hidden field value inside if block

is there a way to verify a hidden field value inside a if statement?

for example:

<input type="hidden" id="hdnDetails"/>
{% if details.id_details == hdnIdDetalii.value %}
  code here
{% endif %}

something like this...

note! i`m using python with google app engine, details is send from a .py file.
         the value of the hidden field is set in a javascript function when i click a button.
        
if i try to do this (the code above) i get the following error:

UndefinedError: 'hdnDetails' is undefined

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