Jinja - Is there any built-in variable to get current HTML page name?

Question

i\'m very new to Jinja and Flask

I want to set different background color in the navigation bar to indicate the current page.

Is there any built-in Jinja var

Answer 1

There is a trick in jinja2 document for your problem: http://jinja.pocoo.org/docs/tricks/

If your list is simple enough, just using request object, something like that:

<li {% if request.endpoint == item.endpoint %} class='active' {% endif %}>
    <a href="{{url_for(endpoint)}}">{{item.text}}</a>
</li> 

Normally, I write this snippet to a macro with an explicit argument to set active:

{% macro render_sitem(endpoint, display, cls='', icon-cls='', active='') %}
<li {% if request.endpoint == endpoint or active == endpoint %} class='active' {% endif %}>
    <a class='{{cls}}' href="{{url_for(endpoint)}}"><i class="{{icon-cls}}"></i> {{display}}</a>
</li>
{% endmacro %}

The list will be something like:

 <ul class="nav nav-list">
     {{render_sitem('page.index',  _('Pages'), icon-cls='icon-sitemap', active=active_page)}}
     {{render_sitem('post.index', _('Posts'), icon-cls='icon-file', active=active_page)}}
     {{render_sitem('user.index', _('Users'), icon-cls='icon-group', active=active_page)}}
 </ul>

So if you have a child page which extends or includes your list, you can set active item like:

{% set active_page = 'page.index' %} 

in the top of your child page.

Answer 2

In pyramid 1.5 there are no method like request.endpoint in Flask.

We use custom filter get_endpoint

request.path|get_endpoint

jinja2_custom_filters.py:

from pyramid_jinja2 import Environment

def get_endpoint(str):
    """

    :param str:
    :return:
    """
    return str.split('/')[-1]


env = Environment()
env.filters['get_endpoint'] = get_endpoint

and in development.ini:

jinja2.filters =
    model_url = pyramid_jinja2.filters:model_url_filter
    route_url = pyramid_jinja2.filters:route_url_filter
    static_url = pyramid_jinja2.filters:static_url_filter
    get_endpoint = path to ... jinja2_custom_filters.get_endpoint

Maybe it will be useful to someone :)