Generating dynamic CSS

Question

What is the best way to handle style that that is user-customized? Just as an example of the result I'm looking for, this would suffice:

body {
   color: {{ user.profile.text_color }};
}

However, serving CSS as a view seems like it would cause a significant amount of overhead in a file that is constantly requested, so this is probably not a good solution.

The user does not have access to the CSS files and we must assume that they have no web development knowledge.

Answer 1

Do the CSS dynamically via a view as normal, but use aggressive caching so that it loads quickly.

Answer 2

However, serving CSS as a view seems like it would cause a significant amount of overhead in a file that is constantly requested, so this is probably not a good solution.

And what if you would generate that CSS once?

1. Default CSS is: /common/css.css
2. Member customize CSS, now <link /> elements points to /user-specific/123.css?ts=123123123. 123 is of course an identifier of the member, and ts parameter contains a timestamp - a date of last CSS modification
3. Make sure that your CSS generator sets proper HTTP headers responsible for client-side caching
4. User browser request a CSS file - server replies whit simple 304 Not Modified header - there is no need for any script execution or contents download
5. When member modifies his CSS then you just update ts - once again just a single request is needed