Django Template overriding

Question

I was wondering, when using templates in django, I'm able to extend other base templates and override some of the blocks in the base template. so my question is when I override, would the code in the overridden block still get rendered then overridden, or would it never be run and only the new block is rendered?

Example:

base.html

{% block menu %}
    {% for option in menu %}

       ...Create the menu entries

    {% endfor %}
{% endblock menu %}

extender.html

{% extends base.html %}

{% block menu %}
    ... some other tags
{% endblock menu %}

In this case does the original for loop in the base.html run if it gets overridden?

Nico Griffioen · Accepted Answer · 2019-10-22 09:28:56Z

2

As far as I know the block will be overwritten unless you want to preserve its code in your extended template.

If you want to preserve the original block you can use {{ block.super }}

base.html

[...]
<body>
    {% block header %}
        base header content
    {% endblock %}
    [...]
</body>

extended.html

{% extends "base.html" %}
{% block header %}
    {{ block.super }}
    new content added
{% endblock %}
[...]

G.

edited Oct 22, 2019 at 9:28

Nico Griffioen

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answered Oct 22, 2019 at 8:42

Gabriel

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3 Comments

Zakaria Talhami Over a year ago

Nice! block.super is new to me, so to understand from your answer, if the base.html had a time consuming code in the block, it wont run because it is overridden?

Gabriel Over a year ago

Yes, that's what will happen! the engine ignores (get rid of) the code in your base template, so, if you do something like {% block header %}{% endblock %} it will render (and process) an empty string avoiding any loop or overload in the base template

Zakaria Talhami Over a year ago

Thanks @gariel, this is what im looking for.

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