At some point when working with Shopify you’ll probably need to output a list of tags onto the screen. When doing that, you might have situations where you want to exclude certain tags from what shows up. You can do this using the unless tag in Liquid.
First, we’ll start with outputting a simple list of tags to the screen. You could put the code below in your collection.liquid template or in a custom collection template.
<ul>
{% for tag in collection.tags %}
<li>{{ tag | link_to_tag: tag }}</li>
{% endfor %}
</ul>
This will output an ordered list of all the tags (formatted as links) in the particular collection that is being viewed. Now, let’s say this was a greeting card collection and the following tags showed up in the list generated with the code above.
- Funny
- Serious
- Photography
- Blank
- Birthday
- Holiday
- Sympathy
Now suppose you have a situation where you just want to show a list that breaks the cards down by the first four tags above: Funny, Serious, Photography, and Blank.
You could do this by excluding the other 3 tags using the unless tag in your Liquid code:
<ul>
{% for tag in collection.tags %}
{% unless tag == 'Birthday' or tag == 'Holiday' or tag == 'Sympathy' %}
<li>{{ tag | link_to_tag: tag }}</li>
{% endunless %}
{% endfor %}
</ul>
This would output the following list (formatted as links):
- Funny
- Serious
- Photography
- Blank
This is kind of a goofy example and might not give you the best idea of why you would need to do this in the real world, but hopefully this little tutorial at least demonstrates how you’d write the code if you found it necessary.