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Introduction

...

The following guide describes how to use Liquid within MailUp and which statements are supported.

 

When talking about dynamics fields, we refer to the MailUp Recipient fields.

...

OperatorMeaningWorkSyntax
==equals(tick)

This operator can be used with dynamic fields 'as is' only to compare strings.

Code Block
languagexml
{% if dynamicfields.name == 'alan' %} 
alan
{% elsif dynamicfields.name == 'tom' %}
tom
{% else %}
catherine
{% endif %}

In this case the check is case sensitive.

To compare numbers or data type different from string it is possible use the built in functions:

Code Block
languagexml
{% assign c1 = dynamicfields.name| evaltext: 'equalTo', 'Jennifer' %} {% if c1 == true %} Text {% endif %}
Code Block
languagexml
{% assign c1 = dynamicfields.age | evalinteger: 'equalTo', '8' %} {% if c1 == true %} Text {% endif %}
!=does not equal(tick)

It is possible use this operator with dynamic fields 'as is' only to compare strings.

Code Block
languagexml
{% if dynamicfields.name != 'alan' %} 
alan
{% elsif dynamicfields.name != 'tom' %}
tom
{% else %}
catherine
{% endif %}

In this case the check is case sensitive.

To compare numbers or data type different from string it is possible use the built in functions:

Code Block
languagexml
{% assign c1 = dynamicfields.name| evaltext: 'otherThan', 'Jennifer' %} {% if c1 == true %} Text {% endif %}
Code Block
languagexml
{% assign c1 = dynamicfields.age | evalinteger: 'otherThan', '8' %} {% if c1 == true %} Text {% endif %}
>greater than(tick)

It is possible use this operator with dynamic fields 'as is' only to compare strings.

Code Block
languagexml
{% if dynamicfields.name > 'alan' %} 
alan
{% elsif dynamicfields.name > 'tom' %}
tom
{% else %}
catherine
{% endif %}

In this case the check is case sensitive.

To compare numbers or data type different from string it is possible use the built in functions:

Code Block
languagexml
{% assign c1 = dynamicfields.name| evaltext: 'moreThan', 'Jennifer' %} {% if c1 == true %} Text {% endif %}
Code Block
languagexml
{% assign c1 = dynamicfields.age | evalinteger: 'moreThan', '8' %} {% if c1 == true %} Text {% endif %}
<less than(tick)

It is possible use this operator with dynamic fields 'as is' only to compare strings.

Code Block
languagexml
{% if dynamicfields.name < 'alan' %} 
alan
{% elsif dynamicfields.name < 'tom' %}
tom
{% else %}
catherine
{% endif %}

In this case the check is case sensitive.

To compare numbers or data type different from string it is possible use the built in functions:

Code Block
languagexml
{% assign c1 = dynamicfields.name| evaltext: 'lessThan', 'Jennifer' %} {% if c1 == true %} Text {% endif %}
Code Block
languagexml
{% assign c1 = dynamicfields.age | evalinteger: 'lessThan', '8' %} {% if c1 == true %} Text {% endif %}
>=greater than or equal to(tick)

It is possible use this operator with dynamic fields 'as is' only to compare strings.

Code Block
languagexml
{% if dynamicfields.name >= 'alan' %} 
alan
{% elsif dynamicfields.name >= 'tom' %}
tom
{% else %}
catherine
{% endif %}

In this case the check is case sensitive.

To compare numbers or data type different from string it is possible use the built in functions:

Code Block
languagexml
{% assign c1 = dynamicfields.name| evaltext: 'equalOrMoreThan', 'Jennifer' %} {% if c1 == true %} Text {% endif %}
Code Block
languagexml
{% assign c1 = dynamicfields.age | evalinteger: 'equalOrMoreThan', '8' %} {% if c1 == true %} Text {% endif %}
<=less than or equal to(tick)

It is possible use this operator with dynamic fields 'as is' only to compare strings.

Code Block
languagexml
{% if dynamicfields.name <= 'alan' %} 
alan
{% elsif dynamicfields.name <= 'tom' %}
tom
{% else %}
catherine
{% endif %}

In this case the check is case sensitive.

To compare numbers or data type different from string it is possible use the built in functions:

Code Block
languagexml
{% assign c1 = dynamicfields.name| evaltext: 'equalOrLessThan', 'Jennifer' %} {% if c1 == true %} Text {% endif %}
Code Block
languagexml
{% assign c1 = dynamicfields.age | evalinteger: 'equalOrLessThan', '8' %} {% if c1 == true %} Text {% endif %}
orlogical or(tick)
Code Block
languagexml
{% if dynamicfields.name == 'alan' or dynamicfields.age == 'child' %} 
is alan or a child
{% else %}
It is an adult alan or another adult
{% endif %}
andlogical and(tick)
Code Block
languagexml
{% if dynamicfields.name == 'alan' and dynamicfields.age == 'child' %} 
alan is a child
{% else %}
it is an adult
{% endif %}
containschecks for the presence of a substring inside a string(tick)
Code Block
languagexml
{% if dynamicfields.name contains 'oof' %} 
could be alan? 
{% else %} 
surely isn't alan 
{% endif %}

Types

TypeMeaningWorkSyntax
StringDeclare a string by wrapping a variable’s value in single quotes:(tick)
Code Block
languagexml
titleInput
{% assign thisIsAString = 'this is a string' %}
{{ thisIsAString | upcase }} 
Code Block
languagexml
titleOutput
THIS IS A STRING
NumberNumbers include floats and integers:(tick)
Code Block
languagexml
titleInput
{% assign thisIsAnInteger = 10 %}
{{ thisIsAnInteger | minus: 2 }} 
Code Block
languagexml
titleOutput
8

 

 

Code Block
languagexml
titleInput
{% assign thisIsAFloat = 10.234 %}
{{ thisIsAFloat  | minus: 2 }} 
Code Block
languagexml
titleOutput
8.23400020599365
Boolean (tick)
Code Block
languagexml
titleInput
{% assign thisIsTrue = true %}
{{ thisIsTrue }}
Code Block
languagexml
titleOutput
true

 

 

Code Block
languagexml
titleInput
{% assign thisIsFalse = true %}
{{ thisIsFalse }}
Code Block
languagexml
titleOutput
false
Nil

Nil is a special empty value that is returned when Liquid code has no results. It is not a string with the characters “nil”.

Nil is treated as false in the conditions of if blocks and other Liquid tags that check the truthfulness of a statement.

(tick)
Code Block
languagexml
titleInput
{% if user %}
  Hello user!
{% endif %}
Code Block
languagexml
titleOutput
 Hello user!

 

 

Code Block
languagexml
titleInput
{% unless user %}
  Hello user!
{% endunless %}
Code Block
languagexml
titleOutput
 Hello user!
ArrayArrays hold lists of variables of any type.(tick)
Code Block
languagexml
titleInput
{% assign my_array = 'alan,catherine,tom,erin,mark' | split: ',' %}
{{ my_array.first }}
{{ my_array.last }}
Code Block
languagexml
titleOutput
alan
mark

 

 

Code Block
languagexml
titleInput
{% assign my_array = 'alan,catherine,tom,erin,mark' | split: ',' %}
{% for user in my_array %}
 {{ user }}
{% endfor %}
Code Block
languagexml
titleOutput
alan catherine tom erin mark

 

 

Code Block
languagexml
titleInput
{% assign my_array = 'alan,catherine,tom,erin,mark' | split: ',' %}
{{ my_array[2] }}
Code Block
languagexml
titleOutput
tom

 

 

 

TAGS

Comment

OperatorMeaningWorkSyntax
commentAny text within the opening and closing comment blocks will not be output, and any Liquid code within will not be executed(tick)

  

Code Block
languagexml
titleInput
Text 1 {% comment %} Text 2 {% endcomment %}

 

Code Block
languagexml
titleOutput
Text 1

 

...

OperatorMeaningWorkSyntax
if

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

(tick)
Code Block
languagexml
titleInput
{% assign c1 = dynamicfields.age| evalinteger: 'equalTo', '10' %} 
{% if c1 == true %} 
10 years old 
{% endif %}
Code Block
languagexml
titleOutput
10 years old 

 

 

Code Block
languagexml
titleInput
{% if dynamicfields.name == 'alan' %} 
alan
{% endif %}
Code Block
languagexml
titleOutput
alan 
unlessExecutes a block of code only if a certain condition is not match(tick)
Code Block
titleInput
{% assign c1 = dynamicfields.age| evalinteger: 'equalTo', '10' %} 
{% unless c1 == true %} 
Not 10 years old
{% endunless %}
Code Block
languagexml
titleOutput
Not 10 years old

 

 

Code Block
languagexml
titleInput
{% unless dynamicfields.name == 'alan' %} 
alan
{% endunless %}
Code Block
languagexml
titleOutput
alan 
elsif/elseAdds more conditions within an if or unless block.(tick)
Code Block
languagexml
titleInput
{% if dynamicfields.name == 'alan' %} 
alan
{% elsif dynamicfields.name == 'tom' %}
tom
{% else %}
catherine
{% endif %}
Code Block
languagexml
titleoutput if name is goofy
alan
Code Block
languagexml
titleoutput if name is tom
tom
Code Block
languagexml
titleoutput for each other name
catherine
case/whenCreates a switch statement to compare a variable with different values(tick)
Code Block
titleInput
{% case dynamicfields.name%}
  {% when 'alan' %}
     This is a alan
  {% when 'tom' %}
     This is a tom
  {% else %}
     This is not a alan nor a tom. can it be a catherine?
{% endcase %} 
Code Block
languagexml
titleoutput if name is goofy
This is a alan
Code Block
languagexml
titleoutput if name is mickey
This is a tom
Code Block
languagexml
titleoutput for each other name
This is not a alan nor a tom. can it be a catherine?

...

OperatorMeaningWorkSyntax

for

Repeatedly executes a block of code.

(tick)
Code Block
languagexml
titleInput
{% assign my_array = 'alan,catherine,tom,erin,mark' | split: ',' %}
{% for user in my_array %}
 {{ user }}
{% endfor %}
Code Block
languagexml
titleOutput
alan catherine tom erin mark
break

Causes the loop to stop iterating when it encounters the break tag.

(tick)
Code Block
languagexml
titleInput
{% assign my_array = 'alan,catherine,tom,erin,mark' | split: ',' %}
{% for user in my_array %}
 {% if user == 'erin' %}
    {% break %}
  {% else %}
    {{ user }}
  {% endif %}
{% endfor %}
Code Block
languagexml
titleOutput
alan catherine tom
continue

Causes the loop to skip the current iteration when it encounters the continue tag.

(tick)
Code Block
languagexml
titleInput
{% assign my_array = 'alan,catherine,tom,erin,mark' | split: ',' %}
{% for user in my_array %}
 {% if user == 'erin' %}
    {% continue %}
  {% else %}
    {{ user }}
  {% endif %}
{% endfor %}
Code Block
languagexml
titleOutput
alan catherine tom mark
limitLimits the loop to the specified number of iterations.(tick)
Code Block
languagexml
titleInput
{% assign my_array = 'alan,catherine,tom,erin,mark' | split: ',' %}
{% for user in my_array limit:2 %}
 {{ user }}
{% endfor %}
Code Block
languagexml
titleOutput
alan catherine
offsetBegins the loop at the specified index.(tick)
Code Block
languagexml
titleInput
{% assign my_array = 'alan,catherine,tom,erin,mark' | split: ',' %}
{% for user in my_array offset:2 %}
 {{ user }}
{% endfor %}
Code Block
languagexml
titleOutput
tom erin mark

range

Defines a range of numbers to loop through. The range can be defined by both literal and variable numbers.(tick)
Code Block
languagexml
titleInput
{% for i in (3..5) %}
  {{ i }}
{% endfor %}
Code Block
languagexml
titleOutput
3 4 5

 

 

Code Block
languagexml
titleInput
{% assign num = 4 %}
{% for i in (1..num) %}
  {{ i }}
{% endfor %}
Code Block
languagexml
titleOutput
1 2 3 4
reversedReverses the order of the loop.(tick)
Code Block
languagexml
titleInput
{% assign my_array = 'alan,catherine,tom,erin,mark' | split: ',' %}
{% for user in my_array reversed %}
 {{ user }}
{% endfor %}
Code Block
languagexml
titleOutput
mark erin tom catherine alan 

...

OperatorMeaningWorkSyntax
assign

Creates a new variable

(tick)
Code Block
languagexml
titleInput
{% assign c1 = 10 %}
{% if c1 == 10 %} 
    It is ten!
{% endif %}
Code Block
languagexml
titleOutput
It is ten!

 

 

Code Block
languagexml
titleInput
{% assign c1 = 'alan' %}
{% if c1 == 'alan' %} 
   It is alan!
{% endif %}
Code Block
languagexml
titleOutput
It is alan!
captureCaptures the string inside of the opening and closing tags and assigns it to a variable. Variables created through {% capture %} are strings.(tick)
Code Block
languagexml
titleInput
{% assign name = dynamicfields.name %}
{% assign surname = dynamicfields.surname %}

{% capture about_me %}
I am {{ name }} {{ surname }} and my favorite food is pizza.
{% endcapture %}

{{ about_me }}
Code Block
languagexml
titleoutput
I am Catherine Martin and my favorite food is pizza.
incrementCreates a new number variable, and increases its value by one every time it is called. The initial value is 0.(error) 
decrementCreates a new number variable, and decreases its value by one every time it is called. The initial value is -1.(error) 

Filters

 

OperatorMeaningWorkSyntax
abs

Returns the absolute value of a number.

(error) 
append

Concatenates two strings and returns the concatenated value.

(tick)
Code Block
titleInput
{{ "Hello " | append: "Carl" }}
Code Block
titleOutput
Hello Carl

 

 

Code Block
titleInput
{{ "Welcome" | append: dynamicfields.name }}
Code Block
titleOutput
Welcome Luke 



Code Block
titleInput
{{ dynamicfields.name | append: " welcome!"}}
Code Block
titleOutput
Luke welcome!
at_least

Limits a number to a minimum value.

(error) 
at_most

Limits a number to a maximum value.

(error) 
capitalize

Makes the first character of a string capitalized.

(tick)
Code Block
titleInput
{{ "my great title" | capitalize }}
Code Block
titleOutput
My great title

 

 

Code Block
titleInput
{{ dynamicfields.nome | capitalize }}
Code Block
titleOutput
Luke
ceil

Rounds the input up to the nearest whole number. Liquid tries to convert the input to a number before the filter is applied.

(error) 
compact

Removes any nil values from an array.

  
concat

Concatenates (joins together) multiple arrays. The resulting array contains all the items from the input arrays.

(error) 
dateConverts a timestamp into another date format. The format for this syntax is the same as strftime. The input uses the same format as Ruby’s Time.parse.  
defaultAllows you to specify a fallback in case a value doesn’t exist. defaultwill show its value if the left side is nilfalse, or empty.(error) 
divided_by

Divides a number by the specified number.

(warning)

Does not work on dynamicfields.

 

Code Block
titleInput
{{ 16 | divided_by: 4 }}
Code Block
titleOutput
4

 

 

Code Block
titleInput
{{ subTotal| divided_by: 4 }}
Code Block
titleOutput
100
downcase

Makes each character in a string lowercase. It has no effect on strings which are already all lowercase.

(tick)
Code Block
titleInput
{{ "Parker Moore" | downcase }}
Code Block
titleOutput
parker moore

 

 

Code Block
titleInput
{{ dynamicfields.nome | downcase}}
Code Block
titleOutput
luke
escape

Escapes a string by replacing characters with escape sequences (so that the string can be used in a URL, for example). It doesn’t change strings that don’t have anything to escape.

(error) 
escape_once

Escapes a string without changing existing escaped entities. It doesn’t change strings that don’t have anything to escape.

(error) 
first

Returns the first item of an array.

 

Assuming the userid dynamicfield contains "1,2,3,4,5".

Code Block
titleInput
{% assign my_array = dynamicfields.userid | split: "," %}
{{ my_array.first }}
Code Block
titleOutput

 

 

Code Block
titleInput
{% assign my_array = "apples, oranges, peaches, plums" | split: ", " %}
{{ my_array.first }}
Code Block
titleOutput
apples
floor

Rounds a number down to the nearest whole number. Liquid tries to convert the input to a number before the filter is applied.

(error)

 

join

Combines the items in an array into a single string using the argument as a separator.

(tick)

Assuming the userid dynamicfield contains "1,2,3,4,5".

 

Code Block
titleInput
{% assign my_array = dynamicfields.userid | split: "," %}
{{ my_array | join: " and " }} 
Code Block
titleOutput
1 and 2 and 3 and 4 and 5

 

 

Code Block
titleInput
{% assign beatles = "John, Paul, George, Ringo" | split: ", " %}
{{ beatles | join: " and " }} 
Code Block
titleOutput
John and Paul and George and Ringo
last

Returns the last item of an array.

(tick)

Assuming the userid dynamicfield contains "1,2,3,4,5".

Code Block
titleInput
{% assign my_array = dynamicfields.userid | split: "," %}
{{ my_array.last}}
Code Block
titleOutput
5

 

 

Code Block
titleInput
{% assign my_array = "apples, oranges, peaches, plums" | split: ", " %}

{{ my_array.last }}
Code Block
titleOutput
plums
lstrip

Removes all whitespaces (tabs, spaces, and newlines) from the beginning of a string. The filter does not affect spaces between words.

(error) 
map

Creates an array of values by extracting the values of a named property from another object.

(tick)

Assuming the products contains:


Code Block
languagejava
{
	"products": [{
		"title": "Product 1",
		"price": 100
	}, {
		"title": "Product 2",
		"price": 200
	}, {
		"title": "Product 3",
		"price": 300
	}]
}


 

Code Block
titleInput
{% assign all_titles = products | map: "title" %}

{% for item in all_titles %}
{{ item }}
{% endfor %}
Code Block
titleOutput
Product 1
Product 2
Product 3
minus

Subtracts a number from another number.

(warning)

Does not work on dynamicfields.

Code Block
titleInput
{{ 4 | minus: 2 }}
Code Block
titleOutput
2

 

 

Code Block
titleInput
{{ SubTotal | minus: 100 }}
Code Block
titleOutput
900
modulo

Returns the remainder of a division operation.

(warning)

Does not work on dynamicfields.

 

Code Block
titleInput
{{ 3 | modulo: 2 }}
Code Block
titleOutput
1

 

 

Code Block
titleInput
{{ SubTotal | modulo: 6}}
Code Block
titleOutput
4
newline_to_br

Replaces every newline (\n) with an HTML line break (<br>).

(error) 
plus

Adds a number to another number.

(tick)

Assuming the TotalIncome dynamic field contains 500.

Code Block
titleInput
{{ dynamicfields.TotalIncome| plus: 2 }}
Code Block
titleOutput
502

 

 

Code Block
titleInput
{{ 5| plus: 2 }}
Code Block
7
prepend

Adds the specified string to the beginning of another string.

(tick)
Code Block
titleInput
{{ "apples, oranges, and bananas" | prepend: "Some fruit: " }}
Code Block
titleOutput
Some fruit: apples, oranges, and bananas

 

 

Code Block
titleInput
{{ dynamicfields.Name| prepend: "Hello " }}
Code Block
titleOutput
Hello Luke

 

 

 

Code Block
titleInput
{{ dynamicfields.Name| prepend: dynamicfields.Surname}}
Code Block
titleOutput
Luke Skywalker

 

 

 

Code Block
titleInput
{{ "Welcome" | prepend: dynamicfields.Name }}
Code Block
titleOutput
Welcome Luke
remove

Removes every occurrence of the specified substring from a string.

(tick)
Code Block
titleInput
{{ "I strained to see the train through the rain" | remove: "rain" }}
Code Block
titleOutput
I sted to see the t through the 

 

 

 

Code Block
titleInput
{{ dynamicfields.Name| remove: "uk"}}
Code Block
titleOutput
Le

 

 

Code Block
titleInput
{{"Luke Skywalker" | remove: dynamicfields.Name}}
Code Block
titleOutput
Skywalker
remove_first

Removes only the first occurrence of the specified substring from a string.

(tick)
Code Block
titleInput
{{ "I strained to see the train through the rain" | remove_first: "rain" }}
Code Block
titleOutput
I sted to see the train through the rain
replace

Replaces every occurrence of an argument in a string with the second argument.

(tick)
Code Block
titleInput
{{ "Take my protein pills and put my helmet on" | replace: "my", "your" }}
Code Block
titleOutput
Take your protein pills and put your helmet on



 

replace_first

Replaces only the first occurrence of the first argument in a string with the second argument.

(tick)
Code Block
titleInput
{% assign my_string = "Take my protein pills and put my helmet on" %}
{{ my_string | replace_first: "my", "your" }}
Code Block
titleOutput
Take your protein pills and put my helmet on
reverse

Reverses the order of the items in an array. reverse cannot reverse a string.

(error) 
round

Rounds an input number to the nearest integer or, if a number is specified as an argument, to that number of decimal places.

(tick)

Does not work on dynamicfields.


 

Code Block
titleInput
{{ 1.2 | round }}
Code Block
titleOutput
1
rstrip

Removes all whitespace (tabs, spaces, and newlines) from the right side of a string.

(error) 
size

Returns the number of characters in a string or the number of items in an array. size can also be used with dot notation (for example, {{ my_string.size }}). This allows you to use size inside tags such as conditionals.

(tick)
Code Block
{{ "Ground control to Major Tom." | size }}
Code Block
28

 

 

Code Block
titleInput
{% assign my_array = "apples, oranges, peaches, plums" | split: ", " %}

{{ my_array | size }}
Code Block
titleOutput
4
slice

Returns a substring of 1 character beginning at the index specified by the argument passed in. An optional second argument specifies the length of the substring to be returned.

String indices are numbered starting from 0.

(tick)
Code Block
titleInput
{{ "Liquid" | slice: 0 }}
Code Block
titleOutput
L

 

 

Assuming title contains "Return to the future"

Code Block
titleInput
{{title | slice: 0}}
Code Block
titleOutput
R

 

 

Code Block
titleInput
{{ dynamicfields.title| slice: 0 }}
Code Block
titleOutuput
R
sort

Sorts items in an array by a property of an item in the array. The order of the sorted array is case-sensitive.

(warning)

Same behaviour of the sort_natural filter.

 

Code Block
titleInput
{% assign my_array = "zebra, octopus, giraffe, Sally Snake" | split: ", " %}

{{ my_array | sort_natural | join: ", " }}
Code Block
titleOutput
giraffe, octopus, Sally Snake, zebra
sort_naturalSorts items in an array by a property of an item in the array.(error) 
splitDivides an input string into an array using the argument as a separator. split is commonly used to convert comma-separated items from a string to an array.(tick)
Code Block
titleInput
{% assign beatles = "John, Paul, George, Ringo" | split: ", " %}
{% for member in beatles %}
{{ member }}
{% endfor %}
Code Block
titleOutput
John

Paul

George

Ringo

 

Assuming the dynamic field albumid contains "1,2,3,4,5"

Code Block
titleInput
{% assign ids= dynamicfields.albumid | split: "," %}
{% for id in ids%}
{{ id }}
{% endfor %}
Code Block
titleOutput
1
2
3
4
5
strip

Removes all whitespace (tabs, spaces, and newlines) from both the left and right side of a string. It does not affect spaces between words.

(error) 
strip_html

Removes any HTML tags from a string.

(tick)
Code Block
titleInput
{{ "Have <em>you</em> read <strong>Ulysses</strong>?" | strip_html }}
Code Block
titleOutput
Have you read Ulysses?
strip_newlines

Removes any newline characters (line breaks) from a string.

(error) 
times

Multiplies a number by another number.

(warning)

Does not work on dynamicfields.

 

Code Block
titleInput
{{ 24 | times: 7 }}
Code Block
titleOutput
168
truncate

truncate shortens a string down to the number of characters passed as a parameter. If the number of characters specified is less than the length of the string, an ellipsis (…) is appended to the string and is included in the character count.

(tick)
Code Block
titleInput
{{ "Ground control to Major Tom." | truncate: 20 }}
Code Block
titleOutput
Ground control to...

 

 

Code Block
titleInput
{{ "Ground control to Major Tom." | truncate: 25, ", and so on" }}
Code Block
titleOutput
Ground control, and so on
truncatewords

Shortens a string down to the number of words passed as the argument. If the specified number of words is less than the number of words in the string, an ellipsis (…) is appended to the string.

(error) 
uniq

Removes any duplicate elements in an array.

(error) 
upcase

Makes each character in a string uppercase. It has no effect on strings which are already all uppercase.

(tick)
Code Block
titleInput
{{ dynamicfields.name | upcase }}

Code Block
titleOutput
LUKE
url_decode

Decodes a string that has been encoded as a URL or by url_encode.

(error) 
url_encode

Converts any URL-unsafe characters in a string into percent-encoded characters.

(error) 

...