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Contents
# frozen_string_literal: true
module Protoform
# Generates DOM IDs, names, etc. for a Field, Namespace, or Node based on
# norms that were established by Rails. These can be used outsidef or Rails in
# other Ruby web frameworks since it has now dependencies on Rails.
class DOM
def initialize(field:)
@field = field
end
# Converts the value of the field to a String, which is required to work
# with Phlex. Assumes that `Object#to_s` emits a format suitable for the web
# form.
def value
@field.value.to_s
end
# Walks from the current node to the parent node, grabs the names, and
# seperates them with a `_` for a DOM ID. One limitation of this approach is
# if multiple forms exist on the same page, the ID may be duplicate.
def id
lineage.map(&:key).join("_")
end
# The `name` attribute of a node, which is influenced by Rails (not sure
# where Rails got it from). All node names, except the parent node, are
# wrapped in a `[]` and collections are left empty. For example,
# `user[addresses][][street]` would be created for a form with data shaped
# like `{user: {addresses: [{street: "Sesame Street"}]}}`.
def name
root, *names = keys
names
.map { |name| "[#{name}]" }
.unshift(root)
.join
end
# Emit the id, name, and value in an HTML tag-ish that doesnt have an
# element.
def inspect
"<id=#{id.inspect} name=#{name.inspect} value=#{value.inspect}/>"
end
private
def keys
lineage.map do |node|
# If the parent of a field is a field, the name should be nil.
node.key unless node.parent.is_a? Field
end
end
# One-liner way of walking from the current node all the way up to the
# parent.
def lineage
Enumerator.produce(@field, &:parent).take_while(&:itself).reverse
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems