Module: QrcodeHelper

Defined in:
app/helpers/qrcode_helper.rb

Instance Method Summary collapse

Instance Method Details

#qrcode(data = '', options = {}) ⇒ Object 



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# File 'app/helpers/qrcode_helper.rb', line 2

def qrcode(data='', options = {})
  # Google API: https://google-developers.appspot.com/chart/infographics/docs/qr_codes
  width = pop_value :width, options, '200'
  output_encoding = pop_value :output_encoding, options
  error_correction_level = pop_value :error_correction_level, options
  margin = pop_value :margin, options

  qrcode_url = 'https://chart.googleapis.com/chart?cht=qr'
  qrcode_url += "&chl=#{data}"
  qrcode_url += "&chs=#{width}x#{width}"
  qrcode_url += "&choe=#{output_encoding}" unless output_encoding.nil?
  if error_correction_level.nil? or margin.nil?
    qrcode_url += "&chld=#{error_correction_level}" unless error_correction_level.nil?
    qrcode_url += "&chld=|#{margin}" unless margin.nil?
  else
    qrcode_url += "&chld=#{error_correction_level}|#{margin}"
  end
  image_tag qrcode_url, alt: data
end