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问题:

I have a base.html file which has some 'random' html code and I have the following code:

{% load staticfiles %}
<!DOCTYPE html>
<html>
   <head>
      ... 
     {% block extra_js_top %}{% endblock %}
   </head>
   ...
</html>

In my index.html file I extend base.html and I load some extra javascript files:

{% extends "base.html" %}
...
{% block extra_js_top %}
   <script type="text/javascript" src="{% static "js/somejs.js" %}"></script>
{% endblock %}

The problem is that extra javascript doesn't load because of the static var. It doesn't load even if I extend base.html which have the {% load staticfiles %} inside the template. Finally I solved the problem adding one more {% load staticfiles %} at index.html.

My question is why we should add {% load staticfiles %} for every template we use even if we extend a file that has it already?

回答1:

As per Django's latest documentation, this is done for the sake of maintainability and sanity

When you load a custom tag or filter library, the tags/filters are only made available to the current template – not any parent or child templates along the template-inheritance path.

For example, if a template foo.html has {% load humanize %}, a child template (e.g., one that has {% extends "foo.html" %}) will not have access to the humanize template tags and filters. The child template is responsible for its own {% load humanize %}.

This is a feature for the sake of maintainability and sanity.

回答2:

Because that's the way template tags work. You need to load each library for every template file that uses them.

回答3:

It's logical that you'll need {% load staticfiles %} wherever you want url expansion to occur. If you have that happening in both base.html & index.html, you'll have to include it at both places (as you've already figured).