags下创建py文件，文件名随意，比如

自定义simple_tag， 不能在模板中使用if判断

from django import template
from django.utils.html import format_html
import datetime

register = template.Library()

@register.simple_tag
def page_cut(current_page, loop_page):
    #分页： 固定显示前后5页
    differ = abs(current_page - loop_page)
    if differ < 5:
        li = ‘‘‘<li class=""><a href="?page=%s">%s<span class="sr-only">(current)</span></a></li>‘‘‘ % (loop_page, loop_page)
        return format_html(li)
    else:
        #这里一定要返回一个空字符串，否则在前端会显示一系列的None
        return ‘‘

自定义过滤器函数filter

因为sample_tag不能使用if判断，所以才有了它

最多只能有两个参数，一个是变量值，一个是选项值

from django import template
from django.utils.html import format_html
import datetime

register = template.Library()

@register.filter
def time_color(exp_date):
    #给一个月内到期的html标签加上class属性
    startdate = datetime.datetime.now().date()
    enddate = startdate + datetime.timedelta(30)
    if (enddate - exp_date).days > 0 and (enddate - exp_date).days <= 30:
        td = ‘‘‘<td class="%s">%s</td>‘‘‘ % (‘exp_date‘, exp_date)
        return format_html(td)
    elif (enddate - exp_date).days > 30:
        td = ‘‘‘<td class="outof">%s</td>‘‘‘ % (exp_date)
        return format_html(td)
    else:
        td = ‘‘‘<td>%s</td>‘‘‘ % (exp_date)
        return format_html(td)

第二步，html引用

在文件开头导入

{% load my_page %}

使用

<tbody>
        {% for project in projects_list %}
        <tr>
            <td><a href="{% url ‘projects_detail‘ project.id %}">{{ project.com_name }}</a></td>
            <td>{{ project.name}}</td>
            <td>{{ project.domain }}</td>
            <td>{{ project.get_status_display }}</td>
            {{ project.exp_date|time_color }}
            <td>{{ project.ftp }}</td>
        </tr>
        {% endfor %}
    </tbody>

<!-- 页码导航 -->
<nav>
  <ul class="pagination">
    {% if projects_list.has_previous %}
        <li class=""><a href="?page={{ projects_list.previous_page_number }}" aria-label="Previous"><span aria-hidden="true">&laquo;</span></a></li>
    {% endif %}

    {% for page_num in projects_list.paginator.page_range %}
     {% if page_num == projects_list.number %}
        <li class="active"><a href="?page={{ page_num }}">{{ page_num }}<span class="sr-only">(current)</span></a></li>
     {% else %}
         #分页标签
        {% page_cut projects_list.number page_num %}
     {% endif %}
    {% endfor %}

    {% if projects_list.has_next %}
        <li class=""><a href="?page={{ projects_list.next_page_number }}" aria-label="Previous"><span aria-hidden="true">&raquo;</span></a></li>
    {% endif %}
  </ul>
</nav>