django(模版)
阅读原文时间:2023年07月10日阅读:3

官方文档https://docs.djangoproject.com/en/1.11/ref/templates/language/

Django模板中只需要记两种特殊符号:

{{  }}和 {% %}

{{ }}表示变量,在模板渲染的时候替换成值,{% %}表示逻辑相关的操作。

变量

{{ 变量名 }}

变量名由字母数字和下划线组成。

点(.)在模板语言中有特殊的含义,用来获取对象的相应属性值。

几个例子:

view中代码:

def template_test(request):
l = [11, 22, 33]
d = {"name": "asd"}

class Person(object):  
    def \_\_init\_\_(self, name, age):  
        self.name = name  
        self.age = age

    def dream(self):  
        return "{} is dream...".format(self.name)

asd = Person(name="asd", age=34)
qwe = Person(name="qwe", age=9000)
zxc = Person(name="zxc", age=18)

person\_list = \[asd, qwe, zxc\]  
return render(request, "template\_test.html", {"l": l, "d": d, "person\_list": person\_list})

模板中支持的写法:

{# 取l中的第一个参数 #}
{{ l.0 }}
{# 取字典中key的值 #}
{{ d.name }}
{# 取对象的name属性 #}
{{ person_list.0.name }}
{# .操作只能调用不带参数的方法 #}
{{ person_list.0.dream }}

注:当模板系统遇到一个(.)时,会按照如下的顺序去查询:

  1. 在字典中查询
  2. 属性或者方法
  3. 数字索引

Filters

翻译为过滤器,用来修改变量的显示结果。

语法: {{ value|filter_name:参数 }}

'|'左右没有空格没有空格没有空格

default

{{ value|default:"nothing"}}

如果value值没传的话就显示nothing

注:TEMPLATES的OPTIONS可以增加一个选项:string_if_invalid:'找不到',可以替代default的的作用。

filesizeformat

将值格式化为一个 “人类可读的” 文件尺寸 ,以字节为单位(例如 '13 KB', '4.1 MB', '102 bytes', 等等)。例如:

{{ value|filesizeformat }}

如果 value 是 123456789,输出将会是 117.7 MB。

add

给变量加参数

{{ value|add:"2" }}

value是数字4,则输出结果为6。

{{ first|add:second }}

如果first是 [1,.2,3] ,second是 [4,5,6] ,那输出结果是 [1,2,3,4,5,6] 。

lower

小写

{{ value|lower }}

upper

大写

{{ value|upper}}

title

标题

{{ value|title }}

ljust

左对齐

"{{ value|ljust:"10" }}"

rjust

右对齐

"{{ value|rjust:"10" }}"

center

居中

"{{ value|center:"15" }}"

length

{{ value|length }}

返回value的长度,如 value=['a', 'b', 'c', 'd']的话,就显示4.

slice

切片

{{value|slice:"2:-1"}}

first

取第一个元素

{{ value|first }}

last

取最后一个元素

{{ value|last }}

join

使用字符串拼接列表。同python的str.join(list)。

{{ value|join:" // " }}

truncatechars

如果字符串字符多于指定的字符数量,那么会被截断。截断的字符串将以可翻译的省略号序列(“…”)结尾。

参数:截断的字符数

{{ value|truncatechars:9}}

date

日期格式化

 1.在函数中更改(方法一)  

date_now = datetime.datetime.now() # 默认格式Sept. 10, 2018, 4:05 p.m.
date_now=date_now.strftime('%Y-%m-%d %H:%M:%S') # 改变默认方式

2.在setting中写(方法二)

函数中这么写

import datetime
date_now = datetime.datetime.now() # 默认格式Sept. 10, 2018, 4:05 p.m.

设置中这么写

在html中这么写

{{ value|date:"Y-m-d H:i:s"}}

{{ date_now|date:"H:i:s" }} # 19:40:00 设置后还可以进行过滤,改变格式

可格式化输出的字符:点击查看https://docs.djangoproject.com/en/1.11/ref/templates/builtins/#date

safe

Django的模板中会对HTML标签和JS等语法标签进行自动转义,原因显而易见,这样是为了安全。但是有的时候我们可能不希望这些HTML元素被转义,比如我们做一个内容管理系统,后台添加的文章中是经过修饰的,这些修饰可能是通过一个类似于FCKeditor编辑加注了HTML修饰符的文本,如果自动转义的话显示的就是保护HTML标签的源文件。为了在Django中关闭HTML的自动转义有两种方式,如果是一个单独的变量我们可以通过过滤器“|safe”的方式告诉Django这段代码是安全的不必转义。

比如:

view:

value = "点我"

'js'= """"""

html:

{{ value|safe}}
{{js|safe}}

自定义filter

自定义过滤器只是带有一个或两个参数的Python函数:

  • 变量(输入)的值 - -不一定是一个字符串
  • 参数的值 - 这可以有一个默认值,或完全省略

例如,在过滤器{{var | foo:“bar”}}中,过滤器foo将传递变量var和参数“bar”

自定义filter代码文件摆放位置:

app01/
__init__.py
models.py
templatetags/ # 在app01下面新建一个 templatetags(包),这个名字不能变
__init__.py
myfilters.py # 建一个存放自定义filter的py文件
views.py

编写自定义filter

from django import template
register=template.Library()

@register.filter
def add_sb(value,arg='very'): #arg='very'默认参数
return "{}_{}_sb".format(value,arg)

@register.filter(name='dsb') #dsb等同于add_dsb
def add_dsb(value,arg="**"):
return "{}_{}_dsb".format(value,arg)

使用自定义filter

{# 先导入我们自定义filter那个文件 #}
{% load myfilters %}
{# 使用我们自定义的filter #}
{{ name_list.1|add_sb:"非常" }}
{{ name_list.0|add_sb}}
{{ name_list.3|dsb}}

Tags

for

    {% for user in user\_list %}
  • {{ user.name }}
  • {% endfor %}

for循环可用的一些参数:

Variable

Description

forloop.counter

当前循环的索引值(从1开始)

forloop.counter0

当前循环的索引值(从0开始)

forloop.revcounter

当前循环的倒序索引值(从1开始)

forloop.revcounter0

当前循环的倒序索引值(从0开始)

forloop.first

当前循环是不是第一次循环(布尔值)

forloop.last

当前循环是不是最后一次循环(布尔值)

forloop.parentloop

本层循环的外层循环

forloop的本质是字典

在forloop中自由选择自己想要的元素

if语句不支持加减乘除,这里可以使用过滤器去代替运算(forloop.counter|divisibleby:2,如果参数是1,则选中的是每一个元素)

{% for hobby\_list in hobby\_list2 %} {% for hobby in hobby\_list %} {% if forloop.counter|divisibleby:2 and forloop.parentloop.counter == 2%} {% else %} {% endif %} {% endfor %} {% endfor %}
{{ hobby }}{{ hobby }}

for … empty

    {% for user in user\_list %}
  • {{ user.name }}
  • {% empty %}
  • 空空如也
  • {% endfor %}

if,elif和else

{% if user_list %}
用户人数:{{ user_list|length }}
{% elif black_list %}
黑名单数:{{ black_list|length }}
{% else %}
没有用户
{% endif %}

当然也可以只有if和else

{% if user_list|length > 5 %}
七座豪华SUV
{% else %}
黄包车
{% endif %}

if语句支持 and 、or、==、>、<、!=、<=、>=、in、not in、is、is not判断。

with

定义一个中间变量

{% with total=business.employees.count %}
{{ total }} employee{{ total|pluralize }}
{% endwith %}

csrf_token

这个标签用于跨站请求伪造保护。

在页面的form表单里面写上{% csrf_token %}

注释

{# … #}

注意事项

1. Django的模板语言不支持连续判断,即不支持以下写法:

django不支持连续判断

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" 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python的比较方法

  js的比较方法

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alt="" width="300" height="208" />

2. Django的模板语言中属性的优先级大于方法

def xx(request):
d = {"a": 1, "b": 2, "c": 3, "items": "100"}
return render(request, "xx.html", {"data": d})

如上,我们在使用render方法渲染一个页面的时候,传的字典d有一个key是items并且还有默认的 d.items() 方法,此时在模板语言中:

{{ data.items }}

默认会取d的items key的值。







Title
{% block page-css %}

{% endblock %}

这是母板的标题

{% block page-main %}

{% endblock %}

母板底部内容


{% block page-js %}

{% endblock %}

注意:我们通常会在母板中定义页面专用的CSS块和JS块,方便子页面替换。

在子页面中在页面最上方使用下面的语法来继承母板。

{% extends 'main-model.html' %}

通过在母板中使用{% block&nbsp; xxx %}来定义"块"。

在子页面中通过定义母板中的block名来对应替换母板中相应的内容。

{% block page-main %}

世情薄

人情恶

雨送黄昏花易落


{% endblock %}

可以将常用的页面内容如导航条,页尾信息等组件保存在单独的文件中,然后在需要使用的地方按如下语法导入即可。

{% include 'navbar.html' %}

{% load static %}
Hi!

引用JS文件时使用:

{% load static %}

某个文件多处被用到可以存为一个变量

{% load static %}
{% static "images/hi.jpg" as myphoto %}

使用get_static_prefix

{% load static %}
Hi!

或者

{% load static %}
{% get_static_prefix as STATIC_PREFIX %}

Hi!
Hello!

实例:link链接

 settings中的static名字改变后,两种在文件中直接修改,不影响运行的方法

自定义simpletag

和自定义filter类似,只不过接收更灵活的参数。

定义注册simple tag

@register.simple_tag(name="plus")
def plus(a, b, c):
return "{} + {} + {}".format(a, b, c)

使用自定义simple tag

{% load app01_demo %}

{# simple tag #}
{% plus "1" "2" "abc" %}

实例

写函数

from django import template

register = template.Library()

@register.simple_tag
def plus(arg, arg1, arg2,*args,**kwargs):
print(args)
print(kwargs)
return '{}_{}_{}'.format(arg, arg1, arg2)+'_'.join(args)

在html上渲染页面

{% load mytags %}
{% plus 'heshang' 'very' 'gay' 'dubiao' 'ye' 'very' 'gay'%}
{% plus 'heshang' 'very' 'gay' key='' key2='' %}

inclusion_tag

多用于返回html代码片段

示例:1

templatetags/my_inclusion.py

from django import template

register = template.Library()

@register.inclusion_tag('result.html')
def show_results(n):
n = 1 if n < 1 else int(n)
data = ["第{}项".format(i) for i in range(1, n+1)]
return {"data": data}

templates/snippets/result.html

    {% for choice in data %}
  • {{ choice }}
  • {% endfor %}

templates/index.html



inclusion_tag test

{% load inclusion_tag_test %}

{% show_results 10 %}

示例2:编写分页

在app01下创建一个teplatetags包,在templatepags下创建一个py文件,如:mytags,在py文件中写如下代码:

from django import template
register=template.Library()

@register.inclusion_tag('paginations.html')
def pagination(total,page_num): #接受到参数后,经过整理,将参数返回给paginations.html
return {'num':range(1,total+1),'page_num':page_num}

在templates下创建一个html文件,如:paginations,在html中写如下代码

在要渲染的页面(如:asd.html)中的适当位置写如下代码

    {% load mytags %}   #引入mytags文件  
    {% pagination 6  2%}  #填写参数6,2,将参数传给pagination

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