jinja2 - 如何在 if 语句中放置一个块? [英] jinja2 - how to put a block in an if statement?

问题描述

我正在尝试使用 if 来确定哪个块应该填充我的 {% block content %}.

I am trying to use an if to determine which block should fill my {% block content %}.

我有一个 base.html，它有一个默认的 {% block content %} 并且这个模板正在扩展 base.html.所以我尝试了这个:

I have a base.html which has a default {% block content %} and this template is extending base.html. So I tried this:

{% extends "base.html" %}
{% if condition == True %}
    {% block content %}
    <div>blah blah blah blah</div>
    {% endblock content %}
{% endif %}

并且我期待看到 blah blah blah blah 如果条件为真，则看到默认块如果不为真.

and I was expecting to see blah blah blah blah if condition was true and see the default block if it wasn't true.

但两次我都得到了blah blah blah blah.

然后我尝试了这个:

{% extends "base.html" %}
{% if condition == True %}
    {% block content %}
    <div>blah blah blah blah</div>
    {% endblock content %}
{% else %}
    {% block content %}
    <div>The Default Thing</div>
    {% endblock content %}
{% endif %}

我收到了这个错误:

TemplateAssertionError: block 'content' defined twice

如何在 if 语句中放置一个块?

How can I put a block inside an if statement?

推荐答案

您不能使 {% block %} 成为条件；一旦你使用了这个标签，这个块总是会被填满.

You cannot make a {% block %} conditional; once you use the tag, the block is always going to be filled in.

把你的条件放在块中，并使用super()来指示Jinja使用模板中定义的块的原始内容:

Put your conditional inside the block instead, and use super() to instruct Jinja to use the original contents of the block as defined in the template:

{% extends "base.html" %}
{% block content %}
    {% if condition %}
        <div>blah blah blah blah</div>
    {% else %}
        {{ super() }}
    {% endif %}
{% endblock content %}

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