In a jekyll website, I'm trying to use an include as a multi-purpose template by passing multiple variables; not always all of them, not always the same number of variables.
From the page, I want to do this:
{% include multi-purpose.html var1='foo' var2='ble' var3='yea' %}
When I do this in the include.html, and when var1 has a value, it works:
var1 is {{ include.var1 }}
In the include file I want to be able to discriminate which variables are assigned, by doing something like this:
{% if var1 != null %}
this is my var1 {{ include.var1 }}
{% endif %}
{% if var2 != null %}
this is my var2 {{ include.var2 }}
{% endif %}
{% if var3 != null %}
this is my var3 {{ include.var3 }}
{% endif %}
etc...
Unfortunately, my syntax is wrong, this code doesn't render the code inside the if statements.
I also tried this:
{% if var1 != '' %}
this is my var1 {{ include.var1 }}
{% endif %}
{% if var2 != '' %}
this is my var2 {{ include.var2 }}
{% endif %}
{% if var3 != '' %}
this is my var3 {{ include.var3 }}
{% endif %}
etc...
This one renders everything, regardless it is assigned or not.
To access the passed variables from inside the include, you need to prefix them with include.
Everywhere in the include!
Change this:
{% if var1 != null %}
to this:
{% if include.var1 != null %}
{% if var1 ... doesn't work because it checks for a "local" variable (declared inside the include) named var1 (which doesn't exist, of course).
As explained in Mitja's answer, you don't need to check for null or '', but you would still need to check {% if include.var1 %}, not {% if var1 %}!