Clerk.js's template language is a subset of the Liquid template language.
Here is a simple example of a template:
<h1>{{ headline }}</h1>
<ul class="product-list">
{% for product in products %}
<li class="product">
<h2 class="product-name">{{ product.name }}</h2>
<img src="{{ product.image }}" title="{{ product.name }}" />
{% if product.price < product.list_price %}
<div class="list-price">${{ product.list_price | money }}</div>
<div class="price">${{ product.price | money }}</div>
<div class="discount">You Save: {{ product.price / product.list_price * 100 | round }}%</div>
{% else %}
<div class="price">${{ product.price | money }}</div>
{% endif %}
<a href="{{ product.url }}">Buy Now</a>
</li>
{% endfor %}
</ul>Everything within {{ and }} is processed by the template engine as a variable to be inserted into the page eg. {{ headline }}.
If a variable contains a deeper structure, like a dictionary, it can be accessed by dot syntax like so{{ product.price }}.
A value can also be a expression such as {{ 100 - product.price / product.list_price * 100}}.
<h1>{{ headline }}</h1>
<div class="price">{{ product.price }}</div>
<div class="list-price">{{ 100 - product.price / product.list_price * 100}}</div>Flow control if supported via if-else statements denoted by curly braces and percent signs: {% and %}.
{% if product.on_sale %}
On Sale
{% endif %}{% if product.stock_count < 10 %}
Only few in stock!
{% else %}
Lots in stock.
{% endif %}Iterating over an array of values is done as follows:
{% for product in products %}
{{ product.name }}
{% endfor %}To make looping over a loop easier each loop has an associated loop object only available within the loop body with the following fields:
loop.index
The index of the loop iteration starting from 0.
loop.length
The total length of the loop ie. number of elements in the list there is iterated over.
loop.first
true if this is the first iteration of the loop else false.
loop.last
true if this is the last iteration of the loop else false.
Here is an example of using the loop object to write a comma-separated list of sizes for each product.
{% for size in product.sizes %}
{{ size }}{% if not loop.last %}, {% endif %}
{% endfor %}Small, Medium, Large, X-LargeFilters can be used to format values before they are inserted into the page. Filters are applied to a value by using |.
{{ product.price | money }}Multiple filters can be used by being chained after each other. They will be applied in the order they are listed reading from left to right.
{{ product.price | round | money }}Clerk.js comes with these built-in filters:
round
Rounds to the nearest integer, like so {{ x | round }}.
pct
Gives you the percentage of two numbers, like so {{ x | pct y }}.
money
Formats a decimal number as currency using the US formatting rules.
Optional: The amount of decimals to be displayed can be altered by adding a number to the function. Usage: {{ price | money 2 }}
money_eu
Formats a decimal number as currency using the EU formatting rules.
Optional: The amount of decimals to be displayed can be altered by adding a number to the function. Usage: {{ price | money_eu 2 }}
nth
Returns a value from a list (x), based on the index given (y), like so {{ x | nth y }}
min
Returns the lowest value from a list
max
Returns the highest value from a list
You can add you own filter functions in the Clerk.js Configuration.
A filter function takes one or more arguments and returns a string or number. Here is an example of our round formatter:
Clerk('config', {
filters: {
round: function(x) {
return Math.round(x).toString();
}
});