In some cases you don’t want to use external SVG libraries like FontAwesome

Instead, you might want to use your own SVGs.

You can import SVGs into your apps’ assets folder:

<!-- app/assets/images/svg/search.svg -->
<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M15.828 14.871l-4.546-4.545a6.34 6.34 0 10-.941.942l4.545 4.545a.666.666 0 00.942-.942zm-9.461-3.525a4.995 4.995 0 114.994-4.994 5 5 0 01-4.994 4.994z" fill="#272727"/>
</svg>

BTW, usually when I import an SVG, I:

  • set fill to currentColor
  • width/height in em instead of px
  • remove style and class attributes
-fill="#FFFFFF"
+fill="currentColor"

-width="16px" height="16px"
+width="1em" height="1em"

The final SVG that is ready to be used in the app will look like this:

<!-- app/assets/images/svg/search2.svg -->
<svg width="1em" height="1em" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M15.828 14.871l-4.546-4.545a6.34 6.34 0 10-.941.942l4.545 4.545a.666.666 0 00.942-.942zm-9.461-3.525a4.995 4.995 0 114.994-4.994 5 5 0 01-4.994 4.994z" fill="currentColor"/>
</svg>

To display the SVG, you can try to use image_tag and render the SVG as an image:

<%= image_tag "svg/search.svg", style: "color: green; background-color: red; height: 50px; width: 20px;" %>
<%= image_tag "svg/search2.svg", style: "color: green; background-color: red; height: 50px; width: 20px;" %>
<%= image_tag "svg/search2.svg", style: "color: green; background-color: red; font-size: 40px;" %>

And here we see the problem: we can’t style the SVGs with CSS class & style:

svg-as-img

To overcome this issue, we can use a helper that will parse an SVG, add html options and render it in html:

# app/helpers/svg_helper.rb
module SvgHelper
  def svg_tag(icon_name, options={})
    file = File.read(Rails.root.join('app', 'assets', 'images', 'svg', "#{icon_name}.svg"))
    doc = Nokogiri::HTML::DocumentFragment.parse file
    svg = doc.at_css 'svg'

    options.each {|attr, value| svg[attr.to_s] = value}

    doc.to_html.html_safe
  end
end

<%= svg_tag 'search', style: "color: green; background-color: red; height: 50px; width: 20px;" %>
<%= svg_tag 'search2', style: "color: green; background-color: red; height: 50px; width: 20px;" %>
<%= svg_tag 'search2', style: "color: green; background-color: red; font-size: 40px;" %>

Now you see that the SVG was correctly rendered as an SVG in HTML:

svg-as-svg

Finally, instead of writing custom SVG helpers and “reinventing the wheel”, you can use an out-of-the-box solution: gem inline_svg

# terminal
bundle add inline_svg

<%= inline_svg_tag 'svg/search', style: "color: green; background-color: red; height: 50px; width: 20px;" %>
<%= inline_svg_tag 'svg/search2', style: "color: green; background-color: red; height: 50px; width: 20px;" %>
<%= inline_svg_tag 'svg/search2', style: "color: green; background-color: red; font-size: 40px;" %>

That’s it!

References: