def input_placeholder
      span    = content_tag :span, 'No items available', class: 'margin-bottom-1'
      icon    = content_tag :i, nil, class: 'mdi mdi-playlist-plus'
      clear   = content_tag :a, 'Clear', data: { clear: "#{input_html_id}-preview" }, class: 'button alert hollow margin-0'
      clear   = content_tag :div, clear, class: 'cell auto'