Answer: Conditional blocks in twig

in

Somebody asked a StackOverflow question about conditionally outputting blocks. I had a similar need. I came up with a solution that fit my need and responded with the answer:

The block() function appears to return a falsey value if nothing or only white space was output in it, so you can wrap the block in a truthiness test and in the child template make sure it is empty if you don't want it to show. Something like this worked for me:

base.html.twig:

{% if block('left_sidebar') %}
	<div class="col-md-2">
		{% block left_sidebar %}{% endblock %}
	</div>
	<div class="col-md-10">
{% else %}
	<div class="col-md-12">
{% endif %}

index.html.twig:

{% block left_sidebar %}
	{% if not is_granted('IS_FULLY_AUTHENTICATED') %}
		{% include ':blocks:block__login.html.twig' %}
	{% endif %}
{% endblock %}
</toby>