Set value for hidden field

When value of hidden field in passed through URL, as show below:

https://podio.com/webforms/22087006/1547359?fields[code]=dell

The value is not getting set. 

Please have any one of the following:

OPTION 1::: Have the hidden field pre-filled based on the value passed in the URL and HIDE the field (do not show the hidden field to the end user)

OR

OPTION 2:::: Have the hidden field pre-filled based on the value passed in the URL and SHOW the field. However, in this case the field should be disabled for the end user and he should not be able to edit the value in that field.

˜Manish