Common mistakes – Emarsys ESL

mistake	explanation
Mixing old`$`or`%%`personalization within ESL	These variables do not mix. They are handled by two different services and Emarsys Marketing Platform will either print the placeholders in the email or cancel the email. On the same note, placeholders, variables, and scripting used in other platforms (SFMC, Shopify, Magento, etc.) will break ESL and cancel the email. You must remove each and every instance.
Using a single`=`instead of`==`	In general, you will only every use`=`for setting a variable and`==`to check a value or string.
Skipping a reference to the "global" object in JSON	If it some data is inside the “global” object, you must reference it in ESL. `{{event.ordertotal}}`instead of`{{event.global.ordertotal}}`is incorrect if inside of the "global" object
ESL/Twig is case sensitive	{{event.global.orderTotal}} is a different variable than {{event.global.ordertotal}}
With the exception of variables and values, you should exclusively use lowercase	Incorrect:`{% if contact.1111 == 'Family' AND contact.2222 == 'Other' %}` Incorrect:`{% IF contact.1111 == 'Family' and contact.2222 == 'Other' %}` Incorrect:`{% if CONTACT.1111 == 'Family' and CONTACT.2222 == 'Other' %}` Correct:`{% if contact.1111 == 'Family' and contact.2222 == 'Other' %}`
Inconsistent JSON structure	If you reference JSON via ESL without checking for the existence of it first, that variable must ALWAYS exist regardless of whether it is needed. If it is not in the JSON, that email will not be sent due to missing content.
Inconsistent JSON structure	Usually indicated by a large number of emails cancelled for "No Content"
Calling an undefined variable	Just because another system may reference order by`{{orders.lastorder.price}}`, does not mean ESL will. With the exception of custom variables and variables inside of an array that you are looping, you are limited to using variables that start with the following: `{{contact...}}` `{{event...}}` `{{rds...}}`
Adding unnecessary spaces, extra words, or omitting spaces in statements	{% end foreach %} instead of`{% endforeach %}` {% else if %} instead of`{% elseif %}` {% end if %} instead of`{% endif %}` {% endelseif %} instead of`{% endif %}` {%if contact.1111 == 'Family'%} instead of`{% if contact.1111 == 'Family' %}` This will not necessarily break functionality, but it will break syntax highlighters and can cause confusion.
Differences between`if`,`elseif`, and`else`	In an`if`statement, the only mandatory pieces are`{% if foo == 'bar' %}`and`{% endif %}`.`elseif`and`else`are always optional but useful. `if`is your opening condition. For every`if`, there must be a closing`endif`. It can be nested inside another`if`but both must eventually be closed. `elseif`is used exclusively for checking another condition after the previous one has failed. If you do not have a second condition to check, you should be using`else`.`{% elseif %}`is invalid. It should never be used without a preceding`if`and the preceding`if`must not be already closed with`endif`. `else`is your fallback. If none of the preceding conditions are true,`else`will be used instead. It is optional. If you do not want to set a fallback, you do not need to use`else`. The natural behavior of`if`is to not use a fallback.
Forgetting to use quotations when referencing a string	Strings are exact. In order to use them or check them, you must use single or double quotations surrounding them.
Using {{ and {% interchangeably	Incorrect:`{{ endif }}` Correct:`{% endif %}` Incorrect:`{% contact.1111 %}` Correct:`{{contact.1111}}` `{{...}}`should always be used to print variables from JSON, RDS, contact table, etc. `{%...%}` should always be used for statements or logic namely:`{% if... {% foreach... {% set...` When referencing a variable inside of a statement, you do not need`{{…}}`since you are not printing the variable Correct:`{% if contact.3 %}` Incorrect:`{% if {{contact.3}} %}`