how to change the viewport size in ruby

[perljuls]

// reports_controller.rb

def pdf
    pdf_html = ActionController::Base.new.render_to_string(template: 'reports/pdf.html.erb', layout: 'pdf' )

    pdf = Grover.new(pdf_html, {
      format: 'A4' //dynamic 
    }).to_pdf
end

//grover.rb

Grover.configure do |config|
  config.options = {
    emulate_media: 'screen',
    cache: false,
    print_background: true,
    prefer_css_page_size: true,
    # timeout: 0 # Timeout in ms. A value of `0` means 'no timeout'
  }
end

I tried pdf.setViewPort() but I think it is for page = ..browser something

[abrom]

Good question @perljuls

Unfortunately I haven't added that in just yet. It's available in the puppeteer API on the page object:
https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#pagesetviewportviewport

Interestingly, I was hitting up on the need to have that in place no more than 30 minutes ago! I'll likely look to add it in for the next release

[abrom]

FYI this has been added in #28

You can configure it either via the global configuration, in the Grover initialiser or if you're using the middleware, via meta options

I'll roll a release with this soon

[perljuls]

Thanks :)

[willkoehler]

Is it possible to set the viewport size with <meta> tags? Ex:

<meta name="grover-viewport-width" content=640>
<meta name="grover-viewport-height" content=480>

This doesn't work because 640 and 480 are converted to strings and puppeteer throws an error "Protocol error (Emulation.setDeviceMetricsOverride): Invalid parameters width: integer value expected; height: integer value expected"

[abrom]

Suggest create a new issue for this @willkoehler, but yes definitely possible. Something I'd already done for the scale attribute:

grover/lib/grover.rb

Line 310 in 7dc5056

options['scale'] = options['scale'].to_f

You're welcome to create a PR for it, otherwise I can take a look when I get some time.