I am trying to set up an RSS feed for users that they can customise themselves.
At the minute, you can customise the feed by appending parameters to a URL eg http://example.com/feed?cat=-3&cat=-4&cat=-5 would exclude categories 3, 4, and 5 (cat is the hardcoded constant name).
Is there a way to give ten checkboxes a value so that when boxes 3, 4 and 5 are left UNCHECKED it appends the "&cat=-x" for the relevant boxes?
Presumably these would have to be appended upon the submit of the form. If all boxes are checked, then the http://www.example.com/feed URL would be submitted with no parameters added on.