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Contents
module ExpressTemplates
module Components
module Capabilities
# Adds the capability for a component to only render
# its markup when a condition to be evaluated in the
# view is true.
#
# Example:
#
# class PageHeader < ExpressTemplates::Components::Base
# include ExpressTemplates::Components::Capabilities::Conditionality
#
# emits {
# h1 { content_for(:page_header) }
# }
#
# only_if -> { content_for?(:page_header) }
#
# end
# end
#
# The condition supplied to only if in the form of a proc
# is evaluated in the view context.
#
# The component will render an empty string if the proc returns false.
module Conditionality
def self.included(base)
base.class_eval do
extend ClassMethods
end
end
module ClassMethods
def condition_proc
@condition_proc
end
def only_if condition_proc
@condition_proc = Proc.from_source "-> {!(#{condition_proc.source_body})}"
inner_src = self[:markup]
fragment_src = %Q(-> {
unless_block(Proc.from_source(#{@condition_proc.source.inspect})) {
#{inner_src.source_body}
}
})
_store :markup, Proc.from_source(fragment_src)
end
end
end
end
end
end
Version data entries
12 entries across 12 versions & 2 rubygems