Clsx

Ruby utility for constructing HTML class strings conditionally with the provided syntax, you can define a module named Clsx that includes a method to handle each case: strings, objects (hashes), arrays, and a combination of these with nested structures. This method will recursively process each argument, filter out falsy values, and concatenate the truthy values into a single string.

Install the gem and add to the application's Gemfile by executing:

$ bundle add "clsx"

Strings (variadic)

  clsx("foo", true && "bar", "baz")
  #=> "foo bar baz"

Objects

  clsx({ foo:true, bar:false, baz:is_true? })
  #=> "foo baz"

Objects (variadic)

  clsx({ foo:true }, { bar:false }, null, { "--foobar":"hello" })
  #=> "foo --foobar"

Arrays

  clsx(["foo", 0, false, "bar"])
  #=> "foo bar"

Arrays (variadic)

  clsx(["foo"], ["", 0, false, "bar"], [["baz", [["hello"], "there"]]])
  #=> "foo bar baz hello there"

Kitchen sink (with nesting)

  clsx("foo", [1 && "bar", { baz:false, bat:null }, ["hello", ["world"]]], "cya")
  #=> "foo bar hello world cya"

You can also use clsx in Rails views like this:

  <div class="<%= clsx({ 'border': true, "border-t": false, "border-b":true }) %>">
    <!-- ... -->
  </div>

To use clsx in your Phlex components, include the helper module:

class MyComponent < Phlex::HTML
  include Clsx::Phlex::Helper

  def view_template
    div(class: clsx("base-class", { active: @active, disabled: @disabled })) do
      h1 { "Hello World" }
    end
  end
end

Or include it in your base component to make it available everywhere:

class ApplicationComponent < Phlex::HTML
  include Clsx::Phlex::Helper
end

class MyComponent < ApplicationComponent
  def view_template
    div(class: clsx("foo", { bar: true })) do
      # ...
    end
  end
end

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome. Just fork this repo make the changes you want and submit a pull request back to this repo :)

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the Clsx project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.