openproject/app/views/watchers/set_watcher.js.erb

<%
@replace_selectors.each do |selector|
  next if selector.blank?
  options = { replace: @replace_selectors }

  last_selector = selector.split(' ').last
  if last_selector.starts_with? '.'
    options[:class] = last_selector[1..-1]
  elsif last_selector.starts_with? '#'
    options[:id] = last_selector[1..-1]
  end

  content = watcher_link(@watched, @user, options)
%>

jQuery("<%= selector %>").replaceWith("<%= escape_javascript(content) %>");

<% end %>