Aqua Tags

Tags create logic, loops, and control the template flow. They’re wrapped in {% %}.

Control Flow

if / elsif / else

Conditional rendering based on truthiness.

{% if product.available %}
  <button>Add to Cart</button>
{% elsif product.coming_soon %}
  <button disabled>Coming Soon</button>
{% else %}
  <button disabled>Sold Out</button>
{% endif %}

Operators:

Operator	Description
`==`	Equal
`!=`	Not equal
`>`	Greater than
`<`	Less than
`>=`	Greater or equal
`<=`	Less or equal
`contains`	String/array contains
`and`	Logical AND
`or`	Logical OR

{% if product.price > 100 and product.available %}
  Premium & Available
{% endif %}

{% if product.tags contains 'sale' %}
  On Sale!
{% endif %}

unless

Inverse of if - renders when condition is false.

{% unless product.available %}
  <span class="sold-out">Sold Out</span>
{% endunless %}

case / when

Switch statement for multiple conditions.

{% case product.type %}
  {% when 'Shirt' %}
    <p>Check our size guide</p>
  {% when 'Shoes' %}
    <p>Available in US sizes</p>
  {% when 'Accessory' %}
    <p>One size fits all</p>
  {% else %}
    <p>Standard sizing</p>
{% endcase %}

Iteration

for

Loop through arrays and ranges.

{% for product in collection.products %}
  <div class="product">
    {{ product.title }}
  </div>
{% endfor %}

Loop variables:

Variable	Description
`forloop.index`	Current index (1-based)
`forloop.index0`	Current index (0-based)
`forloop.first`	Is first iteration
`forloop.last`	Is last iteration
`forloop.length`	Total iterations
`forloop.rindex`	Reverse index (1-based)
`forloop.rindex0`	Reverse index (0-based)

{% for product in collection.products %}
  <div class="product {% if forloop.first %}first{% endif %}">
    {{ forloop.index }}. {{ product.title }}
  </div>
{% endfor %}

Parameters:

{# Limit results #}
{% for product in collection.products limit: 4 %}

{# Skip items #}
{% for product in collection.products offset: 2 %}

{# Reverse order #}
{% for product in collection.products reversed %}

{# Combine parameters #}
{% for product in collection.products limit: 4 offset: 2 reversed %}

Parallel iteration: For loops that fetch async data per iteration (e.g. rendering a list of product cards where each card reads metafields), append parallel: true to evaluate every iteration concurrently instead of sequentially:

{% for product in collection.products, parallel: true %}
  {% render 'product-card', product: product %}
{% endfor %}

This is an Aqua-specific extension on top of standard Liquid. Use it when the iteration body issues independent I/O — re-ordering or shared mutable state inside the loop will not behave as expected. Ranges:

{% for i in (1..5) %}
  {{ i }}
{% endfor %}

else (empty array):

{% for product in collection.products %}
  {{ product.title }}
{% else %}
  No products found.
{% endfor %}

break / continue

Control loop execution.

{% for product in collection.products %}
  {% if product.price > 1000 %}
    {% continue %}
  {% endif %}
  
  {{ product.title }}
  
  {% if forloop.index >= 10 %}
    {% break %}
  {% endif %}
{% endfor %}

cycle

Alternates between values.

{% for product in collection.products %}
  <div class="{% cycle 'odd', 'even' %}">
    {{ product.title }}
  </div>
{% endfor %}

Named cycles for nested loops:

{% cycle 'row': 'row-1', 'row-2' %}
{% cycle 'col': 'col-1', 'col-2', 'col-3' %}

tablerow

Generates HTML table rows.

<table>
  {% tablerow product in collection.products cols: 3 %}
    {{ product.title }}
  {% endtablerow %}
</table>

Parameters: cols, limit, offset

Variable

assign

Creates or updates a variable.

{% assign featured_product = all_products['product-handle'] %}
{% assign sale_price = product.price | times: 0.9 %}

capture

Captures output into a variable.

{% capture product_info %}
  <span class="title">{{ product.title }}</span>
  <span class="price">{{ product.price | money }}</span>
{% endcapture %}

{{ product_info }}

increment / decrement

Creates and modifies counter variables.

{% increment counter %}  {# 0 #}
{% increment counter %}  {# 1 #}
{% increment counter %}  {# 2 #}

{% decrement counter %}  {# -1 #}
{% decrement counter %}  {# -2 #}

Theme Tags

render

Renders a snippet with isolated scope.

{% render 'product-card', product: product %}
{% render 'icon', name: 'cart', size: 24 %}

With for loop:

{% render 'product-card' for collection.products as product %}

Variables inside render are isolated - they don’t leak to the parent template.

include

Renders a snippet with shared scope (legacy).

{% include 'snippet-name', variable: value %}

Prefer render over include. Include shares scope which can cause variable collisions.

section

Renders a section (in layouts).

{% section 'header' %}
{% section 'footer' %}

sections

Renders a section group (JSON file).

{% sections 'header-group' %}
{% sections 'footer-group' %}

layout

Specifies which layout to use.

{% layout 'theme' %}
{% layout 'alternate' %}
{% layout none %}

content_for

Dynamic block/section rendering.

{% content_for 'block', type: 'product-card', id: 'featured' %}
{% content_for 'header' %}

Template Tags

comment

Content inside is not rendered.

{% comment %}
  This won't appear in the output.
  Good for notes and temporarily hiding code.
{% endcomment %}

Single-line shorthand:

{# This is a comment #}

raw

Outputs Aqua syntax literally.

{% raw %}
  {{ this.will.not.be.parsed }}
  {% this.either %}
{% endraw %}

aqua

Multiple tags in condensed format inside a single {% liquid %} / {% aqua %} block. Both keywords are accepted as aliases of each other, but new code should use {% aqua %}.

{% aqua
  assign featured = collection.products | first
  if featured.available
    assign status = 'available'
  else
    assign status = 'sold-out'
  endif
%}

Inside the block, each line is a tag — no {% %} wrappers needed. Mix control flow (if, for, case), assignments (assign, capture), and includes (render, include, section, sections) freely.

echo

Output inside aqua blocks.

{% aqua
  assign name = 'World'
  echo 'Hello ' | append: name
%}

Form Tags

form

Creates HTML forms with CSRF protection.

{% form 'contact' %}
  {{ form.errors | default_errors }}
  
  <input type="email" name="contact[email]" required>
  <textarea name="contact[body]"></textarea>
  <button type="submit">Send</button>
{% endform %}

Form types:

Type	Purpose
`contact`	Contact form
`customer_login`	Login form
`create_customer`	Registration
`recover_customer_password`	Password reset request
`reset_customer_password`	Set new password
`activate_customer_password`	Activate account
`customer_address`	Address form
`new_comment`	Blog comment
`product`	Add to cart
`cart`	Cart update
`localization`	Country/language picker
`currency`	Currency selector
`storefront_password`	Password page

The customer form types (customer_login, create_customer, recover_customer_password, reset_customer_password, activate_customer_password, customer_address) power theme-rendered account pages. Field names, error handling, and full examples are in Theme Customer Accounts.

Product form example:

{% form 'product', product %}
  <select name="id">
    {% for variant in product.variants %}
      <option value="{{ variant.id }}">{{ variant.title }}</option>
    {% endfor %}
  </select>
  <input type="number" name="quantity" value="1" min="1">
  <button type="submit">Add to Cart</button>
{% endform %}

Form object properties:

Property	Description
`form.errors`	Validation errors
`form.posted_successfully?`	Submission success
`form.password_needed`	Password required

Pagination

paginate

Paginates arrays.

{% paginate collection.products by 12 %}
  {% for product in collection.products %}
    {{ product.title }}
  {% endfor %}
  
  {% if paginate.pages > 1 %}
    <nav class="pagination">
      {% if paginate.previous %}
        <a href="{{ paginate.previous.url }}">Previous</a>
      {% endif %}
      
      {% for part in paginate.parts %}
        {% if part.is_link %}
          <a href="{{ part.url }}">{{ part.title }}</a>
        {% else %}
          <span class="current">{{ part.title }}</span>
        {% endif %}
      {% endfor %}
      
      {% if paginate.next %}
        <a href="{{ paginate.next.url }}">Next</a>
      {% endif %}
    </nav>
  {% endif %}
{% endpaginate %}

Paginate object:

Property	Description
`paginate.current_page`	Current page number
`paginate.pages`	Total pages
`paginate.items`	Total items
`paginate.page_size`	Items per page
`paginate.current_offset`	Current offset
`paginate.previous`	Previous page object
`paginate.next`	Next page object
`paginate.parts`	Page number links

Section Schema

schema

Defines section/block configuration (JSON).

{% schema %}
{
  "name": "Featured Product",
  "settings": [
    {
      "type": "product",
      "id": "product",
      "label": "Product"
    },
    {
      "type": "checkbox",
      "id": "show_vendor",
      "label": "Show vendor",
      "default": true
    }
  ],
  "presets": [
    {
      "name": "Featured Product"
    }
  ]
}
{% endschema %}

See Schema Reference for full documentation.

stylesheet

Scoped CSS for sections.

{% stylesheet %}
  .featured-product {
    padding: 2rem;
    background: {{ section.settings.background_color }};
  }
{% endstylesheet %}

javascript

Scoped JavaScript for sections.

{% javascript %}
  document.addEventListener('DOMContentLoaded', () => {
    console.log('Section loaded');
  });
{% endjavascript %}

Whitespace Control

Add hyphens to strip whitespace:

{%- assign name = 'value' -%}
{{- output -}}

Syntax	Effect
`{%-`	Strip before
`-%}`	Strip after
`{{-`	Strip before output
`-}}`	Strip after output

Example:

{# With whitespace #}
{% assign x = 1 %}
{{ x }}

{# Without whitespace #}
{%- assign x = 1 -%}
{{- x -}}

Aqua Basics

Theme Schema

Tags

Aqua Tags

Control Flow

if / elsif / else

unless

case / when

Iteration

for

break / continue

cycle

tablerow

Variable

assign

capture

increment / decrement

Theme Tags

render

include

section

sections

layout

content_for

Template Tags

comment

raw

aqua

echo

Form Tags

form

paginate

Section Schema

schema

stylesheet

javascript

Whitespace Control

​Aqua Tags

​Control Flow

​if / elsif / else

​unless

​case / when

​Iteration

​for

​break / continue

​cycle

​tablerow

​Variable

​assign

​capture

​increment / decrement

​Theme Tags

​render

​include

​section

​sections

​layout

​content_for

​Template Tags

​comment

​raw

​aqua

​echo

​Form Tags

​form

​Pagination

​paginate

​Section Schema

​schema

​stylesheet

​javascript

​Whitespace Control

Aqua Tags

Control Flow

if / elsif / else

unless

case / when

Iteration

for

break / continue

cycle

tablerow

Variable

assign

capture

increment / decrement

Theme Tags

render

include

section

sections

layout

content_for

Template Tags

comment

raw

aqua

echo

Form Tags

form

Pagination

paginate

Section Schema

schema

stylesheet

javascript

Whitespace Control