蟒蛇& jinja2:执行预定义的过滤器列表

时间:2014-11-10 02:16:18

标签: python jinja2

尝试做这样的事情:

filters = ['foo', 'bar']

然后在Jinja2模板中:

<p>{{value|filter for filter in filters}}</p>

foobar是我定义的Jinja2过滤器。

这不起作用,但似乎应该很容易实现。有什么想法吗?

1 个答案:

答案 0 :(得分:0)

假设你正在使用flask(否则只是调整你的过滤器,但是你可以创建一个过滤器来应用命名过滤器。

在您的过滤器定义中(例如my_filters.py):

def filter1(x):
    return 'filtered1( {} )'.format(x)
app.jinja_env.filters['filter1'] = filter1 # Register filter

def filter2(x):
    return 'filtered2( {} )'.format(x)
app.jinja_env.filters['filter2'] = filter2

# Create a filter to apply a list of filters by name...
def apply_filters_by_name(x, filter_names):
    result = x
    # Loop through filter names and apply them sequentially
    for fname in filter_names: 
        # Get the filter function matching this name
        filter_function = app.jinja_env.filters[fname]

        # Apply the filter
        result = filter_function(result) # apply filter

    return result
app.jinja_env.filters['apply_filters_by_name'] = apply_filters_by_name

...在您的HTML模板中,例如:

{% set some_filter_names = ['filter1', 'filter2'] %}
{{ 'hello world'|apply_filters_by_name(some_filter_names) }}

在这里,我在模板中设置了some_filter_names,但显然你也可以将其作为变量传递。

结果是:

filtered2( filtered1( hello world ) )