django(模版)

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

常用语法

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 = "<a href='http://www/baidu.com'>点我</a>"

'js'= """<script>
   for(var i=0;i<5;i++){
      alert('123')
       }
  </script>"""

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  

<ul>
{% for user in user_list %}
    <li>{{ user.name }}</li>
{% endfor %}
</ul>

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）

<table border="1">
    <thead>
    {% for hobby_list in hobby_list2 %}
        <tr>
            {% for hobby in hobby_list %}
                {% if forloop.counter|divisibleby:2 and forloop.parentloop.counter == 2%}

                     <th style="color:red;">{{ hobby }}</th>
                    {% else %}
                    <th>{{ hobby }}</th>
                {% endif %}

            {% endfor %}
        </tr>
    {% endfor %}

    </thead>
</table>

for ... empty

<ul>
{% for user in user_list %}
    <li>{{ user.name }}</li>
{% empty %}
    <li>空空如也</li>
{% endfor %}
</ul>

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。

母板

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="x-ua-compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Title</title>
  {% block page-css %}

  {% endblock %}
</head>
<body>

<h1>这是母板的标题</h1>

{% block page-main %}

{% endblock %}
<h1>母板底部内容</h1>
{% block page-js %}

{% endblock %}
</body>
</html>

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。

继承母板

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' %}

块（block）

通过在母板中使用{% block  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 %}
  <p>世情薄</p>
  <p>人情恶</p>
  <p>雨送黄昏花易落</p>
{% endblock %}

组件（也要写在block中）

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' %}

静态文件相关{% load static %}

{% load static %}
<img src="{% static "images/hi.jpg" %}" alt="Hi!" />

引用JS文件时使用：

{% load static %}
<script src="{% static "mytest.js" %}"></script>

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 %}
<img src="{{ myphoto }}"></img>

使用get_static_prefix

{% load static %}
<img src="{% get_static_prefix %}images/hi.jpg" alt="Hi!" />

或者

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

<img src="{{ STATIC_PREFIX }}images/hi.jpg" alt="Hi!" />
<img src="{{ STATIC_PREFIX }}images/hi2.jpg" alt="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

<ul>
  {% for choice in data %}
    <li>{{ choice }}</li>
  {% endfor %}
</ul>

templates/index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="x-ua-compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>inclusion_tag test</title>
</head>
<body>

{% load inclusion_tag_test %}

{% show_results 10 %}
</body>
</html>

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

<div class="pull-right">
                <nav aria-label="Page navigation">
                    <ul class="pagination">
                        <li class="disabled">
                            <a href="#" aria-label="Previous">
                                <span aria-hidden="true">&laquo;</span>
                            </a>
                        </li>
　　　　　　　　{#收到函数返回的参数后，将数据进行处理，变成动态的分页页面，并将页面渲染到asd页面中#}
                        {% for foo in num %}
                            {% if foo == page_num %}
                                <li class="active"><a href="">{{ foo }}</a></li>
                            {% else %}
                                <li><a href="">{{ foo }}</a></li>
                            {% endif %}
                        {% endfor %}

                        <li>
                            <a href="#" aria-label="Next">
                                <span aria-hidden="true">&raquo;</span>
                            </a>
                        </li>
                    </ul>
                </nav>
            </div>

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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