Set variable in jinja

I would like to know how can I set a variable with another variable in jinja. I will explain, I have got a submenu and I would like show which link is active. I tried this:

{% set active_link = {{recordtype}} -%} 

where recordtype is a variable given for my template.

4 Answers

{{ }} tells the template to print the value, this won't work in expressions like you're trying to do. Instead, use the {% set %} template tag and then assign the value the same way you would in normal python code.

{% set testing = 'it worked' %} {% set another = testing %} {{ another }} 

Result:

it worked 

Nice shorthand for Multiple variable assignments

{% set label_cls, field_cls = "col-md-7", "col-md-3" %} 

Just Set it up like this

{% set active_link = recordtype -%} 

You can do this with the set tag. See the official documentation.

For example,

{% set foo = "bar" %} {{ foo }} 

outputs

bar 

Note: there are scoping issues which means that variable values don’t persist between loop iterations, for example, if you want some output to be conditional on a comparison between previous and current loop values:

{# **DOES NOT WORK AS INTENDED** #} {% set prev = 0 %} {% for x in [1, 2, 3, 5] %} {%- if prev != x - 1 %}⋮ (prev was {{ prev }}) {% endif -%} {{ x }} {%- set prev = x %} {% endfor %} 

prints

1 ⋮ (prev was 0) 2 ⋮ (prev was 0) 3 ⋮ (prev was 0) 5 

because the variable isn’t persisted. Instead you can use a mutable namespace wrapper:

{% set ns = namespace(prev=0) %} {% for x in [1, 2, 3, 5] %} {%- if ns.prev != x - 1 %}⋮ (ns.prev was {{ ns.prev }}) {% endif -%} {{ x }} {%- set ns.prev = x %} {% endfor %} 

which prints

1 2 3 ⋮ (ns.prev was 3) 5 

as intended.