RAILS - Generate PDF from HTML with GROVER

Question

I want to use GROVER to export same ERB/HTML pages from my application as PDF. It works, but the generated PDF seems to be missing the styles and formatting, no CSS seems to be processed.

Here my code within the controller:

 html_string = render_to_string(
  {
     template: 'users/show.html.erb',
     locals: { id: params[:id] }
  })

pdf = Grover.new(html_string, format: 'A4').to_pdf

respond_to do |format|
  format.html
  format.pdf do
    send_data(pdf, disposition: 'inline', filename: "Show_ID_#{params[:id]}", type: 'application/pdf')
  end
end

My question is, how I can persuade GROVER also to process the CSS files ?

Answer 1

I had the same problem where my layout was rendered without the CSS. I was able to resolve the issue by adding the display_url option in Grover.

In local development this would be for example:

pdf = Grover.new(html_string, format: 'A4', display_url: "http://localhost:3000").to_pdf

You need to change your display_url depending on your environment.

If this does not work, make sure the html_string that you are rendering actually includes the correct markup. You can render out the html_string as HTML to verify all markup is included.