Le 07/02/2012 00:41, Daniel a écrit :
Hello everyone,
I was wondering if there is a way to test for the existence of content
in a block.
For example I have a layout template that is extended by all my other
templates. If those child templates don't specify content for a
specific block, how can I determine in the parent template if the
child template didn't specify anything for the content block so I can
have default content if it's not specified?
Hi,
This is not quite what you asked for, but we have a Jinja2 extension
that adds a "showonmatch" tag:
http://paste.pocoo.org/show/547689/
Usage looks like this:
{% showonmatch "ul li a" %}
<ul>
{% for item in some_list %}
<li><a href="{{ item.url }}">{{ item.name }}</a></li>
{% endfor %}
</ul>
{% else %}
<p>No items</p>
{% endshowonmatch %}
After the block (up to {% else %}) is executed, the result is parsed as
HTML by lxml, and matched against the CSS selector. (The argument to the
block.) If the selector matches anything the first part is rendered.
Otherwise, the 'else' clause (if any) is rendered. (And the first part
is thrown away, including the <ul> tags.)
This example is simple and a {% if %} would also work, but full CSS
selectors are more valuable in more complex cases.
Regards,
--
Simon Sapin
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