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 variable or method that returns current HTML pages? If possible, I want the code that doesn't need to communicate with the Python file.

So if i'm currently in index.html, it will return "index" or "index.html"

Here's my navigation code in my template:

<ul>    {% for item in navigation %}        <a href="{{url_for(item.route)}}">        <li>            {{item.text}}        </li>        </a>    {% endfor %} </ul> 

I want to add if statement so the current page will get <li> that has class

{% if ??? %}    <li class="current">    ...    </li> {% else %}    ... {% endif %} 

Thank You

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 :)