# How to pass variables to html?
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**Category:** Help!\
**Created:** [February 18, 2021, 3:07am UTC](https://swi-prolog.discourse.group/t/how-to-pass-variables-to-html/3617 "2021-02-18T03:07:11Z")\
**Posts on this page:** 8\
**Page:** 1
I’m using: SWI-Prolog version 8.2.4
I have an html page and want to change navbar depending on the user’s role. I use `http_reply_file` and need to pass the role to html. What is the best way to do that?
P.S. I wouldn’t want to rewrite the code for `reply_html_page`.
---
I think it depends on ow you integrate the navbar into the page and how you decide on the user role. For the first, do you use the `reply_html_page/3` and the `Style` argument? There are so many ways to decide on the user and user role I hardly know what to ask …
If you can decide on the role from the HTTP request and/or authorization library, you can just write a predicate that does so and make the predicate that generates the part of the page that must be changed dependent on that.
---
I can get the role during the request, but my handler looks like:
```prolog
editor(Request) :-
http_reply_file('apps/src/editor.html', [], Request).
```
For example, I can do:
```prolog
navbar(_Request) :-
get_user_role(Role),
reply_html_page([], [some code]).
```
Although I wonder how to integrate `navbar` into `editor`?
---
You can integrate the content of a file into an otherwise Prolog generated page using
```prolog
include_html_file(File) -->
load_html(File, DOM, []),
html(DOM).
```
Next you can use `reply_html_page/3` to deal with the navbar. Note that you can use HTML quasi quotations to include verbatim HTML into the Prolog source and pass parameters to it.
Is that an option?
---
Sorry, but I didn’t get the idea. The extract above works fine. It generates the Prolog code from an html file.
My html file contents:
```prolog
My page
```
So `include_html_file` transforms the html code into Prolog. But how can I replace `