Neon One Help Center home page
Neon One Help Center home page
support

Articles in this section

Control Flow Tags

Last updated

Control flow tags create conditions that decide whether blocks of Liquid code get executed.

Control flow tags:

  • if
  • unless
  • else / elsif
  • case / when

if

Executes a block of code only if a certain condition is true.

Input

{% if Campaign.Name == "Awesome Campaign" %}
    This campaign is awesome!
{% endif %}

Output

This campaign is awesome!

unless

The opposite of if: executes a block of code only if a certain condition is not met.

Input

{% unless Campaign.Name == "Awesome Campaign" %}
    This campaign is not awesome.
{% endunless %}

Output

This campaign is not awesome.

This would be the equivalent of doing the following:

Input

{% if Campaign.Name != "Awesome Campaign" %}
    This campaign is not awesome.
{% endif %}

else/elsif

Adds more conditions within an if or unless block.

Input

{% if User.Name == "John" %}
    Hey John!
{% elsif User.Name == "Stacy" %}
    Hey Stacy!
{% else %}
    Hey stranger!
{% endif %}

If the user's name is Stacy, the output will be:

Output

Hey Stacy!

case/when

Creates a switch statement to compare a variable with different values. case initializes the switch statement, and when compares its values.

Input

{% assign handle = "cake" %}
{% case handle %}
    {% when "cake" %}
                  This is a cake
    {% when "cookie" %}
                  This is a cookie
    {% else %}
                  This is not a cake nor a cookie
{% endcase %}

If the user's name is Stacy, the output will be:

Output

This is a cake