jinja2-过滤器

过滤器

过滤器是个函数，参数就是管道（pipe）前面那个变量。比如 123|myfilter，123就是myFilter的参数。如果需要两个参数，则在myFilter后面加（），即123|myFilter(234)

主要作用就是可以在模板中以管道的方式用pyhton的代码处理字符串,过滤器用 | 来使用

过滤器编写

filter函数写在app.run前，注册在app.jinja_env.filters中，比如

app = Flask(__name__)

# convert dict to string

def json_dumps(dict):

result = json.dumps(dict)

return result

# return type of arg

def typeFilter(arg):

result = type(arg)

return result

env = app.jinja_env

env.filters['json_dumps'] = json_dumps

env.filters['typeFilter'] = typeFilter

测试代码

<body>

dict is {{ dict|typeFilter}}

<hr>

dict | json_dumps is{{ dict|json_dumps |typeFilter}}

<hr>

you can use json_dumps filter to send dict to js,remember to add safe filter,<br>

press f12 to test it

</body>

//you can use json_dumps filter to send dict to js,remember to add safe filter

console.log({{ dict |json_dumps|safe}})

</script>

内置过滤器

capitalize(s)¶ 首个字母大写

Capitalize a value. The first character will be uppercase, all others lowercase.

dictsort(value, case_sensitive=False, by='key') 字典排序

Sort a dict and yield (key, value) pairs. Because python dicts are unsorted you may want to use this function to order them by either key or value:

{% for item in mydict|dictsort %}
    sort the dict by key, case insensitive

{% for item in mydict|dictsort(true) %}
    sort the dict by key, case sensitive

{% for item in mydict|dictsort(false, 'value') %}
    sort the dict by key, case insensitive, sorted
    normally and ordered by value.

escape(s) 字符转义

Convert the characters &, <, >, ‘, and ” in string s to HTML-safe sequences. Use this if you need to display text that might contain such characters in HTML. Marks return value as markup string.